Identification_Information: Citation: Citation_Information: Originator: VeeAnn A. Cross Publication_Date: 2010 Title: CLRHSHD_POTO.TIF: Color-hillshade relief GeoTIFF image of the Potomac River/Chesapeake Bay Area (UTM, Zone 18, NAD83) Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2009-1151 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2009/1151/data/basemap/clrhshd_poto.zip Online_Linkage: http://pubs.usgs.gov/of/2009/1151/html/catalog.html Larger_Work_Citation: Citation_Information: Originator: VeeAnn A. Cross Originator: David S. Foster Originator: John F. Bratton Publication_Date: 2010 Title: Continuous Resistivity Profiling and Seismic-Reflection Data Collected in 2006 from the Potomac River Estuary, Virginia and Maryland Series_Information: Series_Name: Open-File Report Issue_Identification: 2009-1151 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2009/1151/ Description: Abstract: In order to test hypotheses about groundwater flow under and into Chesapeake Bay, geophysical surveys were conducted by U.S. Geological Survey (USGS) scientists on Chesapeake Bay and the Potomac River Estuary in September 2006. Chesapeake Bay resource managers are concerned about nutrients that are entering the estuary via submarine groundwater discharge, which are contributing to eutrophication. The USGS has performed many related studies in recent years to provide managers with information necessary to make informed decisions about this issue. The research carried out as part of the study described here was designed to help refine nutrient budgets for Chesapeake Bay by characterizing submarine groundwater flow and discharge of groundwater beneath part of the mainstem and a major tributary, the Potomac River Estuary. Purpose: The purpose of this dataset is to provide the color-hillshade relief image of the Potomac area in GeoTIFF format (UTM zone 18, NAD83) that can be viewed by a variety of software programs. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1998 Single_Date/Time: Calendar_Date: 1999 Currentness_Reference: Publication data of the original datasets used to general the elevation grid from which this was derived. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -77.387222 East_Bounding_Coordinate: -75.604370 North_Bounding_Coordinate: 38.729651 South_Bounding_Coordinate: 37.706801 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Info Bank ID K-1-06-CH Theme_Keyword: bathymetry Theme_Keyword: NOAA's Ocean Service, Special Projects Theme_Keyword: hydrographic survey Theme_Keyword: estuary Theme_Keyword: estuarine bathymetry Theme_Keyword: elevation Theme_Keyword: digital elevation model Theme_Keyword: DEM Theme_Keyword: raster Theme_Keyword: National Elevation Dataset Theme_Keyword: NED Theme_Keyword: color-hillshade relief Theme_Keyword: GeoTIFF Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: inlandWaters Theme_Keyword: oceans Theme_Keyword: oceans and estuaries Theme_Keyword: oceans and coastal Theme_Keyword: imageryBaseMapsEarthCover Place: Place_Keyword_Thesaurus: General Place_Keyword: North America Place_Keyword: North Atlantic Place_Keyword: United States Place_Keyword: Virginia Place_Keyword: Potomac River Estuary Place_Keyword: Chesapeake Bay Place_Keyword: Maryland Access_Constraints: None. Use_Constraints: The public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey and the National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS) as the originators of the individual datasets. These data are not to be used for navigation. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2009/1151/data/basemap/clr_hshd.gif Browse_Graphic_File_Description: Thumbnail image of the color-hillshade relief image from the Potomac River Estuary area. Browse_Graphic_File_Type: GIF Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500 Cross_Reference: Citation_Information: Originator: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Special Projects (SP) Publication_Date: 1998 Title: Chesapeake Bay, VA/MD (M130) Bathymetric Digital Elevation Model (30 meter resolution) Derived From Source Hydrographic Survey Soundings Collected by NOAA Geospatial_Data_Presentation_Form: raster digital data Publication_Information: Publication_Place: Silver Spring, MD Publisher: NOAA's Ocean Service, Special Projects (SP) Online_Linkage: http://estuarinebathymetry.noaa.gov/ Cross_Reference: Citation_Information: Originator: U.S. Geological Survey (USGS), EROS Data Center Publication_Date: 1999 Title: National Elevation Dataset Publication_Information: Publication_Place: Sioux Falls, SD Publisher: U.S. Geological Survey Online_Linkage: http://ned.usgs.gov/ Online_Linkage: http://seamless.usgs.gov/ Data_Quality_Information: Completeness_Report: This dataset represents the complete elevation information for the area of interest in GeoTIFF format. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: This GeoTIFF is a combination of two dataset that provide the best-available data for the land elevations and the bathymetry of Chesapeake Bay. The 7.5-minute elevation data for the conterminous United States are the primary initial source data for the land elevation and were acquired from the National Elevation Dataset (NED). The bathymetry dataset was acquired from the NOAA estuarine bathymetry website. This dataset was derived from two hundred ninety-seven surveys dating from 1850 to 1993. The NED website does not specify any value for horizontal accuracy. According to the metadata accompanying the bathymetry dataset, the horizontal accuracy is expressed as an estimated root mean square error (RMSE). The estimate of the RMSE is based upon horizontal accuracy tests of the source soundings used to generate the DEM. As a first approximation the locational accuracy of the source soundings are 0.0015 m at source "Smooth Sheet" scale (120 m @ 1:80,000 to 15 m @ 1:10,000). Smooth Sheets are maps generated as a principle product of each (historic) hydrographic survey with fully corrected soundings plotted on them. In both cases the user needs to refer to the original datasets to establish the details of the data and their estimates of accuracy. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The metadata accompanying the NED dataset does not specify a vertical accuracy. However, the website indicates the vertical accuracy of the National Elevation Dataset (NED) varies spatially because of the variable quality of the source digital elevation models (DEMs). As such, the NED inherits the accuracy of the source DEMs. The most recently published figure of overall absolute vertical accuracy expressed as the root mean square error (RMSE) is 2.44 meters. The estuarine bathymetry metadata indicates the vertical RMSE statistic is used to describe the vertical accuracy of a DEM. It encompasses both random and systematic errors introduced during production of the data. The RMSE is encoded in element number 5 of record C of the DEM. This accuracy estimate includes components related to quantization of the source soundings (1.3 to 0.15 m), the systematic editing of the source data (1percent or 0.10m), un-sampled bathymetric features (estimated at less than 5 percent of depth), time related changes (erosion, deposition, and seismic shifts), and dredging operations (cut and fill). It is estimated that the accuracy of the Bathymetric DEMs is 2 percent of depth or 1 meter for depths grater than 20 meters and 2 percent of depth or 0.20 meters for depths shallower than 20 meters. THESE DEMs SHOULD NOT BE USED FOR NAVIGATION. The two datasets used to create this merged product are referenced to different vertical datums. The NED data use a vertical datum of NAVD88 while the estuarine data simply specifies the vertical datum as referenced to the local tidal datum at the time of the hydrographic survey. No adjustment was made to the individual datasets to attempt to eliminate this discrepancy. The user needs to refer to the original datasets to establish the details of the data and their estimates of accuracy. Lineage: Process_Step: Process_Description: Within ArcMap 9.2 a special legend was created for the poto_area elevation grid. The grid intervals were set using VACExtras version 2.1 - Raster - Legend Classifier. (VACExtras is an extension written and maintained in Woods Hole, MA for a collection of tools useful in ArcGIS). Once the legend intervals were established, colors at critical intervals were chosen and then these colors were ramped over the entire grid within the symbology window of the dataset. Source_Used_Citation_Abbreviation: poto_area Process_Date: 2009 Source_Produced_Citation_Abbreviation: poto_area Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: VACExtras 2.1 (within ArcMap 9.2) was then used to export this specialized color map to a text file in Fledermaus RGB format (Raster - Export Fledermaus Color Legend). Source_Used_Citation_Abbreviation: poto_area Process_Date: 2009 Source_Produced_Citation_Abbreviation: arcgiscolor.txt Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: An AWK script was written to reformat this text file into a format compatible with a GMT RGB ASCII color map. Source_Used_Citation_Abbreviation: arcgiscolor.txt Process_Date: 2009 Source_Produced_Citation_Abbreviation: tst.cpt Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: The combined elevation grid (poto_area: http://pubs.usgs.gov/of/2009/1151/data/basemap/elevation/poto_area.zip) was loaded into Mirone, version 1.5.0. Mirone is a MATLAB-based framework tool that allows the display and manipulation of a large number of grid format. This particular version is a stand-alone version intended to run under Windows (not requiring MATLAB). Mirone is capable of reading an ArcGIS binary grid. With the grid loaded, the newly generated ASCII color map was also loaded (Image - Color Palettes - Change Palette - File - Read GMT Palette - As Master). Source_Used_Citation_Abbreviation: poto_area Source_Used_Citation_Abbreviation: tst.cpt Process_Date: 2009 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: Using Mirone - Image - Illuminate - GMT grdgradient - option 1 (which is the GMT grdgradient classic), setting the Azimuth to 315 - the falsely colored grid is converted to a color-hillshade. This display was then exported as a GeoTIFF image using File - Save Image As - GeoTIFF. The option to "Preserve Image original size" was selected. Source_Used_Citation_Abbreviation: poto_area Source_Used_Citation_Abbreviation: tst.cpt Process_Date: 2009 Source_Produced_Citation_Abbreviation: clrhshd_poto.tif Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: GeoTIFFExamine was then used to open the GeoTIFF to verify the header information and to write a TIFF world file including this information. Source_Used_Citation_Abbreviation: clrhshd_poto.tif Process_Date: 2009 Source_Produced_Citation_Abbreviation: clrhshd_poto.tfw Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Process_Step: Process_Description: This GeoTIFF is compressed with LZW compression, which is not compatible with all software. Therefore, this TIFF image was opened in CorelPhotoPaint version 11 and the image was saved in an uncompressed format. Source_Used_Citation_Abbreviation: clrhshd_poto.tif Process_Date: 2009 Source_Produced_Citation_Abbreviation: clrhshd_poto.tif Process_Step: Process_Description: Using CorelPhotoPaint version 11 to save the image without LZW compression erased the georeferencing information in the header of the TIFF image. GeoTIFFExamine was used to retrieve the georeferencing information from the world file and repopulate the TIFF header making this image a GeoTIFF. Source_Used_Citation_Abbreviation: clrhshd_poto.tfw Process_Date: 2009 Source_Produced_Citation_Abbreviation: clrhshd_poto.tif Process_Step: Process_Description: For maximum compatibility and ease of use with ArcMap 9.2 and higher, the image was loaded into ArcMap 9.2. The projection of the image was defined using ArcToolbox - Data management Tools - Projections and Transformations - Define Projection. The coordinate system selected was NAD_1983_UTM_Zone_18N. Even though the image is a GeoTIFF and there is a world file, this additional step produces an AUX file with all the projection information that is easily read by ArcMap. Source_Used_Citation_Abbreviation: clrhshd_poto.tif Process_Date: 2009 Source_Produced_Citation_Abbreviation: clrhshd_poto.aux Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 3702 Column_Count: 5144 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -75.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 30.000000 Ordinate_Resolution: 30.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Neither the U.S. government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: WinZip Format_Version_Number: 9.0 Format_Information_Content: This WinZip file contains the color-hillshade relief GeoTIFF image, the TIFF world file, and the associated metadata files. Transfer_Size: 48 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2009/1151/data/basemap/clrhshd_poto.zip Fees: None. Technical_Prerequisites: This WinZip contains a GeoTIFF image and an accompanying world file. The user must have software capable of uncompressing the WinZip file. To simply view the image, any software capable of reading a TIFF file is sufficient. To view the image in its geospatial location, the user must have software that is either capable of reading the header information in the GeoTIFF, or alternatively reading the registration information in the TIFF world file. Metadata_Reference_Information: Metadata_Date: 20100325 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: VeeAnn A. Cross Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: Woods Hole Coastal and Marine Science Center Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile