CTM/Zia Maps Digital Base Maps

CTM/Zia Maps offers elevation-tinted, shaded relief format digital base maps
for presentation and analysis work.  These maps are created from USGS and
NGDC topographic data using CTM/Zia's proprietary software, EdWare, on a
Silicon Graphics Iris workstation.  Both 3-dimensional perspective views and
georeferenced planviews are available.  These base maps are raster-format
images available as 24-bit compressed TIFF or 8-bit GIF files.  They are
distributed on 1.44M 3.5" diskette in either DOS or MacIntosh format.

Three-dimensional scenes give the viewer instant recognition of complex
terrain.  Elevation-based tinting, together with illumination and shading from a
computer modelled light source (the Sun), bring clarity and enhanced depth
perception to the viewer.  Continent-scale views include the Earth's curvature,
presenting a striking graphic image.

Georeferenced planviews are ideal for traditional mapping applications.  A fixed
scale allows for accurate distance measurements and overlay of geographically-
oriented linework such as roads, rivers, and political boundaries.  A separate
file references the image in latitude/longitude as well as the projection
coordinate system (for example, UTM).  This lets the user import the image into
a Geographic Information System (GIS) or  mapping system that supports raster-
format data.  Alternatively, many users simply utilize the image as a powerful
presentation piece in a paint system or illustration package.

Higher resolution imagery and custom mapping work are also available.

For more information, please call (303) 444-1670 or fax (303) 444-9391.