2010 King County (iTen) Orthoimagery - 6 in Natural Color and Color Infrared imagery for western King County and SW Snohomish County

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Frequently-anticipated questions:

What does this data set describe?

2010 King County (iTen) Orthoimagery - 6 in Natural Color and Color Infrared imagery for western King County and SW Snohomish County
2010 King County Natural Color and Color Infrared orthoimagery acquired by iTen Associates under full leaf-on conditions in February and March. Coverage is western King County and SW Snohomish County at a pixel resolution of 0.5 foot GSD. Lower resolution (12 inch) imagery is being acquired in August for the balance of the County.
The orthoimagery is hosted in the King County Spatial Data Warehouse in the standard township-range tiling scheme and can be viewed with existing GIS and image viewing software.
Township tiles have been compressed at 15X using MrSid compression software. Losslessly-compressed 7500x7500-ft tiles will be available. Full resolution TIF tiles at the 7500-ft level are available only offline.
  1. How should this data set be cited?

    iTen Associates under contract to King County, 201008, 2010 King County (iTen) Orthoimagery - 6 in Natural Color and Color Infrared imagery for western King County and SW Snohomish County: King County, King County; WA.

    Online Links:

    • None

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.44
    East_Bounding_Coordinate: -122.23
    North_Bounding_Coordinate: 47.74
    South_Bounding_Coordinate: 47.49

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/raster/ortho/images/Ortho2010KCExtent.jpg> (JPEG)
    Extent of project area showing separate resolution areas by township
    <http://www5.kingcounty.gov/sdc/raster/ortho/images/Ortho2010KCSample.jpg> (JPEG)
    Example of 0.5 foot imagery

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

    Beginning_Date: 18-Feb-2010
    Ending_Date: 21-Mar-2010
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: Raster image data

  6. How does the data set represent geographic features?

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

      This is a Raster data set. It contains the following raster data types:

      • Dimensions, type Pixel

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

      Grid_Coordinate_System_Name: State Plane Coordinate System
      SPCS_Zone_Identifier: Washington North
      Standard_Parallel: 47.500000
      Standard_Parallel: 48.733333
      Longitude_of_Central_Meridian: -120.833333
      Latitude_of_Projection_Origin: 47.000000
      False_Easting: 1640416.666500
      False_Northing: 0.000000

      Planar coordinates are encoded using Row and column
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      Planar coordinates are specified in Feet

      The horizontal datum used is North American Datum of 1983; 1991 correction.
      The ellipsoid used is GRS 80.
      The semi-major axis of the ellipsoid used is 20925604.4720406.
      The flattening of the ellipsoid used is 1/298.26.

  7. How does the data set describe geographic features?

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?

    iTen Associates

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

    Mike Leathers
    GIS Data Coordinator
    201 S Jackson St
    Seattle, WA 98104

    206-263-4867 (voice)

Why was the data set created?

Natural color orthophoto imagery for King County and portions of adjoining counties. Color infrared imagery can also be used for various vegetative and impervious surface analyses.

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: 03-Aug-2010 (process 1 of 3)
    Data acquired from iTen Associates on a portable HD

    Date: Jul-2008 (process 2 of 3)
    7500x7500 TIF tiles were losslessly compressed to MrSid v3 format. Each tile was briefly inspected for compliance to specifications, including horizontal accuracy (if tile contained control point(s)), and quality of elevated roadway structure rectification.

    Date: Jul-2008 (process 3 of 3)
    MrSid v3 Township tiles were created from the full-resolution 7500-ft TIFs. The compression level was 15x.

  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?

    There are no attributes associated with these raster data formats.

  2. How accurate are the geographic locations?

    One-hundred one (101) ground control points were identified on the imagery. X-Y coordinate points were collected and X and Y offset (Photo - Ground Control) and RMS analysis was performed.
    A spreadsheet of the tabular information can be found at <http://www5.kingcounty.gov/sdc/raster/ortho/photo_control_master_10n050_RMSError.xls>.
    Overall RMS (root-mean square error) is calculated as 1.8 feet (X) and 1.6 (Y), equivalent to a RMS of 0.51m (X) and 0.21m (Y).

  3. How accurate are the heights or depths?

    Not Applicable

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

    Tiles were created for all standard township-range tiles that have at least some data within their extent.
    Data was acquired in three main phases: 1. February 18 through February 21 2. Februrary 22 3. March 19 through March 20.
    The defined lowland (6 inch) acquisition area was not fully completed due to snow and weather conditions in the far eastern part of the acquisition area. This area will be captured during the upland (12 inch) campaign.

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

How can someone get a copy of the data set?

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

Data is licensed by iTen Associates to King County. It is not to be distributed except under one of the following conditions: (a) Cities and other non-state, non-federal, public service entities (fire districts, utility districts, etc.) can become licensed cost-share participants. The receiving agency or city is required to submit, and is bound by, a licensing agreement. Interested parties should contact the GIS Data Coordinator at the KCGIS Center for additional details. (b) Consultants performing a specified Scope of Work (SOW) for a licensed entity, either under a contract or a formal Memorandum of Understanding (MOU), can be provided with a limited amount of data. The data provided cannot exceed the extent or the scope required for the SOW. Data can only be used for the current, defined SOW for which it is provided. The consultant or MOU participant may not redistribute or sell the data in any form. The data must be deleted from the recipients servers or harddrives upon completion of the contract or MOU.
King County digital data may not be reproduced or redistributed in any form or by any means without the express written authorization of the King County Department of Natural Resources and Parks/KCGIS-Center.

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

    Mike Leathers
    KC GIS Center
    GIS Data Coordinator
    201 S Jackson St
    Seattle, WA 98104

    206-263-4867 (voice)

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

    txxryy_10n050.sid for 0.5 foot GSD resolution imagery.

  3. What legal disclaimers am I supposed to read?

    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?

Last modified: 16-Aug-2010
Metadata author:
Mike Leathers
GIS Data Coordinator
201 S Jackson St
Seattle, WA 98104

206-263-4867 (voice)

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

Generated by mp version 2.9.6 on Wed Apr 10 12:32:11 2013