CN108880659B - Beidou short message-based emergency map symbolization method - Google Patents
Beidou short message-based emergency map symbolization method Download PDFInfo
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Abstract
The invention relates to an emergency map symbolization method based on Beidou short messages, which comprises an emergency map publishing end and an emergency drawing terminal, wherein the emergency map publishing end is connected with the emergency drawing terminal; the emergency map publishing end identifies short messages used for emergency map symbolization, extracts map symbol description and display control style information required by emergency map symbolization and relevant to symbolization, text codes the short messages according to symbol description rules and display style coding rules, and sends coded data to a Beidou communication satellite through the Beidou short messages; the emergency mapping terminal receives the short message from the communication satellite, analyzes the short message based on the symbol description rule and the display style coding rule to obtain the symbolization information of the emergency map, and completes the symbolization of the emergency map and displays the emergency map on an emergency map layer of the emergency mapping terminal. According to the emergency map symbolization method, the Beidou short message is used as a carrier to transmit emergency map symbolized information, and emergency map symbolization is completed at a terminal so as to meet the display requirements of emergency events and resources under emergency conditions.
Description
Technical Field
The invention relates to the field of information technology processing, in particular to an emergency map symbolization method based on Beidou short messages.
Background
Map symbolization provides clear display expression for users by configuring symbols, notes, display styles and the like of map data. Map symbolization can be completed locally on map data, for example, in a map data symbolization method for realizing map library integration (application No. 201310176981.0), an electronic map drawing method based on basic geographic information data (application No. 201410059552.X), a batch symbolization rapid drawing method (application No. 201010266463.4), and a GIS-based emergency resource situation map generation system and method (application No. 201410709234.3), the symbolization result is transmitted to a client in a grid form for display, such as: a method for rapidly symbolizing and displaying vector data of types of mass space points of an electric GIS (geographic information System) (application number: 201410709234.3), a method and a system for displaying mass data of an online electronic map (application number: 201610110184.6), or a symbolization server receives source data to be symbolized to complete symbolization, and then the symbolization result is sent to a client, for example: a map symbolization network sharing service method based on DCOM technology (application number: 201110159210.1). The map source data transmission or the symbolic raster data result is difficult to be encapsulated by the Beidou short message under the emergency condition.
The short message communication is a navigation satellite communication function unique to a Beidou satellite system independently developed in China, and is suitable for two-way information transmission under emergency conditions such as mobile phone signal interruption and the like. Because the civil short message has the limit of 120 characters and the limit of 1 minute/piece of transmitting frequency, if the symbolized grid result or source map data is transmitted through the short message, the subpackaging problem needs to be considered, the timeliness is greatly reduced, and the requirement of emergency quick display cannot be met.
Disclosure of Invention
In view of this, the present invention provides an emergency map symbolization method based on the beidou short message, which simplifies the data transmission flow in the emergency map symbolization process based on the beidou short message by transmitting symbolized information through the short message, avoids the additional error code or packet loss defect, and improves the map symbolization efficiency under the emergency condition.
The invention is realized by adopting the following scheme: an emergency map symbolization method based on Beidou short messages comprises an emergency map publishing terminal and an emergency drawing terminal;
the emergency map publishing end identifies short messages used for emergency map symbolization, extracts map symbol description and display control style information related to symbolization required by emergency map symbolization, text codes are carried out on the short messages according to symbol description rules and display style coding rules, and the coded data are sent to a Beidou communication satellite through the Beidou short messages;
the emergency mapping terminal receives the short message from the communication satellite, analyzes the short message based on the symbol description rule and the display style coding rule to obtain symbolization information of the emergency map, and completes symbolization of the emergency map and display of the emergency map on an emergency map layer of the emergency mapping terminal.
Further, the short message comprises a short message type identification field, wherein the field is represented by a 1-bit letter O or S and occupies 1 byte; wherein, O represents a common text short message, and S represents an emergency map symbolized short message.
Further, the map symbol description and display control style information comprises an emergency symbol identification code, a symbol type, a symbol display control style, a note display style and symbolization auxiliary information; the map symbol description and the format of the display control style information are as follows:
{ an emergency symbol identification code; a symbol type; a symbol display control pattern; a note display style; symbolized side information }
Further, the symbol types are respectively points, lines and surfaces, and the symbol types are represented by 1-bit numbers 1, 2 or 3 and occupy 1 byte; wherein 1 is a point, 2 is a line, and 3 is a line;
the symbol display control style is respectively set for the types of point, line and surface symbols; the display control style of the point comprises a positioning code, a size, an offset, a color and a transparency; the display control style of the line comprises color, transparency and line width; the display control style of the face includes a contour-containing display style and a fill display style.
The note display style is respectively set for the types of point, line and surface symbols; the note display style of the point comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the line marking display style comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the face annotation display style comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing;
the symbolized auxiliary information is a key-value pair, and the format of the symbolized auxiliary information is as follows:
< variable name-value: formula, variable name is value: a formula, a. -. a.);
the formula adopts a C language expression to solve the problem of character compatibility of the short message;
the emergency symbol identification code is encoded by an emergency symbol in emergency geographic information graphic symbol (DB 35/T1566-2016), is represented by a 5-digit digital-letter combination, and occupies 5 bytes.
Further, in the display control style of the dots: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the size is a fixed value, the unit is millimeter, the value range is 0.1-99.9, 1 digit after the decimal point is accurate, 4 bytes are occupied, the size is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the identification is carried out through the variable name size, and the corresponding auxiliary information format is as follows: size field name: a formula for calculating a symbol size; the offset is an offset fixed value of the symbol from the point position along the direction of the symbol, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 bit after decimal point, and the offset occupies 3 bytes; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes;
in the online display control style: the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, 1 bit after the decimal point is accurately achieved, the line width occupies 3 bytes, the line width is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the line width is identified through the variable name wth, and the corresponding auxiliary information format is as follows: wth field name: a formula for calculating a line width;
in the display control style of the face: the format is [ contour line display style, filling display style ]; the contour line display pattern comprises color, transparency and line width, wherein the color adopts an RGB color mode, values are taken according to 256 levels and account for 9 bytes, the transparency takes the percentage as a unit, the values are 0-100 and 3 bytes, the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, the accuracy is 1 bit after decimal point, and the value range accounts for 3 bytes; the filling display pattern comprises a single-color filling display pattern, a gradient filling display pattern, a pattern filling display pattern, a texture filling display pattern, a point symbol filling display pattern and a line symbol filling display pattern which are respectively represented by 1-6 and occupy 1 byte.
Furthermore, the single-color filling display style adopts the color of the symbol, the transparency of the single-color filling display style is in% unit, the value is 0-100, and the single-color filling display style accounts for 3 bytes; the gradient filling display style adopts the gradient of the symbol, the transparency of the gradient filling display style takes the value of 0 to 100 in percent as a unit and occupies 3 bytes; the pattern filling display style adopts the self pattern of the symbol, the transparency of the pattern is in percent, the value is 0-100, and the pattern occupies 3 bytes; the texture filling display style adopts the self pattern of the symbol, the transparency of the texture filling display style takes% as a unit, the value is 0-100, and the texture filling display style occupies 3 bytes; the dot symbol filling display pattern comprises a dot symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: psc ═ field name: the formula is used for calculating the proportion of the variable spacing, and the transparency takes% as a unit, takes the value of 0-100 and occupies 3 bytes; the line symbol filling display pattern comprises a line symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: lsc — field name: and the formula is used for calculating the proportion of the variable spacing, and the transparency takes% as a unit, takes 0-100 and occupies 3 bytes.
Further, in the dot notation display style: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the offset is an offset fixed value of the mark from a point position along the direction of the mark, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, and the offset occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, the value range is 0.1-99.9, and the word spacing occupies 5 bytes;
in the online annotation display style: the positioning code takes the drawing direction of a line as a reference, the left side is 1, the right side is 2, and 1 byte is occupied; the offset is an offset fixed value of the mark from the vertical direction of the line along the direction of the mark, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, and the offset occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, and the value range is 0.1-99.9 and occupies 5 bytes;
in the face notation display style: the positioning code comprises a face gravity center mark, a face contour mark and a random distribution in the face, the values are respectively 1, 2 and 3, and the positioning code occupies 1 byte; the offset is an offset fixed value of the note pointing from the center of the surface or the vertical direction of the contour line along the note, no offset value is randomly distributed, the unit is millimeter, the value range is 0.1-9.9, the accuracy is 1 digit after a decimal point, the offset value is 000 in random distribution, and the offset occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100, and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, and the value range of 0.1-99.9 accounts for 5 bytes.
Further, the text encoding of the short message according to the symbol description rule and the display style encoding rule specifically includes: and identifying the type identification field of the short message, if the field displays that the short message is the emergency map symbolized short message, obtaining map symbol description and display control style information, and sequentially splicing according to the map symbol description and display control style information to obtain a numeric letter string.
Further, the emergency map symbolization in the emergency mapping terminal specifically includes: and symbolizing the element layer to be symbolized, extracting an emergency drawing symbol from a symbol library of the emergency drawing terminal, drawing according to the symbol display control pattern, extracting the note field information, and completing the note according to the note display pattern.
Furthermore, the emergency map issuing end is provided with a Beidou communication module for converting the coded data into a Beidou short message and sending the Beidou short message to a Beidou communication satellite.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the Beidou short message function of the Beidou communication satellite is utilized to realize the transmission of the symbolized information of the emergency map, and the Beidou communication satellite is utilized to transmit the symbolized information of the emergency map, so that the problem that the map source data transmission or symbolized raster data result is difficult to be encapsulated and transmitted through the Beidou short message under the emergency condition is solved, the data transmission flow in the symbolization process of the emergency map based on the Beidou short message is simplified, the defect of extra error codes or packet loss is avoided, and the symbolization efficiency of the underground map under the emergency condition is improved.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the embodiment provides an emergency map symbolization method based on a beidou short message, which includes an emergency map publishing terminal and an emergency mapping terminal;
the emergency map publishing end identifies short messages used for emergency map symbolization, extracts map symbol description and display control style information related to symbolization required by emergency map symbolization, text codes are carried out on the short messages according to symbol description rules and display style coding rules, and the coded data are sent to a Beidou communication satellite through the Beidou short messages;
the emergency mapping terminal receives the short message from the communication satellite, analyzes the short message based on the symbol description rule and the display style coding rule to obtain symbolization information of the emergency map, and completes symbolization of the emergency map and display of the emergency map on an emergency map layer of the emergency mapping terminal.
In this embodiment, the short message includes a short message type identifier field, which is represented by a 1-bit letter O or S and occupies 1 byte; wherein, O represents a common text short message, and S represents an emergency map symbolized short message.
In this embodiment, the map symbol description and display control style information includes emergency symbol identification code, symbol type, symbol display control style, annotation display style, and symbolized auxiliary information; the map symbol description and the format of the display control style information are as follows:
{ an emergency symbol identification code; a symbol type; a symbol display control pattern; a note display style; symbolized side information }
In this embodiment, the symbol types are respectively a point, a line, and a plane, and the symbol types are represented by 1-bit numbers 1, 2, or 3, and occupy 1 byte; wherein 1 is a point, 2 is a line, and 3 is a line;
the symbol display control style is respectively set for the types of point, line and surface symbols; the display control style of the point comprises a positioning code, a size, an offset, a color and a transparency; the display control style of the line comprises color, transparency and line width; the display control style of the face includes a contour-containing display style and a fill display style.
The note display style is respectively set for the types of point, line and surface symbols; the note display style of the point comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the line marking display style comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the face mark display style comprises a positioning code, an offset, a font size, a color, a font shape, transparency, an angle and a character spacing;
the symbolized auxiliary information is a key-value pair, and the format of the symbolized auxiliary information is as follows:
< variable name-value: formula, variable name ═ value: a formula, a. -. a.);
the formula adopts a C language expression to solve the problem of character compatibility of the short message;
the emergency symbol identification code is encoded by an emergency symbol in emergency geographic information graphic symbol (DB 35/T1566-2016), is represented by a 5-digit digital-letter combination, and occupies 5 bytes.
In the present embodiment, in the display control pattern of dots: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the size is a fixed value, the unit is millimeter, the value range is 0.1-99.9, 1 digit after the decimal point is accurate, 4 bytes are occupied, the size is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the identification is carried out through the variable name size, and the corresponding auxiliary information format is as follows: size ═ field name: a formula for calculating a symbol size; the offset is an offset fixed value of the symbol from the point position along the direction of the symbol, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 bit after decimal point, and the offset occupies 3 bytes; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes;
in the online display control style: the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, 1 bit after the decimal point is accurately achieved, the line width occupies 3 bytes, the line width is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the line width is identified through the variable name wth, and the corresponding auxiliary information format is as follows: wth field name: a formula for calculating a line width;
in the display control style of the face: the format is [ contour line display style, filling display style ]; the contour line display pattern comprises color, transparency and line width, wherein the color adopts an RGB color mode, values are taken according to 256 levels and account for 9 bytes, the transparency takes the percentage as a unit, the values are 0-100 and 3 bytes, the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, the accuracy is 1 bit after decimal point, and the value range accounts for 3 bytes; the filling display style comprises a single-color filling display style, a gradual change filling display style, a pattern filling display style, a texture filling display style, a point symbol filling display style and a line symbol filling display style which are respectively represented by 1-6 and occupy 1 byte.
In this embodiment, the monochrome filling display pattern adopts the color of a symbol itself, and the transparency thereof takes a value of 0 to 100 in% as a unit, and occupies 3 bytes; the gradient filling display style adopts the gradient of the symbol, the transparency of the gradient filling display style takes the value of 0 to 100 in percent as a unit and occupies 3 bytes; the pattern filling display style adopts the self pattern of the symbol, the transparency of the pattern is in percent, the value is 0-100, and the pattern occupies 3 bytes; the texture filling display style adopts the self pattern of the symbol, the transparency of the texture filling display style takes% as a unit, the value is 0-100, and the texture filling display style occupies 3 bytes; the dot symbol filling display pattern comprises a dot symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: psc field name: the formula is used for calculating the proportion of the distance between the variables, and the transparency takes the percentage as a unit, takes the value of 0-100 and accounts for 3 bytes; the line symbol filling display pattern comprises a line symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: lsc — field name: and the formula is used for calculating the proportion of the variable spacing, and the transparency takes% as a unit, takes 0-100 and occupies 3 bytes.
In the present embodiment, in the annotation display style of dots: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the offset is an offset fixed value of the mark from a point position along the direction of the mark, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, and the offset occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, the value range is 0.1-99.9, and the word spacing occupies 5 bytes;
in the online annotation display style: the positioning code takes the drawing direction of a line as a reference, the left side is 1, the right side is 2, and 1 byte is occupied; the offset is an offset fixed value of the mark from the vertical direction of the line along the direction of the mark, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, and the offset occupies 3 bytes; the font is identified by a variable name font, and the format of the corresponding auxiliary information is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, and the value range is 0.1-99.9 and occupies 5 bytes;
in the face notation display style: the positioning code comprises a face gravity center mark, a face contour mark and a random distribution in the face, the values are respectively 1, 2 and 3, and the positioning code occupies 1 byte; the offset is an offset fixed value pointed by the mark from the center of the surface or the vertical direction of the contour line, no offset value is randomly distributed, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, the offset value is 000 and occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, and the value range of 0.1-99.9 accounts for 5 bytes.
In this embodiment, the text encoding of the short message according to the symbol description rule and the display style encoding rule specifically includes: and identifying the type identification field of the short message, if the field displays that the short message is the emergency map symbolized short message, obtaining map symbol description and display control style information, and sequentially splicing according to the map symbol description and display control style information to obtain a numeric letter string.
In this embodiment, the emergency map symbolization in the emergency mapping terminal specifically includes: and symbolizing the element layer to be symbolized, extracting an emergency drawing symbol from a symbol library of the emergency drawing terminal, drawing according to the symbol display control pattern, extracting the note field information, and completing the note according to the note display pattern.
In this embodiment, the emergency map issuing end is provided with a Beidou communication module for converting the coded data into a Beidou short message and sending the Beidou short message to a Beidou communication satellite.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (7)
1. An emergency map symbolization method based on Beidou short messages is characterized by comprising the following steps: the emergency map making system comprises an emergency map issuing end and an emergency drawing terminal;
the emergency map publishing end identifies short messages used for emergency map symbolization, extracts map symbol description and display control style information related to symbolization required by emergency map symbolization, text codes are carried out on the short messages according to symbol description rules and display style coding rules, and the coded data are sent to a Beidou communication satellite through the Beidou short messages;
the emergency mapping terminal receives the short message from the communication satellite, analyzes the short message based on the symbol description rule and the display style coding rule to obtain symbolization information of the emergency map, and completes symbolization and display of the emergency map on an emergency map layer of the emergency mapping terminal;
the map symbol description and display control style information comprises an emergency symbol identification code, a symbol type, a symbol display control style, a note display style and symbolization auxiliary information; the map symbol description and the display control style information have the following formats:
the symbol types are respectively points, lines and surfaces, are represented by 1-bit numbers 1, 2 or 3 and occupy 1 byte; wherein 1 is a point, 2 is a line, and 3 is a line;
the symbol display control style is respectively set for the types of point, line and surface symbols; the display control style of the point comprises a positioning code, a size, an offset, a color and a transparency; the display control style of the line comprises color, transparency and line width; the display control style of the surface comprises a contour line-containing display style and a filling display style;
the note display style is respectively set for the types of point, line and surface symbols; the note display style of the point comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the line marking display style comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing; the face annotation display style comprises a positioning code, an offset, a font size, a color, a font style, a transparency, an angle and a character spacing;
the symbolized auxiliary information is a key-value pair, and the format of the symbolized auxiliary information is as follows:
the formula adopts a C language expression to solve the problem of character compatibility of the short message;
wherein, in the display control style of the dots: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the size is a fixed value, the unit is millimeter, the value range is 0.1-99.9, 1 digit after the decimal point is accurate, 4 bytes are occupied, the size is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the identification is carried out through the variable name size, and the corresponding auxiliary information format is as follows: size = field name: a formula for calculating a symbol size; the offset is an offset fixed value of the symbol from the point position along the direction of the symbol, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 bit after decimal point, and the offset occupies 3 bytes; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100, and accounts for 3 bytes;
in the online display control style: the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, 1 bit after the decimal point is accurately achieved, the line width occupies 3 bytes, the line width is defined in the auxiliary information through the layer attribute field, the unit is millimeter, the line width is identified through the variable name wth, and the corresponding auxiliary information format is as follows: wth = field name: a formula for calculating a line width;
in the display control style of the face: in the format of
(ii) a The contour line display pattern comprises color, transparency and line width, wherein the color adopts an RGB color mode, is taken as a value according to 256 color levels and accounts for 9 bytes, the transparency takes 0-100 in% as a unit and accounts for 3 bytes, the line width is a fixed value, the unit is millimeter, the value range is 0.1-9.9, and the contour line is accurate to 1 bit after decimal point and accounts for 3 bytes; the filling display pattern comprises a single-color filling display pattern, a gradient filling display pattern, a pattern filling display pattern, a texture filling display pattern, a point symbol filling display pattern and a line symbol filling display pattern which are respectively represented by 1-6 and occupy 1 byte.
2. The emergency map symbolization method based on the Beidou short message according to claim 1, characterized by comprising the following steps: the short message comprises a short message type identification field, wherein the field is represented by a 1-bit letter O or S and occupies 1 byte; wherein, O represents a common text short message, and S represents an emergency map symbolized short message.
3. The emergency map symbolization method based on the Beidou short message according to claim 1, characterized by comprising the following steps: the single-color filling display pattern adopts the color of a symbol, the transparency of the single-color filling display pattern is in% unit, the value is 0-100, and the single-color filling display pattern accounts for 3 bytes; the gradient filling display style adopts the gradient of the symbol, the transparency of the gradient filling display style takes the value of 0 to 100 in percent as a unit and occupies 3 bytes; the pattern filling display style adopts the self pattern of the symbol, the transparency of the pattern is in percent, the value is 0-100, and the pattern occupies 3 bytes; the texture filling display style adopts the self pattern of the symbol, the transparency of the texture filling display style takes% as a unit, the value is 0-100, and the texture filling display style occupies 3 bytes; the dot symbol filling display pattern comprises a dot symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: psc = field name: the formula is used for calculating the proportion of the distance between the variables, and the transparency takes the percentage as a unit, takes the value of 0-100 and accounts for 3 bytes; the line symbol filling display pattern comprises a line symbol interval proportion and transparency, wherein the interval proportion comprises a constant interval proportion and a variable interval proportion, the value range of the constant interval proportion is 0.1-9.9, the constant interval proportion occupies 3 bytes, the variable interval proportion is identified through a variable name psc, and the corresponding auxiliary information format is as follows: lsc = field name: and the formula is used for calculating the proportion of the variable spacing, and the transparency takes% as a unit, takes 0-100 and occupies 3 bytes.
4. The emergency map symbolization method based on the Beidou short message according to claim 1, characterized by comprising the following steps:
in the punctuation display style of dots: the positioning code takes a point position as a positioning point, takes north as an initial value, takes 0-360 degrees as an integer angle rotated in the clockwise direction, and occupies 3 bytes; the offset is an offset fixed value of the note pointing from a point position along the note, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 bit after a decimal point and occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font = font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, the value range is 0.1-99.9, and the word spacing occupies 5 bytes;
in the online annotation display style: the positioning code takes the drawing direction of a line as a reference, the left side is 1, the right side is 2, and 1 byte is occupied; the offset is an offset fixed value of the mark from the vertical direction of the line along the direction of the mark, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, and the offset occupies 3 bytes; the font is identified by a variable name font, and the corresponding auxiliary information format is as follows: font = font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes;
in the face notation display style: the positioning code comprises a face gravity center mark, a face contour mark and a random distribution in the face, the values are respectively 1, 2 and 3, and the positioning code occupies 1 byte; the offset is an offset fixed value pointed by the mark from the center of the surface or the vertical direction of the contour line, no offset value is randomly distributed, the unit is millimeter, the value range is 0.1-9.9, the offset is accurate to 1 digit after decimal point, the offset value is 000 and occupies 3 bytes; the font is identified by a variable name font, and the format of the corresponding auxiliary information is as follows: font = font name; the numeric value range is 5-72, and the numeric value occupies 2 bytes; the font has five font types of thickening, inclining, underlining, stretching by 25 percent and flattening by 25 percent, which are respectively represented by 32-system numeric letters, namely 1, 2, 4, 8 and G, 0 represents the convention, and the font value is the sum of values of five different font types and occupies 1 byte; the color adopts an RGB color mode, and takes values according to 256 color levels, and occupies 9 bytes; the transparency takes% as a unit, takes a value of 0-100 and accounts for 3 bytes; the angle is the rotation angle of the character, the positive north is taken as an initial value, and the integral angle rotated along the clockwise direction takes 0-360 degrees and occupies 3 bytes; the unit of word spacing is millimeter, and the value range of 0.1-99.9 accounts for 5 bytes.
5. The emergency map symbolization method based on the Beidou short message according to claim 2, characterized in that: the text coding of the short message according to the symbol description rule and the display style coding rule specifically comprises the following steps: and identifying the type identification field of the short message, if the field displays that the short message is the emergency map symbolized short message, obtaining map symbol description and display control style information, and sequentially splicing according to the map symbol description and display control style information to obtain a numeric letter string.
6. The emergency map symbolization method based on the Beidou short message according to claim 1, characterized by comprising the following steps: the emergency map symbolization in the emergency mapping terminal specifically comprises the following steps: and symbolizing the element layer to be symbolized, extracting an emergency drawing symbol from a symbol library of the emergency drawing terminal, drawing according to the symbol display control pattern, extracting the note field information, and completing the note according to the note display pattern.
7. The emergency map symbolization method based on the Beidou short message according to claim 1, characterized by comprising the following steps: the emergency map issuing end is provided with a Beidou communication module used for converting the coded data into Beidou short messages and sending the Beidou short messages to a Beidou communication satellite.
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