GIS Fundamentals
GIS Data Types PDF
Free primer on GIS data types: vector and raster, attribute tables, common file formats and when to use each.
VectorRasterFree
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An introduction to the Shuttle Radar Topography Mission HGT format: what the tiles contain, how resolution and datums differ between elevation products, and how to bring HGT data into QGIS for terrain analysis.
Free primer on GIS data types: vector and raster, attribute tables, common file formats and when to use each.