I'm trying to access a web mapping service (MapQuest in this case) using the GDAL WMS driver.
Inspired by this page: http://www.3liz.com/blog/rldhont/index.php?post/2012/07/17/OpenStreetMap-Tiles-in-QGIS and this http://developer.mapquest.com/web/products/open/map I formulate an XML string such as this: <GDAL_WMS><Service name="TMS"><ServerUrl> http://otile1.mqcdn.com/tiles/1.0.0/sat/${z}/${x}/${y}.png</ServerUrl></Service><DataWindow><UpperLeftX>-1.035240e+007</UpperLeftX><UpperLeftY>5.297933e+006</UpperLeftY><LowerRightX>-1.035144e+007</LowerRightX><LowerRightY>5.297055e+006</LowerRightY><TileLevel>1</TileLevel><TileCountX>1</TileCountX><TileCountY>1</TileCountY><YOrigin>top</YOrigin></DataWindow><Projection>EPSG:3857</Projection><BlockSizeX>256</BlockSizeX><BlockSizeY>256</BlockSizeY><BandsCount>3</BandsCount><Cache /></GDAL_WMS> I was hoping this was going to return a georeferenced raster of just the area I'm interested in (defined by the DataWindow) but instead it seem to return a virtual image comprising the whole world. However, it comes bearing georeferencing info Corner Coordinates: Upper Left (-10352400.000, 5297933.000) Lower Left (-10352400.000, 5297055.000) Upper Right (-10351440.000, 5297933.000) Lower Right (-10351440.000, 5297055.000) Center (-10351920.000, 5297494.000) That indicates it IS the area I requested. But when you look at it, it's the whole world image. Is the DataWindow just ignored here? What is the proper process for requesting a DataWindow region and getting a proper reoreferenced raster subset back? And yes, we are within the license term for MapQuest. They've been helping us, but it looks like this issue isn't really them, it's how I'm using GDAL. Google, VirtualEarth and OSM all react the same way -- ignoring the DataWindow. -- Chris 'Xenon' Hanson, omo sanza lettere. [email protected] http://www.alphapixel.com/ Training • Consulting • Contracting 3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 • GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL Digital Imaging • GIS • GPS • osgEarth • Terrain • Telemetry • Cryptography • Digital Audio • LIDAR • Kinect • Embedded • Mobile • iPhone/iPad/iOS • Android @alphapixel <https://twitter.com/alphapixel> facebook.com/alphapixel (775) 623-PIXL [7495]
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