Scientific Investigations Report 2007–5251

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5251
Version 2.0, June 2013

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Conversion Factors

Inch/Pound to SI

Multiply By To obtain
centimeter (cm) 0.3937 inch (in)
millimeter (mm) 0.03937 inch (in)
meter (m) 3.281 foot (ft)
kilometer (km) 0.6214 mile (mi)
square kilometer (km2) 0.3861 square mile (mi2)
meter per day (m/d) 3.281 foot per day (ft/d)
meter per year (m/yr) 3.281 foot per year (ft/yr)
millimeter per day (mm/d) 0.003281 foot per day (ft/d)
millimeter per month (mm/mo) 0.003281 foot per month (ft/mo)
millimeter per year (mm/yr) 0.03937 inch per year (in/yr)
kilometer per hour (km/h) 0.6214 mile per hour (mi/h)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32

Vertical displacements determined by InSAR and coordinates determined by Global Positioning System (GPS) surveying generally are reported in metric units. The industry standard for GPS usage is that field measurements and subsequent computations, including standard error determinations, are done in the metric system. The use of dual units in this report is intended to facilitate application of the data by maintaining the integrity of the original units of measurement for GPS surveying.

Sea level: In this report, “sea level” refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929)—a geodetic datum derived from a general adjustment of the first-order level nets of both the United Sates and Canada, formerly called Sea Level Datum of 1929.

Ellipsoid heights: In this report, Global Positioning System (GPS) measurements of horizontal coordinates and ellipsoid heights are based on the North American Datum of 1983 (NAD83).

Abbreviations and Acronyms

Caltrans California Department of Transportation
CGPS Continuous Global Positioning System
CVWD Coachella Valley Water District
DEM digital elevation model
ESA European Space Agency
GPS Global Positioning System
IGS International GPS Service
InSAR Interferometric Synthetic Aperture Radar
NGS National Geodetic Survey
SAR Synthetic Aperture Radar
SCIGN Southern California Integrated GPS Network
SOPAC Scripps Orbit and Permanent Array Center
UNAVCO University NAVSTAR (Navigation Signal Timing and Ranging) Consortium
USGS United States Geological Survey

Well-Numbering System

Figure - refer to figure caption for alternative text description

Wells are identified and numbered according to their location in the rectangular system for the subdivision of public lands. Identification consists of the township number, north or south; the range number, east or west; and the section number. Each section is divided into sixteen 40-acre tracts lettered consecutively (except I and O), beginning with "A" in the northeast corner of the section and progressing in a sinusoidal manner to "R" in the southeast corner. Within the 40-acre tract, wells are sequentially numbered in the order they are inventoried. The final letter refers to the base line and meridian. In California, there are three base lines and meridians; Humboldt (H), Mount Diablo (M), and San Bernardino (S). All wells in the study area are referenced to the San Bernardino base line and meridian (S) Well numbers consist of 15 characters and follow the format 005S006E23K002S. In this report, well numbers are abbreviated and written 5S/6E-23K2. Wells in the same township and range are referred to only by their section designation, 23K2. The following diagram shows how the number for well 5S/6E-23K2 is derived.

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