County, King, 20010511, ImageXX.tif - DAIS Color Infrared 8-bit Aerial Photography: King County, King County, WA.Online Links:
County, King, 2000, ESA/SAO Multispectral Image Acquisition: King County, King County, WA.Online Links:
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.
206-296-3775 (voice)
206-296-3749 (FAX)
mike.leathers@kingcounty.gov
The image dataset comprises 25 individual image tiles stored in TIFF format that can be displayed as a single seamless mosaic. The original imagery was 12-bit, 4-band multispectral data. This dataset is a conversion of the original to 8-bit, 3-band data (red band omitted) that is more easily viewed with common software than the original multispectral data. The imagery, within the horizontal accuracy and resolution limitations, serves as digital backdrop imagery for GIS analysis and cartographic display. This 'false color' format displays the infrared band by default making it useful for visual analysis of vegetative vs non-vegetative characteristics. However the data is not intended to be used for true multispectral analysis as it is missing the one band and is of lower dynamic range than the original data. Absolute and relative horizontal accuracy of the data should be carefully considered when either determining coordinate positions or when applying the data relative to other spatial datatsets.
.Online Links:
.Online Links:
Person who carried out this activity:
206-296-3775 (voice)
206-296-3749 (FAX)
mike.leathers@kingcounty.gov
Data sources produced in this process:
Person who carried out this activity:
206-296-3775 (voice)
206-296-3749 (FAX)
mike.leathers@kingcounty.gov
Data sources produced in this process:
The raw images were geogrectified 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 or exceeded the contract specification for NMAS 1:10000 (CE90 of 4m (13.1ft)). The number of known ground control locations for confirmation was very small (9) and three of the locations were not discernable on the imagery. For the remaining six discernable points the horizontal offset between the imagery and the known control points ranges from 1 to 2 meters. Initial review indicates that the data exhibits this level of accuracy relatively evenly over the area of interest without significant skewing.
The imagery covers the full extent of Vashon and Maury Islands. There are no breaks in the tiling scheme or the imagery. The littoral zone is captured around the entire land mass. The amount water buffer captured varies from a minimum of approximately 0.1 mile to about 0.6 miles. This generally provides adequate coverage of the land/water transition zone for display and analyses requirements.
Are there legal restrictions on access or use of the data?
- Access_Constraints: Online access is restricted to King County GIS users
- Use_Constraints:
- King County digital data may not be reproduced or redistributed without the express written authorization of the King County Department of Information and Administrative Services. Specfic constraints apply per the licensing agreement with Space Imaging.
206-263-5220 (voice)
cheryl.wilder@kingcounty.gov
imageXX.tif where XX references a tile-id linked to a single polygon location in idxpdais.shp index scheme. The domain of the the tile_id is 1 through 25.
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 |
|---|---|
| Media you can order: |
CD-ROM
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206-296-3775 (voice)
206-296-3749 (FAX)
mike.leathers@kingcounty.gov