GIS
Listed on the page, you will find the most comprehensive and free sources online.
A geographic information system (GIS) is a framework for gathering, managing, and analyzing data - ESRI.
Tutorials
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Open Source Geospatial Foundation Live - OSGeoLive
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Esri’s Massive Open Online Course Program - MOOC
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Others
Tools
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The best tools, resources and technologies for mapping
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Command line tool and library for transferring data with URLs - CURL
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Convert City map into hexagonal grid: