IDXP7500_EXT - 7500-ft Tiling Index for Multi-County Area

Metadata also available as - [Outline]

Frequently anticipated questions:


What does this data set describe?

Title: IDXP7500_EXT - 7500-ft Tiling Index for Multi-County Area
Abstract:
A spatial tiling index designed for storage of file-based image and other raster (i.e., LiDAR elevation, landcover) data sets.
  1. How should this data set be cited?

    County, King, 20161115, IDXP7500_EXT - 7500-ft Tiling Index for Multi-County Area: King County, King County, WA.

    Online Links:

    • None

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -123.324581
    East_Bounding_Coordinate: -120.763012
    North_Bounding_Coordinate: 48.398121
    South_Bounding_Coordinate: 46.686155

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/idxp7500_ext.jpg> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

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

    Calendar_Date: 22-Nov-2016
    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):

      • GT-polygon composed of chains (6806)

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

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00025
      Ordinates (y-coordinates) are specified to the nearest 0.00025
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    maint.GISC.idxp7500_ext_area
    area data table (Source: King County)

    OBJECTID
    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    TILE_ABBLC
    Unique identifier, in lower case, for each cell (Source: King County)

    Four-character identifier, comprised of 2 alpha characters for column and 2 integer values for row, i.e., au32

    ROW_ID
    The numeric row identifer portion of cell (Source: King County)

    Range of values
    Minimum:1.0
    Maximum:99.0

    TILE_ABB
    Unique identifier, in upper case, for each cell (Source: King County)

    Four-character identifier, comprised of 2 alpha characters for column and 2 integer values for row, i.e., AU32

    COL_ABB
    The 2-alpha character identifier, in upper case, for each column (Source: King County)

    Two alpha characters such as AU

    COL_ABBLC
    The 2-alpha character identifier, in lower case, for each column (Source: King County)

    Two alpha characters such as au

    Shape
    Feature geometry. (Source: Esri)

    Coordinates defining the features.

    Shape.area
    Area of polygon in square feet (Source: Esri)

    Integer value

    Shape.len
    Length of polygon perimeter in feet (Source: Esri)

    Integer value

    Entity_and_Attribute_Overview:
    The data table contains the required column, row and cell identifiers.
    Entity_and_Attribute_Detail_Citation: King County


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?

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

    King County GIS Center
    Attn: Mike Leathers
    GIS Data Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104
    US

    206-477-4403 (voice)


Why was the data set created?

This index is primarily a data processing, data storage level index which allows all raster and image data stored at this level to be maintained in a common, consistent tile and naming scheme. It is based on the original IDXP7500 layer, but has been extended to cover a signficantly larger area than just King County. Where it overlaps the original IDXP7500 grid, the two grids are identical.


How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 29-Nov-2016 (process 1 of 1)
    The fishnet tool was used to create the grid so that it aligned with the original IDXP7500 grid. Where coincident the attributes were populated with a spatial join. New attributes were added for those cells outside of the original grid. Due to the naming convention, the extension to the west generated two columns that were duplicative of existing columns to the east of the original origin. These two western-most columns were delete to ensure uniqueness. This did not significantly affect the useable extent of the grid.

  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 attributes from the original IDXP7500 were conflated to the new grid. Where new attributes were required, they were calculated in. All attributes were evaluated to ensure sequentiality and uniqueness.

  2. How accurate are the geographic locations?

    The vertices of each cell corner are accurate to 1 foot.

  3. How accurate are the heights or depths?

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

    The grid is complete for the extent of its bounds. No areas are omitted.

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

    The grid defines cells with an alpha column identifier cocantenated with an integer row identifier. Because the grid was extended south and west of the original origin (AA01), a reverse progression of the column identifer was applied going west. Going south of the original origin, a decreasing integer sequence is applied. So although from the new origin, the progression of column and row identifiers is not linearly continuous, each cell is uniquely identified and there are no duplicates.


How can someone get a copy of the data set?

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

Access_Constraints:
Access Constraint: Data is not available on GIS Data Portal, it may be available via a custom data request
Use_Constraints:
Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

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

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 706
    Seattle, WA 98104
    US

    206-477-4421 (voice)

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

    /plibrary2/survey/shapes/polygon/idxp7500_ext.shp

  3. What legal disclaimers am I supposed to read?

    Distribution Liability: King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 22-Nov-2016
Metadata author:
King County GIS Center
Attn: Mike Leathers
GIS Data Coordinator
201 S Jackson St, Suite 706
Seattle, WA 98104
US

206-477-4403 (voice)
firstname.lastname@kingcounty.gov

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.12 on Sat Apr 06 04:10:15 2019