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.
Author: GISGeography
We help you learn Geographic Information Systems and remote sensing
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.
What is Bit Depth for Satellite Data (and Images)
Bit depth is the amount of detail in each pixel expressed in units of bits. 1-bit rasters contain 2 values while 8-bit rasters range from 0-255
33 Map Elements to Include in Cartographic Design
This guide is like your compass – these 33 mapping tips will guide you in the right direction and show you how to create stunning cartographic maps.
The Remarkable History of GIS
Maps help us get to places. They help us make decisions. Maps have changed how we think about location. But where did it begin? We study the history of GIS.
NAD83 – We’re Not in Kansas Anymore
North American Datum of 1983 (NAD83) is 2-meters from geocentric and uses thousands of monuments with triangulation to create a reference frame for Earth
Image Compression and Encoding for Raster Data
Deploying efficient raster GIS compression techniques means reducing storage space. It can save money, time and also help network performance.