what is the most important source of spatial data in GIS
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1 Natural Earth Data. ...
2 Esri Open Data. ...
3 USGS Earth Explorer. ...
4 OpenStreetMap. ...
5 NASA's Socioeconomic Data and Applications Center (SEDAC) ...
6 Open Topography. ...
7 UNEP Environmental Data Explorer. ...
8 NASA Earth Observations (NEO)
The general consensus among the GIS community is that 60 to 80 % of the cost incurred during implementation of GIS technology lies in data acquisition, data compilation and database development. Existing hard copy maps, e.g. sometimes referred to as analogue maps, provide the most popular source for any GIS project.
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Answer:hard copy map
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