About the north and south polar voids and layer overlay problems. #2408
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When XYZImageLayer was used to load the image map, I observed that the north and south poles were empty. Through checking the data, I learned that most XYZ image resources do not provide the image data of the north and south poles. May I ask how to avoid the appearance of such holes at the code level? When I tried to overlay a high-resolution tiff map of a local area on a lower resolution map, I observed a blank space at the border of the high-resolution map. I tried to solve the problem by setColorBlending, but did not solve it. What should I do to avoid the appearance of blank areas? |
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Replies: 3 comments 8 replies
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The reason for the "hole" at the poles is because the data is in the Spherical Mercator projection, which only reaches +/- 85 degrees latitude (approximately). As for the overlay, unless the GeoTIFF has the white color set as the NO-DATA color, it will render. You can use a layer shader to remove it in some cases; here's a simple example: <shader>
<![CDATA[
#pragma vp_function chroma_key, fragment
void chroma_key(inout vec4 color) {
const vec3 no_data = vec3(1,1,1);
float dist = distance(color.rgb, no_data);
if (dist <= 0.2)
color.a = 0.0;
}
]]>
</shader> |
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Ok, maybe I can use a layer with a transparent background to deal with the second problem. Thank you! Error tips: |
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(In the future, please post a new question to a new thread - thanks.) You must use the GDAL WMTS mini-driver to access WMTS in osgEarth. Here is an example: <GDALImage name="my wmts layer">
<connection>
WMTS:https://basemap.nationalmap.gov/arcgis/rest/services/USGSShadedReliefOnly/MapServer/WMTS/1.0.0/WMTSCapabilities.xml
</connection>
</GDALImage>More information is at https://gdal.org/drivers/raster/wmts.html |
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Ok, thanks! |
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I use this config for earth file, but the osgearth_imgui couldn't display the map layer, could you give me a help???? |
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Thanks you suggestion, May Be you are right. I will publish the WMTS service by myself on my own computer to test the wmts support. |
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Can you provide me with an Earth file format of a WMTS service that your test case can access? |
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I just used the one you pasted above |
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I successfully configured the WMTS service, but I found that it still couldn't be accessed. Finally, looking at the gdal source code, it needs to compile the libcurl module. And the runtime path needs the proj.db file. |
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Yes, that makes sense. GDAL in vcpkg includes CURL by default. If you're building GDAL yourself you will need to activate the curl support. You can also set the |
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The reason for the "hole" at the poles is because the data is in the Spherical Mercator projection, which only reaches +/- 85 degrees latitude (approximately).
As for the overlay, unless the GeoTIFF has the white color set as the NO-DATA color, it will render. You can use a layer shader to remove it in some cases; here's a simple example: