Abstract


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Creating High Precision GIS For A Large California Water Agency
Track: Engineering and Engineering Design
Author(s): Gavin OLeary

Fresno Irrigation District (FID) covers over 380 square miles in California’s Central Valley. Historic survey work and groundwater monitoring had been based on multiple vertical datums from old control locations within FID. Some controls had subsided or been destroyed. FID needed accurate elevation and attribute data of facilities throughout the entire District.

We developed a single vertical datum for FID by establishing a series of new control locations. This new control network allowed us to use Real Time Kinematic(RTK) GPS methods, maintaining high horizontal and vertical accuracy while simultaneously collecting attributes and photos linked to each feature. The new spatial data has helped us create a high precision GIS to analyze groundwater elevations and aid in facilities planning for FID.

This presentation will cover the process for establishing the control network, our GPS methods, and GIS integration. Case examples showing benefits for groundwater management and facilities planning will be used.

Gavin OLeary
Provost & Pritchard Inc.
GIS
286 W. Cromwell Ave
Fresno, CA 93711
US
Phone: 559-449-2700
E-mail: goleary@ppeng.com