Digital Raster Graphic (DRG) image of U.S. Geological Survey standard series topographic map of Rincon, Puerto Rico (rincon_drg.tif)

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Frequently anticipated questions:

What does this data set describe?

Title:
Digital Raster Graphic (DRG) image of U.S. Geological Survey standard series topographic map of Rincon, Puerto Rico (rincon_drg.tif)
Abstract:
The Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic map including the collar information, georeferenced to the UTM grid. This version of the Digital Raster Graphic (DRG) has been clipped to remove the collar (white border of the map) and has been reprojected to geographic coordinates.
  1. How might this data set be cited?
    U.S. Geological Survey, 2007, Digital Raster Graphic (DRG) image of U.S. Geological Survey standard series topographic map of Rincon, Puerto Rico (rincon_drg.tif): Open-File Report 2007-1017, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Thieler, E.R., Rodriguez, R.W., and Himmelstoss, E.A., 2007, Historical Shoreline Changes at Rincon, Puerto Rico, 1936-2005: Open-File Report 2007-1017, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -67.271059
    East_Bounding_Coordinate: -67.124127
    North_Bounding_Coordinate: 18.373586
    South_Bounding_Coordinate: 18.247425
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 01-Jul-1966
    Currentness_Reference:
    unknown
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote-sensing image
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 6742 x 7852 x 1, type Pixel
    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 Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
  7. How does the data set describe geographic features?
    Band_1
    Panchromatic pixel values from 0-255 (Source: U.S. Geological Survey)
    ObjectID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Value
    Color index value (0-12) referencing a color palette of RGB values from 0 through 255. (Source: U.S. Geological Survey) information unavailable from original metadata
    Red
    Pixel value for red color palette (Source: U.S. Geological Survey) information unavailable from original metadata
    Green
    Pixel value for green color palette (Source: U.S. Geological Survey) information unavailable from original metadata
    Blue
    Pixel value for blue color palette (Source: U.S. Geological Survey) information unavailable from original metadata
    Opacity
    Transparency setting (Source: U.S. Geological Survey) information unavailable from original metadata
    Count
    Total count of value in image (Source: U.S. Geological Survey) information unavailable from original metadata
    Entity_and_Attribute_Overview:
    Each raster entity or pixel contains a color index from 0 through 12 referencing a color palette of RGB values from 0 through 255 in which the standard colors used in the DRG are defined.
    (In ArcView set Color 255 to transparent to eliminate the black thin border.)
    USGS DRG Color Palette
    Digital Number Color Red Green Blue
    0 Black 0 0 0 1 white 255 255 255 2 Blue 0 151 164 3 Red 203 0 23 4 Brown 131 66 37 5 Green 201 234 157 6 Purple 137 51 128 7 Yellow 255 234 0 8 Light Blue 167 226 226 9 Light Red 255 184 184 10 Light Purple 218 179 214 11 Light Grey 209 209 209 12 Light Brown 207 164 142
    Entity_and_Attribute_Detail_Citation: Draft Standards for Digital Raster Graphic.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    DRGs were produced through an Innovative Partnership agreement between The Land Information Technology Company, Ltd., of Aurora, CO and the USGS.
  3. To whom should users address questions about the data?
    E.R. Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.gov

Why was the data set created?

A DRG is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of DLG data. DRG's can also be merged with other digital data, e.g. DEM's or DOQ's, to produce a hybrid digital file. The clipped version of the DRG is useful when working with areas that are within two adjacent quadrangles.

How was the data set created?

  1. From what previous works were the data drawn?
    topo maps (source 1 of 2)
    U.S. Geological Survey, 19970627, USGS Topographic map, 7.5 series: USGS Topographic map 7.5 series, U.S. Geological Survey National Center, Reston, VA.

    Other_Citation_Details: MRC Code = 18067-C2 GNIS CellID=37942
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 20000
    Source_Contribution: The source map is scanned to produce the DRG.
    DRG (source 2 of 2)
    U.S. Geological Survey, 1997, USGS Digital Raster Graphic for Puerto Rico.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 20000
    Source_Contribution:
    The DRG was projected and clipped to generate this version in the state plane coordinate system, NAD83 without the DRG white border
  2. How were the data generated, processed, and modified?
    Date: 03-Apr-2003 (process 1 of 3)
    The production procedures, instrumentation, hardware, and software used in the collection of standard DRG products vary depending on systems used at the contract, cooperator or USGS production sites. The majority of DRG data sets are acquired through government contract. The process step describes, in general, the process used in the production of standard DRG data sets.
    1. Production of a DRG begins with the scanning of a paper 7.5-minute topographic map (map1) on a high-resolution scanner. Scanning resolutions range from 500 - 1000 dpi with the output file running between 160-300 mb.
    2. Removal of screens (descreening) and color quantization to reduce the number of colors also takes place during the scanning phase.
    3. The raw scan file is then transformed and georeferenced using UTM coordinates of the sixteen 2.5-minute grid ticks, which are obtained using the in-house produced program COORDAT and stored in a ground control file. Those sixteen 2.5-minute ticks are interactively visited and assigned their respective UTM coordinates. USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation.
    4. An output resolution of 2.4 meters (8.2 feet) is chosen in order to resample the file to 250 dpi.
    5. The image file is converted to a TIFF and further reduced by converting the file to a run length encoding Packbits compression(type 32773).
    6. The color palette of the compressed DRG is then standardized by replacing the original RGB values assigned during the scanning process with standard RGB value combinations using the in-house produced TIFFREMAP program.
    7. Prior to archiving the DRG undergoes the following quality assurance procedures:
    a. The color index values of each DRG are checked to ensure the RGB combinations are consistent with the standardized color palette.
    b. All DRG files are inspected to ensure that they are geometrically consistent with normal map presentation.
    c. Selected DRG's are checked to ensure that data elements in the DRG metadata file correspond to the map collar information and to the information in the associated image file.
    d. Selected DRG's are checked for georeferencing accuracy by comparing the book value of latitude and longitude tick marks with corresponding tick intersections in the DRG image.
    e. Transformations are checked on selected DRG's by comparing the positions of well defined points, such as UTM grid intersections in the graphic product, with the corresponding image points in the DRG.
    f. The original DRG was then projected from UTM to the state plane coordinate system (Lambert Conformal Conic projection)NAD27 and then reprojected to the NAD83 DATUM. The white border was clipped using the ESRI Arc/Info software, the projection and clip processes were done by the USGS Caribbean District.
    Date: unknown (process 2 of 3)
    Data were projected from NAD83 state plane coordinate system to NAD83 geographic.
    Tool: ArcGIS > ArcToolbox > Toolboxes > Data Management Tools > Project Person who carried out this activity:
    Emily Himmelstoss
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2262 (voice)
    508-457-2310 (FAX)
    ehimmelstoss@usgs.gov
    Date: 19-Aug-2021 (process 3 of 3)
    The metadata was edited to remove errors as well as update some information. Edits include updating the citation section with the DOI link and a slight modification to the dataset title, added the USGS Thesaurus, added keywords section with USGS persistent identifier as theme keyword, replaced distribution liability with FSP statement. Other unrequired blank fields were deleted, duplicate entries within a field were deleted, required empty elements were fixed with “information unavailable from original metadata”. The latitude and longitude resolution were absent, and require values, so the values were added but not verified. The metadata date (20070223), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    The DRG is an 8-bit color image that employs a color palette to ensure uniform colors throughout a particular DRG series. All DRG's within a series must have the same RGB value.
  2. How accurate are the geographic locations?
    While the datum of the published map is retained, this image was originally cast on the state plane coordinate system, then reprojected to geographic coordinates and may therefore be INCONSISTENT with the credit note on the image collar. While the datum of the published map is retained, this image was originally cast on the state plane coordinate system, then reprojected to geographic coordinates and may therefore be INCONSISTENT with the credit note on the image collar.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The DRG is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the DRG due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. Data completeness for DRG files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints. For information on collection and inclusion criteria, see U.S. Geological Survey, 1994, Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps: National Mapping Program Technical Instructions and U.S. Geological Survey, 1994, Standards for Digital Line Graphs: National Mapping Program Technical Instructions.
    Additional useable data exists in this area and can be found in the list of clipped DRGs for Puerto Rico Quadrangles (7.5 series 1:20,000) below:
    QUADRANGLE (PUBLICATION DATE) - FILE NAME ADJUNTAS (1960) - ADDRG83.TIF AGUADILLA (1960) - AGDRG83.TIF AGUAS_BUENAS (1982) - ABDRG83.TIF ARECIBO (1982) - ARDRG83.TIF BARCELONETA (1982) - BTDRG83.TIF BARRANQUITAS (1982) - BRDRG83.TIF BAYAMON (1982) - BMDRG83.TIF BAYANEY (1982) - BYDRG83.TIF CABO_ROJO (1966) - CBDRG83.TIF CAGUAS (1982) - CGDRG83.TIF CAMUY (1982) - CMDRG83.TIF CAROLINA (1982) - CRDRG83.TIF CAYEY (1982) - CYDRG83.TIF CAYO_ICACOS (1958) - CCDRG83.TIF CENTRAL_AGUIRRE (1982) - CADRG83.TIF CENTRAL_LA_PLATA (1964) - CPDRG83.TIF CIALES (1982) - CLDRG83.TIF COAMO (1972) - CSDRG83.TIF COMERIO (1982) - CODRG83.TIF COROZAL (1972) - CZDRG83.TIF CULEBRA (1948) - CUDRG83.TIF EL_YUNQUE (1982) - EYDRG83.TIF FAJARDO (1982) - FADRG83.TIF FLORIDA (1957) - FLDRG83.TIF GUANICA (1966) - GADRG83.TIF GUAYAMA (1982) - GMDRG83.TIF GURABO (1982) - GRDRG83.TIF HUMACAO (1982) - HUDRG83.TIF ISABELA (1960) - ISDRG83.TIF JAYUYA (1982) - JADRG83.TIF JUNCOS (1982) - JUDRG83.TIF MANATI (1982) - MNDRG83.TIF MARICAO (1960) - MRDRG83.TIF MAYAGUEZ (1964) - MADRG83.TIF MOCA (1964) - MCDRG83.TIF MONA (1944) - MODRG83.TIF MONTE_GUILARTE (1960) - MGDRG83.TIF NAGUABO (1982) - NGDRG83.TIF NARANJITO (1982) - NJDRG83.TIF OROCOVIS (1982) - ORDRG83.TIF PARGUERA (1966) - PEDRG83.TIF PATILLAS (1982) - PADRG83.TIF PENUELAS (1982) - PSDRG83.TIF PLAYA_DE_PONCE (1982) - PLDRG83.TIF PONCE (1982) - PODRG83.TIF PUERTO_REAL(1966) - PRDRG83.TIF PUNTA_CUCHARA (1982) - PCDRG83.TIF PUNTA_GUAYANES (1982) - PGDRG83.TIF PUNTA_PUERCA (1982) - PPDRG83.TIF PUNTA_TUNA -(1960) PTDRG83.TIF PUNTA_VERRACO (1982) - PVDRG83.TIF QUEBRADILLAS (1972) - QUDRG83.TIF RINCON (1966) - RIDRG83.TIF RIO_DESCALABRADO (1982) - RDDRG83.TIF RIO_GRANDE (1982) - RGDRG83.TIF ROSARIO (1964) - RODRG83.TIF SABANA_GRANDE (1966) - SGDRG83.TIF SALINAS (1982) - SLDRG83.TIF SANTA_ISABEL (1982) - SIDRG83.TIF SAN_GERMAN (1966) - SNDRG83.TIF SAN_JUAN (1982) - SJDRG83.TIF SAN_SEBASTIAN (1958) - SSDRG83.TIF UTUADO (1982) - UTDRG83.TIF VEGA_ALTA (1982) - VADRG83.TIF VIEQUES (1982) - VEDRG83.TIF YABUCOA (1982) - YADRG83.TIF YAUCO (1982) - YODRG83.TIF
  5. How consistent are the relationships among the observations, including topology?
    No additional checks for topological consistency were performed on the data.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None
Use_Constraints:
Acknowledgment of the USGS would be appreciated in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    E.R. Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.

Who wrote the metadata?

Dates:
Last modified: 01-Sep-2021
Metadata author:
U.S. Geological Survey
Attn: Rolla-ESIC
National Mapping Division
1400 Independence Rd, MS231
Rolla, MO
USA

573-308-3500 (voice)
573-308-3615 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2007-1017/rincon_drg_meta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:22 2021