coordinate systems


GIS Learning

Geographic Coordinate System

Geographic Coordinate System

Map projections allow us to convert from sphere to planar (flat) representation. Geographic coordinate systems allow for the measurements of distances and to determine direction. Except for the Geographic Grid all coordinate systems are based on some form of map projection. Coordinates In a coordinate system, the X value given […]

GIS Learning

Map Projections and Coordinate Systems

Map Projections and Coordinate Systems

What are Map Projections? The shape of the earth is roughly spherical wheres as maps are two dimensional.   Map projection is a set of techniques designed to depict with reasonable accuracy the spherical earth in a two-dimensional (i.e. flat) media.  Map projection types are created by an imaginary source of […]

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 […]