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Expert. 123 answers. 9.6K people helped. Answer: arc second is 160 of an arcminute, 13600 of a degree, 11296000 of 26 Jul 2020 Calculate the angle of (a) 1∘ (degree) (b) 1' (minute of arc of are min) and (c ) 1''( secondof arc of arc sec) in radian. Use 360∘=2πrad.

The US government has been quietly releasing some of the Global 1 arc second SRTM outside the US bounds. The data has voids, but spikes and pits seem to be removed, allowing filling with a 3 arc second source. ( I'd still avoid Aster GDEM ). Get the data here: Earth Explorer Dick This is a tile of the National Elevation Dataset (NED) is 1/3 arc-second resolution.

An arcsecond, also called a second of an arc, is a unit of measurement that amounts to one sixtieth of an arcminute. Simply put, it is equal to 1/3600 degrees of an arc.

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( I'd still avoid Aster GDEM ). Get the data here: Earth Explorer Dick This is a tile of the National Elevation Dataset (NED) is 1/3 arc-second resolution. The National Elevation Dataset (NED) serves the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use NED data for global change research, hydrologic modeling, resource The DEM from SRTM (1 arc second) with filled up holes is available in clipped and unclipped format (useful if you want to derive contour lines or larger area than Switzerland).

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At the equator, an arc-second of longitude approximately equals an arc-second of latitude, which is 1/60th of a nautical mile (or 101.27 feet or 30.87 meters).
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(SRTM did not produce data for the northernmost latitudes or Antarctica.) The resolution for SRTM Void Filled data is 1 arc-second for the United States and 3 arc-seconds for global coverage.

The seamless 1/3 arc-second DEM layer is updated continually as new data become available. Other 3DEP products are nationally seamless DEMs in resolutions of 1, and 2 arc seconds. These seamless DEMs were referred to as the National Elevation Dataset (NED) from about 2000 through 2015 at which time they became the seamless DEM layers under the 3DEP program and the NED name and system were retired. 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.