Archive of Digitized Analog Boomer Seismic-Reflection Data Collected in 1992 During the ERDA92-3 Survey Along the Texas-Louisiana Border Geospatial_Data_Form: SEG-Y, tabular, and raster digital data

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Frequently anticipated questions:

What does this data set describe?

Title:
Archive of Digitized Analog Boomer Seismic-Reflection Data Collected in 1992 During the ERDA92-3 Survey Along the Texas-Louisiana Border Geospatial_Data_Form: SEG-Y, tabular, and raster digital data
Abstract:
The U.S. Geological Survey (USGS) Coastal and Marine Hazards and Resources Program has actively collected geophysical and sedimentological data in the northern Gulf of America (Gulf of Mexico) for several decades, including shallow subsurface data in the form of high-resolution seismic reflection profiles (HRSP). Prior to the mid-1990s most HRSP data were collected in analog format as paper rolls of continuous profiles up to 25 meters long. As part of the National Geological and Geophysical Data Preservation Program (NGGDPP, https://www.usgs.gov/programs/national-geological-and-geophysical-data-preservation-program) scientists from the USGS St. Petersburg Coastal and Marine Science Center converted analog paper records to digital format using a large-format continuous scanner. The scanned image files were subsequently processed to fix distortions and crop out blank spaces prior to exporting them as industry standard Society of Exploration Geophysicists data exchange (SEG-Y) formatted files. This data release serves as an archive of HRSP profiles annotated with header information, converted SEG-Y files, navigation data, cruise track line Tagged Image File (.TIFF) files, and associated reports. The HRSP data was collected between August 11 and August 14, 1992, using an EG&G Uniboom acoustic system, onboard research vessel (R/V) ERDA 1. The data was collected from Sabine Lake, through Sabine Pass, and adjacent nearshore Gulf waters. Data conversion methods are described in USGS Data Series 1047 (Bosse and others, 2017). Following SPCMSC data management protocols, this survey was assigned a USGS field activity number (FAN), 1992-300-FA (alternative FAN, ERDA92-3). Additional survey and data details are available of the Coastal and Marine Geoscience Data System (CMGDS) at https://cmgds.marine.usgs.gov/services/activity.php?fan=1992-300-FA.
Supplemental_Information:
The USGS-St. Petersburg Coastal and Marine Science Center (SPCMSC) currently holds 13 major geophysical surveys from the northern Gulf of America in its paper repository. Over 2,000 line-kilometers (km) of data are available. Paper copies of data are difficult and expensive to duplicate and share with other facilities and cannot be analyzed using standard geographic information systems (GIS) and interpretative software. Conversion of this data into a usable digital format is necessary to archive the geologic information that otherwise might be lost, requiring additional redundant and expensive marine geophysical surveys. The USGS NGGDPP addresses the need to preserve, catalog, and provide access to geological and geophysical data for scientific research and economic development. In addition to the current efforts under the NGGDPP, four geophysical investigations from the 1980s and 1990s were previously archived through a preservation project in collaboration with the Bureau of Ocean Energy Management (Harrison and others, 2007; Sanford and others, 2009a, b, c). The USGS-SPCMSC scans its analog HRSP holdings using a large-format continuous scanner. The analog to digital conversion process used for this dataset is similar to the processes used previously in Harrison and others (2007) and Sanford and others (2009a, b, c). The digital files were converted into TIFF for standard accessibility by raster image processors. The TIFF images of the seismic profiles were also converted into SEG-Y format. This standard non-proprietary format is the accepted industry standard for seismic data and can be accessed by all major seismic data processing and interpretation systems. Accompanying the HRSP are navigation and metadata files, which are generated for use in GIS, database and Internet Message Access Protocol (IMAP) services. Processed seismic profile images are also provided. The processed profiles provided in this data release are Portable Document Format (PDF) images that were created using Seismic Unix and/or ImageMagick software. The northern Gulf of America is a passive continental margin, where minimal structural change to the shallow stratigraphy has occurred during the last few thousand years (Anderson and others, 2004). Therefore, subsurface data collected from this environment for the purposes of geologic assessment can be considered useful in perpetuity. The geologic information collected by the USGS in the northern Gulf remains a valuable resource for sea floor and stratigraphic investigations and is continuously revisited by researchers interested in Holocene and recent earth processes. For example, decades-old geologic data are commonly used in sediment resource studies in coastal Louisiana (Kindinger and others, 2001; Kulp and others, 2002; Rogers and others, 2009) and previously collected datasets across the Mississippi-Alabama shelf have been used in recent geologic-framework assessments (Roberts and others, 2004; Greene and others, 2007; Flocks and others, 2009). Geophysical data were acquired for the Bureau of Land Management. The survey was conducted between August 11 and August 14, 1992 on board the R/V ERDA 1. Geophysical data were acquired using an EG&G Uniboom profiler. The transducer was mounted on a towed sled using a 300-Joule power supply. Data was recorded using an EPC 4100 recorder, with a bandpass of 0.4 – 1.6 kilohertz (kHz). Navigation events, or shots, were recorded using mark events corresponding to approximately 18.75 meter (m) intervals along the planned line. Positioning was provided by long range navigation (LORAN), a hyperbolic radio navigation system with an estimated accuracy of +/-0.2 to 0.8 km.
  1. How might this data set be cited?
    Smullen, Blake F., Forde, Arnell S., and Flocks, James G., 20250911, Archive of Digitized Analog Boomer Seismic-Reflection Data Collected in 1992 During the ERDA92-3 Survey Along the Texas-Louisiana Border Geospatial_Data_Form: SEG-Y, tabular, and raster digital data:.

    This is part of the following larger work.

    Smullen, Blake F., Forde, Arnell S., and Flocks, Jim G., 20250911, Archive of Digitized Analog Boomer Seismic-Reflection Data Collected in 1992 During the ERDA92-3 Survey Along the Texas-Louisiana Border: U.S. Geological Survey data release doi:10.5066/P1EQAFLT, U.S. Geological Survey- St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -93.93683
    East_Bounding_Coordinate: -93.75970
    North_Bounding_Coordinate: 29.98112
    South_Bounding_Coordinate: 29.61950
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 11-Aug-1992
    Ending_Date: 14-Aug-1992
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (379)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    ERDA_92_3_navigation.csv
    Navigation file for the seismic data survey, containing date, time, and location of each shot point. (Source: USGS)
    Date
    Date associated with each shot (Source: USGS)
    Range of values
    Minimum:08/12/1992
    Maximum:08/15/1992
    HH
    Hour value of time that shot was recorded, in 24 hour time format (Source: USGS)
    Range of values
    Minimum:8
    Maximum:18
    MM
    Minute value of time that shot was recorded (Source: USGS)
    Range of values
    Minimum:00
    Maximum:55
    SS
    Second value of time that shot was recorded (Source: USGS)
    Range of values
    Minimum:00
    Maximum:05
    LONG_DEG
    Longitude degree value of position of vessel when shot was recorded (Source: USGS)
    Range of values
    Minimum:-93
    Maximum:-93
    LONG_DEC_MIN
    Longitude decimal minute value of position of vessel when shot was recorded (Source: USGS)
    Range of values
    Minimum:45.58
    Maximum:56.21
    LAT_DEG
    Latitude degree value of location of position of vessel when shot was recorded (Source: USGS)
    Range of values
    Minimum:29
    Maximum:29
    LAT_DEC_MIN
    Latitude decimal minute value of position of vessel when shot was recorded (Source: USGS)
    Range of values
    Minimum:37.17
    Maximum:58.87
    SHOT
    Shot number (Source: USGS)
    Range of values
    Minimum:0
    Maximum:83
    LINE_NUMBER
    Line number (Source: USGS)
    Range of values
    Minimum:1
    Maximum:23

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Blake F. Smullen
    • Arnell S. Forde
    • James G. Flocks
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    James G. Flocks
    U.S. Geological Survey
    Emeritus
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8000 (voice)
    jflocks@usgs.gov Native_Data_Set_Enviroment: Environment as of Metadata Creation: Microsoft Windows 11 Enterprise Version 23H2; Photoshop (Ps) Creative Cloud 2024; Contex Nextimage Scanning Software; Microsoft Word for Office 365 version 16; ImageToSEGY 2.2; Environmental Systems Research Institute (Esri) ArcGIS Pro 3.2.1; Seismic Unix (Relase 44).

Why was the data set created?

The data release associated with this metadata record serves as an archive of ERDA92-3 geophysical, navigational, and support data collected between August 11 and August 14, 1992. This data release is part of an ongoing USGS data rescue effort to preserve the geologic data that facilitates easier access to legacy datasets by scientists and the public.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2025 (process 1 of 6)
    Raw data scanning - The seismic data collected from this survey is housed in the USGS SPCMSC archive. The analog boomer data are in the form of 30 centimeter (cm)-wide paper and vellum rolls. The various rolls can be up to 6 m long and contain multiple seismic tracklines. The rolls contain the seismic profile image with pertinent collection characteristics annotated during acquisition, such as shot number and time and may also include environmental conditions and equipment details. Horizontal lines across the profiles represent TWT time in milliseconds (ms), and vertical lines represent navigation fixes acquired and annotated as the survey was underway. The vellum rolls were scanned using NextImage. The lines were then saved at 200 dpi (dots per inch), grey scaled, in TIFF files. Person who carried out this activity:
    Blake F. Smullen
    Cherokee Nation System Solutions, Contractor to the U.S. Geological Survey
    Student Services Contractor
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8200 (voice)
    bsmullen@contractor.usgs.gov
    Data sources produced in this process:
    • TIFF
    Date: 2025 (process 2 of 6)
    Image cropping - The scanned TIFF images were imported into Adobe Photoshop (Ps) Creative Cloud 2024 and blank edge areas were cropped out to further reduce file size. For rolls that included more than one line of seismic data, the file was separated into individual lines. Separation was completed by cropping everything except for the line of interest, determined by the raw navigation information, from the original scan and saving it as a new file with its associated line name. The file naming convention is as follows: CruiseID_trackline#_an.tif (for example, ERDA92-3_5_an.tif). It includes the cruise identification (ERDA92_3), and trackline number. Person who carried out this activity:
    Blake F. Smullen
    Cherokee Nation System Solutions, Contractor to the U.S. Geological Survey
    Student Services Contractor
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8200 (voice)
    bsmullen@contractor.usgs.gov
    Data sources used in this process:
    • TIFF
    Date: 2025 (process 3 of 6)
    Image headers - Each image of the scanned seismic profiles also includes a header with associated information including cruise- and line-specific information and processing details. The header files were created in Microsoft Word for Office 365 version 16, exported as PDF files, appended to the far left of the image frame in Adobe Photoshop, and then flattened onto the image to reduce file size. Person who carried out this activity:
    James G. Flocks
    U.S. Geological Survey
    Emeritus
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8000 (voice)
    jflocks@usgs.gov
    Data sources used in this process:
    • TIFF
    Data sources produced in this process:
    • ERDA-92-3*.tif
    Date: 2025 (process 4 of 6)
    Correcting scan distortion - Distortion correction is necessary because it is difficult to ensure vellum/paper rolls are fed into the scanner straight. Distortion correction practices occur in Ps and is obtained by placing a guideline over the 0 ms line (water level) on the scan. The distortion was corrected by using the Rectangular Marquee Tool in Adobe Ps to select and create a new layer of the distorted area of the scan. A skewed transform was performed, and the corrected images were saved into a new folder without layers (flattened) to reduce file size. Person who carried out this activity:
    Blake F. Smullen
    Cherokee Nation System Solutions, Contractor to the U.S. Geological Survey
    Student Services Contractor
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8200 (voice)
    bsmullen@contractor.usgs.gov
    Data sources used in this process:
    • ERDA-92-3*.tif
    Date: 2025 (process 5 of 6)
    Image to SEG-Y - The scanned, distortion-corrected images were converted to digital SEG-Y (the .seg file extension was used, which has the same properties as .sgy) format revision 0 (Barry and others, 1975) using the proprietary software ImageToSEGY 2.2 from Chesapeake Technology. The scanned images were opened in ImageToSEGY and the export area was defined by assigning values to the top, bottom, left, and right pixel locations using the imaged water surface (0 ms), maximum TWT time (for example, 112.5 ms) and raw navigation data for each line. Trace amplitudes in the scanned profiles are represented by pixels, so each pixel becomes a trace sample and the sample rate of the converted SEG-Y version is the record length divided by the number of vertical pixels in the profile. For example, if the profile is 4,435 pixels vertically and the two-way travel time is 112.5 ms, then the sample rate for the SEG-Y file version is 0.000025 seconds (s). The file naming convention is as follows: CruiseID_Trackline#.seg (for example ERDA_92-3_5.seg). It includes the cruise identification (ERDA92-3) and trackline number. Person who carried out this activity:
    Blake F. Smullen
    Cherokee Nation System Solutions, Contractor to the U.S. Geological Survey
    Student Services Contractor
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8200 (voice)
    bsmullen@contractor.usgs.gov
    Data sources used in this process:
    • ERDA-92-3*.tif
    Data sources produced in this process:
    • ERDA_92-3*.seg
    Date: 2025 (process 6 of 6)
    Seismic processing: The SEG-Y data were processed with Seismic Unix (SU, Release 44) software to produce PDF images of the seismic profiles included in this data release. A representative data processing sequence consisted of (1) converting the SEG-Y file to SU format, (2) applying horizontal (number of traces) and vertical (TWT time) scales and generating a PostScript image of the traces, (3) converting the header file to a PostScript image then merging with the seismic profile image, and (4) converting the merged PostScript image to a PDF file. The file naming convention is as follows: CruiseID_Trackline#.pdf (for example, ERDA-92-3_5.pdf) It includes the cruise identification (ERDA92-3) and trackline number. Person who carried out this activity:
    James G. Flocks
    U.S. Geological Survey
    Emeritus
    600 4th Street South
    St. Petersburg, FL

    (727) 502-8000 (voice)
    jflocks@usgs.gov
    Data sources used in this process:
    • SEG-Y
    Data sources produced in this process:
    • ERDA-92-3*.pdf
  3. What similar or related data should the user be aware of?
    Anderson, J.B., Rodriguez, A., Abdulah, K.C., Fillon, R.H., Banfield, L.A., McKeown, H.A., and Wellner, J.S., 20040101, Late Quaternary stratigraphic evolution of the northern Gulf of Mexico margins—A synthesis, in Anderson, J., and Fillon, R., eds., Late Quaternary stratigraphic evolution of the Northern Gulf of Mexico: Society for Sedimentary Geology 79.

    Online Links:

    Other_Citation_Details: pages 1-23
    Barry, K.M., Cavers, D.A., and Kneale, C.W., 197504, Recommended standards for digital tape formats: Geophysics v. 40, no. 2.

    Online Links:

    Other_Citation_Details: pages 344-352
    Bosse, S.T., Flocks, J.G., and Forde, A.S., 20170421, Digitized analog boomer seismic-reflection data collected during U.S. Geological Survey cruises Erda 90-1_HC, Erda 90-1_PBP, and Erda 91-3 in Mississippi Sound, June 1990 and September 1991: U.S. Geological Survey Data Series 1047.

    Online Links:

    Flocks, J.G., Ferina, N.F., and Kindinger, J.L., 2009, Recent geologic framework and geomorphology of the Mississippi-Alabama shelf, northern Gulf of Mexico, in, Buster, N.A., and Holmes, C.W., eds., Gulf of Mexico origin, waters, and biota: Volume III, Geology: College Station, Texas, Texas A&M University Press 3.

    Online Links:

    Other_Citation_Details: pages 157-173
    Greene, D.L., Jr., Rodriquez, A.B., and Anderson, J.B., 20070201, Seaward-branching coastal-plain and piedmont incised-valley systems through multiple sea-level cycles: Late Quaternary examples from Mobile Bay and Mississippi Sound, U.S.A.: Journal of Sedimentary Research 77.

    Online Links:

    Other_Citation_Details: pages 139-158
    Harrison, A.S., Dadisman, S.V., Kindinger, J.L., Morton, R.A., Blum, M.D., Wiese, D.S., and Subino, J.A., 2007, Archive of digital and digitized analog boomer seismic reflection data collected during USGS cruise 96CCT02 in Copano, Corpus Christi, and Nueces Bays and Corpus Christi Bayou, Texas, July 1996: U.S. Geological Survey Data Series 296.

    Online Links:

    Kindinger, J.L., Flocks, J.G., Kulp, M.A., Penland, P.S., and Britsch, L.D., 2001, Sand resources, regional geology, and coastal processes for the restoration of the Barataria barrier shoreline: U.S. Geological Survey Open-File Report 2001-384.

    Online Links:

    Other_Citation_Details: 69 pages
    Kulp, M.A., Howell, P.D., Adiau, S., Penland, P.S., Kindinger, J.L., and Williams, S.J., 2002, Latest Quaternary stratigraphic framework of the Mississippi River delta region: Gulf Coast Association of Geological Societies Transactions 52.

    Online Links:

    Other_Citation_Details: pages 573-582
    Roberts, H.H., Fillon, R.H., Kohl, B., Robalin, J.M., and Sydow, J.C., 2004, Depositional architecture of the Lagniappe Delta: Sediment characteristics, timing of depositional events, and temporal relationship with adjacent shelf-edge deltas, in Anderson, J.B., and Fillon, R., eds., Late Quaternary stratigraphic evolution of the northern Gulf of Mexico: Society for Sedimentary Geology 79.

    Online Links:

    Other_Citation_Details: pages 142-189
    Rogers, B.E., Kulp, M.A., and Miner, M.D., 20090916, Late Holocene chronology, origin, and evolution of the St. Bernard shoals, northern Gulf of Mexico, USA: Geo-Marine Letters 29.

    Online Links:

    Other_Citation_Details: pages 379-394
    Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G., 2009, Archive of digitized analog boomer seismic reflection data collected from the Mississippi-Alabama-Florida shelf during cruises onboard the R/V Kit Jones, June 1990 and July 1991: U.S. Geological Survey Data Series 429.

    Online Links:

    Other_Citation_Details: 2009a
    Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G., 2009, Archive of digitized analog boomer and minisparker seismic reflection data collected from the Alabama-Mississippi-Louisiana shelf during cruises onboard the R/V Carancahua and R/V Gyre, April and July, 1981: U.S. Geological Survey Data Series 428.

    Online Links:

    Other_Citation_Details: 2009b
    Sanford, J.M., Harrison, A.S., Wiese, D.S., and Flocks, J.G., 2009, Archive of digitized analog boomer seismic reflection data collected from Lake Pontchartrain, Louisiana, to Mobile Bay, Alabama, during cruises onboard the R/V ERDA-1, June and August 1992: U.S. Geological Survey Data Series 370.

    Online Links:

    Other_Citation_Details: 2009c

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The validity or accuracy of boomer seismic profiling data is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show any major anomalies.
  2. How accurate are the geographic locations?
    As the seismic reflection data were acquired, the position of the vessel was recorded using a LORAN-A navigation system. The accuracy of the LORAN-A varied from 0.2 to 0.8 km. Positions were recorded in latitude and longitude coordinates at various intervals and appear on the seismic profiles as incremental, hand-annotated vertical event marks. Each vertical line represents a 305m or 1000-foot (ft) interval. For this cruise, the time between starting and ending times were interpolated.
  3. How accurate are the heights or depths?
    These data are not to be used for bathymetry. Two-way travel (TWT) times shown on the printable profile images are relative to local sea level at the time of data acquisition.
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented. All analog seismic profiles collected during the original survey were successfully scanned and converted to digital format. The seismic profiles provide a two-dimensional (2D) representation of the subsurface along the acquisition tracklines. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    This dataset is from the USGS SPCMSC archive and has consistent instrument calibrations.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints No access constraints. Please see 'Distribution Information' for details.
Use_Constraints These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
    Attn: USGS SPCMSC Data Management
    600 4th Street South
    Saint Petersburg, FL
    United States

    727-502-8000 (voice)
    gs-g-spcmsc_data_inquiries@usgs.gov
    Contact_Instructions:
    This data release is available online in its entirety. The SEG-Y files are downloadable from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/.
  2. What's the catalog number I need to order this data set? ERDA92-3*.seg, ERDA92-3*.pdf, ERDA92-3*.tif, ERDA92-3_navigagtion.csv
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The SEG-Y rev. 0 format (Barry and others, 1975) presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an American Standard Code for Information Interchange (ASCII) header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header. in format SEG-Y Size: 530
      Network links: https://coastal.er.usgs.gov/data-release/doi-P1EQAFLT/data/ERDA92-3_SEGY.zip
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    Use of SEG-Y data requires specialized seismic processing software, such as public domain software Seismic Unix (https://github.com/JohnWStockwellJr/SeisUnix).

Who wrote the metadata?

Dates:
Last modified: 11-Sep-2025
Metadata author:
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Attn: USGS SPCMSC Data Management
600 4th Street South
St. Petersburg, FL

(727) 502-8200 (voice)
gs-g-spcmsc_data_inquiries@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/ERDA92-3_Metadata.faq.html>
Generated by mp version 2.9.51 on Thu Sep 11 09:35:29 2025