10.07.2015 Views

User Manual - pancroma

User Manual - pancroma

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42. Working with WorldWind Elevation Data________________________________________________________________The NASA WorldWind SDK site is designed to allow access to the WorldWinddatabase of geospatial information to developers interested in using theinformation in their applications. It is also possible to download co registeredimage and elevation data at http://worldwind.arc.nasa.gov/java/1.2.0/demos/using one of the demonstration applets posted on the site. After navigating to thepage you can access WorldWind data using the ‘Exporting Surface Imagery andElevations’ utility. You will need to check some of the relevant data layers inorder to best navigate the virtual globe. I found that checking the following layerswas helpful:NASA Blue Marble ImageBlue Marble (WMS) 2004i-cubed LandsatMSVirtual Earth AerialUSDA NAIPUSDA NAIP USGSNote that only the first four data layers are relevant for areas outside of theUnited States. The USDA NAIP and USGS NAIP USGS data layers seem tohave the highest resolution, apparently around 2m. As far as I can tell, the UrbanOrtho Image layer and the USGS topographic map data layers have not beenimplemented in the demonstration applet. An example USGS NAIP image isshown below.117

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