topo4/data/crater/README

This data is for Crater Lake, Oregon.
Elevation data is from USGS 30 meter SDTS DEM files.

Files are:
    crater-e.tgz	USGS 30m SDTS DEM data, Crater Lake East quadrangle
    crater-w.tgz	USGS 30m SDTS DEM data, Crater Lake West quadrangle
    504J309i.tvg	TopoVista grid file, 513x513 points
    crater.ctg.gz	Composite Theme Grid data for the Crater Lake area
    crater.ppm.gz	PPM coloring file derived from CTG data

The data is ready for viewing.  With your path set to include topo4/bin, enter
    topo 504J309i.tvg crater.ppm.gz

To see how the viewable files were built, enter
    make -n

or to actually rebuild them (and some extras), enter
    make
