Archive for January, 2009
Using Depiction to create and display floods requires having elevation data. The elevation data available through Depiction’s Quickstart resource list is from the United States Geological Survey (USGS) – it is their default “30 meter resolution” – in other words, every 100 feet or so, it measures the height of the terrain. In general, this is good enough for big picture stuff.
For community or neighborhood level flood depictions, higher resolution elevation data works much better. You can access 10 meter elevation data from the USGS NED (National Elevation Dataset) site at http://seamless.usgs.gov/index.php though the process is bit cumbersome. Fortunately, there are other sites where publicly accessible 10 meter DEM (Digital Elevation Model) data can be found, easily downloaded to your computer and imported into your depiction. More >