GIS Guides & Tutorials
Clear, practical explanations of the concepts behind the tools. Each guide is written for people who need to get a real job done, not a textbook.
UTM and Latitude/Longitude Explained (with Conversion)
What UTM zones, easting and northing mean, how they relate to lat/long, and how to convert between them correctly.
What Is MGRS? The Military Grid Reference System
How MGRS builds on UTM, how to read a grid reference, its precision levels, and when to use it over lat/long.
GeoJSON vs KML vs GPX vs CSV: Which Geo Format to Use
A practical comparison of the four common geospatial file formats, what each is good at, and how to convert between them.
Ground Sample Distance (GSD) in Drone Mapping
What GSD is, the formula behind it, how altitude and sensor choice affect it, and how to plan a mapping flight.
Coordinate Reference Systems and EPSG Codes, Explained
Datums, projections, EPSG codes, and why 4326 and 3857 show up everywhere in GIS and web mapping.