76 Computing in Geographic Information Systems
are listed below.
1. Equal area or homolographic projection: This projection pre-
serves the area measurement on the map. In this projection system
the graticules are prepared in such a way that every quadrilateral
on it may appear proportionally equal in area to the corresponding
spherical quadrilateral. These map projections are useful for appli-
cations involving estimation of land use, land cover measurement,
land partitioning, city and town planning, area-wise resource allo-
cation, cadastral applications etc.
2. Orthomorphic projection: These types of projections preserve
the shape of the mapping surface. They are also known as confor-
mal projections. It is relatively difficult to preserve the shap