GIS Learning

Transversal Mercator projection. Map center is at 0°E, 0°N. Left border is near 85°W, right border is near 85°E. Source: Lars H. Rohwedder.Transversal Mercator projection. Map center is at 0°E, 0°N. Left border is near 85°W, right border is near 85°E. Source: Lars H. Rohwedder.

Common Map Projections

Selecting the right map projection is one of the important first considerations for accurate GIS analysis. Reviewed here are the Robinson, Transverse Mercator, Lambert Conformal Conic, and Space Oblique Mercator projections

GIS Learning

What is the Public Land Survey and Why Do We Still Use It?

What is the Public Land Survey and Why Do We Still Use It?

Have you ever wondered why on legal documents your house is not listed with your address but rather by parcel location?  If you have ever seen something akin to the southwest corner of the northeast corner of the northwest corner of Section 21, Township 4, that coordinate system is the […]

GPS

What is GPS?

What is GPS?

A decade ago not many civilians had heard of a GPS, let alone seen or used one.  Prior to the year 2000, Global Positioning Systems (GPS) and their receivers were expensive and largely limited in use to the military, government agencies, and specialized professions.   Now, GPS receivers are commonplace […]

Spatial Analysis

RQ-8A Fire Scout Vertical Takeoff and Landing Tactical Unmanned Aerial Vehicle (VTUAV) System.RQ-8A Fire Scout Vertical Takeoff and Landing Tactical Unmanned Aerial Vehicle (VTUAV) System. Sour ce: U.S. Navy photo by Photographer’s Mate 2nd Class Daniel J. McLain

Using Unmanned Aerial Systems (UAS) for Remote Sensing of Archaeological Sites

Unmanned vehicles are becoming more widely available both in the military and civilian sectors for their usefulness for remotely acquiring a variety of data.  Unmanned Aerial Systems (UAS), previously referred to as Unmanned Aerial Vehicles (UAV), are integrated ground, air, and data systems in which an aircraft (fixed wing or […]