USGS High Resolution Orthoimage, Seattle / Tacoma, WA

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: USGS (United States Geological Survey)
Publication_Date: 2003
Title: USGS High Resolution Orthoimage, Seattle / Tacoma, WA
Edition: One
Geospatial_Data_Presentation_Form: Raster Digital Data
Publication_Information:
Publication_Place: King County, WA
Publisher: King County though USGS
Other_Citation_Details:
This data has been provided to King County through the USGS. The data is being made available through the King County GIS Center.
Online_Linkage: None
Description:
Abstract: USGS High Resolution Orthoimage
Purpose: To produce colour orthoimagery of the Seattle/Tacoma Area
Supplemental_Information:
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20020611
Ending_Date: 20020611
Currentness_Reference: Publication date
Status:
Progress:
Maintenance_and_Update_Frequency:
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.05233309
East_Bounding_Coordinate: -122.03790177
North_Bounding_Coordinate: 47.60259646
South_Bounding_Coordinate: 47.58876645
Description_of_Geographic_Extent:
WRIA 8
Keywords:
Theme:
Theme_Keyword_Thesaurus: Not applicable
Theme_Keyword:
Theme_Keyword:
Theme_Keyword:
Theme_Keyword:
Place:
Place_Keyword_Thesaurus: Not applicable
Place_Keyword: WA
Place_Keyword: OR
Place_Keyword: Seattle/Tacoma area
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person:
Contact_Organization: Triathlon
Contact_Position:
Contact_Address:
Address_Type: Mailing and physical address
Address:
City: Seattle
State_or_Province: WA
Postal_Code:
Country: USA
Contact_Voice_Telephone: 604-233-5000
Contact_Facsimile_Telephone: 604-233-5005
Native_Data_Set_Environment:
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
Data_Quality_Information:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The relative accuracy was assembled by comparing adjacent rectified images. The absolute accuracy was assessed by measuring 41 of the ground control points in the rectified image against the actual surveyed co-ordinate position. The testing was for overall accuracy.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 0.40m on 41 points
Horizontal_Positional_Accuracy_Explanation:
After all ground control points within the orthorectified project area were compared against their respective survey values the RMSE was computed at the absolute accuracy value
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Selkirk Remote Sensing
Publication_Date: 2002
Title: USGS High Resolution Orthoimage, Seattle/Tacoma WA
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: USGS
Source_Scale_Denominator: 1:15,000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20020611
Source_Citation_Abbreviation: 1192_6574_089
Source_Contribution: Aerial photography used in orthorectification
Source_Information:
Source_Citation:
Citation_Information:
Originator: Selkirk Remote Sensing
Publication_Date: 2002
Title: USGS High Resolution Orthoimage, Seattle/Tacoma WA
Publication_Information:
Publication_Place: Sioux Falls, SD
Publisher: USGS
Source_Scale_Denominator: 1:15,000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20020611
Source_Citation_Abbreviation: 1193_6574_090
Source_Contribution: Aerial photography used in orthorectification
Source_Information:
Source_Citation:
Citation_Information:
Originator: Triathlon
Publication_Date: 2002
Title: DEM
Publication_Information:
Publication_Place: Richmond, BC
Publisher: Triathlon
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20021116
Ending_Date: 20030118
Source_Contribution: Digital Elevation Model used in the orthorectification process
Source_Information:
Source_Citation:
Citation_Information:
Originator: Triathlon
Publication_Date: 2002
Title: Field control and ABGPS
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20020611
Ending_Date: 20020620
Source_Citation_Abbreviation: Field Control and ABGPS
Source_Contribution:
ABGPS and ground control (i.e., horizontal/vertical, horizontal only and vertical only) were used in creating the project control
Process_Step:
Process_Description:
The horizontal accuracy of the orthorectified imagery is primarily determined by the quality of the Aerial Triangulation solution and the surface model (DEM). The AT process was initiated with the population of the Z/I project files with AGPS, ground survey, and project parameters which are prerequisite to initialization of ISAT. Upon completion of ISAT, a free-net adjustment was run to check for image blunders and poor image ties. Tie points were then corrected/added, ground control was measured, and the adjustment was run with the AGPS and ground control. QC of the adjustment was performed by withholding select ground control points. AT was finalized by densifying the control and performing relative and absolute orientations (RO and AO) for each model. The generation of the surface model was started with an ISAE test run of two models to establish and confirm the parameters for application to the automatic DEM modeling process. For this project, the software was instructed to model flat terrain and perform a high level of data smoothing. This ensured that the majority of the generated points modeled the actual terrain. Each stereo model was then reviewed, DEM points were edited and/or deleted, and breaklines were added, as required, to eliminate smearing and meet orthophoto accuracy standards. Orthorectifications were performed on only the core portion of each image in order to minimize inherent horizontal displacement that occurs radially from the photocenter. All orthophoto tiles were checked visually for relative horizontal accuracy in reference to adjacent tiles. Orthophoto measurements were taken for 41 horizontal ground control points in the project area. An RMSE was calculated for the XY error residuals of the positional differences between the surveyed values and the values measured from the rectified imagery.
Process_Date: 20030214
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Doug Linwood
Contact_Organization_Primary:
Contact_Organization: Triathlon
Contact_Position: Project Manager
Contact_Address:
Address_Type: Mailing and physical address
Address: 13800 Commerce Parkway
City: Richmond
State_or_Province: BC
Postal_Code: V6V 2J3
Country: Canada
Contact_Voice_Telephone: 604-233-5009
Contact_Facsimile_Telephone: 604-233-5005
Contact_Electronic_Mail_Address: dlinwood@triathloninc.com
Hours_of_Service:
Contact_Instructions:
Process_Step:
Process_Description:
King County reprojected the image files to WA State Plane North, NAD83/91 (HPGN) datum. The data was then retiled to the standard King County tiling scheme for raster data. The township-range tiles were compressed into JP2 format.
Process_Date:
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -123.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 0.300000
Ordinate_Resolution: 0.300000
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Distribution_Information:
Distributor:
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
Hours_of_Service: Monday to Friday 9:00AM - 5:00PM
Resource_Description:
tXXryy_02n098.jp2, 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 photography, with '098' representing 98/100ths foot (approximatly 1 ft) ground sample distance resolution (gsd).
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: 092003
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@metrokc.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.7.17 on Wed May 28 15:27:17 2008