Monitoring land subsidence in Sacramento Valley, California, using GPS

Journal of Surveying Engineering
By: , and 

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Abstract

Land subsidence measurement is usually based on a comparison of bench-mark elevations surveyed at different times. These bench marks, established for mapping or the national vertical control network, are not necessarily suitable for measuring land subsidence. Also, many bench marks have been destroyed or are unstable. Conventional releveling of the study area would be costly and would require several years to complete. Differences of as much as 3.9 ft between recent leveling and published bench-mark elevations have been documented at seven locations in the Sacramento Valley. Estimates of land subsidence less than about 0.3 ft are questionable because elevation data are based on leveling and adjustment procedures that occurred over many years. A new vertical control network based on the Global Positioning System (GPS) provides highly accurate vertical control data at relatively low costs, and the survey points can be placed where needed to obtain adequate areal coverage of the area affected by land subsidence.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Monitoring land subsidence in Sacramento Valley, California, using GPS
Series title Journal of Surveying Engineering
DOI 10.1061/(ASCE)0733-9453(1990)116:2(112)
Volume 116
Issue 2
Year Published 1990
Language English
Publisher ASCE
Contributing office(s) California Water Science Center
Description 19 p.
First page 112
Last page 130
Country United States
State California
Other Geospatial Sacramento Valley