County, King, 20010501, ImageXXX.tif - Emerge Color Infrared 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 imagery, within the horizontal accuracy and resolution limitations, serves as digital backdrop imagery for GIS, cartographic production and image analysis. 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 data.
The raw images were georectified by the vendor using available 10 m 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 4 m (13.1 feet) 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-thirds area has a error range from under 2 feet up to 7 feet.
The 373 image tiles in the dataset cover the entire area of interest (AOI) as supplied by King County to the Vendor. The portion of Snohomish County that is covered with this dataset is that part of WRIA (Watershed Resource Inventory Area) 8 that extends from King County into Snohomish County. The AOI, however, did not provide for any buffer at the edges of this WRIA nor along any of the other AOI edges, either with adjacent counties or Puget Sound. For this reason the imagery is truncated abruptly along these edges. Also due to this truncation along Puget Sound, there is no or very little extension of the imagery into the near shore zone.
Are there legal restrictions on access or use of the data?
imageXXX.tif where XXX references a tile_id linked to a single polygon in idxpemer.shp index scheme
The King County Department of Information and Administrative Services disclaims any warranty of use of any digital product beyond which it was designed.
|Data format:||TIFF image format with TFW world file and RRD pyramid file|
|Media you can order:||