Geodetic Survey Benchmark
Maps & Cartography

Survey Benchmark Monument Locations

If you’re serious about geocaching, than you’ve probably heard of benchmark hunting. A survey benchmark is a disk in the ground with a latitude & longitude.

Quantile Classification United States
Maps & Cartography

Quantile Classification in GIS

Quantile classification divides classes so that the total number of features in each class are approximately the same (which is useful for showing rankings)

Greenwich Meridian
Maps & Cartography

Greenwich Meridian (Prime Meridian)

The Greenwich Meridian (or Prime Meridian) is a zero degrees longitudinal It is the start-point which we measure 180 degrees east and west.