CAPE_GEOLGEOG: Digital Cape Cod and the Islands Geologic Map

Frequently-anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

Title: CAPE_GEOLGEOG: Digital Cape Cod and the Islands Geologic Map

Abstract:

These data represent a digital form of the geologic map of Cape Cod and the islands.

1. How should this data set be cited?

   Cross, VeeAnn A. , 2004, CAPE_GEOLGEOG: Digital Cape Cod and the Islands Geologic Map:.

   Online Links:

   • <http://pubs.usgs.gov/of/2003/of03-221/data/basemaps/cape_cod_geology/cape_cod_geology.zip>

   This is part of the following larger work.

   Hallett, B.W., Paskevich, V.F., Poppe, L.J., Brand, S.G., and Blackwood, D.S., 2004, A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts: Open-File Report 03-001, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

   Online Links:

   • <http://pubs.usgs.gov/of/2003/of03-221>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -70.949375

   East_Bounding_Coordinate: -69.926684

   North_Bounding_Coordinate: 42.083040

   South_Bounding_Coordinate: 41.238200

3. What does it look like?

   cape_geolgeog (GIF)

   Overview of the geologic map of Cape Cod.

4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 1986

   Currentness_Reference: publication date

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: vector digital data

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (848)

   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 0.000000. Longitudes are given to the nearest 0.000000. 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?

   cape_geolgeog

   Shapefile Attribute Table (Source: ESRI)

   FID

   Internal feature number. (Source: ESRI)

   Sequential unique whole numbers that are automatically generated.

   Shape

   Feature geometry. (Source: ESRI)

   Coordinates defining the features.

   ID

   software generated value (Source: ESRI)

   GEOLUNIT

   Geologic unit abbreviation. (Source: Original map publishers - Oldale and Barlow)

   character data set

   GEOLDESC

   Brief description of the geologic unit. (Source: Condensed from the original unit descriptions appearing on the paper map by Oldale and Barlow.)

   character data set

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • VeeAnn A. Cross

2. Who also contributed to the data set?

3. To whom should users address questions about the data?

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

This shapefile is provided as a digital representation of the original paper geologic map: Geologic map of Cape Cod and the Islands, Massachusetts. See source contribution for detailed citation.

1. From what previous works were the data drawn?

   (source 1 of 1)

   Oldale, Robert N. , and Barlow, Roger A. , 1986, Geologic map of Cape Cod and the Islands, Massachusetts: Miscellaneous Investigations Series Map I-1763, U.S. Geological Survey, Reston, VA.

2. How were the data generated, processed, and modified?

   (process 1 of 11)

   The original paper map was scanned and converted to a TIFF image using a large format scanner in Reston, VA.

   Person who carried out this activity:
   

   Dave Foster
   U.S. Geological Survey
   Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2271 (voice)
   (508) 457-2310 (FAX)
   dfoster@usgs.gov
   

   (process 2 of 11)

   This original TIFF image was then registered using BlueMarble geographic transformer software. This original georeferencing was based on the UTM, zone 19, NAD27 tic marks available on the map.

   Person who carried out this activity:
   

   Dave Foster
   U.S. Geological Survey
   Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2271 (voice)
   (508) 457-2310 (FAX)
   dfoster@usgs.gov
   

   (process 3 of 11)

   This UTM, Zone 19, NAD27 image was then reprojected using BlueMarble geographic transformer to UTM, Zone 19, NAD83.

   Person who carried out this activity:
   

   Dave Foster
   U.S. Geological Survey
   Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2271 (voice)
   (508) 457-2310 (FAX)
   dfoster@usgs.gov
   

   (process 4 of 11)

   Using this UTM, NAD83 image as a backdrop, the geologic contacts were heads up digitized in ESRI's ArcMap, 8.2 software.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 5 of 11)

   Attributes reflecting the information recorded on the original geologic map were added to the shapefile.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 6 of 11)

   Within ArcView 3.2, the avenue script calcapl.ave was run on the shapefile to help identify sliver polygons.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 7 of 11)

   Due to the large number of sliver polygons, the decision was made to convert the shapefile to a coverage using the ArcInfo command shapearc. A subclass was specified so that the attribute information already in the shapefile would be carried over to the coverage.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 8 of 11)

   Once the shapefile was in a coverage, CLEAN was run on the coverage with a fuzzy tolerance of 1 and a dangle tolerance of 0.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 9 of 11)

   This polygon coverage was then converted back to a shapefile with unnecessary attribute columns deleted.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 10 of 11)

   Polygons with small areas were looked at more closely to see if any larger sliver polygons escaped the clean process. Those that did escape were merged with the adjacent larger polygons of the same geologic unit.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   (process 11 of 11)

   Once the shapefile was cleaned and edits were complete, the UTM projected shapefile was projected to geographic coordinates.

   Person who carried out this activity:
   

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Road
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

   Data sources produced in this process:

   • cape_geolgeog.dbf
   • cape_geolgeog.shp
   • cape_geolgeog.shx

3. What similar or related data should the user be aware of?

   Oldale, Robert N. , and Barlow, Roger A. , 1986, Geologic Map of Cape Cod and the Islands, Massachusetts: Miscellaneous Investigations Series Map I-1763, U.S. Geological Survey.

1. How well have the observations been checked?

2. How accurate are the geographic locations?

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

5. How consistent are the relationships among the observations, including topology?

   No additional checks for topological consistency were performed on the data.

Are there legal restrictions on access or use of the data?

Access_Constraints: None.

Use_Constraints:

Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution.

Please recognize the U.S. Geological Survey (USGS) as the source of this information. Please cite the source map as: Geologic Map of Cape Cod and the Islands, Massachusetts, 1986, Robert N. Oldale, Roger A. Barlow: Miscellaneous Investigations Series, Map I-1763.

1. Who distributes the data set? (Distributor 1 of 1)

   VeeAnn A. Cross
   U.S. Geological Survey
   Marine Geologist
   384 Woods Hole Rd.
   Woods Hole, MA 02543-1598
   USA
   

   (508) 548-8700 x2251 (voice)
   (508) 457-2310 (FAX)
   vatnipp@usgs.gov
   

2. What's the catalog number I need to order this data set?

   Downloadable Data: cape_geolgeo.shp

3. What legal disclaimers am I supposed to read?

   Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	Size: 1.266

   • Cost to order the data:

5. What hardware or software do I need in order to use the data set?

   The data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS® or ArcView® 3.0 or greater software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing data. A free viewer, ArcExplorer, is also available from the ESRI website at www.esri.com/software/arcexplorer/download4.html.

Dates:

Last modified: 07-Feb-2004

Metadata author:

VeeAnn A. Cross
U.S. Geological Survey
Marine Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2251 (voice)
(508) 457-2310 (FAX)
vatnipp@usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)