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What is meant by “best available” elevation data?

April 26, 2017best available Data ELEVATION meant

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What is meant by “best available” elevation data?

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A. “Best Available” refers to the highest resolution elevation data available to be incorporated into the NED database. These would vary from area to area. As stated in the NED Release Notes, the source data for the NED are selected from the available DEMs according to the following ranking (highest priority listed first): high-resolution elevation data, 10-meter USGS DEMs, 30-meter Level 2 USGS DEMs, 30-meter Level 1 USGS DEMs, 2-arc-second USGS DEMs, 3-arc-second USGS DEMs. Note that the 2-arc-second DEMs are used only in Alaska, and the 3-arc-second DEMs are used only to fill in values over some large water bodies.