What resolution is 1 arc second?
30 m
Data covering the United States were also released at a 1 arc-second (~30 m) resolution.
What resolution is 1/3 arc second?
approximately 10 m
This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/3 arc-second (approximately 10 m) resolution. The 3DEP data holdings serve as the elevation layer of The National Map, and provide foundational elevation information for earth science studies and mapping applications in the United States.
What is 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 1/3 arc second DEM mean?
1/3 arc-second – This is the highest resolution seamless DEM dataset for the U.S. with full coverage of the 48 conterminous states, Hawaii, and U.S. territories. Alaska coverage is partially available now and is being expanded to statewide coverage as part of the Alaska Mapping Initiative.
What is 1/9 arc second in meters?
Arc vs. Meters
| Arc | Meters (approximate) | Used for |
|---|---|---|
| 3 arc seconds | 90 meters | World-wide SRTM |
| 1 arc second | 30 meters | DEM from topo, USA SRTM |
| 1/3 arc second | 10 meters | DEM from topo |
| 1/9 arc second | 3.4 meters | Newer DEM from LIDAR |
What is SRTM 1 arc second?
SRTM data have been enhanced to fill areas of missing data to provide digital elevation data with a resolution of 1 arc-second for global coverage. The technology was modified for the SRTM mission to collect interferometric radar, which compared two radar images or signals taken at slightly different angles.
What is grid resolution?
Resolution is defined as the minimum distance between two objects that can be separated in the image. Many people mistakenly equate “resolution” to “pixel” or grid cell size, when resolution is actually approximately 2.83 times grid cell size.
What resolution is SRTM data?
1 arc-second
The resolution for SRTM Void Filled data is 1 arc-second for the United States and 3 arc-seconds for global coverage.