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Many states and smaller regions are running their own LIDAR elevation mapping missions.
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There's the ASTER ~30m dataset which is compiled from pairs of images in visible and infrared bands, using stereoscopy to generate the elevation info (think red/blue 3d glasses, and also how to give geology majors migraines). The USGS National Elevation Dataset has much of the country mapped in a patchwork of 3 and 10 meter resolution (sources: everything from SRTM, LIDAR, straight surveyor cussedness). There's a couple of other large scale elevation datasets available. Also on smaller creeks the SRTM resolution may be larger than the river is wide, therefore you are often getting heights from somewhere up the banks/canyon/gorge rather than a return at river level. So how does this mess with us while we are looking at elevations of rivers and surroundings? Rivers (especially those that people are worried about plotting their own course and portages, often have pretty high relief, so we're finding points in the SRTM dataset that have voids. Areas of high relief (especially when they are further off center of the Shuttle's track in that pass) are likely to have areas with voids (no data). Due to some of effects of how radar works, that could be the highest point in the square, the lowest, or something in between. This means if you walked outside and blocked out a 30 x 30 meter area you would only get one height for the whole area. Through the US most data is available at a 30 x 30 meter resolution. Yes, that is as awesome as it sounds, the Space Shuttle launched with a 60 meter radar interferomerty rig, but it does mean some limitations on the accuracy of the data. Google (and almost everyone else's) basic elevation dataset is from the Shuttle Radar Topography Mission. » Filter by Shorelines: Destination Questions & Trip Reports » Filter by News, Notices, & Announcements Beginner's Guide to Kayak Terminology - NRS.
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