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.
This is a Raster data set. It contains the following raster data types:
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.
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.
There are no attributes associated with these raster data formats.
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).
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.
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.
txxryy_10n050.sid for 0.5 foot GSD resolution imagery.
King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.