Using Map Projections and Coordinate Systems
All geospatial data must be flattened onto a display surface
in order to visually portray what exists where. The mathematics and
craft of map projection are central to this process. Although there
is no limit to the ways geodata can be projected, conventions, constraints,
standards, and applications generally prescribe its usage. This chapter
describes what map projections are, how they are constructed and controlled,
their essential properties, and some possibilities and limitations.
If you are not acquainted with the types, properties, and uses
of map projections, read the first four sections. When constructing
maps—especially in an environment in which a variety of projections
are readily available—it is important to understand how to
evaluate projections to select one appropriate to the contents and
purpose of a given map.
 | Manipulating Raster Geodata | | What Is a Map Projection? |  |
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