Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska

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Frequently-anticipated questions:


What does this data set describe?

Title:
Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska
Abstract:
This dataset is comprised of a vector topographic base map illustrating the Chandler Lake B-4 and C-4 1:63,360 quadrangles.
Supplemental_Information:
The geospatial data in this dataset were vectorized from scanned raster topographic maps published by the U.S. Geological Survey. The metadata for the vector topographic base maps (the Chandler Lake B-4 and C-4) are addressed separately. 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:
b4_hydroline     rivers and streams represented as lines (B-4 Chandler Lake Quadrangle)
b4_hydropoly     rivers, streams, lakes, and swamps represented as polygons (B-4 Chandler Lake Quadrangle)
b4_ptelev     point elevations (B-4 Chandler Lake Quadrangle)
b4_topoline     contour lines (B-4 Chandler Lake Quadrangle)
c4_hydroline     rivers and streams represented as lines  (C-4 Chandler Lake Quadrangle)
c4_hydropoly     rivers, streams, lakes, and swamps represented as polygons  (C-4 Chandler Lake Quadrangle)
c4_ptelev     point elevations (C-4 Chandler Lake Quadrangle)
c4_topoline     contour lines (C-4 Chandler Lake Quadrangle)
secgridz5     section grid
townrangez5     township and range grid
  1. How should this data set be cited?

    Loveland, A.M., 2007, Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska: Preliminary Interpretive Report PIR 2007-1, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, Alaska - USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -152.4000
    East_Bounding_Coordinate: -151.8000
    North_Bounding_Coordinate: 68.7500
    South_Bounding_Coordinate: 68.5000

  3. What does it look like?

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

    Calendar_Date: 2006
    Currentness_Reference: ground condition

  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: 0.9996
      Longitude_of_Central_Meridian: -147.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      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 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    b4_topoline.shp
    Object type is vector lines and there are 718 rows associated with this entity. The entity values refer to lines connecting points of equal elevation (contour lines) (Source: Alaska Division of Geological & Geophysical Surveys)

    Elevation
    Elevation of contour lines as displayed on the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map. (Source: Attribute values were assigned by the Alaska Division of Geological & Geophysical Surveys based on contour interval labels displayed on the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map.)

    ValueDefinition
    nullNull refers to elevations that were not attributed. Only the bold weight, elevation-labeled contours from the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map were attributed.

    Range of values
    Minimum:2000
    Maximum:5000
    Units:feet

    LineWeight
    Line weight refers to the thickness of a contour line depending on whether it is an intermediate contour(null) or an index contour (bold). (Source: Attribute values were assigned by the Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    nullcorresponds to unlabeled, intermediate contour lines
    Boldcorresponds to index contour lines with elevation values

    b4_ptelev.shp
    Object type is point and there are 82 rows associated with this entity. The entity values correspond to locations of benchmark, spot, or lake elevation values. (Source: Alaska Division of Geological & Geophysical Surveys)

    PtElevatio
    elevation of locations of benchmark, spot, and/or lake elevation values as displayed on the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1745
    Maximum:6156
    Units:feet

    b4_hydroline.shp
    Object type is vector lines and there are 484 rows associated with this entity. The entity corresponds to rivers or streams that are represented as lines on the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map. No user-defined attributes have been assigned to this entity. (Source: Alaska Division of Geological & Geophysical Surveys)

    b4_hydropoly.shp
    Object type is polygons and there are 162 rows associated with this entity. The entity corresponds to rivers or streams that are represented as polygons on the U.S. Geological Survey Chandler Lake B-4 1:63,360 quadrangle map. No user-defined attributes have been assigned to this entity. (Source: Alaska Division of Geological & Geophysical Surveys)

    c4_topoline.shp
    Object type is vector lines and there are 597 rows associated with this entity. The entity values refer to lines connecting points of equal elevation (contour lines) (Source: Alaska Division of Geological & Geophysical Surveys)

    Elevation
    Elevation of contour lines as displayed on the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map. (Source: Attribute values were assigned by the Alaska Division of Geological & Geophysical Surveys based on contour interval labels displayed on the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map.)

    ValueDefinition
    nullNull refers to elevations that were not attributed. Only the bold weight, elevation-labeled contours from the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map were attributed.

    Range of values
    Minimum:2000
    Maximum:5000
    Units:feet

    LineWeight
    Line weight refers to the thickness of a contour line depending on whether it is an intermediate contour(null) or an index contour (bold). (Source: Attribute values were assigned by the Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    nullcorresponds to unlabeled, intermediate contour lines
    Boldcorresponds to index contour lines with elevation values

    c4_ptelev.shp
    Object type is point and there are 43 rows associated with this entity. The entity values correspond to locations of benchmark, spot, or lake elevation values. (Source: Alaska Division of Geological & Geophysical Surveys)

    PtElevatio
    elevation of locations of benchmark, spot, and/or lake elevation values as displayed on the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1745
    Maximum:6156
    Units:feet

    c4_hydroline.shp
    Object type is vector lines and there are 725 rows associated with this entity. The entity corresponds to rivers or streams that are represented as lines on the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map. No user-defined attributes have been assigned to this entity. (Source: Alaska Division of Geological & Geophysical Surveys)

    c4_hydropoly.shp
    Object type is polygons and there are 240 rows associated with this entity. The entity corresponds to rivers or streams that are represented as polygons on the U.S. Geological Survey Chandler Lake C-4 1:63,360 quadrangle map. No user-defined attributes have been assigned to this entity. (Source: Alaska Division of Geological & Geophysical Surveys)

    townrangez5.shp
    Object type is polygons and there are 21 rows associated with this entity. The entity corresponds to the township and range grid. (Source: Alaska Division of Geological & Geophysical Surveys)

    rng_name
    Refers to the range number and directionality and appears in the following format: R1W, where R means "range", the number is the range identifier, and W is the directionality (Range 1 West in this example). (Source: Alaska Division of Geological & Geophysical Surveys)

    Refers to the name of a range on the township and range grid and is formatted as stated in the "attribute definition" field above.

    twp_name
    Refers to the township number and directionality and appears in the following format: T12N, where T means "township", the number is the township identifier, and N is the directionality (Township 12 North in this example). (Source: Alaska Division of Geological & Geophysical Surveys)

    Refers to the name of a township on the township and range grid and is formatted as stated in the "attribute definition" field above.

    secgridz5.shp
    Object type is polygons and there are 846 rows associated with this entity. The entity corresponds to the section grid. (Source: Alaska Division of Geological & Geophysical Surveys)

    twp
    Refers to the township number (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7
    Maximum:15
    Units:township

    twp_dir
    Refers to the township direction (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    SRefers to South

    rng
    Refers to the range number (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:2
    Units:range

    rng_dir
    Refers to the range direction (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    ECorresponds with East
    WCorresponds with West

    sec_no
    Refers to the section number (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1
    Maximum:36
    Units:section


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?

    Funding for the geologic mapping performed for this project was provided by the U.S. Geological Survey STATEMAP Program under award number 05HQAG0025 with additional funding from the National Petroleum Refuge-Alaska Project (NPRA). Project management by Paige R. Peapples. Digital vectorization, attributing, and metadata by Andrea Loveland.

  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.dnr.state.ak.us> 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 Siksikpuk STATEMAP geologic mapping project that took place during the 2004-2005 field season. 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-4 (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-4 (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)
    Individual map separates were obtained from the U.S. Geological Survey Earth Science Information Center in Denver, Colorado. Two map separates were used, including: 1) contour lines and peak elevations, and 2) hydrology. Each of these black and white separates were scanned. The resulting TIFF images were then georeferenced and vectorized in a program designed by Able Software called Raster to Vector Map Conversion (R2V). A geodatabase for both the Chandler Lake B-4/C-4 topography and hydrology were created and entities were attributed using ArcGIS 9.0. The section, township and range grids used to complete this base map are geospatial data from the Department of Natural Resources internal dataset.

    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-4
    • Chandler Lake C-4

  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?

    Individual map separates were scanned and vectorized to Alaska Division of Geological & Geophysical Surveys (DGGS) specifications in a program called Raster to Vector Map Conversion (R2V) by Able Software. The magnitude of error associated with vectorization of the raster images is very small or non-existent. Essentially, during auto-vectorization, lines on the scanned image are traced by the program, producing vector lines. Able Software reports that no spatial error occurs during automated vectorization.

  2. How accurate are the geographic locations?

    Individual map separates were scanned and vectorized to Alaska Division of Geological & Geophysical Surveys (DGGS) specifications. The magnitude of error associated with the step is unknown but it 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?

    Individual map separates were scanned and vectorized to Alaska Division of Geological & Geophysical Surveys (DGGS) specifications. The magnitude of error associated with the step is unknown but it assumed to be very small or non-existent relative to possible errors in the associated geologic dataset.

  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-4 and B-4 1:63,360 quadrangle maps as illustrated by the U.S. Geological Survey.

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

    Topology is present on appropriate line and polygon datasets.


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.dnr.state.ak.us>) 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 2007-1

  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?

    Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.


Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 04-Apr-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5039 (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 Tue May 06 14:29:36 2008