Rose L. Medina 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ha694c_et1000gb_p J.R. Harrill J.S. Gates J.M. Thomas 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey 1:1,000,000-scale, 2 sheets This data set consists of 1:1,000,000-scale areas where shallow ground water is consumed by evapotranspiration (ET) in the Great Basin. The source of this data set is sheet 2 of a 1988 U.S. Geological Survey hydrologic investigations atlas map (Harrill and others, 1988.) Reference Cited Harrill, J.R., Gates, J.S., and Thomas, J.M., 1988, Major ground-water flow systems in the Great Basin region of Nevada, Utah, and adjacent states: U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C, scale 1:1,000,000, 2 sheets. This data set was created as part of a U.S. Geological Survey study, done in cooperation with the Nevada Division of Environmental Protection, to evaluate the susceptibility and vulnerability of ground water to anthropogenic contamination. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. 1988 publication date of source map Complete None planned -120.102585 -111.418658 42.442085 35.404361 none evapotranspiration inlandWaters none Nevada Utah California Oregon Idaho Arizona Great Basin none These data are not intended to be used as a survey product and are for reference purposes 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 and the Nevada Division of Environmental Protection would be appreciated in products derived from these data. U.S. Geological Survey Public Information Assistant mailing and physical address

333 W. Nye Lane

Carson City NV 89706 USA (775) 887-7600 (775) 887-7629 GS-W-NVpublic-info@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with the Nevada Division of Environmental Protection. Technical review of this data set was provided by Toby L. Welborn and Douglas O. Shipley of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.580 J.R. Harrill J.S. Gates J.M. Thomas M.D. Mifflin 1988 map Plate 3, scale 1:1,000,000. J.S. Rosenshein, ed. P.R. Seaber, ed. 1988 document Geology of North America v. 0-2 Boulder, Colorado Geological Society of America All attempts were made to compare 100 percent of the digital attribute data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Frequency tests were run on the arc and polygon attributes to check that no features were unlabeled, misspelled, or inconsistent. Corrections were made until two visual and manual comparisons, combined with on-screen review, determined 100 percent of the digital attribute data matched the original source map. The logical consistency topologically is clean. Polygon and chain-node topology is present. Using ArcGIS Workstation commands and routines, all polygons were checked for closure, missing label points, multiple label points, sliver polygons, and duplicate features; all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete at 1:1,000,000-scale resolution for the Great Basin. All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. 550 meters Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The errors resulting from the quality of the source map are unknown. The source map was a folded paper map in good condition. The source map was allowed to flatten out before being digitized. The root mean square (RMS) errors encountered during the automation process were no greater than 0.002. The inherent error of a 1:1,000,000-scale map is approximately 508 meters according to the National Map Accuracy Standards of 1947. The horizontal positional accuracy was verified by visual and manual comparison as described in the Horizontal_Positional_Accuracy_Report and the Process_Steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at 550 meters. J.R. Harrill J.S. Gates J.M. Thomas 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey 1:1,000,000-scale, 2 sheets 1,000,000 paper 1988 publication date evaoptranspiration (ET) map spatial and attribute information from sheet 2 of 2 1. The ET map was securely taped to a digitizing table and registered to Lambert Conformal Conic projection for Nevada, North American Datum of 1927 (NAD27), parameters as follows: >Projection LAMBERT >Datum NAD27 >Zunits NO >Units METERS >Spheroid CLARKE1866 >Xshift 0.0000000000 >Yshift 0.0000000000 >Parameters > 33 0 0.000 /* 1st standard parallel > 45 0 0.000 /* 2nd standard parallel >-117 0 0.000 /* central meridian > 35 0 0.000 /* latitude of projection's origin >0.00000 /* false easting (meters) >0.00000 /* false northing (meters) The ET areas were digitized directly into the coordinate system with a maximum RMS = 0.002. The intersections of township and range lines of the Public Land Survey System were used as tics. The attribute ET was added to the polygon attribute table and populated with 'Y' where areas of ET were observed and 'N' for all other areas, such as island polygons. 2. 1:1,000,000-scale hard copy plots of the digital data were generated. Using a light table, these plots were visually and manually compared with the source. Corrections were made to the spatial data until two visual and manual comparisons, combined with on-screen review, determined there was no light between the plot and the source data, and the attribute data matched the source data. 3. The data set was projected from Lambert, NAD27 to UTM zone 11, NAD27. 1996 1. Using ArcGIS Workstation, including the command LABELERRORS and the node error, arc dangle, and intersect environment, polygons were checked for closure, missing or multiple labels, sliver polygons, and duplicates. Arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicates. 2. Using the ArcGIS Workstation command CENTROIDLABEL, labels were centered within the respective polygon. 3. For polygons, the attribute ETGB_P-ID was calculated to be a unique sequential integer equal to ETGB_P# - 1. The attributes were checked for unlabeled, misspelled, or inconsistent feature labels. 4. Polygon topology was built using the ArcGIS Workstation command CLEAN with the fuzzy tolerance = 0.001 and dangle = 0.01. 20040729 Metadata structured and validated using metadata tools, MP and CNS, developed by Peter Schweitzer, U.S. Geological Survey. 20040729 Vector Complete chain 278 Label point 251 GT-polygon composed of chains 251 Point 384 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.005596 0.005596 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 et1000gb_p.pat polygon attribute table ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Positive real numbers that are automatically generated. ET1000GB_P# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. ET1000GB_P-ID User-defined feature number. ESRI Whole numbers that are automatically generated. ET Describes where shallow ground water is consumed by evapotranspiration. ET map Y Area where shallow ground water is consumed by evapotranspiration user-defined N Area where shallow ground water is not consumed by evapotranspiration user-defined >ET_GB_P.PAT: > >COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME > 1 AREA 8 18 F 5 > 9 PERIMETER 8 18 F 5 > 17 ETGB_P# 4 5 B - > 21 ETGB_P-ID 4 5 B - > 25 ET 1 1 C - ET describes where shallow ground water is consumed by evapotranspiration. 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://water.usgs.gov/user_feedback_form.html Downloadable Data 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. WinZipped ARCE spatial and attribute information WinZip 0.525 http://water.usgs.gov/GIS/dsdl/ha694c_et1000gb_p.e00.zip None. This data set is provided by USGS as a public service. 20050518 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+ha694c_et1000gb_p FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998