GPS Accuracy: HDOP, PDOP, GDOP & Multipath
Have you ever wondered about your GPS accuracy? A well-designed GPS receiver can achieve a horizontal accuracy of 3 meters or better. But factors affect it.
Author: GISGeography
We help you learn Geographic Information Systems and remote sensing
What is Tobler’s First Law of Geography?
Tobler’s First Law of Geography states that everything is related to everything else, but near things are more related than distant things.
What is Conflation, Edge Matching and Rubbersheeting?
When you have two conflicting data sets, conflation resolves conflicts by preserving the most accurate one. Edgematching and rubbersheeting helps fix errors
The State Plane Coordinate System (SPCS)
The State Plane Coordinate System divides the United States into 124 zones to locate any point with a high level of accuracy (one part in 10,000).
Kriging Interpolation – The Prediction Is Strong in this One
The prediction is strong in kriging. In this guide to geostatistics we embark on a journey to sculpt a legendary prediction model with kriging interpolation
What Are Contour Lines on Topographic Maps?
Contour lines have constant values on them such as elevation. But it’s also used in meteorology (isopleth), magnetism (isogon) & even drive-time (isochrones)
Map Distortion with Tissot’s Indicatrix
Map distortion is best understood looking at Tissot’s indicatrix. It contains circles and shows how map projections distort shape, size and distances.
An Introduction to Esri ArcGIS Online (AGOL)
Have you ever wanted to create interactive web maps for your organization? Or how about the whole world? You can with Esri’s cloud-based ArcGIS Online.
Geosynchronous vs Geostationary Orbits
While geosynchronous satellites can have any inclination, the key difference is that satellites in geostationary orbit lie on the same plane as the equator.
Death, Taxes and the Esri ArcGIS 999999 Error: How to Fix It
Some things in life are certain. In ArcGIS, it’s the Esri 999999 error. Here are techniques to troubleshoot this ArcMap error.