This may not mean anything to you yet (if not, it will after the lesson
on projections and coordinate systems). Where not otherwise specified, the
data are in this Projection/Coordinate system:
Projection: STATEPLANE
Zone: 5626 (Washington State, South Zone)
Datum: HPGN*
Units: FEET
Spheroid: GRS1980
* HPGN (High Precision GPS Network) is also known as HARN (High Accuracy
Reference Network) or NAD83/91 (North American Datum of 1983, readjusted in
1991), but is similar to NAD83 for most purposes.
When asked for measurements, etc., it will be assumed that you are using the
State Plane data, and that the storage and measurement units are feet, unless
otherwise specified. This should make more sense to you when we cover projections.
Any datasets ending with other names (e.g., bound_utm) will have Projection/Coordinate
systems signified by the file name, and will be explained in the exercise or
assignment.
All sample data for the course are located on the accompanying CD, in the directories packgis and esridata.
The esridata directory contains a number of datasets for the USA, Canada,
Mexico, and the rest of the world. The datasets are from sources of very small
scale and are generally good only for coarse-scale display or analysis. These
data are generally stored in decimal degrees of latitude and longitude.
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