County, King, 2011, 2009 Impervious and Impacted Surface of King County Washington: King County, King County, WA.
- Server=GISPROD; Service=sde:sqlserver:gisprod; Database=raster; User=LANDCOVER; Version=sde.DEFAULT
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 2.000000
Ordinates (y-coordinates) are specified to the nearest 2.000000
Planar coordinates are specified in survey feet
The horizontal datum used is D_North_American_1983_HARN.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Sequential unique whole numbers that are automatically generated.
|1||2000 Ikonos multiband imagery|
|24||TRANS_NETWORK 2011 geometry standardized to 30 feet|
|18||City of Woodinvile 2004 building footprints|
|15||City of Seattle building footprints|
|16||drives, gravel, parking lots, pavement edge, sidewalk, buildings|
|10||driveways, parking, roads, buildings, sidewalk|
|13||paved edge, buildings|
|15||sidewalk, buildings, impervious|
|16||drives, gravel, parking lots, pavement edge, sidwwalk, buildings|
|4||building, streets, sidewalks|
|3||building, streets, sidewalks|
|22||Grid-paint and building outlines interpretation from 2007 Pictometry orthoimagery|
|25||Aerial Express 2009 Near Infrared Orthophotography|
|2||Buildings, Divways, Parking, Pavement, Sidewalk, Streets|
|28||Grid-paint interpretation from 2009 Pictometry|
Provide a project-wide (King County and southwest Snohomish county) generalized interpretation of impervious and impacted surface current to 2009 for those areas completed. By exclusion, null value areas imply vegetated or water. Can to be used, within limitations of accuracy, to determine the distribution of these types of surfaces across the project area and to make first-order areal calculations.
Data sources used in this process:
Data sources used in this process:
200 points were analyzed for accuracy for impervious classification: <http://www5.kingcounty.gov/sdc/raster/landcover/Impervious_point_qc_matrix_2009.htm>
The 2009 update is a complete data update/replacement of the 2000 impervious layer.
Datasets Emerge and DAIS data sources were deleted and replaced with Aerial Express Near Infra Red data and supplemented with external city vector data. King County's T-Net street network was also updated and replaced the 2000 datasets. The Ikons data that covers the east side of King County was retained.
The entire King County area is complete including the "Bright Water" area townships of Snohomish County with some overlap in Pierce County.
The current completed townships include:
t19r06 t19r07 t19r08 t19r09 t19r10 t19r11 t19r12 t20r03 t20r04 t20r05 t20r06 t20r07 t20r08 t20r09 t20r10 t20r11 t20r12 t21r02 t21r03 t21r04 t21r05 t21r06 t21r07 t21r08 t21r09 t21r10 t21r11 t21r12 t22r02 t22r03 t22r04 t22r05 t22r06 t22r07 t22r08 t22r09 t22r10 t22r11 t23r02 t23r03 t23r04 t23r05 t23r06 t23r07 t23r08 t23r09 t23r10 t23r11 t24r03 t24r04 t24r05 t24r06 t24r07 t24r08 t24r09 t24r10 t24r11 t25r03 t25r04 t25r05 t25r06 t25r07 t25r08 t25r09 t25r10 t25r11 t25r12 t25r13 t26r03 t26r04 t26r05 t26r06 t26r07 t26r08 t26r09 t26r10 t26r11 t26r12 t26r13 t27r03 t27r04 t27r05 t27r06 t27r07 t27r08 t27r09 t28r04 t28r05
The original base 2000 impervious surface layer was appended with vector data input for a 2007 update prior to additional interpretive work from 2009 imagery. The 2009 data set replaces the previous 2007 Impervious dataset due to the 2007 dataset's incompleteness. The 2007 update was not completed because of time constraints to manually update the raster dataset and the acquisition of 2009 Aerial Express Near Infra Red data. The order of the addition of the vector layers is significant in those areas where the vector layer information overlapped. The "VALUE" value associated with each vector source indicates the input order and 8bit source code. The Raster Mosaic function works so that the higher (later) appended data supersedes or covers any earlier value/source.
Are there legal restrictions on access or use of the data?
- Online access is restricted to authenticated King County users. Others may obtain the data through KC GIS Center Client Services.
- Use_Constraints: None
Internal King County users can access the data through: Township-Range (idxptrmbr) products: (see "<http://www.kingcounty.gov/operations/GIS/GISData/Metadata/RasterDataConventions.aspx#Tiling>" "<\\gisdw\kclib\plibrary3\idxptrmbr\lndcov_imp_2009\>" as txxryy_imp002 (2-foot grids) Zone-level (idxpzone) mosaics: zxx_imp015, 15-foot grids resampled from 2-foot SDE raster mosaic KeyRegion mosaic "<\\gisdw\kclib\plibrary3\keyregion\landcover\>" contains reg_imp030, a grid resampled from the SDE raster mosaic to 30 foot resolution. This serves only as a general background interpretation for regional analysis and mapping applications.
King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.