Category Archives: Class Notes

UTM – Universal Transverse Mercator Geographic Coordinate System

Posted on August 28, 2008 by Rashid Faridi

Projections are a mathematical way of representing 3D earth on a 2D plane.The idea of the transverse mercator projection has its roots in the 18th century, but it did not come into common usage until after World War II. It … Continue reading →

Posted in Class Notes, earth, GIS, GPS, map making, Remote Sensing 101, Solar System | 4 Comments

The Water Cycle:Earth’s Water is Always in Circulation

Posted on March 22, 2008 by Rashid Faridi

The Earth’s water is always in circulation. It has been recycled for the last 3 billion years. This process is called the water cycle. The cycle starts when the sun’s heat evaporates water from the oceans into the atmosphere to … Continue reading →

Posted in Class Notes, water | 3 Comments

Datum, Ellipsoid, Rhumb Line, Secant, Spheroid, Tangent and other useful terms in Map Projection

Posted on February 12, 2008 by Rashid Faridi

Datum—A reference for position on the surface of the Earth. In surveying, a datum is a reference system for computing or correlating the results of surveys. There are two principal types of datums: vertical and horizontal. A vertical datum is … Continue reading →

Posted in Class Notes, Geography Practicals/Lab and Statistical Techniques, map making | 4 Comments