CN116718199A - Route track display method crossing east-west longitude by 180 degrees - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
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Abstract
The application discloses a route track display method crossing an east-west longitude by 180 degrees, which comprises the following steps: acquiring longitude and latitude of a track point on a route; judging whether the route track spans 180 degrees of east-west longitude or not according to the acquired longitude of the track point on the route by utilizing a first rule; and displaying the route track according to the second rule according to the judging result. The application can accurately judge whether the ship route track spans 180 degrees of east-west longitude and correctly display, and provides effective technical support for ship navigation management.
Description
Technical Field
The application belongs to the field of route display, and particularly relates to a route track display method crossing east-west longitude 180 degrees.
Background
The primary meridian, also known as greenwich meridian or greenish meridian, is a meridian located in the greenish astronomical table in the united kingdom. Longitude and latitude define the primary meridian as 0 degrees, the east longitude and the west longitude are respectively defined on the east and west meridians, the east longitude increases to the east through the primary meridian, and the maximum position is 180 degrees; the west decreases through this initial meridian to the west, with a minimum of-180 °, and 180 ° and-180 ° are actually geographically coincident, referred to as the east-west meridian 180 °.
Thus, if the ship's course in navigation crosses 180 ° from east-west, for example, its coordinate point navigates from (178 °,32 °) to (-179 °,34 °) across east-west, 180 ° meridian, since the earth is spherical and 180 ° and-180 ° are virtually coincident geographically, the computer will understand that the ship's course in longitude decreases from 178 ° to 0 ° and then decreases to-179 °, and the latitude increases from 32 ° to 34 °, the ship's course in longitude is displayed as going through the 0 ° primary meridian from the coordinate point (178 °,32 °) to west, then reaching the coordinate point (-179 °,34 °), encircling the earth for one week. Therefore, abnormal display of the ship route track can be caused, and trouble is brought to the management work of the ship.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a route track display method crossing the east-west longitude by 180 degrees, and a first rule is utilized to judge whether the route track crosses the east-west longitude by 180 degrees; and according to the judgment result, displaying the route tracks in different modes according to a second rule, so that the route tracks crossing the east-west longitude by 180 degrees can be correctly displayed.
To achieve the above object, an embodiment of the present application provides a route track display method crossing 180 ° east-west longitude, comprising:
acquiring longitude and latitude of a track point on a route; judging whether the route track spans 180 degrees of east-west longitude or not according to the acquired longitude of the track point by utilizing a first rule; and displaying the route track according to a second rule according to the judging result.
Further, the first rule is that an absolute value of a longitude difference w of two adjacent track points is greater than a threshold value.
Further, the determining, according to the obtained longitude of the track point, whether the route track spans 180 ° of the east-west longitude by using the first rule includes: acquiring longitudes of two adjacent track points on a route; calculating absolute values of longitude differences w of the two adjacent track points; and judging whether the absolute value of w is larger than a threshold value, if so, the route track spans 180 degrees of east-west longitude, and if not, the route track does not span 180 degrees of east-west longitude.
Further, according to the judging result, displaying the route track according to a second rule, including: when the judgment result shows that the route track does not cross the east-west longitude by 180 degrees, displaying track points on the route according to a first mode; and when the judgment result shows that the route track crosses 180 degrees of east-west longitude, displaying track points on the route according to a second mode.
Further, the first mode is to display the track points on the route on a map according to the longitude and latitude of the track points on the route.
Further, the second mode includes: determining the crossing direction of the route track crossing the east-west warp 180 degrees; performing offset processing on the crossed track points according to the crossing direction of the route track; defining a map according to the crossing direction of the route track; and displaying the track points on the route according to the longitude and latitude of the track points after the deviation on the defined map.
Further, the determining a crossing direction of the route track crossing the east-west longitude 180 degrees meridian comprises: acquiring longitudes of two adjacent route track points in line with a first rule, judging the change of longitude values of the two track points in line, and judging that the route track spans from west to east if the two longitude values are from positive numbers to negative numbers; if the two longitude values are from negative to positive, then the course trajectory is determined to span from east to west.
Further, the offset processing for the track points after crossing according to the crossing direction of the route track comprises: acquiring the crossing direction of the route track, if the route track crosses from west to east, keeping the latitude of the crossed track point unchanged, and increasing the longitude by 360 degrees so as to offset the crossed track point; if the route track spans from east to west, the latitude of the track point after the span is kept unchanged, the longitude of the track point is reduced by 360 degrees, and therefore the track point after the span is subjected to offset processing.
Further, the defining the map according to the route track crossing direction includes: acquiring the crossing direction of the route track, and if the route track crosses from west to east, defining the map as adding a calibration degree to the east longitude; if the route track spans from east to west, defining the map as the westward longitude, and reducing the calibration degree; when the route track spans from west to east, the calibration degree is larger than the difference between the maximum longitude value of the track point after the offset processing and 180 degrees; when the route track spans from west to east, the calibration degree is larger than the absolute value of the minimum longitude value of the track point after the offset processing and the minus 180 DEG difference.
Further, the threshold is 180.
The beneficial effects of the application are as follows:
1. the absolute value of the longitude difference w of two adjacent track points is larger than the threshold value 180, and is used as a rule to judge whether the track crosses the east-west longitude 180 degrees or not, and fully considers the crossing conditions in the east direction and the west direction, so that a computer can accurately judge the crossing condition;
2. according to the application, the computer can simply, conveniently and accurately judge the crossing direction of the route track through the change condition of longitude values of the two track points;
3. the method and the device perform offset processing on the spanned track points according to the spanned direction of the route track, and coordinate with the definition of the map, so that the route track points spanned by 180 degrees of east-west warp can be correctly displayed on the defined map.
Drawings
FIG. 1 is a schematic illustration of an erroneous airline track display for one embodiment of a method of displaying an airline track across the east-west longitude 180;
FIG. 2 is a schematic diagram of a correct course trajectory display according to one embodiment of the application;
FIG. 3 is a flow chart of one embodiment of the present application.
In the figure:
1-east-west warp 180 degrees; 2-map initial format; 3-a map format defined by 180 degrees east-west warp to east; 4-a map format defined by 180 ° east-west warp and west warp.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made with reference to fig. 1-2 and examples.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The longitude and latitude define the primary meridian as 0 degrees, the east longitude and the west longitude are respectively defined on the east and west meridians, the primary meridian increases to the east and the maximum is 180 degrees; decreasing to the west, at a minimum of-180 °. But since the earth is spherical, the east and west meridians 180 ° and-180 ° are virtually coincident geographically. If a ship sails through 180 degrees of longitude 1 of east-west longitude, the coordinates of the initial four track points are shown in the following table one:
table one: coordinate detail table of four track points of ship initiation
From the above table, it can be seen that the second point to the third point pass through the east-west warp 1 at an angle of 180 degrees, and because the earth is spherical, there are two arrival modes in practice, one is that the ship directly crosses the east-west warp 1 at an angle of 180 degrees, and the second point reaches the third point; the other is that the longitude of the ship route track is reduced from 178 DEG to 0 DEG and then reduced to-179 DEG, the latitude is increased from 32 DEG to 34 DEG, and the ship route track is formed by passing through the initial meridian of 0 DEG from the second coordinate point (178 DEG, 32 DEG) to the west and then reaching the third coordinate point (-179 DEG, 34 DEG), and the ship route track surrounds the earth for one circle, as shown by the error track in the figure 1.
For computer programs, the computer will directly understand the second approach in the calculation process, namely, the ship passes through the primary meridian from the second point to the west and then reaches the third point to encircle the earth.
In order to realize the correct display of the ship route track as shown in fig. 2, the application provides a route track display method crossing the east-west longitude by 180 degrees, as shown in fig. 3, comprising the following steps:
s1, acquiring longitude and latitude of a track point on a route;
s2, judging whether the route track spans 180 degrees of the east-west longitude by using the first rule. In the embodiment of the present application, the first rule is that the absolute value of the longitude difference w of two adjacent track points is greater than a threshold value, wherein the first rule threshold value is 180.
The method specifically comprises the following steps:
s21, acquiring longitudes of two adjacent track points on a route;
s22, calculating absolute values of longitude differences w of two adjacent track points of the first rule;
s23, judging whether the absolute value of w is larger than a threshold value, if so, the route track spans 180 degrees of the east-west longitude, otherwise, the route track does not span 180 degrees of the east-west longitude.
As a second trajectory point (178 °,32 °) on the course trajectory, the absolute value of the longitude difference w from the first trajectory point (175 °,30 °) is ▏ 178-175 ▏ =3, and 3<180, so the second trajectory point does not achieve crossing; as a third trace point (-179 °,34 °) on the course trace, its absolute value of the longitude difference w from the second trace point (178 °,32 °) is ▏ - (-179) ▏ =357, whereas 357>180, the third trace point spans with respect to the adjacent second trace point.
S3, displaying the first regular route track according to the second rule according to the judging result, wherein the S3 comprises the following steps:
when the judgment result shows that the route track does not cross the east-west longitude by 180 degrees, displaying track points on the route according to a first mode; in the embodiment of the application, the first rule first mode is that the longitude and latitude of the track point on the first rule route are displayed on the map conventionally.
And when the judgment result shows that the route track crosses 180 degrees of east-west longitude, displaying track points on the route according to a second mode. In an embodiment of the present application, the first rule second mode includes:
p1, determining the crossing direction of a route track crossing an east-west warp 180 degrees and a warp 1;
because the track points of the route should be a series of continuous points, if the route spans the 180-degree meridian 1, the direction of the route track which spans the 180-degree meridian 1 can be judged according to the change of longitude values of two track points in sequence.
If the value is from positive to negative, the crossing is from west to east. For example, if the first locus point coordinate is (178, 30), i.e., (east longitude 178, north latitude 30), longitude-180 and longitude +180 are coincident on the map, then the next locus point is (-179,30), i.e., (west longitude 179, north latitude 30), then the course locus is from left to right of the 180 degree meridian, and the direction on the map is left west east to right east, i.e., the course locus crosses from west east.
Conversely, if the value is from a negative value to a positive value, the crossing is from west to east. For example, if the first locus point coordinate above is (-178, 30), i.e., (west longitude 178, north latitude 30), longitude-180 and longitude +180 are coincident on the map, then the next locus point is (179,30), i.e., (east longitude 179, north latitude 30), then the course trace is from right to left of the 180 degree meridian, and the direction on the map is left west right east, i.e., course trace traverses from east to west.
Thus, determining the direction of traversal of the airline trajectory across the east-west longitude 180 ° meridian 1 may be performed as follows:
acquiring longitudes of two adjacent route track points in line with a first rule, judging the change of longitude values of the two track points in line, and judging that the route track spans from west to east if the two longitude values are from positive numbers to negative numbers; if the two longitude values are from negative to positive, then the course trajectory is determined to span from east to west.
P2, performing offset processing on the crossed track points according to the crossing direction of the route track; comprising the following steps:
acquiring the crossing direction of the route track, if the route track crosses from west to east, keeping the latitude of the crossed track point unchanged, and increasing the longitude by 360 degrees so as to offset the crossed track point; if the route track spans from east to west, the latitude of the track point after the span is kept unchanged, the longitude of the track point is reduced by 360 degrees, and therefore the track point after the span is subjected to offset processing.
The coordinates of four track points of the ship after 180-degree deviation treatment from west to east and across east and west are shown in the following table two:
and (II) table: coordinate detail table of four track points after ship offset treatment
| Sequence number | Longitude and latitude | Latitude of latitude |
| 1 | 175 | 30 |
| 2 | 178 | 32 |
| 3 | 181 | 34 |
| 4 | 184 | 36 |
That is, the longitude of the third track point is-179+360=181 degrees, and the longitude of the fourth track point is-176+360=184 degrees.
P3, defining a map according to the crossing direction of the route track; comprising the following steps:
acquiring the crossing direction of the route track, and if the route track crosses from west to east, defining the map as adding a calibration degree to the east longitude; if the route track spans from east to west, defining the map as the westward longitude, and reducing the calibration degree;
when the route track spans from west to east, the calibration degree is larger than the difference between the maximum longitude value of the track point after the offset processing and 180 degrees; when the route track spans from west to east, the calibration degree is larger than the absolute value of the minimum longitude value of the track point after the offset processing and the minus 180 DEG difference.
The definition of the map in the application can be understood as that the display amplitude of the map is increased on the basis of the initial map width 2 (namely, the map width 3 defined by the 180-degree longitude eastward and the map width 4 defined by the-180-degree longitude westward are shown in fig. 2, namely, the eastward longitude is increased by at least the calibration degree or the westward longitude is reduced by at least the calibration degree according to the requirement), and the extended part of the map is continuously spliced on the map from the boundaries of two ends (the eastward longitude and the westward longitude and the 180-degree longitude) of the 180-degree longitude. That is, it is also possible to increase 180 degrees or 360 degrees or more at a time. At this time, the maximum longitude on the map is no longer 180 °, but 180++the degree of calibration; the minimum longitude is no longer-180 degrees, but-180 degrees to the nominal degree; the maximum calibration degree is not limited to 180 degrees, and the minimum calibration degree is not limited to-180 degrees. The ship's travel track of table two above, which is 180 ° offset from west to east across east and west, has a longitude of-179+360=181 degrees for the third track point and a longitude of-176+360=184 degrees for the fourth track point. The maximum longitude value of the track point after the offset processing is 184 degrees of the fourth track point, and the difference between the maximum longitude value and 180 degrees is 4 degrees, and the calibration degree is larger than the difference between the maximum longitude value and 180 degrees of the track point after the offset processing, namely the calibration degree is required to be larger than 4 degrees at least, namely the map is required to be defined as the eastern longitude is increased by more than 4 degrees.
And P4, displaying the track points on the route according to the longitude and latitude of the track points after the deviation on the defined map.
For the defined map, the longitude of the calibration degree increased to the eastern longitude is larger than 180 degrees by default, such as 184 degrees of the fourth track point, or is increased to 220 degrees along with the continuous eastern movement of the track point so as to display the track point after the movement, but for the display, the actual longitude of the fourth track point is also such as-176 degrees, but for the display, the longitude is virtually larger than 180 degrees, otherwise, the longitude is reduced to the western direction, such that ambiguity of two arrival modes is eliminated, and for the coordinate after the movement of the track point after the movement, the map after the movement is displayed.
When the judgment result is that the route track does not cross the east-west longitude by 180 degrees, displaying the route track on the map according to the longitude and latitude of the track point on the route in a first mode according to the conventional method; when the judgment result is that the route track crosses 180 degrees of the east-west warp, determining a crossing direction of the route track crossing 180 degrees of the east-west warp and the warp 1 according to a second mode; performing offset processing on the crossed track points according to the crossing direction of the route track; defining (extending) the map according to the crossing direction of the route track; and then displaying the crossed track points on the route according to the longitude and latitude of the shifted track points on the defined (extended) map to obtain the display result of the correct route track in the figure 2.
Further, for the subsequent track point display after the route track spans 180 degrees of east-west longitude, the absolute value of the longitude difference w of two adjacent track points is still judged according to the first rule:
if the first rule is not satisfied, that is, the absolute value of w is less than 180, the rear track point does not realize crossing again relative to the front track point, and the offset and the display mode of the rear track point are the same as those of the front track point;
if the first rule is satisfied, i.e. the absolute value of w >180, the following track point again spans and returns to the original map area relative to the adjacent preceding track point, the track point is normally displayed in the original map area 2 according to the first mode.
The third track point in table two above has a longitude of-179 degrees, the offset processed longitude of-179+360=181 degrees, and the fourth track point has a longitude of-176 degrees. As a subsequent fourth track point of the third track point after the track trail crosses the east-west warp by 180 degrees, the absolute value of two points w is ▏ -176- (-179) ▏ =3, and 3<180, so that the fourth track point does not realize crossing, the track point is shifted and displayed in the same way as the previous third track point, namely, shift processing is carried out for-176+360=184 degrees, and the track point is displayed on a map format 3 defined by the warp of 180 degrees to the east; if a fifth track point (178, 40) is still present subsequently, the absolute value of the two points w is ▏ 178- (-176) ▏ =354 relative to the adjacent fourth track point, and 354>180, the fifth track point subsequently spans and returns to the original map initial breadth 2 relative to the adjacent fourth track point, and the track point (178, 40) is normally displayed according to the first mode. The subsequent track point judgment and display still applies the methods S1-S3 of the application, so that the computer program can correctly display the ship route track crossing the east-west longitude by 180 degrees.
It should be noted that, as an extreme case, the ship is sailed all the way around the earth, so that the situation of continuously crossing the east-west longitude by 180 degrees is not within the technical scheme of the application.
Alternatively, in this embodiment, it will be understood by those skilled in the art that all or part of the steps in the methods of the above embodiments may be performed by a program for instructing a terminal device to execute the steps, where the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.
The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the method of the various embodiments of the present application.
In several embodiments provided by the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and are merely a logical functional division, and there may be other manners of dividing the apparatus in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, unit or indirect coupling or communication connection of units, electrical or otherwise.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
The application and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the application as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present application.
Claims (10)
1. A method of displaying a route trajectory spanning 180 ° of east-west longitude, comprising:
acquiring longitude and latitude of a track point on a route;
judging whether the route track spans 180 degrees of east-west longitude or not according to the acquired track point longitude by utilizing a first rule;
and displaying the route track according to a second rule according to the judging result.
2. The method of claim 1, wherein the first rule is that an absolute value of a longitude difference w between two adjacent track points is greater than a threshold.
3. The method for displaying an airline track crossing 180 ° of east-west longitude according to claim 2, wherein said determining whether the airline track crosses 180 ° of east-west longitude according to the acquired track point longitude by using the first rule comprises:
acquiring longitudes of two adjacent track points on a route;
calculating absolute values of longitude differences w of the two adjacent track points;
and judging whether the absolute value of w is larger than a threshold value, if so, the route track spans 180 degrees of east-west longitude, and if not, the route track does not span 180 degrees of east-west longitude.
4. A route trace display method according to claim 3, wherein displaying the route trace according to the second rule according to the judgment result comprises:
when the judgment result shows that the route track does not cross the east-west longitude by 180 degrees, displaying track points on the route according to a first mode;
and when the judgment result shows that the route track crosses 180 degrees of east-west longitude, displaying track points on the route according to a second mode.
5. The method for displaying a route trace across 180 ° of east-west longitude of claim 4 wherein said first mode is displaying on a map conventionally according to latitude and longitude of trace points on said route.
6. The method of displaying an airline trajectory spanning 180 ° of east-west longitude of claim 4, wherein said second mode comprises:
determining the crossing direction of the route track crossing the east-west longitude by 180 degrees;
performing offset processing on the crossed track points according to the crossing direction of the route track;
defining a map according to the crossing direction of the route track;
and displaying the track points on the route according to the longitude and latitude of the track points after the deviation on the defined map.
7. The method of claim 6, wherein determining the direction of travel of the route track across the east-west longitude 180 ° comprises:
acquiring longitudes of two adjacent route track points in line with a first rule, judging the change of longitude values of the two track points in line, and judging that the route track spans from west to east if the two longitude values are from positive numbers to negative numbers; if the two longitude values are from negative to positive, then the course trajectory is determined to span from east to west.
8. The method for displaying an airline track crossing an east-west longitude 180 ° according to claim 6, wherein said performing an offset process on the crossed track points according to the direction of crossing the airline track comprises:
acquiring the crossing direction of the route track, if the route track crosses from west to east, keeping the latitude of the crossed track point unchanged, and increasing the longitude by 360 degrees so as to offset the crossed track point; if the route track spans from east to west, the latitude of the track point after the span is kept unchanged, the longitude of the track point is reduced by 360 degrees, and therefore the track point after the span is subjected to offset processing.
9. The method for displaying an airline track across an east-west longitude 180 ° according to claim 6, wherein said defining a map according to an airline track crossing direction comprises:
acquiring the crossing direction of the route track, and if the route track crosses from west to east, defining the map as adding a calibration degree to the east longitude; if the route track spans from east to west, defining the map as the westward longitude, and reducing the calibration degree;
when the route track spans from west to east, the calibration degree is larger than the difference between the maximum longitude value of the track point after the offset processing and 180 degrees; when the route track spans from west to east, the calibration degree is larger than the absolute value of the minimum longitude value of the track point after the offset processing and the minus 180 DEG difference.
10. The method of claim 2, wherein the threshold is 180.
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