Free Data Sources

• Tiger Data - In decimal degrees.  Use road and city themes for base layers.

• NRCS Soils Maps -- In decimal degrees.  See tip sheet for notes on using with ArcView. Availability Map. Users Guide (PDF)

• Projected Californias -- A set of ArcView themes with the state of California in different coordinate systems.  Useful in determining what coordinate system unknown data is in and for teaching about different coordinate systems.

• Orthophotos  (Terraserver) -- Free orthophotos in UTM.  

• California GIS Resources -- base layers, DEM.  Albers.

• Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic map. Albers. 

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Web References

• UTM

• Coordinate Systems

• GPS Overview

• Datums

• Map Projections (USGS)

• GPS Basics (Leica PDF Manual)

Teaching Materials

• DGPS Exercise

• Uncorrected GPS (Etrex) Exercise

• California Coordinate Systems

• Orthophoto Exercise (Word)

This site is funded by grants from USDA and ARI, and developed by California Polytechnic State University, San Luis Obispo, California State University, Fresno, and the University of California, Davis
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