Geologic Map of the Cobblestone Creek - May Creek Area, Brooks Range Foothills, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Geologic Map of the Cobblestone Creek - May Creek Area, Brooks Range Foothills, Alaska
Abstract:
This dataset is comprised of a vector topographic base map illustrating the Chandler Lake B-1 and C-1 1:63,360 quadrangles.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Layers include:
pt_elevations point elevationsfor the Chandler lake B-1 and C-1 1:63,360 scale Quadrangles
contours topographic contour lines for the Chandler lake B-1 and C-1 1:63,360 scale Quadrangles
section_gridsection grid
township_range_gridtownship and range grid
manmadeinfrastructures such as roads, airstrips, etc.
wells well locations
hydrology_lines hydrologic line features such as rivers
hydrology_polygons hydrologic polygon features such as lakes
  1. How should this data set be cited?

    Delaney, P.R., 2009, Geologic Map of the Cobblestone Creek - May Creek Area, Brooks Range Foothills, Alaska: Preliminary Interpretive Report PIR 2009-5, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Other_Citation_Details: 40 pages, 1 sheet, 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -150.65249
    East_Bounding_Coordinate: -149.93296
    North_Bounding_Coordinate: 68.75955
    South_Bounding_Coordinate: 68.24027

  3. What does it look like?

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

    Calendar_Date: 2006
    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?

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -153.000000
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000064
      Ordinates (y-coordinates) are specified to the nearest 0.000064
      Planar coordinates are specified in meters

      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    contours.shp
    Object type is vector polylines.Entity values refer to lines connecting points of equal elevation (contour lines) (Source: Alaska Division of Geological & Geophysical Surveys)

    Elevation
    Elevation of contour line (Source: Elevations are from DEM grid contoured and exported from Surfer software.)

    Range of values
    Minimum:1400
    Maximum:7500

    manmade.shp
    Object type is vector.Entity values refer to infrastructure such as airstrips, roads, etc. (Source: Alaska Division of Geological & Geophysical Surveys)

    type
    Type of infrastructure. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    accessXX
    airstripairstrip

    pt_elevations.shp
    Object type is point.The entity values refer to point elevations digitized from the raster map. (Source: Alaska Division of Geological & Geophysical Surveys)

    lake
    lake (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    lakelake

    elevation
    point elevations (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1328
    Maximum:6217
    Units:feet

    wells.shp
    Object type is point.Entity value refers to the location of a well. (Source: Alaska Division of Geological & Geophysical Surveys)

    section_grid.shp
    section grid (Source: U.S. Geological Survey)

    township_range.shp
    township and range grid (Source: U.S. Geological Survey)

    hydrology_lines.shp
    hydrology symbolized by lines (Source: U.S. Geological Survey)

    hydrology_polygons.shp
    hydrology symbolized as polygon features (Source: U.S. Geological Survey)


Who produced the data set?

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

  2. Who also contributed to the data set?

    Point elevations digitized from USGS paper quadrangle maps.Hypsography data exported as DEM from All Topo Maps Software from iGage Mapping Corp., Salt Lake City, Utah (version 7.26.28.7370).

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.alaska.gov> for the latest information on available data.Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.


Why was the data set created?

This data set was created and attributed for use as a base map for the Cobblestone Creek-May Creek geologic mapping project. The dataset was created to provide maximum quality resolution for printing and publication purposes.


How was the data set created?

  1. From what previous works were the data drawn?

    Chandler Lake B-1 (source 1 of 2)
    Survey, U.S Geological , 1987, Chandler Lake (B-4), Alaska: 15-minute map series unknown, U.S. Geological Survey, Reston, Virginia, USA.

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 63360
    Source_Contribution: topographic base map

    Chandler Lake C-1 (source 2 of 2)
    Survey, U.S Geological , 1987, Chandler Lake (C-4), Alaska: 15-minute map series unknown, U.S. Geological Survey, Reston, Virginia, USA.

    Other_Citation_Details: 1 sheet
    Type_of_Source_Media: paper map
    Source_Scale_Denominator: 63360
    Source_Contribution: topographic base map

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

    Date: 2006 (process 1 of 1)
    Entities were attributed using ArcGIS 9.0. Point elevations were hand-digitized from the paper USGS quadrangle maps.Hypsography contour lines were created by contouring the 30m DEM grid exported from All Topo Maps.We used Surfer software (Golden Software, Inc., version 8) to contour the grid and export the shapefile.The section, township and range grids used to complete this base map are geospatial data from the Alaska Department of Natural Resources, Land Records Information Section.The hydrography is from USGS DLG data available online.

    Person who carried out this activity:

    State of Alaska, Division of Geological & Geophysical Surveys
    c/o Loveland, A.M.
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907) 451-5010 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm Monday through Friday, except State holidays
    Contact_Instructions:
    Please address all comments or questions to the e-mail address above whenever possible.
    Data sources used in this process:
    • Chandler Lake B-1
    • Chandler Lake C-1

  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?

    Spatial data attributes were attached to data objects using ArcGIS 9. Attributes within the geologically mapped area were verified for consistency and completeness by comparing to the paper USGS quadrangle maps. Entities and attributes that occur or extend beyond the geologic map boundary have not been quality controlled for completeness or accuracy.

  2. How accurate are the geographic locations?

    Hypsography contours are accurate to within the 30m DEM exported from AllTopo.The magnitude of error with respect to ground surface is assumed to be very small or non-existent relative to possible errors in the associated geologic dataset.

  3. How accurate are the heights or depths?

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

    This dataset includes geospatial data that contain information about the topography and hydrology of the Chandler Lake C-1 and B-1 1:63,360 quadrangle maps as illustrated by the U.S. Geological Survey.

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

    Polygon topology is present and clean on the originating geospatial dataset. All polygon features were were topologically validated using the ESRI ArcGIS 9.0 software prior to export to shape file format. The logical consistency of the point and line files has been visually checked but not systematically verified.


How can someone get a copy of the data set?

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

Access_Constraints:
This report, map, and/or data set are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published data sets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these data sets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.

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

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    Natural Resource Technician
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    907-451-5020 (voice)
    907-451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our web site (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    Preliminary Interpretative Report 2009-5

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

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

    It is suggested that MapInfo users import ESRI shape files (if provided) due to the possibility of data loss when importing Arc Export .e00 files. Please check the MapInfo Web site (<http://www.mapinfo.com/>) for the latest documentation on importing Arc Export and/or ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 07-Jul-2008
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5020 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.6 on Mon Jun 15 16:52:10 2009