U.S. Geological Survey 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ha694c_spg1000gb_x 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 large springs defined as where discharge is generally greater than 1,000 gallons per minute in Utah and most of Nevada; and greater than 200 gallons per minute in more arid parts of Nevada and in California. 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 Complete None planned -119.880555 -111.396287 42.084511 35.725136 none spring inlandWaters none Nevada Oregon Utah California 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 and metadata was provided by Douglas O. Shipley and Toby L. Welborn 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 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. Point topology is present. Using ArcGIS Workstation commands and routines, all points were checked for missing 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 1000000 paper 1988 publication date HA694C map spatial and attribute information from sheet 2 of 2 1. The HA694C 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 springs were digitized directly into the coordinate system with a maximum RMS = 0.002. 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. 1995 1. Using ArcGIS Workstation, points were checked for missing and duplicate features. 2. The attribute SPG1000GB_X-ID was calculated to be a unique sequential integer equal to SPG1000GB_X#. The attributes were checked for unlabeled, misspelled, or inconsistent feature labels. 3. Point topology was built using the ArcGIS Workstation command BUILD. 20041025 Metadata structured and validated using metadata tools, MP and CNS, developed by Peter Schweitzer, U.S. Geological Survey. 20041025 Vector Entity point 253 Point 6 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.005115 0.005115 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 spg1000gb_x.pat point 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 Area is always zero for point coverages. Values are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Perimeter is always zero for point coverages. Values are automatically generated. SPG1000GB_X# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SPG1000GB_X-ID User-defined feature number. ESRI Whole numbers that are automatically generated. 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 ARCExport spatial and attribute information WinZip 0.009 http://water.usgs.gov/GIS/dsdl/ha694c_spg1000gb_x.e00.zip None. This data set is provided by USGS as a public service. 20050531 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_spg_1000gb_x FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998