Identification_Information: Citation: Citation_Information: Originator: VeeAnn A. Cross Publication_Date: 2010 Title: RESGPSPNTS_JD251.SHP: Navigation, Bathymetry and Temperature Point at the Ship Position During Continuous Resistivity Profile Data Collection in the Potomac River/Chesapeake Bay on Sept. 8, 2006 on USGS Cruise 06018 Geospatial_Data_Presentation_Form: vector 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/navigation/resistivity/resgpspnts_jd251.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 point shapefile is to provide the ship's position, bathymetric values, and water temperature during the collection of continuous resistivity profile data. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20060908 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -76.856267 East_Bounding_Coordinate: -76.362700 North_Bounding_Coordinate: 38.231150 South_Bounding_Coordinate: 38.004733 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: Field Activity Serial Number 06018 Theme_Keyword: navigation Theme_Keyword: bathymetry Theme_Keyword: temperature Theme_Keyword: point Theme_Keyword: shapefile Theme_Keyword: Continuous Resistivity Profiling Theme_Keyword: CRP Theme_Keyword: R/V Kerhin Theme_Keyword: Lowrance GPS Theme_Keyword: Info Bank ID K-1-06-CH Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: inlandWaters Theme_Keyword: location Theme_Keyword: oceans Theme_Keyword: oceans and estuaries Theme_Keyword: oceans and coastal Place: Place_Keyword_Thesaurus: General Place_Keyword: North America Place_Keyword: North Atlantic Place_Keyword: United States Place_Keyword: Virginia Place_Keyword: Maryland Place_Keyword: Potomac River Estuary Place_Keyword: Chesapeake Bay Place_Keyword: Dennis Point Marina Place_Keyword: Solomons, Maryland Place_Keyword: Patuxent River 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 as the originator of the dataset. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: John F. Bratton Contact_Organization: U.S. Geological Survey 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 x2254 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: jbratton@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2009/1151/data/navigation/resistivity/resgpspnts_jd251.gif Browse_Graphic_File_Description: Thumbnail image showing the location of resistivity navigation points collected Sept. 8, 2006. The coastline is included for spatial reference. 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 Data_Quality_Information: Logical_Consistency_Report: No duplicate points are present. The navigational fixes were checked for valid values. Invalid data points were deleted. No other checks were performed. Completeness_Report: There is a navigational fix for every reading of resistivity data. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The primary navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located 7.9 meters forward of the anchor point for the resistivity streamer, and approximately 3 meters forward of the fathometer transducer. These offsets were not entered into the GPS system. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: On this day the bathymetric values were collected by the Lowrance fathometer. This fathometer was mounted mid-ship on the starboard side of the boat. The Lowrance manufacturer indicates the speed of sound used by the system to convert to depths is 4800 feet/second. All values are assumed to be accurate to within 1 meter. Lineage: Source_Information: Source_Contribution: The continuous resistivity profile (CRP) system used on this cruise was an AGI SuperSting marine system described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was a 100-m streamer with an 11 electrode array with electrodes spaced 10 meters apart. The source electrodes are graphite, while the receiver electrodes are stainless steel. A dipole-dipole configuration was used for the data collection in which two fixed current electrodes are assigned with the measurement of voltage potential between electrode pairs in the remaining electrodes. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and the *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information. The navigation system used in concert with the CRP system is a Lowrance LMS-480M with an LGC-2000 GPS antenna and a 200 kHz fathometer transducer. The transducer also contains a temperature sensor which was not working on Julian Day 249. Lowrance indicates the speed of sound used by the system is 4800 feet/second. On the first day of data collection (Julian Day 249, Sept. 6, 2006) the Lowrance transducer was side-mounted mid-ship on the port side of the boat. The remainder of the cruise the transducer was side-mounted mid-ship of the starboard side of the boat. The CRP system images the subsurface electrical properties of an estuarine, riverine or lacustrine environment. Resistivity differences can be attributed to subsurface geology (conductive vs less conductive layers) and hydrogeologic conditions with fresh water exhibiting high resistivity and saline conditions showing low resistivity. Process_Step: Process_Description: The data files were transferred from the acquisition computer via a USB thumb drive. The first step is to check the navigation recorded in the *.gps file for each line of acquisition. I ran an AWK script which extracts the navigation, bathymetry, and temperature information recorded in each individual GPS data file. This information is written to a comma-delimited ANSI text file. (* refers to the line name, which for this day are L20F1, L21f1, L22F1, L23F1, L24F1, L25F1, L25F2, L26F1) "doawk" - shell script run under CYGWIN (UNIX like environment that runs under Windows): >files=`ls *.gps | cut -d. -f1` >for file in $files >do >awk -f awkhold $file.gps $file >> resnav_jd251.txt >done > >AWK script "awkhold": >BEGIN { >FS = "," >} >{ >FS = "," >ARGC = 2 >depth = -9999 >temp = -9999 >if ($1=="$GPRMC") >{ >utctime = $2 >date = $10 >latdeg = substr($4,1,2) >latmin = substr($4,3,6) >declat = latdeg + (latmin/60) >londeg = substr($6,1,3) >lonmin = substr($6,4,6) >declon = -1 * (londeg + (lonmin/60)) >if (NR==1) { >holddepth = -9999 >holdtemp = -9999 >} >else { >printf("%9.6f, %9.6f, %s, %s, %5.1f, %5.1f, %s\n", holddeclon, holddeclat, >holdutctime, holddate, holddepth, holdtemp, ARGV[2]) >} >holdutctime = substr(utctime,1,2)":"substr(utctime,3,2)":"substr(utctime,5,2) >holddate = date >holddeclon = declon >holddeclat = declat >holddepth = -9999 >holdtemp = -9999 >} >if ($1=="$SDDPT") >{ >depthreal = $2 >holddepth = depthreal >} >if ($1=="$SDMTW") >{ >tempreal = $2 >holdtemp = tempreal >} >} >END { >printf("%9.6f, %9.6f, %s, %s, %5.1f, %5.1f, %s\n", holddeclon, holddeclat, >holdutctime, holddate, holddepth, holdtemp, ARGV[2]) >} Source_Used_Citation_Abbreviation: *.gps Process_Date: 2009 Source_Produced_Citation_Abbreviation: resnav_jd251.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: I then used VI to add the appropriate header line and the comma-delimited text file was imported to ArcMap 9.2: Tools - Add XY Data. The X field is longitude; Y field is latitude, and the Coordinate System was defined as Geographic, NAD83. Because of the format of the "gpstime" field, the default for ArcMap is to import this as a date/time field. Because I wanted this field to remain a text field, I edited the schema.ini file in the folder with the text file to define each attributes definition. I also made sure the DATE field imported as a text attribute to preserve the leading zero. I then used the data export (right-mouse click on the event theme, Data - Export Data) to save the event theme as a shapefile. >schema.ini: >[resnav_jd251.txt] >Format=CSVDelimited >ColNameHeader=True >Col1=longitude Double >Col2=latitude Double >Col3=gpstime Text Width 8 >Col4=gpsdate Text Width 10 >Col5=depth float >Col6=temp_c float >Col7=linename Text Width 11 Source_Used_Citation_Abbreviation: resnav_jd251.txt Process_Date: 2009 Source_Produced_Citation_Abbreviation: resgpspnts_jd251.shp 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 ArcMap 9.2 added the attributes "gps_src' and "bathy_src" so that I could differentiate the source of each navigation fix and bathymetry value. Even though this particular day was collected with one system, I maintained these fields for consistency with the other files. Source_Used_Citation_Abbreviation: resgpspnts_jd251.shp Process_Date: 2009 Source_Produced_Citation_Abbreviation: resgpspnts_jd251.shp 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 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 4918 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees 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 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: Local surface Depth_Resolution: 0.1 Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: resgpspnts_jd251try1 Entity_Type_Definition: ESRI point shapefile Entity_Type_Definition_Source: ESRI Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: longitude Attribute_Definition: Longitude coordinate of the point in decimal degrees, NAD83. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -76.856267 Range_Domain_Maximum: -76.3627 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: latitude Attribute_Definition: Latitude coordinate of the point in decimal degrees, NAD83. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 38.004733 Range_Domain_Maximum: 38.23115 Attribute_Units_of_Measure: decimal degrees Attribute: Attribute_Label: gpstime Attribute_Definition: GPS time in the format HH:MM:SS. GPS time is +4 hours from local time during the survey. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set. Attribute: Attribute_Label: gpsdate Attribute_Definition: The date recorded in the GPS navigation in the format DDMMYY. Because of the time offset from local time, this date could actually be different than the local acquisition date. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set. Attribute: Attribute_Label: depth_m Attribute_Definition: Depth of the water below the fathometer in meters recorded by the Lowrance system. A value of -9999 indicates either no value was available, or the value was invalid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.6 Range_Domain_Maximum: 18.6 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: temp_c Attribute_Definition: Water temperature in degrees Celsius as recorded at the Lowrance fathometer transducer. A value of -9999 indicates either no value was available, or the value was invalid. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.1 Range_Domain_Maximum: 25.5 Attribute_Units_of_Measure: degrees Celsius Attribute: Attribute_Label: linename Attribute_Definition: The alphanumeric name corresponding to the prefix of the GPS filename. This name reflects the name assigned to the line of data acquisition and incorporates modifiers to reflect modification of the GPS file. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set. Attribute: Attribute_Label: gps_src Attribute_Definition: The system from which the navigation point was derived. "Lowrance gps" indicates the Lowrance system supplied the navigational fix. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set. Attribute: Attribute_Label: bathy_src Attribute_Definition: The system from which the bathymetric value was acquired. "Lowrance fathometer" indicates the Lowrance system supplied the bathymetric value. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Character set. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: John F. Bratton Contact_Organization: U.S. Geological Survey 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 x2254 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: jbratton@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 point shapefile as well as the associated metadata files. Transfer_Size: 0.167 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2009/1151/data/navigation/resistivity/resgpspnts_jd251.zip Network_Resource_Name: http://pubs.usgs.gov/of/2009/1151/html/catalog.html Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: GBytes Recording_Format: UDF Fees: None. Technical_Prerequisites: This WinZip file contains data available in ESRI point shapefile format. The user must have software capable of uncompressing the WinZip file and reading/displaying the shapefile. Metadata_Reference_Information: Metadata_Date: 20090520 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 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile