Projection and Coordinate Systems
December 3, 2011 Common Map ProjectionsProjection and Coordinate SystemsMap projects are one of the fundamental concepts of geography and cartography. Selecting the right map projection is one of the important first considerations for accurate GIS analysis. The problem with projections (and the reason why there are so many types) is that it is very difficult to represent the curved 3D surface of the ... read more Map Projections and Coordinate SystemsProjection and Coordinate SystemsTutorials to help you understand the various projection and coordinate systems. Also find conversion tools to convert datasets from one system to another. Introduction to Map Projections What is a Map Projection? How is the 3D surface of the earth modeled onto a 2D surface? The basic concepts behind map projections explained. Common Map Projections ... read more November 18, 2011 What is the Public Land Survey and Why Do We Still Use It?Projection and Coordinate SystemsHave 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 Public Land Survey System (PLSS). ... read more March 27, 2008State Plane Coordinate SystemFeatures, Projection and Coordinate SystemsIf you’ve ever worked with GIS data regionally within the United States you’ve probably come across the State Plane Coordinate System. What is the State Plane Coordinate System? The State Plane Coordinate System (SPCS) is not a projection; rather it is a system for specifying positions of geodetic stations using plane rectangular coordinates. This coordinate ... read more August 25, 2006How to Calculate the Boundaries of an UTM ZoneProjection and Coordinate SystemsCalculating the eastern and western boundaries of a UTM is very straightforward. Developed by the U.S. Army, the Universal Transverse Mercator (UTM) is an international plane (rectangular) coordinate system. In the coordinate system, the world is divided into 60 zones of 6 degrees longitude. Each zone extends 3 degrees east and west from its central ... read more December 27, 2002Map ProjectionProjection and Coordinate SystemsA map projection is one of many methods used to represent the 3-dimensional surface of the earth or other round body on a 2-dimensional plane in cartography (mapmaking). This process is typically, but not necessarily, a mathematical procedure (some methods are graphically based). Creation of a Map Projection The creation of a map projection involves ... read more |
