Geodetic Datums: NAD 27, NAD 83 and WGS84
Ellipsoids, survey benchmarks and triangulation – these are the ingredients for geodetic datums. NAD27, NAD83 and WGS84 are common datums in North America.
Articles
GIS Online Certificate: Charting a Course in GIS
Imagine you can earn a GIS online certificate at some of the best institutes in the world without leaving your country… or even the comfort of your own home.
Degrees/Minutes/Seconds (DMS) vs Decimal Degrees (DD)
We can find any location on Earth using latitude and longitude coordinates. And we measure those coordinates with decimal degrees or degrees/minutes/seconds
Capitalizing First Letters with Python in ArcGIS
If your letters and words are all uppercase or lowercase in a field, and you want to capitalize the first letter of each word, use this Python code block.
What Is Selective Availability in GPS?
When selective availability was enabled, this added 50 meters of error horizontally and 100 meters vertically to GPS signals.
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.
GIS Dictionary – Geospatial Definition Glossary
From A to Z, we deliver stunning visualizations and meanings with the GIS Dictionary – Definition Glossary. Sharpen your skills with new GIS terminology.
What is Atmospheric Correction in Remote Sensing?
Dark object subtraction, radiative transfer models and atmospheric modelling are common techniques used to for atmosphere correction in remote sensing.
Halloween Maps for the Dead
5 Halloween Maps. Almost all cultures recognize spirits aka the dead. So we bring these 5 maps for the dead to get you in the spirit of Halloween.
How Map Projections Work
The best way to represent the Earth is with a globe. But map projections can be awfully useful too. Find out why cartographers use map projections in GIS.