What is the resolution of ASTER DEM?
ASTER has two telescopes, one for nadir-viewing and another for backward-viewing, with a base-to-height ratio of 0.6. The spatial resolution is 15 meters (m) in the horizontal plane. Each scene consists of 4,100 samples by 4,200 lines which corresponds to about 60 kilometers (km) by 60 km ground area.
Where can I get elevation data?
Digital elevation data for the United States and its territories are available through The National Map Downloader. Click the “Help” link at the top of the page for detailed instructions on how to find and download data. There is a separate site for The National Map Services.
What is DEM resolution?
DEM data are used in flood models to represent a physical land-surface. The spatial resolution of a DEM refers to the area of land being represented by a single grid cell. So, a spatial resolution of 10 metres means one grid cell is representing a 10 x 10 metre area of physical land.
What is a 1 arc-second DEM?
The seamless 1 arc-second DEM layers are derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. The seamless 1 arc-second DEM layer provides coverage of the conterminous United States, Hawaii, Puerto Rico, other territorial islands, and much of Alaska and Canada.
What does 10m DEM mean?
How can I download DEM for free?
To download a free DEM you first need to register at (if you already have an EarthData account, you can log in directly). The next step is to draw a polygon of the area of interest. Then in the Dataset field select ALOS PALSAR – 2006 to 2011.
What is a DEM file?
DEMs are files that contain either points (vector) or pixels (raster), with each point or pixel having an elevation value. They come in a variety of file formats, from . csv to . dem to . DEMs: digital elevation models represent the land or “bare earth” (no trees, buildings, etc.)
