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Maps & Cartography

World Geodetic System (WGS84)

The World Geodetic System 1984 (WGS84) is a spatial reference system of GPS satellites with an error of less than 2 cm to the center of Earth.

Global Forest Maps to See the Forest for the Trees

Satellite and mapping technologies tell a story of our trees and forests. These 4 global forest maps will help you start seeing the forest for the trees.

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.

Magnetic North vs Geographic (True) North Pole

The Magnetic North Pole is a point in Northern Canada where the northern lines of attraction enter the Earth. Compass needles point to the magnetic north.

5 Maps That Explain the Arctic

Mineral extraction, natural gas as well as potential shipping routes. These Arctic Maps display one of the last great frontiers for human development.

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)

10 Transportation Maps: Planes, Trains & Automobiles

This is one of the most comprehensive lists of global transportation maps on the planet. Whether it’s planes, trains or automobiles, you’ll love this guide.

Ellipsoid/Spheroid – Our Oblate Spheroid Planet Earth

Reference ellipsoids (ex. Clarke Ellipsoid) are smooth, mathematical models of the Earth’s shape. It has a semi-major and minor axis flattened at the poles.