The central meridian is the center line of longitude for projection systems. Projected coordinate systems often use it as a reference point for a x-origin.
Think you know remote sensing satellites? Think again. This satellite list has the top 50 satellites that silently orbit the Earth. In 30 words or less.
When you want historical imagery, the best web viewers are Google Earth, Esri’s Wayback Living Atlas, USGS LandLook, NASA Worldview and Planet’s Stories.
From scripting to real-time GIS (geofencing), our list of 7 free Esri training courses and MOOC will help you build a solid foundation for your career in GIS.
At the end of every year, we like to countdown our top 10 pieces of content. Since 2014 to now, we’ve put together what you’ve shared & liked the most from GISGeography
Selective availability is the intentional degradation of GPS signals. When selective availability was enabled, this added error horizontally and vertically to GPS signals.
There’s a bucket load of free GIS software packages available for you to map the world. Manage, visualize and edit GIS data with open source GIS software.
It’s a head-to-head GIS software showdown with the star-studded lineup in the GIS industry- ArcGIS vs QGIS. Discover the differences between ArcGIS and QGIS
