ArcGIS Open Data hosted by ESRI allows the public to access and download GIS data of around 28,793 datasets from 2,267 organizations in worldwide for free. Data can be downloaded as spreadsheet (CSV), KML, shapefile (ZIP), or API. Any one can publish their data through ArcGIS Online groups, which helps to set up public facing websites where people can easily find and download your open data in a variety of open formats.
"I'm very positive about the future of GIS. It's the right technology at the right time. When I think of all the major problems that we face throughout the world today—overpopulation, food shortages, reduced agricultural production, adverse climate change, poverty—these are all quintessentially geographic problems. These problems are all concerned with the human relationship to the land, and this is where GIS can make its biggest contribution. GIS is the technology of our times and is uniquely suited to assist in solving the problems that we face."
-Dr. Roger F. Tomilson, Father of GIS
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