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A method and device for displaying a map in a geographic information system gis
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A geographic information system and map technology, applied in the field of map display of geographic information system GIS, can solve problems such as map differences
Active Publication Date: 2016-08-03
GUANGDONG VTRON TECH CO LTD
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[0004] Embodiments of the present invention provide a geographic information system GIS map display method and device to solve the technical problem in the prior art that if the display ratios of the GIS display terminal and the GIS client are inconsistent, resulting in differences in the maps displayed by the two
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Embodiment 1
[0020] Please refer to figure 1 , the geographic information system GIS map display method that the embodiment of the present invention provides, comprises:
[0021] 110. Obtain the display scale of the GIS client.
[0022] Usually, the GIS display terminal runs on the processor of the video wall, and the GIS client runs on the ordinary PC, and the two communicate through the TCP / IP protocol. Wherein, the map data stored in the GIS display terminal includes several map layers with different display scales.
[0023] Suppose the map name is 3dgz, and there are four map layers "0", "1", "2", and "3", and the corresponding display scales are 1 / 128000, 1 / 64000, 1 / 32000, and 1 / 16000; Suppose the size of each map slice in the map layer is PicW*PicH, such as: 256*256, and the resolution of the video wall is WallW*WallH, such as 7680*7680.
[0024] Assuming that the display scale of the GIS client is 1 / 32001 at a certain moment, the GIS client notifies the GIS display terminal to di...
Embodiment 2
[0047] Please refer to Figure 4 , the geographic information system GIS map display device that the embodiment of the present invention provides, comprises:
[0048] Obtaining module 210, used to obtain the display scale of the GIS client;
[0049] The selection module 220 is used to compare the display ratio of the GIS client with the display ratios of several map layers stored in the GIS display terminal, and select a layer of map slices with the same or similar display ratios according to the comparison result;
[0050] The zooming and displaying module 230 is configured to acquire map slices from the selected map layer and zoom and display them, and the scaled display scale of the scaled map slices is the same as that of the GIS client.
[0051] Further, the selection module 220 can specifically be used for:
[0052] If the display scale of the client is smaller than the minimum display scale of the several map layers, select the map layer with the minimum display scale...
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Abstract
The invention discloses a map display method of a geographic information system (GIS), comprising: obtaining the display ratio of a GIS client; comparing the display ratio of the client with the display ratios of several map layers stored in the GIS display terminal; , select the map layer with the same or similar display scale; obtain the map slice data from the selected map layer and zoom and display it, and the display scale of the scaled map slice data is the same as that of the GIS client. The embodiment of the present invention also provides a corresponding device. The technical scheme of the invention can make the maps displayed by the GIS display terminal and the GIS client terminal completely consistent.
Description
technical field [0001] The invention relates to the technical field of geographic information systems, in particular to a map display method and device of a geographic information system (GIS). Background technique [0002] In the existing geographic information system (Geographic Information System, GIS): the GIS client can add map layers arbitrarily, and the data is generally vector or raster; the GIS display terminal is deployed on the processor of the video wall. Quickly display the map. The map data in the GIS display terminal is generally raster, specifically map slice data. Map slicing is to use a professional cutting tool to make the original map data into several levels of map layers according to the overlay information of the map in the client. Different levels of map layers have different scales. Each map layer contains several identical Dimensions of map tiles. [0003] When the GIS client needs to display a map of a certain scale, it needs to communicate with ...
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