Tim S. McKinney 2008 raster digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir2008-5239_swpa_agir_wu_2000 Tim S. McKinney David W. Anning 2008 U.S. Geological Survey Scientific Investigations Report SIR 2008-5239 Salt Lake City U.S. Geological Survey This dataset is a 100-meter cell resolution raster dataset of estimated use of irrigated agricultural water use data for the southwestern U.S. The dataset was generated from 1:100,000-scale county boundary data, 30-meter 2001 National Land cover database (NLCD), and USGS estimated use of water in the United States in 2000. This dataset was created for use by the Southwest Principal Aquifer (SWPA) study to help characterize conceptual models of case studied National Water-Qualiity Assessment (NAWQA) Program alluvial basins as well as the possible natural and anthropogenic factors that may affect water quality. 2000 2001 publication date of the source data Complete None planned -125.501065 -102.546503 46.015254 29.090543 ISO 19115 Topic inlandWaters farming environment utilitiesCommunication None irrigated agriculture water use None southwest United States California Utah Colorado New Mexico Arizona Nevada None These data are not intended to be used as a survey product and are for reference purposes only.Southwestern US only, Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. U.S, Geological Survey, Utah Water Science Center Center Director mailing and physical address

2329 Orton Circle

Salt Lake City Utah 84119 USA 801-908-5000 801-908-5001 http://water.usgs.gov/GIS/browse/sir2008-5239_swpa_agir_wu_2000.jpg Illlustration of data set jpg Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.5.1450 Because Irrigation type and use data are not consistently available for the entire Southwest, no attempt was made to distribute water according to irrigation type. It is assumed that most agricultural crops in the Southwest are irrigated. Agricultural acreages, reported in USGS Estimated Use of Water, are taken from the U.S. Department of Agriculture (USDA) census of Agriculture. These estimates were used in this analysis rather than NLCD calculations. Census of Agriculture irrigated agricultural acreages are thought to provide a more accurate account of agricultural land use. Water use and acreage were distributed evenly over all NLCD agricultural land in a county. Thus, acreages and water may be distributed to some areas where NLCD agricultural land is misclassified by NLCD or may not be irrigated. Accuracy of agricultural land cover is assumed to be approximately the same as the NLCD Cultivated land cover, published accuracy estimates for Cultivated Land are 81%/79% (Errors of Omission/Commission)(Homer and others, 2004). Reference: Homer, C., Huang, C., Yang, L., Wylie, B., Coan, M., 2004. Development of a 2001 National Landcover Database for the United States. Photogrammetric Engineering and Remote Sensing, Vol. 70, No. 7, July 2004, pp. 829-840. Disaggregated irrigated agriculture water use estimates were summed for counties and checked for accuracy against USGS county-based estimates. No inconsistencies were observed Complete for the Southwestern U.S. Not for use at scales greater than 1:250,000 Department of Commerce, Census Bureau, Geography Division 2000 vector digital data http://www.census.gov/geo/www/cob/co2000.html online 2000 publication date county Provided the Federal Information Processing Standard (FIPS) code and county spatial extent used to join water use to the NLCD data. U.S. Geological Survey 200403 USGS Circular 1268 http://pubs.usgs.gov/circ/2004/circ1268/ online 2000 ground condition water_use USGS water use is a nationally consistent method of estimating water use in the U.S. This study is conducted once every 5 years and provides the irrigated acreages and withdrawal rates used in this dataset. U.S. Geological Survey 200309 none none http://www.mrlc.gov/ online 2001 ground condition nlcd01 Provided spatial extent of agricultural land. Selected cultivated agricultural values 81 and 82 from nlcd01 and resampled using nearest neighbor assignment to create 100-meter agriculture raster dataset. nlcd01 070508 nlcdag Analysis environment was set to the extent, mask, and cell size of nlcdag dataset. This mask was used to limit processing to only the areas of irrigated agriculture. The county boundary was rasterized within this analysis environment via county FIPS code. The result is a new 100-meter raster representing county FIPS codes in areas of irrigated agriculture. nlcdag county 070508 agfips The USGS water use tabular data was joined to the agfips raster via FIPS code. New attribute fields for acreage and wateruse were calculated based on the joined table fields. Irrigated acreages and gallons withdrawn for each county were divided by the cell count in that county resulting in per cell values of irrigated acreages and gallons used per cell per day. water_use agfips 070508 agir Irrigated agricultural attributes were multiplied by 100 and integerized to reduce file sized and to facilitate additional raster analysis resulting in a new raster, agirx00. Integerized attribute values result in small files sizes than floating point data and require less memory. Integer data are required for many analysis tools and are neccessary to view the value attribute table. agir 070508 agirx00 Dataset copied. H:\swpa_final\SWPA_GIS\agirx00_1 20090205 12530400 Raster Grid Cell 16112 17382 1 Albers Conical Equal Area 29.500000 45.500000 -96.000000 23.000000 0.000000 0.000000 row and column 100.000000 100.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 agirx00.vat Value attribute table ESRI Rowid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE FIPS as number, used to join water use. User defined unique whole numbers representing state and county. COUNT - cell count SPR_AC - Acres of sprinkler irrigated agriculture ESRI, User defined Whole numbers, representing the number of cells with value 0 2103 acres per cell x 100 SPR_AC MIC_AC Acres of micro sprinkler irrigated agriculture User defined 0 588 acres per cell x 100 SPRTOT_AC Total acres of sprinkler irrigated agriculture User defined 0 2691 acres per cell x 100 SUR_AC Acres of surface irrigated agriculture User defined 0 6067 acres per cell x 100 TOT_AC Tot acres of irrigated agriculture User defined 0 7250 acres per cell x 100 GW_GAL Irrigated agriculture from ground water User defigned 0 7727848 gallons per cell per day x 100 SW_GAL Irrigated agriculture from surface water User defined 0 19860294 gallons per cell per day x 100 GAL_CELL Total water use User defined 0 23345588 gallons per cell per day x 100 FIPSNUM Unique county and state code Federal Information Processing Standard unique number represents state and county. Details are available at http://www.census.gov/geo/www/fips/fips.html The dataset describes irrigated agriculture water use amounts and acreages multiplied by 100. The values were integerized to facilitate processing. provided above U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir2008-5239_swpa_agir_wu_2000 Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. agirx00 Raster Data Winzip 2208 kb http://water.usgs.gov/GIS/dsdl/SIR2008-5239_swpa_agir_wu_2000.zip None. This dataset is provided by USGS as a public service. 20080602 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998