gov.noaa.nodc:9500088 eng utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2025-03-19T23:30:39Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) Marine chemistry, fish / shell-fish surveys, benthic organisms, and marine toxic substances and pollutants data from current meter and other instruments in the Gulf of Mexico from 1993-01-26 to 1994-06-13 (NCEI Accession 9500088) 2002-11-19 publication 1995 creation NOAA National Centers for Environmental Information gov.noaa.nodc:9500088 NCEI Archive Management System 9500088 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher Gary A. Wolff Texas A&M University (TAMU) gary@gerg.tamu.edu https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information resourceProvider Texas A&M University (TAMU) https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information resourceProvider James M. Brooks Texas A&M University (TAMU) https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information principalInvestigator Texas A&M University (TAMU) https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information contributor Wolff, Gary A. Texas A&M University (TAMU) gary@gerg.tamu.edu https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information author Texas A&M University https://www.tamu.edu/ HTTPS Texas A&M University (TAMU) website Institution web page information author tableDigital Marine chemistry, fish / shell-fish surveys, benthic organisms, and marine toxic substances and pollutants data were collected using current meter and other instruments from J.W. POWELL and other platforms in the Gulf of Mexico. Data were collected from 26 January 1993 to 13 June 1994. Data were submitted by Dr. Gary Wolf of Texas A&M University with support from the Gulf of Mexico Offshore Operations Monitoring Experiment (GOOMEX). Data has been processed by NODC to the NODC standard F069 (Marine Chemistry), F123 (Fish/Shell-fish Surveys), F132 (Benthic Organisms), and F144 (Marine Toxic Substances and Pollutants) formats. The F069 format is used for data from chemical analyses of seawater samples. Cruise information, position, date, and time is reported for each station along with sample depth, temperature, salinity, and density (sigma-t). Chemical and biochemical parameters that may be reported include: dissolved oxygen, nitrate, nitrite, ammonia, inorganic phosphate, and silicate; dissolved organic carbon, particulate organic carbon, and particulate organic nitrogen; and apparent oxygen utilization, percent oxygen saturation, adenosine triphosphate, total phaeophytin, total chlorophyll, total suspended matter, total recoverable petroleum hydrocarbons, and total resolved light hydrocarbons. The F123 format is used for data from field sampling of marine fish and shellfish. The data derive from analysis of midwater or bottom tow catches and provide information on population density and distribution. Cruise information, position, date, time, gear type, fishing distance and duration, and number of hauls are reported for each survey. Environmental data may include meteorological conditions, surface and bottom temperature and salinity, and current direction and speed. Bottom trawl or other gear dimensions and characteristics are also reported. Catch statistics (e.g., weight, volume, number of fish per unit volume) may be reported for both total haul and for individual species. Biological characteristics of selected specimens, predator/ prey information (from stomach contents analysis), and growth data may also be included. A text record is available for comments. The F132 contains data from field sampling or surveys of bottom dwelling marine organisms. The data provide information on species abundance, distribution, and biomass; they may have been collected by point sampling (grab or core), by tow (dredge, trawl or net), by photographic surveys, or by other methods. Cruise information such as vessel, start and end dates, investigator, and institution/agency; station numbers, positions and times; and equipment and methods are reported for each survey. Environmental data reported at each sampling site may include meteorological and sea surface conditions; surface and bottom temperature, salinity and dissolved oxygen; and sediment characteristics. Number of individual organisms and total weight of organisms is reported for each species. A text record is available for comments. The F144 contains data on ambient concentrations of toxic substances and other pollutants in the marine environment. The data derive from laboratory analyses of samples of water, sediment, or marine organisms. Samples may have been collected near marine discharge sites or during ocean monitoring surveys of large areas. Field observations of tar deposits on beaches may also be reported. Survey information includes platform type, start and end dates, and investigator and institution. If data are collected near a discharge site, discharge location, depth, distance to shore, average volume, and other characteristics are reported. Position, date, time and environmental conditions are reported for each sample station. Environmental data may include meteorological and sea surface conditions, tide stage and height, depth of the thermocline or mixed layer surface temperature and salinity, and wave height and periods. Sample characteristics, collection methods, and laboratory techniques are reported for each sample collected and analyzed. The data record comprises concentration values (or a code to indicate trace amounts) for each chemical substance analyzed. Chemical substances are identified by codes based on the registry numbers assigned by the Chemical Abstracts Service (CAS) of the American Chemical Society. Marine organisms from which samples have been taken are identified using the 12-digit NODC Taxonomic Code. A text record is available for optional comments. This dataset is available to the public for a wide variety of uses including scientific research and analysis. completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:9500088 Graphic not available. PNG 9500088 NCEI ACCESSION NUMBER 1995-06-21 publication adenosine triphosphate AIR TEMPERATURE AIR TEMPERATURE - DRY BULB AIR TEMPERATURE - WET BULB AMMONIA (NH3) BAROMETRIC PRESSURE BEACH TAR BEACH TAR - AREA SAMPLED BEACH TAR - BEACH STATUS BEACH TAR - INTERTIDAL DISTANCE BEACH TAR - LENGTH OF SHOREFRONT BEACH TAR - SEASHORE SURFACE BEACH TAR - WATERLINE TO SAMPLE DISTANCE BOTTOM TYPE CARBON - TOTAL UPTAKE CAS (CHEMICAL ABSTRACTS SERVICE) PARAMETER CODES CATCH STATISTICS CATCH STATISTICS - AVERAGES CATCH STATISTICS - DETAILS CHLOROPHYLL CHLOROPHYLL - RELATIVE FLUORESCENCE cloud amount/frequency cloud type CURRENT DIRECTION CURRENT SPEED DISSOLVED ORGANIC CARBON DISSOLVED OXYGEN DYNAMIC DEPTH ANOMALY EFFLUENT - DISCHARGE DESCRIPTION EFFLUENT - DISCHARGE DISTANCE TO SHORE EFFLUENT - DISCHARGE IDENTIFIER EFFLUENT - DISCHARGE POINT EFFLUENT - DISCHARGE PRIMARY INDUSTRY EFFLUENT - DISCHARGE QUANTITY EFFLUENT - ZONE OF INITIAL DILUTION ELECTRON TRANSPORT SYSTEM FISHERY SURVEY FISHERY SURVEY - FISHING DURATION HYDROCARBONS - TOTAL RECOVERABLE HYDROCARBONS - TOTAL RESOLVED INDIVIDUAL FISH EXAMINATION - AGE INDIVIDUAL FISH EXAMINATION - LENGTH INDIVIDUAL FISH EXAMINATION - SEX INDIVIDUAL FISH EXAMINATION - WEIGHT NANOPLANKTON - CARBON UPTAKE NANOPLANKTON - CHLOROPHYLL NITRATE NITRATE/NITRITE RATIO NITRITE OXYGEN OXYGEN - APPARENT UTILIZATION (AOU) OXYGEN - PERCENT SATURATION PARTICULATE MATTER - DRY WEIGHT PARTICULATE ORGANIC CARBON PARTICULATE ORGANIC NITROGEN (PON) pH PHAEOPHYTIN phosphate PHOSPHORUS - ORGANIC IN PHOSPHATE PHOSPHORUS - TOTAL IN PHOSPHATE SALINITY SALINITY - BOTTOM WATER SALINITY - SURFACE WATER SEA DIRECTION SEA HEIGHT SEA STATE SEA SURFACE TEMPERATURE Secchi depth SEDIMENTS - ORGANIC CARBON SEDIMENTS - PARTICLE SIZE FRACTIONS SEDIMENTS - TOTAL CARBON SIGMA-T silicate SILICON DIOXIDE SOUND VELOCITY SPECIES IDENTIFICATION - ASH-FREE WEIGHT SPECIES IDENTIFICATION - COUNT SPECIES IDENTIFICATION - LIFE STAGE SPECIES IDENTIFICATION - SEX SPECIES IDENTIFICATION - WET WEIGHT Sulfate (SO4 2-) suspended solids SWELL DIRECTION SWELL HEIGHT TAXONOMIC CODE THERMOCLINE DEPTH TIDE HEIGHT TIDE STAGE TOTAL PHOSPHORUS turbidity VISIBILITY WATER COLOR water depth WATER DEPTH - AVERAGE WATER TEMPERATURE WATER TRANSPARENCY WAVE HEIGHT WAVE PERIOD WEATHER WIND DIRECTION WIND DIRECTION - PREVAILING WIND FORCE WIND SPEED ZOOPLANKTON BIOMASS theme NODC DATA TYPES THESAURUS bottle current meter hydrometer laboratory analysis meteorological sensor net oxygen sensor pH sensor salinometer Secchi disk sediment sampler - corer sediment sampler - grab thermometer tide gauge visual analysis instrument NODC INSTRUMENT TYPES THESAURUS benthic biological chemical laboratory analyses meteorological physical phytoplankton abundance profile site samples surface measurements survey survey - biological tows trawl water chemistry theme NODC OBSERVATION TYPES THESAURUS J. W. POWELL platform NODC PLATFORM NAMES THESAURUS Texas A&M University dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS Texas A&M University dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS GULF OF MEXICO OFFSHORE OPERATIONS MONITORING EXPERIMENT (GOOMEX) project NODC PROJECT NAMES THESAURUS Gulf of Mexico place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian EARTH SCIENCE > AGRICULTURE > AGRICULTURAL AQUATIC SCIENCES > FISHERIES EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE > SURFACE TEMPERATURE > AIR TEMPERATURE EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND DIRECTION EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS > SURFACE WINDS > WIND SPEED EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD TYPES EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > SURFACE SALINITY EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > WATER DEPTH EARTH SCIENCE > OCEANS > MARINE SEDIMENTS EARTH SCIENCE > OCEANS > OCEAN ACOUSTICS > ACOUSTIC VELOCITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > HYDROCARBONS EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRITE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITROGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PHOSPHATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SILICATE EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > SUSPENDED SOLIDS EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS EARTH SCIENCE > OCEANS > OCEAN OPTICS EARTH SCIENCE > OCEANS > OCEAN OPTICS > OCEAN COLOR EARTH SCIENCE > OCEANS > OCEAN OPTICS > SECCHI DEPTH EARTH SCIENCE > OCEANS > OCEAN OPTICS > TURBIDITY EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > THERMOCLINE EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE EARTH SCIENCE > OCEANS > OCEAN WAVES > SEA STATE EARTH SCIENCE > OCEANS > OCEAN WAVES > SWELLS EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE HEIGHT EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE PERIOD EARTH SCIENCE > OCEANS > OCEAN WAVES > WAVE SPEED/DIRECTION EARTH SCIENCE > OCEANS > SALINITY/DENSITY > DENSITY EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY EARTH SCIENCE > OCEANS > TIDES EARTH SCIENCE > OCEANS > TIDES > TIDAL HEIGHT theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian CURRENT METERS GRAB SAMPLERS HYDROMETERS > HYDROMETERS NETS > NETS OXYGEN METERS > OXYGEN METERS PH METERS > PH METERS SALINOMETERS SECCHI DISKS > SECCHI DISKS SEDIMENT CORERS > SEDIMENT CORERS THERMOMETERS > THERMOMETERS TIDE GAUGES > TIDE GAUGES instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian J. W. POWELL (call sign: WBA4695, ICES code: 32UK) platform ICES/SeaDataNet Ship Codes OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO place Global Change Master Directory (GCMD) Location Keywords 2026 revision 24 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian accessLevel: public otherRestrictions Cite as: Wolff, Gary A.; Texas A&M University (2002). Marine chemistry, fish / shell-fish surveys, benthic organisms, and marine toxic substances and pollutants data from current meter and other instruments in the Gulf of Mexico from 1993-01-26 to 1994-06-13 (NCEI Accession 9500088). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/9500088. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. eng; USA utf8 environment oceans economy climatologyMeteorologyAtmosphere biota -96.2 -96.2 27.7 27.7 1993-01-26 1994-06-13 Note: Metadata for this accession were extracted from a legacy database maintained by the U.S. National Oceanographic Data Center (NODC). The design of the database did not exactly reflect the FGDC Content Standard for Digital Geospatial Metadata (CSDGM). Principal Investigator (PI) and organization contact information accurately represents all available information from the legacy database at the time that this description was created. However, proper attribution of a PI to a specific institution or the role (submitting or collecting) taken by an institution may not be correct due to inexact mapping between fields in the legacy database and the CSDGM. Due to this uncertainty, the contact information was initially recorded in the Supplemental Information element of the CSDGM description. To develop more accurate metadata, NCEI reviews metadata for all accessions on an ongoing basis. Points of contact for this data set include: Contact info: Agency: TEXAS A&M UNIVERSITY PI: Wolff, Dr. Gary Address: address: NOT AVAILABLE city: COLLEGE STATION state: TX postal: 77843-3146 country: UNITED STATES NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. F069 MULDARS Marine Chemistry Data Format (F069) F123 MULDARS Fish/Shell-fish Surveys Data Format (F123) F132 MULDARS Benthic Organisms Data Format (F132) F144 MULDARS Marine Toxic Substances and Pollutants Data Format (F144) 4.86 https://www.ncei.noaa.gov/archive/accession/9500088 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/oas/9500088 HTTPS Web browser Descriptive Information Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/archive/accession/download/9500088 HTTPS Web browser HTTPS Navigate directly to the URL for data access and direct download. download ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0001/9500088/ FTP Any FTP client FTP These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP). download dataset NCEI Accession 9500088 v1.1 was published. 2002-11-19T19:40:22Z NCEI Accession 9500088 v1.1 publication https://www.ncei.noaa.gov/archive/accession/9500088/1.1 HTTPS NCEI Accession 9500088 v1.1 published 2002-11-19T19:40:22Z download repository NOAA National Centers for Environmental Information NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. 2015-04-22T00:00:00 asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian bottle bottle any type of water bottle sampling device Generic name for water collection device; usually used to determine temperature, salinity and provide water aliquots for measurement of a wide range of parameters; often referred to by a specific type of water sampling bottle, such as a Nansen or Niskin bottle. current meter current meter current meter hydrometer hydrometer a device for measuring seawater density laboratory analysis laboratory analysis use as an observation type meteorological sensor meteorological sensor Any meteorological sensor, but also see specific instruments such as aerovane, anemometer, etc. net net net oxygen sensor oxygen sensor Any instrument that measures oxygen content in a compound. pH sensor pH sensor generic meter used to measure pH Any of a class of instruments used to quantify pH in a water or other type of sample. salinometer salinometer generic salinometer use salinometer when the instrument type used is unclear but the data include salinity measurements Secchi disk Secchi disk The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity. [Wikipedia, 2021-09-02] sediment sampler - corer sediment sampler - corer sediment coring device gravity or other coring device used to collect surfacial and near-surficial sediment samples sediment sampler - grab sediment sampler - grab grab sampler is used to take a sample of surficial seafloor sediments thermometer thermometer generic thermometer or reversing thermometer use thermometer when temperature is a data type, but the exact instrument used to measure temperature is unknown tide gauge tide gauge a device to measure the tidal height visual analysis visual analysis visual analysis and measurement of sample materials use visual analysis with observation types of visual estimate and/or visual observation J. W. POWELL WBA4695 USGS owned