Rivers, 1 to 1,000,000

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Frequently-anticipated questions:

What does this data set describe?

Title: Rivers, 1 to 1,000,000
Abstract:
The Alaska Department of Natural Resources (ADNR) has combined rivers for several Digital Chart of the World (DCW) tiles into one coverage. Some edits were made where arcs were missing (Taku River, near Juneau). The coverage was clipped to the State of Alaska boundary. The islands and river polygons were reselected out of the coverage for simplification.

The river data were combined from the DNNET coverages comprising the following 5 degree by 5 degree tiles for Alaska:

AK 12,22,23,32,33 AL 21,31,32 BK 12,13,22,23,33 BL 11,12,13,21,22,23,31,32,33 CK 12,23,33 CL 11,12,13,21,22,23,31 DK 12,13,22,23 ZK 22,32

Please note: Portions of this product include intellectual property of ESRI and are used herin with permission. Copyright (c) 1992 Environmental Systems Research Institute, Inc. All rights reserved.

License Agreement: <http://www.asgdc.state.ak.us/homehtml/esri.htm>

Supplemental_Information:
Procedures_Used: This coverage was taken from ESRI's Digital Chart of the World. It is clipped to the State of Alaska. This data was extracted from the DNNET coverage for each tile that covers Alaska. For more info see - DCW Data Dictionary

Revisions: 02/25/98 - D. Mortenson Renamed from dcw_rivers or $DCW_RIVERS to rvr1mil.

01/10/97 - M. Gorham Performed a clean on cover.

12/18/96 - D. Mortenson Taku River (near Juneau) was missing some of its arcs. Added some arcs to fill in where it should be.

Notes: Date Received: 8/93 Verified: E. Kenning Documented by: E. Kenning 6/94 To use the ARCs for this coverage: ---------------------------------- UNSEL $DCW_RIVERS line dnlntype = 99 (this will remove all connectors between rivers-lakes and oceans)

To use the POLYs for this coverage: ----------------------------------- RESEL $DCW_RIVERS poly type = R (this will select all the RIVER polys)

UNSEL $DCW_RIVERS poly type = I (this will unselect all the ISLAND polys)

  1. How should this data set be cited?

    AK Department of Natural Resour, Land Records Information Section, 1998, Rivers, 1 to 1,000,000: physical_feature river_1mil_py, ADNR, LRIS, Anchorage, AK.

    Online Links:

    • Server=rex.dnr.state.ak.us; Service=5152; User=gis_base; Version=SDE.DEFAULT

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -179.914419
    East_Bounding_Coordinate: 179.937949
    North_Bounding_Coordinate: 72.030119
    South_Bounding_Coordinate: 48.159364

  3. What does it look like?

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

    Calendar_Date: 1991
    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?

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

      • G-polygon (1142)

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

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 55.000000
      Standard_Parallel: 65.000000
      Longitude_of_Central_Meridian: -154.000000
      Latitude_of_Projection_Origin: 50.000000
      False_Easting: 0.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.010000
      Ordinates (y-coordinates) are specified to the nearest 0.010000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      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.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    GIS_BASE.river_1mil_py

    SHAPE_Leng

    SHAPE_Area
    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Entity_and_Attribute_Overview:
    CODE DESCRIPTION -------- ----------- I Islands R Rivers
    Entity_and_Attribute_Detail_Citation:
    The Digital Chart of the World for use with Arc/Info, Environmental Systems Research Institute, Inc. 1991

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?

    Environmental Systems Research Institute

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

    GIS Public Access Coordinator
    AK Department of Natural Resources - Land Records Information Section
    GIS Public Access Coordinator
    550 W. 7th Suite 706
    Anchorage, AK 99501
    USA

    907 269 8833 (voice)
    907 269 8920 (FAX)
    gis_public_access@dnr.state.ak.us

    Hours_of_Service: 800-1600 AST
    Contact_Instructions: See Distribution_Information

Why was the data set created?

ANDR's prupose for modifying this information was for mapping a physical base at 1:1,000,000.

How was the data set created?

  1. From what previous works were the data drawn?

    ESRI DCW - DNNET (source 1 of 1)
    Environmental Systems Research , Inc, 1991, Digital Chart of the World, Drainage: ESRI, Redlands, CA.

    Type_of_Source_Media: unknown
    Source_Scale_Denominator: 1000000
    Source_Contribution:
    The DCW DNNET data was the starting base for the statewide rivers coverage. The primary source of the DCW is the US Defense Mapping Agency (DMA) Operational Navigation Chart (ONC) series.

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

    Date: 1994 (process 1 of 7)
    See Abstract and Supplimental_Information.

    Date: unknown (process 2 of 7)
    Coverage rvr1mil imported into geodatabase.

    Person who carried out this activity:

    Marty Martin
    ADNR
    GIS Data Administrator
    550 W. 7th Suite 706
    Anchorage, AK 99501
    USA

    907 269 8837 (voice)
    907 269 8920 (FAX)
    marty_martin@dnr.state.ak.us

    Hours_of_Service: 0800-1600
    (process 3 of 7)
    Dataset copied.

    Data sources used in this process:

    • Server=rex.dnr.state.ak.us; Service=5152; User=gis_base; Version=SDE.DEFAULT

    (process 4 of 7)
    Dataset copied.

    Data sources used in this process:

    • \\kodiak\gis\projects\gis_base\prod9i\backup\20061214.mdb

    (process 5 of 7)
    Dataset copied.

    Data sources used in this process:

    • \\kodiak\gis\projects\gis_base\common\feature_datasets\albers_nad27.mdb

    (process 6 of 7)
    Dataset copied.

    Data sources used in this process:

    • Server=tee.dnr.state.ak.us; Service=5155; User=gis_base; Version=SDE.DEFAULT

    (process 7 of 7)
    Dataset moved.

    Data sources used in this process:

    • Y:\nssi\nssi_shapefiles\river_1mil_py

  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?

    Unknown

  2. How accurate are the geographic locations?

    Unknown

  3. How accurate are the heights or depths?

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

    Unknown

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

    Polygon and chain-node topology present.

How can someone get a copy of the data set?

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

Access_Constraints:
To ensure distribution of the most current public information, please refer requests for data or products to the Alaska Department of Natural Resources, Land Records Information Section.
Use_Constraints:
It is not recommended the data be used at a scale larger than 1:1,000,000.

Any hardcopies utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by Alaska Department of Natural Resources.

ESRI License Agreement: <http://www.asgdc.state.ak.us/homehtml/esri.htm>

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

    Alaska Department of Natural Resources - Land Records Information Section
    GIS Public Access Coordinator
    550 W. 7th Suite 706
    Anchorage, AK 99501
    USA

    907 269 8833 (voice)
    907 269 8920 (FAX)

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

    Downloadable Data

  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 users 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 requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 22-Apr-2004
Metadata author:
Alaska Department of Natural Resources - Land Records Information Section
c/o Marty Martin
GIS Data Administrator
550 W 7th Ave., Suite 706
Anchorage, AK 99501

907 269 8837 (voice)
marty_martin@dnr.state.ak.us

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.6 on Thu May 8 10:19:13 2008