CN103401561A - Methods and devices for compressing and decompressing map data - Google Patents
Methods and devices for compressing and decompressing map data Download PDFInfo
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Abstract
The invention provides methods and devices for compressing and decompressing map data. The method for compressing the map data comprises the following steps of extracting arrays from the map data; converting the extracted arrays into character strings; and converting n-ary integers in the converted character strings into N-ary characters, wherein high-ary characters are N characters in 91 characters of 95 characters with code values of 32 to 126 in an ASCII (American Standard Code for Information Interchange) code table besides characters of ',', '''', '\' and '-' and N is greater than n.
Description
Technical field
The present invention relates to field of data compression, more specifically, relate to a kind of for the device of Map Data Compression method and use the method and the method and apparatus that the map datum that uses this compression method compression is decompressed.
Background technology
Along with constantly popularizing of smart mobile phone, increasing people prefers to use the smart mobile phone online based on operating systems such as android or ios.While using browser and server end the transmission of data on smart mobile phone, often with JSON (JavaScript Object Notation) form, transmit.The JSON form is a kind of data interchange format of lightweight.It is based on JavaScript(Standard ECMA-2623rd Edition-December1999) a subset.JSON adopts the text formatting that is totally independent of language, but has also used the custom (comprising C, C++, C#, Java, JavaScript, Perl, Python etc.) that is similar to the C family of language.These characteristics make the JSON form become desirable exchanges data language, are easy to the people and read and write, and also are easy to machine simultaneously and resolve and generate.
In the relevant application of map, the map datum of JSON form is usually by array representation, for example: geoData:[1053,1553 ,-137,3 ,-110,54...] }.Here, geoData is an array, and it represents the coordinate x coordinate of a circuit and the string integer of y coordinate.Article one, circuit generally has several thousand coordinate points, and therefore, the length of geoData array can be very long, and this can cause in network transmission process, and the data quantitative change is large, period of reservation of number and traffic fee increase.Especially the array that contains 3 or 4 integral rings.This just causes the transmitted data on network amount large, and period of reservation of number is long, and customer flow takes increase.For instance, in the 2g network, download the data with 1000 coordinate points, the used time can surpass for 2 seconds, data is converted into figure again will surpasses for 3 seconds.As a rule, be that domestic consumer waits for maximum duration 3 seconds, surpassed this duration, and the user may will abandon this product.
Summary of the invention
The object of the present invention is to provide the Map Data Compression device of method and use the method for a kind of map datum for compression, the method and device are the data of character string forms with the data modification of array form, and adopt high system integer to replace low system integer, reduce the character amount of transmission, thereby reached the purpose of data compression.Finally make the user see that under same effect prerequisite, the data volume of download is minimum, stand-by period and the minimum purpose of cost flow.
According to an aspect of the present invention, provide a kind of method that map datum is compressed, having comprised: extract array from map datum; The array of extracting is converted to character string; N system integer in the character string of conversion is converted to N system character, wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
According to an aspect of the present invention, in 10 system integers with in character string are converted to the step of N system character, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
According to an aspect of the present invention, in the n system integer with in character string is converted to the step of N system character, with the integer sorting of n system, be that positive integer, negative integer and 0 are carried out respectively the system conversion.
According to a further aspect in the invention, provide a kind of device that map datum is compressed, having comprised: the array extraction unit, extract array from map datum; Array, to the character string converting unit, is converted to character string with the array of extracting; The system converting unit, n system integer in the character string of conversion is converted to N system character, wherein, the code value that described N system character is the ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
According to a further aspect in the invention, the system converting unit with the code value of ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order, and carry out the system conversion.
According to a further aspect in the invention, the system converting unit is that positive integer, negative integer and 0 are carried out respectively the system conversion with the integer sorting of n system.
According to a further aspect in the invention, provide a kind of method that the map datum of compression is decompressed, having comprised: extract string data from the map datum of compression; Be the character string that n-ary digit obtains n system integer according to this with the N system character conversion in character string; The character string of n-ary digit certificate is converted to array, wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
According to a further aspect in the invention, in the character string of the map datum that compresses, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters corresponding one by one in order as 0 to 90 integer of high system character and 10 hex value.
According to a further aspect in the invention, be in the step of the n-ary digit character string that obtains according to this n system integer in the N system character conversion with in character string, with the character in character string be divided into subtractive character, the character and zero with negative sign does not carry out the system conversion.
According to a further aspect in the invention, provide a kind of device that the map datum of compression is decompressed, having comprised: the character string extraction unit, extract string data from the map datum of compression; The system converting unit is the character string that n-ary digit obtains n system integer according to this with the N system character conversion in character string; Character string is to the array converting unit, the character string of n-ary digit certificate is converted to array, wherein, the code value that described N system character is the ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
According to a further aspect in the invention, in the character string of the map datum that compresses, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters corresponding one by one in order as 0 to 90 integer of high system character and 10 hex value.
According to a further aspect in the invention, the system converting unit is divided into the character in character string with subtractive character, with the character of negative sign and zero, does not carry out the system conversion.
According to a further aspect in the invention, provide a kind of transmission method of map datum, having comprised: the request of user end to server end sends map datum; Server end compresses map datum, and the map datum after compressing sends to client; Client decompresses to the map datum of compression, and the map datum map making after the use decompression, wherein, in the step of diagram data compressively, server extracts array from map datum, the array of extracting is converted to character string, and the n system integer in the character string that will change is converted to N system character, wherein, the code value that described high system character is the ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
According to a further aspect in the invention, a kind of transmission system of map datum is provided, comprise: client terminal device, send map datum to the server end request, reception is from the map datum of the compression of server, and the map datum map making that use decompresses after the map datum to compression decompresses; Server, map datum is compressed, and the map datum after compressing sends to client terminal device, and wherein, server extracts array from map datum, the array of extracting is converted to character string, and the n system integer in the character string that will change is converted to N system character, wherein, the code value that described N system character is the ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 91 characters in N character, N〉n.
Description of drawings
By the description of carrying out below in conjunction with accompanying drawing, above and other purpose of the present invention and characteristics will become apparent, wherein:
Fig. 1 illustrates for the allocation plan of transmission according to the system of the map datum of the JSON form of the compression of the embodiment of the present invention;
Fig. 2 is the flow chart that illustrates according to the compression method of the map datum that is used for the JSON form of the embodiment of the present invention;
Fig. 3 is the schematic diagram that illustrates according to the compression set of the map datum that is used for the JSON form of the embodiment of the present invention;
Fig. 4 is the flow chart that illustrates according to the decompression method of the map datum that is used for the JSON form of the embodiment of the present invention;
Fig. 5 illustrates the device schematic diagram that the map datum to the JSON form of the compression according to the embodiment of the present invention decompresses.
Embodiment
Below provide the description carried out with reference to accompanying drawing to help complete understanding such as claim and exemplary embodiment of the present invention that equivalent was limited thereof.Described description comprises various detailed details to help understanding, and these descriptions will be considered to only for exemplary.Therefore, those of ordinary skill in the art will recognize and can make without departing from the scope and spirit of the present invention various change described here and modification.In addition,, for clear and succinct, can omit the description to known function and structure.
In following explanation, map datum adopts the JSON form.Yet the JSON form is only an example, can adopt any suitable form to transmit map datum.
Shown in Fig. 1 is the allocation plan of system for the map datum of the JSON form of the compression of the transmission embodiment of the present invention.As shown in Figure 1, this system comprises mobile phone 100 as terminal equipment, with mobile phone 100, carries out base station 110 and the server 120 of radio communication.
Mobile phone 100 has the application program of the map datum that can use the JSON form, for example, and browser etc.When the HTTP of the transmission of the application program on mobile phone 100 request is transferred to server 120 by base station 110 and go-between, different from existing technology is, according to the server end 120 of the embodiment of the present invention, returns to the map datum of the JSON form after compression rather than directly returns to the map datum of JSON form.
The map datum of the JSON form after compression turns back to mobile phone 100 by network and base station 110, then mobile phone 100 map datum of resolving the JSON form after compression is with the map datum of the JSON form that obtains decompressing, and utilizes the map datum of the JSON form that decompresses to complete the drafting of map.
Below with reference to Fig. 2, flow chart according to the compression method of the map datum that is used for the JSON form of the embodiment of the present invention is described.
At first, at step S201, the array in the map datum of extraction JSON form.Because map datum mainly forms with the array of integer, usually be represented as [XX, XX, XX ... ] form, therefore, the numeral that can read in symbol [] extracts array.
Next, at step S203, the array of extracting is converted to character string.Here, can directly the bracket at array two ends " [] " be revised as quotation marks " " and can complete this conversion.
Next, at step S205, the n system integer in character string is converted to higher N system character, the N here one by one〉n.Can find out, the difference between N and n is larger, and the N system character that expression n system uses is fewer.
Below will with 10 system integers, (that is, n=10) for example, describe.But one skilled in the art will understand that the integer in character string can be also 8 systems, 16 systems etc.
According to embodiments of the invention, preferably choose code value in the ASCII character table and be in 95 characters of 32-126 remove "; ", " ＂ ", " " and "-" outside 91 characters represent 0 to 90 integer, thereby can be the character of 91 systems with the digital translation of 10 systems according to predetermined conversion regime.It should be understood that, also can select the character more than 10 wherein to be used as high system character, but selecting 91 characters is the preferred versions that have best effects, realize the compression ratio maximum.
Should be understood that and also can first carry out 10 system integers to the conversion of high system character and then carry out the conversion of array to character string.That is to say, the order of step S203 and S205 can be performed on the contrary.
Following table 1 shows 10 concrete system integers and the corresponding relation between 91 system characters.Can find out, in table 1 below, with ", ", " ＂ ", " " and ASCII character value corresponding to "-" be that 34,44,45,92 character is removed.
Table 1
, according to the 91 system tables of comparisons, the integer of 10 systems can be converted into 91 system characters.Similarly, when other n system integer is converted to as above 91 system character, equally can with and top mapping table set up similarly mapping relations between n system integer and 91 system characters.
10 system integers are converted to 91 system specific practices: with 91, divide exactly 10 system integers, can obtain quotient and the remainder, remove the business with 91 again, can obtain again quotient and the remainder, so carry out, until the business is 0 o'clock, then the low level significance bit of the remainder that first obtains as 91 system numbers, after the remainder that obtains as the high-order significance bit of 91 system numbers, be arranged in order.
Below will illustrate and how [1053,1553 ,-137,3 ,-110,54...] array will be converted into 91 system characters.Numeral in this array is divided into positive integer, negative integer and zero., for these 3 types of numerals, take 1053 ,-137,0 as representative, method for transformation is described respectively.
(1) positive integer: 1053
1053/91=11 Yus 52
11/91=0 Yus 11
By inquiring about the 91 system tables of comparisons, obtain the character corresponding with 11 and be ". ", the character corresponding with 52 is " W ", according to backward, arranges, 1053 are converted into 91 systems is " .W ".
(2) negative integer :-137
If at first negative removes negative sign, that is ,-137 become 137, and then according to the principle of positive integer, transform.
137/91=1 Yus 46
1/91=0 Yus 1
By inquiring about the 91 system tables of comparisons, the character corresponding with 1 be "! ", the character corresponding with 46 is " Q ", arrange according to backward, 137 be converted into 91 systems "! Q ", on the negative sign that again front is removed finally adds, finally become "! Q ".
(3) zero (0): this numerical value is directly inquired about the 91 system tables of comparisons and is got final product, and the character that inquiry draws 0 correspondence is " (space) ", namely space character.
By above-mentioned method for transformation, [1053,1553 ,-137,3 ,-110,54...] finally can be converted into character string " .W, 4' ,-! Q, $ ,-! 6, Y... ".Through the contraction in length of contrast after can finding to transform 7 characters.Therefore,, by above conversion, realized the compression to the map datum of JSON form.
Fig. 3 is the schematic diagram that illustrates according to the compression set 300 of the map datum that is used for the JSON form of the embodiment of the present invention.Compression set 300 can be arranged in server end, thereby when the request for the JSON formatted data that receives from client, can offer client after the Map Data Compression with the JSON form again.
As shown in Figure 3, compression set 300 comprises: array extraction unit 310, array are to character string converting unit 320 and system converting unit 330.Array extraction unit 310 is used for extracting from the map datum of JSON form the numeral of array form.Array is character string to character string converting unit 320 with the digital translation of array form, and then system converting unit 330 is converted to the n system integer in character string the N system character of high system one by one.Here, according to top example, system converting unit 330 can utilize the corresponding relation that shows in table 1 10 system integers to be converted to the character of 91 systems.
System converting unit 330 can be that positive integer, negative integer and zero are changed respectively with the digital sort of 10 systems., due to the top rule that specifically understands conversion, therefore will no longer describe.
Below with reference to Fig. 4, decompression method for the map datum of JSON form is described.
At first,, at step S401, read the character of the character string forms in the map datum of compression.Character string be typically expressed as " XX, XX, XX ... " form, therefore, can read the character in the character string that is included within symbol " ".
Next,, at step S403, with the character conversion in character string, be n system integer.Here, still adopt 91 above-mentioned systems to describe as example.
Below with " .W, 4' ,-! Q, $ ,-! 6, Y... " be example, the process that is translated into 10 system integer arrays is described.In above example, word string to be transformed is divided into 2 classes, and a class is that front has "-" number, and another kind of be not with "-" number below illustrates:
(1) be not with "-" sign character: " .W "
" .W " be totally 2 characters, need to transform character by character, and be then cumulative.By the 91 system tables of comparisons, getting 91 hex value corresponding with character ". " is 11, and 91 hex value corresponding with " W " are 52, just can calculate 10 hex value corresponding with " .W "=11*91^1+52*91^0=1053.
(2) band "-" sign character: "! Q”
At first incite somebody to action "! Q " negative sign removes, become "! Q ", then according to not being with "-" sign character rule to be translated into 10 systems.Be specially: with "! " corresponding 91 hex value are 1,91 hex value corresponding to " Q " are 46, can extrapolate with "! Q " corresponding 10 hex value=1*91^1+46*91^0=137, on the negative sign that again front is removed finally adds, that is :-137.
, if occur space (space) in character string, can directly be converted into 0.
Next, at step S405, the character string of 10 systems is converted to array, thereby can be applicable to map making.
Similarly, above step S403 and S405 also can be performed on the contrary.
Fig. 5 illustrates decompressing device 500 schematic diagrames that the map datum to the JSON form of the compression according to the embodiment of the present invention decompresses.
As shown in Figure 5, can be included in the terminal equipment of smart mobile phone for example according to the decompressing device 500 of the embodiment of the present invention.Decompressing device 500 comprises: character string extraction unit 510, system converting unit 520 and character string are to array converting unit 530.After receiving the character string that is comprised of character, system converting unit 520 is the numeric string that the numeral by the n system forms with the character conversion in character string.Then, character string is converted to the digital numeric string of n system to array converting unit 530 array of n system, thereby terminal equipment can utilize the digital array of n system to carry out map making.
The present invention can reduce the character amount of transmission, thereby reaches the purpose of data compression, therefore, the present invention can be so that the user sees that the data volume downloaded under same effect prerequisite still less, therefore, under same network condition, user's stand-by period and cost flow are still less.
The method according to this invention can be recorded in and comprise in the computer-readable medium of execution by the program command of computer implemented various operations.Medium also can include only program command or comprise the data file that combines with program command, data structure etc.The example of computer-readable medium comprises magnetizing mediums (for example hard disk, floppy disk and tape); Optical medium (for example CD-ROM and DVD); Magnet-optical medium (for example, CD); And special preparation is used for the hardware unit (for example, read-only memory (ROM), random access memory (RAM), flash memory etc.) of storage and execution of program instructions.Medium can be also the transmission medium (such as optical line or metal wire, waveguide etc.) that comprises the carrier wave of the signal that transmits established procedure instruction, data structure etc.The example of program command for example comprises can use the file of interpreter by the high-level code of computer execution by the machine code of compiler generation with comprising.
Although with reference to exemplary embodiment of the present invention, specifically shown and described the present invention, but it should be appreciated by those skilled in the art, in the situation that do not break away from the spirit and scope of the present invention that are defined by the claims, can carry out various changes on form and details to it.
Claims (18)
1. method that map datum is compressed comprises:
Extract array from map datum;
The array of extracting is converted to character string;
N system integer in the character string of conversion is converted to N system character,
Wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
2. the method for claim 1, wherein, in 10 system integers with in character string are converted to the step of high system character, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
3. the method for claim 1, in the n system integer with in character string is converted to the step of N system character, be that positive integer, negative integer and 0 are carried out respectively the system conversion with the integer sorting of n system.
4. device that map datum is compressed comprises:
The array extraction unit, extract array from map datum;
Array, to the character string converting unit, is converted to character string with the array of extracting;
The system converting unit, be converted to N system character with the n system integer in the character string of conversion,
Wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
5. device as claimed in claim 4, wherein, the system converting unit with the code value of ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order, and carry out the system conversion.
6. device as claimed in claim 4, system converting unit are that positive integer, negative integer and 0 are carried out respectively the system conversion with the integer sorting of n system.
7. method of decompressing of the map datum to compression comprises:
Extract string data from the map datum of compression;
Be the character string that n-ary digit obtains n system integer according to this with the N system character conversion in character string;
The character string of n-ary digit certificate is converted to array,
Wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
8. method as claimed in claim 7, wherein, in the character string of map datum of compression, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
9. method as claimed in claim 7, wherein, be in the step of the n-ary digit character string that obtains according to this n system integer in the N system character conversion with in character string, with the character in character string be divided into subtractive character, the character and zero with negative sign does not carry out the system conversion.
10. device of decompressing of the map datum to compression comprises:
The character string extraction unit, extract string data from the map datum of compression;
The system converting unit is the character string that n-ary digit obtains n system integer according to this with the N system character conversion in character string;
Character string, to the array converting unit, is converted to array with the character string of n-ary digit certificate,
Wherein, the code value that described N system character is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
11. device as claimed in claim 10, wherein, in the character string of the map datum that compresses, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
12. device as claimed in claim 10, wherein, the system converting unit is divided into the character in character string with subtractive character, with the character of negative sign and zero, does not carry out the system conversion.
13. the transmission method of a map datum comprises:
The request of user end to server end sends map datum;
Server end compresses map datum, and the map datum after compressing sends to client;
Client decompresses to the map datum of compression, and uses the map datum map making after decompressing,
Wherein, in the step of diagram data compressively, server extracts array from map datum, the array of extracting is converted to character string, and the n system integer in the character string that will change is converted to N system character, wherein, the code value that described N system character is the ASCII character table be remove "; " in 95 characters of 32 to 126, " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
14. method as claimed in claim 13, wherein, in 10 system integers with in character string are converted to the step of N system character, the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
15. method as claimed in claim 13, wherein, in the step that decompresses, client is extracted string data from the map datum of compression, with the N system character conversion in character string be 10 system data to obtain the character string of n system integer, and the character string of n-ary digit certificate is converted to array.
16. the transmission system of a map datum comprises:
Client terminal device, send map datum to the server end request, receives the map datum from the compression of server, and use the map datum map making that decompresses after the map datum to compression decompresses;
Server, compress map datum, and the map datum after compressing sends to client terminal device,
Wherein, server extracts array from map datum, the array of extracting is converted to character string, and the n system integer in the character string that will change is converted to N system character, wherein, the described N system character code value that is the ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 91 characters in N character, N〉n, n and N are the integers greater than 1.
17. system as claimed in claim 16, wherein, in conversion during system, server with the code value of ASCII character table be remove in 95 characters of 32 to 126 ", ", " ＂ ", " " and "-" outside 0 to 90 integer of 91 characters and 10 hex value corresponding one by one in order.
18. system as claimed in claim 16, wherein, client is extracted string data from the map datum of compression, be the character string that n-ary digit obtains n system integer according to this with the high system character conversion in character string, and the character string of n-ary digit certificate is converted to array.
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