King County 2002 Color Aerial Photography

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: King County
Publication_Date: 200411
Title: King County 2002 Color Aerial Photography
Edition: Two
Geospatial_Data_Presentation_Form: Raster image
Publication_Information:
Publication_Place: King County, WA
Publisher: King County
Other_Citation_Details:
This imagery has been acquired as part of the ESA/SAO data acquisition project. The ESA/SAO project is a multi-department, multi-phase effort to update critical base resource and environmental data in GIS-compatible format. These related projects are operating under the umbrella of the Endangered Species Act/Sensitive Areas Ordinance (ESA/SAO) initiative.
Online_Linkage: None
Description:
Abstract:
Natural color orthophotography acquired in July 2002 covering approximately 2300 square miles of King County (including Vashon Island) and southwestern Snohomish County. Data was orthorectified using Lidar Digital Ground Model terrain information and tiled in a seamless mosaic. Default seamline matching was used. Original diapositive images were scanned at 11.5 microns yielding pre-orthophoto rectification raw pixal sizes of 0.77 feet for the 1"=1700' and 1.13 feet for the 1"=2500' data sets. Final output ground sample distance (gsd) is 1 feet for entire mosaic. Data is provided in MrSid compressed format at a 1:7 ratio. This lossy compression results in variable data quality and clarity. Orthorectified tiff files are available for this dataset. Larger zone and keyregion mosaics are also available, but at a higher compression, thus lower-resolution format.
Purpose:
The 2002 King County orthorectified color imagery updates the King County Spatial Data Warehouse. Data is available for a range of internal and external GIS, engineering and other mapping applications. This data replaces Version 1 of the 2002 King County data which was stored in a lower-resolution format. The King County data provides full-county coverage.
Supplemental_Information:
The primary access to this data will be in a compressed MrSid format. Images are tiled to the King County idxptrmbr tile scheme - a tile scheme based on the PLSS township-range organization. See the KCGIS Spatial Data Catalog <http://www5.kingcounty.gov/sdc/index.htm> for more information on how King County imagery and other raster data is organized.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 200207
Ending_Date: 200207
Currentness_Reference: Acquisition date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.5470
East_Bounding_Coordinate: -121.5785
North_Bounding_Coordinate: 47.9279
South_Bounding_Coordinate: 47.1305
Description_of_Geographic_Extent:
WRIA 8
Keywords:
Theme:
Theme_Keyword_Thesaurus: Not applicable
Theme_Keyword: Digital color aerial photography
Theme_Keyword: Orthorectified photography
Theme_Keyword: Natural color photography
Theme_Keyword: Orthophotography
Place:
Place_Keyword_Thesaurus: Not applicable
Place_Keyword: King County, WA
Place_Keyword: Pacific NW
Place_Keyword: Washington state
Place_Keyword: Vashon Island, WA
Place_Keyword: Southwestern Snohomish County
Access_Constraints: None
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Michael Leathers
Contact_Organization: King County GIS Center
Contact_Position: GIS Data Coordinator
Contact_Address:
Address_Type: Mailing and physical address
Address: 201 S Jackson St
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-263-4867
Native_Data_Set_Environment:
Windows Operating System, MrSid format is supported by multiple viewing and GIS software.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Not applicable
Logical_Consistency_Report:
Variation in acquisition parameters, protracted acquisition schedule and water features result in less than optimal tonal balancing and overall color consistency. Adjustments to display characteristics in viewing software can enhance display quality.
Completeness_Report:
The dataset includes all images captured as part of the overflight. There were 793 photos collected for the 'western' (lowland) portion of the project area at a photo scale of 1" = 1700', covering an area of approximately 1500 sq. miles.
For the 'eastern' (upland) portion of the project area 306 photos where taken at a photo scale of 1" = 2500', covering an area of approximately 825 sq. miles.
Township tiles created from the 1" = 2500 foot photography are:
Townships 19 Ranges 09-12, Townships 20 Ranges 09-12, Townships 21 Ranges 09-12 Townships 22 Ranges 10-11, Townships 23 Ranges 10-12, Townships 24 Ranges 10-14 Townships 25 Ranges 10-13, Townships 26 Ranges 10-13
All other township tiles were created from the 1" = 1700' photography.
The three half-townships in eastern King County are incorporated into their adjacent full townships, T24R11, T24R12, T24R13, per the tiling scheme.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
A thorough horizontal accuracy check has not been performed on the dataset.
For the 1" = 1700' source photos: Maximum error, in areas of strong relief or over elevated features (i.e, overpasses), may be as great as 15 feet. Generally, error is expected to be less than this, in the range of 6-10 feet.
For the 1" = 2500" source photos: Maximum error, in areas of strong relief or over elevated features (i.e, overpasses), may be as great as 20 feet. Generally, error is expected to be less than this, in the range of 10-15 feet.
Lineage:
Process_Step:
Process_Description:
Photos were acquired using standard film-based technology by Bergman and Associates under subcontract to 3di West. Photos were captured in stereo configuration. Aerial Triangulationwas performed utilizing airborne GPS and ground control to orient the photos to the Washington State Plane (North Zone) coordinate system.These low-level photos were collected at a photo scale of 1"=1700', and the high-level photos at 1" = 2500', with a 6" camera focal length.
The film negatives were scanned at 11.5 microns by 3di, Easton, MD resulting in a pre-orthophoto rectified nominal pixel size of 0.77 feet for the low-level and 1.13 feet for the high-level. The digital images were output in Tiff-tiled format with separate planar configuration, with pyramid layers. The scanned images were delivered to King County for quality assessment on portable harddrives.
Process_Date: 200211
Process_Step:
Process_Description:
Digital terrain information was extracted from LiDAR rasters in ArcInfo Grid format captured in 2002. A composite grid based on 100 foot buffered idxp7500 index tiles that are resampled to 12 feet and converted to a point coverage using the GRIDPOINT command. ADDXY command was used to append coordinates to the attribute table. The PAT attribute table was unloaded to an ASCII file.
The terrain information was not edited.
Process_Date: 200212
Process_Step:
Process_Description:
Images and terrain information were input into the Ortho/Mosaic module in SOCET SET from Leica Geosystems and BAE. A list of all images required for the project area, as well as the name of the digital terrain file were provided to the software. The lower-left and upper-right coordinates of each idxp7500 Bounding Rectangle tile was provided and the program was executed.
The ortho/mosaic seamline autogenerated by the software were not reviewed or edited. Bridges and overpasses/interchanges were not modeled during the orthorectification process. They are rectified to the ground per the LiDAR terrain model, as are all elevated/non-ground features.
The orthophotos were not given a comprehensive quality evaluation.
Process_Date: 2003
Process_Step:
Process_Description:
Output orthorectified idxp7500 tiles in TIFF format are clipped to the idxptrmbr boundary and compressed using MrSid format compression. The compression ratio is 1:7.
Process_Date: 2004
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 4400
Column_Count: 7400
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: Washington, North
Lambert_Conformal_Conic:
Standard_Parallel: 47.500000
Standard_Parallel: 48.733333
Longitude_of_Central_Meridian: -120.833333
Latitude_of_Projection_Origin: 47.000000
False_Easting: 1640416.666500
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Row and column
Planar_Distance_Units: Feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983, 1991 correction
Ellipsoid_Name: GRS 80
Semi-major_Axis: 20925604.4720406
Denominator_of_Flattening_Ratio: 298.26
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The images are stored in raster format. They have no attribute table.
Entity_and_Attribute_Detail_Citation: Not applicable
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Dennis Higgins
Contact_Organization:
King County GIS Center, Client Services, Department of Natural Resources and Parks
Contact_Position: Manager, Client Services
Contact_Address:
Address_Type: Mailing and physical address
Address: 201 S Jasckson St, Suite 706
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-263-4523
Resource_Description:
tXXrYY_02n100.sid, where tXX refers to the PLSS township on which the tile scheme is based and rYY indicates the range. _02 indicates the acquisition year is 2002, 'n' indicates natural color orthophotography, with '100' representing 100/100ths foot (= 1 ft) ground sample distance resolutions (gsd). Tiling levels at 7500, township-range and zone are all stored at 1 foot pixel resolution (with required compression). The KeyRegion full-county mosaic is provided as resampled 1.5 foot pixels. This resampling was required to accomodate maximum compression limits.
Distribution_Liability:
King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.
Metadata_Reference_Information:
Metadata_Date: 200411
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Michael Leathers
Contact_Organization: King County GIS Center
Contact_Position: GIS Data Coordinator
Contact_Address:
Address_Type: Mailing and physical address
Address: 201 S Jackson St
City: Seattle
State_or_Province: WA
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-263-4867
Contact_Electronic_Mail_Address: mike.leathers@kingcounty.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
City: Seattle
Country: US
City: Seattle
Country: US
City: Seattle
Country: US
Generated by mp version 2.9.6 on Wed Apr 10 12:31:55 2013