U.S. Geological Survey 2007 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr07-1056_dn_pre_gps.shp Ryan F. Thompson Michaela R. Johnson Michael J. Anderson 2007 U.S. Geological Survey Scientific Investigations Report 2007-1056 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/of/2007/1056/ This data set contains land surface elevations on dry and wadeable portions of transects for pre-construction hydrographic surveys on the Missouri River below Gavins Point Dam for the Emergent Sandbar Habitat construction project near River Mile 761.4. Data tie- ins to local benchmarks also are included The purpose of this CD is to provide project files and GIS coverages for Task 1 of the Military Interdepartmental Purchase Request to the U.S. Army Corps of Engineers. 2004 ground condition Complete Unknown -97.230886 -96.582338 42.966037 42.651279 None inlandWaters Hydrographic Survey None Missouri River Below Gavins Point Dam none The Missouri River is a dynamic system. Although the elevation data were considered accurate at the time of collection, channel, shore, and highbank areas are unstable and the elevation can be expected to change. U.S. Geological Survey Ryan F. Thompson Hydrologist mailing and physical address

111 Kansas Ave SE

Huron SD 57350 605 352-4241 x225 rcthomps@usgs.gov Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Data were collected using Ashtech Z-Extreme real-time kinematic GPS receivers. A local base station was established using two nearby first order benchmarks. The antenna on the base unit was a Geodetic 4 REV A, model number 701975.01. Rove units were checked over a known control point. Antenna heights were measured to the nearest millimeter. GPS data was output using Carlson Software's SurvCE. Antenna height corrections were applied as necessary. Conversion to NGVD29 vertical datum was completed so that the data could be compared to existing COE benchmarks and gaging station data. The datum conversion was accomplished using the National Geodetic Survey's VERTCON program (http://www.ngs.noaa.gov/cgi-bin/VERTCON/vert_con.prl). The datum shift of -0.189 meters was the program output for benchmark U450 (pid NM1968), one of the primaries used to establish local control. Points have been checked and attributed Data were collected in NAD83 UTM Zone 14 meters. 2004 An ArcInfo coverage was generated from a textfile output of the raw data. 2004 Elevations were collected in NAVD88 and were converted to NGVD29 using VERTCON based on benchmark U450. Attributes for correction, elev_88m, elev_88ft, and elev_29ft were added and populated. 2004 The coverage was projected to South Dakota-South Stateplane coordinate feet. 2004 Attributes for x-coord and y-coord were added and populated using ADDXY. 2005 Vector Entity point 33642 Point 4 State Plane Coordinate System 4002 42.833333 44.400000 -100.333333 42.333333 2000000.000000 0.000000 coordinate pair 0.000256 0.000256 survey feet North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 National Geodetic Vertical Datum of 1929 0.1 ft Attribute values ofr07-1056_dn_pre_gps point attribute table ARC/INFO ® GIS Software DESCRIPTIO description of point USGS description description of point USGS ELEV_88M corrected elevation, NAVD88, meters, calculated by adding elevation and correction USGS Elev_88m corrected elevation, NAVD88, meters, calculated by adding elevation and correction USGS 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. OBJECTID object identifer USGS identifier object identifer USGS NORTHING UTM Zone 14 NAD83 Northing, in meters USGS Northing UTM Zone 14 NAD83 Northing, in meters USGS EASTING UTM Zone 14 NAD83 Easting, in meters USGS Easting UTM Zone 14 NAD83 Easting, in meters USGS CORRECTION Antenna height correction, if applicable, in meters USGS Correction Antenna height correction, if applicable, in meters USGS ELEVATION uncorrected point elevation USGS elevation uncorrected point elevation USGS ELEV_88FT elevation, NAVD88, feet, calculated by multiplying elev_88m by 3.28084 USGS Elev_88ft elevation, NAVD88, feet, calculated by multiplying elev_88m by 3.28084 USGS ELEV_29FT Elevation, in feet, NGVD29, calculated by subtracting vertcon correction of 0.189 meters from Elev_88m and multiplying by 3.28084 USGS elev_29ft Elevation, in feet, NGVD29, calculated by subtracting vertcon correction of 0.189 meters from Elev_88m and multiplying by 3.28084 USGS DNGPS_SPL_ identifier USGS dngps_spl_ identifier USGS DNGPS_SPL1 identifier USGS dngps_spl1 identifier USGS X_COORD South Dakota-South State Plane coordinate easting, in feet USGS spl_easting South Dakota-South State Plane coordinate easting, in feet USGS Y_COORD South Dakota-South state plane coordinate northing, in feet USGS spl_northing South Dakota-South state plane coordinate northing, in feet USGS 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+ofr041189it03 Downloadable Data The South Dakota and Nebraska Water Science Centers, the Water Resources Discipline (WRD) of the U.S. Geological Survey, and the U.S. Army Corps of Engineers make no guarantee nor offer any warranty concerning the accuracy, condition, or application of the information contained in these geographic data. The burden for determining fitness for use of this data lies entirely with the user. Although these data have been used successfully on computers of WRD, no warranty, expressed or implied, is made by WRD regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the WRD have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including , but not limited to, any loss of profits arising out of the delivery, installation, operation, or support by WRD. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. ARCE 0.898 http://water.usgs.gov/GIS/dsdl/dn_pre_gps.zip None 20070306 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+ofr07-1056_dn_pre_gps.shp FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile