![]() ![]() The USDA NAIP and USGS NAIP USGS data layers seem to have the highest resolution, apparently around 2m. ![]() Note that only the first four data layers are relevant for areas outside of the United States. I found that checking the following layers was helpful: You will need to check some of the relevant data layers in order to best navigate the virtual globe. There is a slight glitch to doing this as the elevation files are downloaded mirror flipped over the central East-West latitude line, but PANCROMA has a utility to correct this.Īfter navigating to the Demo Applications page, scroll down to the 'Exporting Surface Imagery and Elevations' utility. This greatly facilitates draping the image over the DEM to create terrain models. Using this program, it is possible to download co-registered satellite imagery along with SRTM DEM data. ![]() This article examines one of them, the 'Exporting Surface Imagery and Elevations' utility. Some of these are very interesting and useful. NASA posts demonstration Java applets at its Java SDK site. NASA also released the WorldWind SDK, an API designed to let developers access and extend the core capabilities. Unlike Google Earth, WorldWind is an open source application, and has been quietly adding capabilities, thanks in large part to its connection with NASA and its access to their data. WorldWind appeared around 2004 (about the same time as Google Earth) but was overshadowed into near obscurity by the massive marketing power of Google. Many GIS users are familiar with the NASA WorldWind virtual globe utility as the less well-known cousin of the extremely popular Google Earth application. See additional satellite image processing articles at menu selection 'White Papers' ![]()
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