SI Global 1 Km
Provider: Spatial Insights, Inc.
Spatial Insights Global 1Km Elevation Data are worldwide Digital Elevation Models (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). The data were derived from several raster and vector sources of topographic information.
Spatial Insights Global 1KM Elevation Data have been seamlessly merged and are available by continent, country, and by tile. The data are available in formats compatible with major desktop mapping GIS systems on the market today including ArcView™ and MapInfo Professional™. The data are also great for use in Vertical Mapper™. Formats include USGS DEM (suitable for ArcView) and Vertical Mapper GRD (for MapInfo).
The global 1Km Elevation Data are based on data derived from 8 sources of elevation information, including vector and raster data sets. The following table lists the percentage of the global land surface area derived from each source:
|Source||Percent of Global Land Area|
|Digital Terrain Elevation Data||50.0%|
|Digital Chart of the World||29.9%|
|USGS 1-degree DEMs||6.7%|
|Army Map Service 1:1,000,000-scale maps||1.1%|
|International Map of the World 1:1,000,000-scale maps||3.7%|
|Peru 1:1,000,000-scale map||0.1%|
|New Zealand DEM||0.2%|
|Antarctic Digital Database||8.3%|
The absolute vertical accuracy varies by location according to the source data. Generally, the areas derived from the raster source data have higher accuracy than those derived from the vector source data. The full resolution 3-arc second DTED and USGS DEM’s have a vertical accuracy of + or – 30 meters linear error at the 90 percent confidence level.
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Since 1993, Spatial Insights has been leveraging unique partnerships with the industry’s leading providers of mapping software and data to provide solutions tailored specifically to meet our clients’ diverse needs.
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