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.
When selective availability was enabled, this added 50 meters of error horizontally and 100 meters vertically to GPS signals.
The Greenwich Meridian (or Prime Meridian) is a zero degrees longitudinal It is the start-point which we measure 180 degrees east and west.
From A to Z, we deliver stunning visualizations and meanings with the GIS Dictionary – Definition Glossary. Sharpen your skills with new GIS terminology.
Dark object subtraction, radiative transfer models and atmospheric modelling are common techniques used to for atmosphere correction in remote sensing.
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.
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.
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
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.
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.
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