map projections


The Mercator projection. Source: USGS.

A Look at the Mercator Projection

Learn about the Mercator map projection – one of the most widely used and recently, most largely criticized projections. Amanda Briney takes a look at the history and development of the Mercator projection, how it works and some criticisms of the projection. The Mercator projection is just one of many map projections but it is one of the most recognizable.

Free GIS Books

Free GIS Books

Building a collection of reference and academic texts on GIS can be costly.  There are some free online source materials that can be a valuable contribution, especially if your book budget is nonexistent.  Most of these free GIS books are available in downloadable PDF format and can be read from […]

Best of GIS: Notable 2011 Geospatial Happenings

Best of GIS: Notable 2011 Geospatial Happenings

It’s been a very long time since I’ve done a “best of GIS” year end review.   Listed below are some of what I have found to be the more exciting and sometimes just plain fun happenings and advances in the GIS and greater geospatial field for the year 2011 […]

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

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 […]