This section allows users easy access to a wide range of high-quality
digital data and GIS products covering the study area. Examples of GIS
products include the following map layers: hydrography, roads, vegetation
cover, forests, timber, and soils. The U.S. Geological Survey (USGS) provides
four different digital cartographic products: Digital Raster Graphic (DRG),
Digital Line Graph (DLG), Digital Elevation Model (DEM),
and Digital Orthophoto Quadrangle (DOQ).
You will need GIS software to view these data. The Dem3d and Dlgv32 viewers
are free downloadable software provided by the USGS for viewing digital
data. The viewers are compressed for faster downloading and require the
shareware WinZip to uncompress it. To download these software tools, use
the links below. These two software tools run on Windows platform.
For more information on the capabilities of these two software tools,
please visit the following sites:
Data Available for Download
DRG -- A scanned version of the USGS
DLG -- Cartographic data in vector
format (geographic data in points, lines and polygons).
DEM -- Cartographic/geographic data
of elevations in xyz coordinates (view data in 3-D).
DOQ -- A digital, uniform-scale image
created from aerial photos (a photographic map).
Features -- Features of resources
within the San Francisquito Creek watershed.
Map Layout -- A collection of
frequently requested map layouts for the San Francisquito Creek Project.
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