County, King, 20010126, NatcolorXXX.tif-Emerge Natural Color Derivative Aerial Photography: King County, King County, WA.
County, King, 2000, ESA/SAO Multispectral Image Acquisition: 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
Planar coordinates are specified in Feet
The horizontal datum used is North American Datum of 1983.
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.
This image dataset comprises 373 individual image tiles stored in TIFF format that can be displayed as a single seamless mosaic. The images were converted from original 'False Color" near-infrared format to a natural color derivative. The imagery, within the horizontal accuracy and resolution limitations, serves as digital backdrop imagery for GIS and cartographic display. In particular, the absolute and relative horizontal accuracy should be carefully considered when either determining coordinate positions or when applying the data relative to other spatial datasets.
The raw images were georectified by the vendor using available 10m DEM supplemented by limited GPS ground control. After delivery of the tiled images, in-house horizontal accuracy analysis indicated that the data met the contract specification for 1:10000 NMAS with a CE90 of 4m (13.1 foot accuracy). However the absolute accuracy varies significantly across the project area. In general, areas in the northern one-third of the project area exhibit greater variance from known ground control than in the balance of the project area. The error allowance in the northern one-third area approaches the CE90 limit, while the southern two-third area has an error range from under 2 feet to 7 feet. See <http://www5.kingcounty.gov/sdc/horiz_accuracy.htm>
Are there legal restrictions on access or use of the data?
- Access_Constraints: Online access is restricted to King County GIS users.
- 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 Dept. of Information and Administrative Services. Specific constraints apply per the licensing agreement with Space Imaging.
natcolorXXX.tif where XXX references a tile_id linked to a single polygon location in idxpemer.shp index scheme
The King County Department of Information and Administrative Services disclaims any warranty of use of any digital product beyond that which it was designed.
|Data format:||TIFF image format|
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