| California State University, Fresno |
PLANT 170T |
| Department of Plant Science |
Name:__________________________________ |
Geographic Coordinate Systems
A common problem in GIS and Precision Ag is acquiring data that
has been saved in an unknown coordinate system or projection. This
exercise uses coordinate systems in common use in California:
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Decimal Degrees (WGS-84)
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State Plane
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UTM
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Albers
Objectives:
- Learn about common coordinate systems used in California.
- Learn how to identify unknown data in common coordinate systems used in
California.
- Learn how to change the projection of a vector file in ArcView using the
Projection Utility.
Data: Unknown_data.ZIP and ca_projections.zip
Exercise:
Part I -- Name that coordinate system is this data?
- Open the ArcView project CA_Projections in the Projected_CA folder.
- Turn on the JPEG extension.
- Open View 1.
- Add all unknown feature and image themes from the __________ floder.
- Identify the projection by making the one of the new themes the active
theme, then zoom to the active theme.
- Which CA is the theme on top of?
- Complete the table below for all of the themes.
- Print a nice map showing and labeling all of the California Themes except
DD. No scale! Use the label tool (a text tool option) not a
legend. Add a clean title and your name and date, and a neatline to
the layout. Print the map.
| Theme Name |
Theme Type
(Vector/Raster) |
Sample coordinates |
Projection |
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Part II -- Projection Wizard
- Use the projection utility wizard (File|ArcView Projection Utility ) to
re-project the Farm_Map theme to UTM zone 11.
- Place the farm_map theme on top of the Soil_Map theme. Turn off all
other themes. The Soil_map theme is soil view data (based on IR
images).
- Classify the Soil_map Gridcode field. Label the farm_map theme with
Field Number.
- Create a clean layout showing this data. Include a scale, north
arrow, legend, etc.
- Print the map.
Part III -- Map Practice
- Create professional precipitation map of California by classifying the
CV_Rainfall theme (use the Precip field).
- Lay the California County theme over the rainfall map.
- Print the map.
Staple this sheet to the three maps and turn in.