CN110704770A - Display method and device for expansion tile map based on WebGIS environment - Google Patents
Display method and device for expansion tile map based on WebGIS environment Download PDFInfo
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Abstract
The invention is suitable for the field of geographic information systems, and provides a method and a device for displaying an expansion tile map in a WebGIS environment, wherein the method comprises the following steps: obtaining an original tile, calculating a cutting target range, cutting a picture, zooming to a target size, rendering, drawing and displaying a target tile and the like. According to the method, the existing cached tile cache data set is used as a data source, when the zoom level exceeds the maximum preset level of the pyramid, target tile data exceeding the pyramid level in the tile map service is reconstructed through calculation and then rendered and displayed, a service publisher does not need to continuously plan slice data with a larger scale, and the whole implementation process is simple, low in cost and good in using effect.
Description
Technical Field
The invention belongs to the field of geographic information systems, and particularly relates to a display method and device for an expansion tile map based on a WebGIS environment.
Background
In the WebGIS platform, massive grid and vector data are published as tile map services and are provided for a client to call and display.
The main principle of the tile map service is to construct original data into pictures of each layer according to a certain pyramid scheme in advance to form a tile cache data set. The main parameters of the pyramid are the cutting origin (x, y), the pixel width and height of a single picture, information of each layer level (level number, line number, column number and geographic resolution), the geographic resolution definition of each layer and geographic resolution is defined in the form of a quadtree, and the geographic resolution is defined according to the level number, the line number, the column number and the geographic resolution
And calculating to obtain that the row number and the column number of each tile are increased in sequence from the upper left corner to the origin of the tangent graph as (0, 0).
When a client requests data under a specific scale, the system finds a matched level number according to the map scale, and calculates and obtains a start-stop row number and a start-stop column number of a required request tile according to the map window range. The request address of the specific tile containing the three parameters of the level, the row and the column can be directly constructed, and after the server obtains the request address, the target picture is taken from the tile cache data set and returned to the client side and drawn into the map container.
In practical engineering applications, spatial data published by the tile map service often has a specific maximum pyramid level for various reasons. That is, the tile data stored in the cache data set is a limited maximum scale. When the user is zooming the map, the map will appear as a blank piece if the zoom level exceeds the maximum level in the tile cache dataset. In view of this problem, the prior art generally requires the service publisher to continue to plan slice data with a larger scale, which causes a disk requirement of approximately 1 time on the storage space of the server, and in practical projects, the solution is not easy to achieve.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a display method for an extended tile map in a WebGIS-based environment, which aims to solve the technical problem that when the zoom level exceeds the maximum level in a tile cache data set, the map display is blank.
On one hand, the display method of the expansion tile map based on the WebGIS environment comprises the following steps:
when the map zooming exceeds the maximum preset level of the pyramid, acquiring a corresponding original tile according to the level, the row number and the column number of the target tile;
calculating a target range to be cut of the original tile, and cutting according to the target range to obtain a target picture;
scaling the target picture to a target size to form a target tile;
and returning the target tiles to the layer rendering module, and drawing and displaying in the map container.
Furthermore, the maximum preset level of the pyramid is L (n), and the current map is zoomed to the level L(n+m)Wherein m is equal to 1, and the grade, the row number and the column number of the target tile are L in sequence(n+m)、R(y)、C(x)。
Further, the row number of the corresponding original tile in the tile data set of the maximum preset level of the map service tile is
The column number is
Further, the original tile has width W and height H, and has unit of pixel, and the upper left corner is used as the calculation origin from the starting point (Clip)(x)，Clip(y)) Width of cutting W(m)Pixel, height H(m)Obtaining a target picture by using the picture in the pixel range; here W(m)＝W/2m，H(m)＝H/2mCutting the starting point Clip(x)＝W(m)*(C(x)-C(n，x)*2m)，Clip(y)＝W(m)*(R(y)-R(n，y)*2m)。
Further, in the step of scaling the target picture to a target size and forming the target tile, the target picture is scaled to a picture with a width of W and a height of H by using the javascript image object, and the target tile is formed.
In another aspect, the display device for expanding the tile map in the WebGIS environment includes the following steps:
the tile obtaining unit is used for obtaining the corresponding original tiles according to the level, the line number and the column number of the target tiles when the map zooming exceeds the maximum preset level of the pyramid;
the tile cutting unit is used for calculating a target range to be cut of the original tile and cutting the original tile according to the target range to obtain a target picture;
the picture scaling unit is used for scaling the target picture to a target size to form a target tile;
and the rendering display unit is used for returning the target tiles to the layer rendering module and performing drawing display in the map container.
Further, the maximum preset level of the pyramid is L(n)Zooming to level L for the current map(n+m)Wherein m is equal to 1, and the grade, the row number and the column number of the target tile are L in sequence(n+m)、R(y)、C(x)。
Further, the row number of the corresponding original tile in the tile data set of the maximum preset level of the map service tile is
The column number is
Further, the original tile has width W and height H, and has unit of pixel, and the upper left corner is used as the calculation origin from the beginningPoint (Clip)(x)，Clip(y)) Width of cutting W(m)Pixel, height H(m)Obtaining a target picture by using the picture in the pixel range; here W(m)＝W/2m，H(m)＝H/2mCutting the starting point Clip(x)＝W(m)*(C(x)-C(n，x)*2m)，Clip(y)＝W(m)*(R(y)-R(n，y)*2m)。
Further, the picture scaling unit scales the target picture to a picture with a width W and a height H using the javascript image object to form the target tile.
The invention has the beneficial effects that: under a WebGIS platform, even if the zoom level exceeds the maximum level in a tile cache data set, the method can also effectively utilize the existing cache data set of the existing tile map service, and can also display data on a map by acquiring and cutting pictures to zoom to a target size through original tiles without continuously slicing the original tiles at a large scale level, thereby effectively improving the problem of poor experience caused by sudden display blank of data browsing due to insufficient hierarchical planning of the map service for a user.
Drawings
Fig. 1 is a flowchart of a display method for an extended tile map in a WebGIS-based environment according to a first embodiment of the present invention;
fig. 2 is a block diagram of a display device for expanding a tile map in a WebGIS-based environment according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The first embodiment is as follows:
fig. 1 shows a flow of a display method for an extended tile map in a WebGIS-based environment according to an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown.
As shown in fig. 1, the method for displaying an expanded tile map based on a WebGIS environment according to this embodiment includes the following steps:
and step S1, when the map scaling exceeds the maximum preset level of the pyramid, acquiring the corresponding original tiles according to the level, the line number and the column number of the target tiles.
When a user zooms a map to a display interface, under normal conditions, the map has a scale data, the system finds a matched level number according to the map scale, calculates and obtains a start-stop line number and a start-stop column number of a required request tile according to a map window range, can directly construct a request address of a specific tile containing three parameters of level, line and column, and after the server obtains the request address, the target tile is taken from the tile cache data in a centralized manner, returned to the client and drawn into a map container. However, if the map level corresponding to the zoom exceeds the maximum preset level of the pyramid, the method of the invention first needs to acquire the original tile.
Suppose the pyramid maximum preset level of the tile map service is L(n)Zooming to level L for the current map(n+m)I.e. the maximum preset level is L(n)The upper m levels, where m ═ 1, are L for level, row number, and column number in that order(n+m)、R(y)、C(x)The corresponding original tile in the maximum preset level tile is calculated.
The row number of the original tile in the tile of the maximum preset level in the tile data set of the map service tile is derived from the quadtree principle
The column number is
And step S2, calculating a target range to be cut of the original tile, and cutting the original tile according to the target range to obtain a target picture.
Assuming that the original tile has a width W and a height H and has a unit of pixel, first, the width W of the target range to be clipped is calculated(m)And high H(m)Here W(m)＝W/2m，H(m)＝H/2m(ii) a Then, using the upper left corner as the calculation origin to calculate the position of the clipping start pixel point (Clip)(x)，Clip(y))。
Clip with abscissa(x)＝W(m)*(C(x)-C(n，x)*2m)；
Ordinate Clip(y)＝W(m)*(R(y)-R(n，y)*2m)。
Then (Clip)(x)，Clip(y)) As a starting point, the cutting width is W(m)Pixel, height H(m)And obtaining the target picture by the picture of the pixels.
And step S3, zooming the target picture to a target size to form a target tile.
In the step, the target picture is zoomed to a target size, the Javascript image object is used for zooming the target picture, and the target picture is zoomed to a picture with the width of W and the height of H to form a target tile.
And step S4, returning the target tiles to the layer rendering module, and drawing and displaying in the map container.
And returning the target tile as a base64 object to the layer rendering module, and finally performing drawing display in the map container. And rendering and displaying each target tile to obtain complete map interface display.
The method is simple and easy to implement, and can be flexibly selected to be implemented at a server side or a client side according to a system hardware architecture. If the PC terminal is selected, the implementation can be selected at the client terminal; if the mobile terminal is a mobile terminal, the implementation can be selected at a service terminal.
Example two:
fig. 2 illustrates a structure of a display device for expanding a tile map in a WebGIS-based environment according to an embodiment of the present invention, and only a portion related to the embodiment of the present invention is illustrated for convenience of description.
As shown in fig. 2, the display device for expanding a tile map in a WebGIS environment provided by this embodiment includes:
the tile obtaining unit 21 is configured to, when the map scaling exceeds the maximum preset level of the pyramid, obtain a corresponding original tile according to the level, the row number, and the column number of the target tile;
the tile cutting unit 22 is used for calculating a target range to be cut of the original tile and cutting the original tile according to the target range to obtain a target picture;
a picture scaling unit 23, configured to scale the target picture to a target size to form a target tile;
and the rendering display unit 24 is configured to return the target tile to the layer rendering module, and perform drawing display in the map container.
The respective functional units 21-24 described in this embodiment correspondingly implement steps S1-S4 in the first embodiment,
the method comprises the steps of firstly obtaining corresponding original tiles according to the grade, the line number and the column number of a target tile through a tile obtaining unit, then calculating a cutting target range through a tile cutting unit, cutting, zooming a cutting picture to a target size through a picture zooming unit, and finally rendering, drawing and displaying through a rendering and displaying unit. Wherein the maximum preset level of the pyramid is L(n)Zooming to level L for the current map(n+m)Wherein m is equal to 1, and the grade, the row number and the column number of the target tile are L in sequence(n+m)、R(y)、C(x)(ii) a The row number of the corresponding original tile in the tile data set of the maximum preset level is
The column number is
The original tile is W in width and H in height, the unit is pixel, the upper left corner is used as the calculation origin, and the starting point (Clip) is arranged(x)，Clip(y)) Cutting outA shear width of W(m)Pixel, height H(m)Obtaining a target picture by using the picture in the pixel range; here W(m)＝W/2m，H(m)＝H/2mCutting the starting point Clip(x)＝W(m)*(C(x)-C(n，x)*2m)，Clip(y)＝W(m)*(R(y)-R(n，y)*2m) (ii) a And the picture scaling unit scales the target picture to a picture with the width of W and the height of H by using the JavaScriptImage object to form a target tile.
In summary, in the embodiment of the present invention, the existing cached tile data is used as a data source, when the zoom level exceeds the maximum preset level of the pyramid, the target tile data exceeding the pyramid level in the tile map service is reconstructed through calculation, and then rendered and displayed, without a service publisher continuing to plan the tile data with a larger scale.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A display method of an expansion tile map based on a WebGIS environment is characterized by comprising the following steps:
when the map zooming exceeds the maximum preset level of the pyramid, acquiring a corresponding original tile according to the level, the row number and the column number of the target tile;
calculating a target range to be cut of the original tile, and cutting according to the target range to obtain a target picture;
scaling the target picture to a target size to form a target tile;
and returning the target tiles to the layer rendering module, and drawing and displaying in the map container.
2. The method for displaying expanded tile map based on WebGIS environment as claimed in claim 1, wherein said pyramid maximum isThe preset level is L(n)Zooming to level L for the current map(n+m)Wherein m is>1, the grade, the row number and the column number of the target tile are L in sequence(n+m)、R(y)、C(x)。
3. The method for displaying an extended tile map based on WebGIS environment as claimed in claim 2, wherein the row number of the corresponding original tile in the tile data set of the maximum preset level of the map service tile is
The column number is
4. The method for displaying the extended tile map based on the WebGIS environment as claimed in claim 3, wherein the original tile has a width W and a height H, the unit is pixel, the calculation origin is the upper left corner, and the start point (Clip) is selected from(x)，Clip(y)) Width of cutting W(m)Pixel, height H(m)Obtaining a target picture by using the picture in the pixel range; here W(m)＝W/2m，H(m)＝H/2mCutting the starting point Clip(x)＝W(m)*(C(x)-C(n，x)*2m)，Clip(y)＝W(m)*(R(y)-R(n，y)*2m)。
5. The method for displaying the extended tile map based on the WebGIS environment as claimed in claim 4, wherein in the step of scaling the target picture to a target size and forming the target tile, the target picture is scaled to a picture with a width W and a height H by using a JavaScriptImage object to form the target tile.
6. A display device for expanding tile map based on WebGIS environment, characterized in that the display device comprises the following steps:
the tile obtaining unit is used for obtaining the corresponding original tiles according to the level, the line number and the column number of the target tiles when the map zooming exceeds the maximum preset level of the pyramid;
the tile cutting unit is used for calculating a target range to be cut of the original tile and cutting the original tile according to the target range to obtain a target picture;
the picture scaling unit is used for scaling the target picture to a target size to form a target tile;
and the rendering display unit is used for returning the target tiles to the layer rendering module and performing drawing display in the map container.
7. The tile map expansion display device in WebGIS-based environment as claimed in claim 6, wherein the pyramid maximum preset level is L(n)Zooming to level L for the current map(n+m)Wherein m is>1, the grade, the row number and the column number of the target tile are L in sequence(n+m)、R(y)、C(x)。
8. The extended tile map display device in WebGIS-based environment as claimed in claim 7, wherein the row number of the corresponding original tile in the tile data set of the maximum preset level of the map service tile is
The column number is
9. The extended tile map display device according to claim 8, wherein the original tile has a width of W and a height of H, and has a unit of pixel, and the calculation origin is from the top left corner (Clip) of the original tile(x)，Clip(y)) Width of cutting W(m)Pixel, height H(m)Pictures of pixel ranges, i.e.Obtaining a target picture; here W(m)＝W/2m，H(m)＝H/2mCutting the starting point Clip(x)＝W(m)*(C(x)-C(n，x)*2m)，Clip(y)＝W(m)*(R(y)-R(n，y)*2m。
10. The display device for expanding the tile map based on the WebGIS environment as claimed in claim 9, wherein the picture scaling unit scales the target picture to a picture with width W and height H using a JavaScriptImage object to form the target tile.
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| CN111767415A (en) * | 2020-07-01 | 2020-10-13 | 成都星时代宇航科技有限公司 | Tile publishing method and device, electronic equipment and computer readable storage medium |
| CN111767415B (en) * | 2020-07-01 | 2021-03-16 | 成都星时代宇航科技有限公司 | Tile publishing method and device, electronic equipment and computer readable storage medium |
| CN113282647A (en) * | 2021-07-22 | 2021-08-20 | 武大吉奥信息技术有限公司 | Area control processing method based on tile map data |
| CN115984457A (en) * | 2022-12-02 | 2023-04-18 | 北京百度网讯科技有限公司 | Three-dimensional model display method and device and electronic equipment |
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