2007 King County (Pictometry) Orthoimagery - 6 in (west) and 1 ft (east)

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Pictometry (under contract with King County)

Publication_Date: 200802

Title:

2007 King County (Pictometry) Orthoimagery - 6 in (west) and 1 ft (east)

Edition: One

Geospatial_Data_Presentation_Form: Raster image data

Publication_Information:

Publication_Place: King County; WA

Publisher: King County

Other_Citation_Details: None

Online_Linkage: None

Description:

Abstract:

Draft 1 version 2007 (July) King County Natural Color orthoimagery acquired by Pictometry for internal business and agency use only. Pixel resolution is 1.0 foot GSD in rural (east) King County and 0.5 foot GSD in urbanized (west) King County. Higher resolution data includes portion of southwestern Snohomish County, and for the Highway 2 corridor in northeast King County and for the Apenal area near Snoqualmie Pass. The 1.0 foot data is also known as Neighborhood-level imagery whereas the 0.5 foot data is known as Community-level imagery.

Purpose:

Color orthophoto imagery for King County and portions of adjoining counties. Portion of larger Pictometry package that contains their proprietary oblique and orthogonal view imagery for same project area.

Supplemental_Information:

The orthoimagery described in this metadata will be delivered in King Countys standard tiling scheme and can be viewed with existing GIS and image viewing software. The proprietary package of oblique/orthogonal imagery from Pictometry is viewable only through their ArcGIS 9.x extension and their stand-alone EFS software. Though the imagery is stored in native resolution (both 0.5 foot and 1.0 foot) in Plibrary3, ArcGIS LYR files are standardized to a naming convention of txxryy_07n050.lyr, even for areas where the GSD of the native imagery is 1 foot. ArcGIS users are encouraged to use the the Plibrary LYR files as they have been symbolized to minimize the effect of the black (0,0,0) mask along the edges of all tiles. ArcView 3.x users cannot use LYR files and must access the Plibrary3 township tiles directly. These tiles will show the black mask which will overlay valid data in adjacent tiles depending on the drawing order. Final version of this data will not have this affect.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20070627

Ending_Date: 20070830

Currentness_Reference: ground condition

Status:

Progress: In work

Maintenance_and_Update_Frequency: Continually

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.44

East_Bounding_Coordinate: -122.23

North_Bounding_Coordinate: 47.74

South_Bounding_Coordinate: 47.49

Keywords:

Theme:

Theme_Keyword_Thesaurus: Not applicable

Theme_Keyword: Orthophotography

Theme_Keyword: Orthoimagery

Place:

Place_Keyword_Thesaurus: Not applicable

Place_Keyword: King County; WA

Place_Keyword: Pacific NW

Place_Keyword: Washington state

Place_Keyword: United States

Place_Keyword: Southwestern Snohomish County

Access_Constraints:

Access to the data is limited to King County government agencies. The data is not to be redistributed in digital form to any other users or entities.

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: Mike Leathers

Contact_Organization: KCGIS-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

Browse_Graphic:

Browse_Graphic_File_Name:

<http://www.metrokc.gov/gis/sdc/raster/ortho/images/Ortho2007KCExtent.jpg>

Browse_Graphic_File_Description:

Extent of project area showing separate resolution areas by township

Browse_Graphic_File_Type: JPEG

Data_Set_Credit: Pictometry International Inc

Native_Data_Set_Environment: Windows; ArcGIS; ArcView; ArcInfo

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

There are no attributes associated with these raster data formats.

Logical_Consistency_Report:

Township-Range tiles are created from a mosaic of Pictometry's sector tiles. Some tiles will be a combination of 1.0 foot and 0.5 foot imagery.

Completeness_Report:

Tiles were created or all standard township-range tiles. The full extent of the project area imagery extends beyond the tile bounds in some areas. Zone and KeyRegion mosaics were created from all available data.

West county (Neigborhood) imagery was acquired from 20080627 through 20070815. East county (Community) imagery was acquired from 20070725 through 20080830. Image-by-image acquisition information is listed in spatial indexes that contain acquistion information. These indexes can be found in the Plibrary3>Reference>Indexes>Pictometry07 as:

staoblwaking07_cob_with_date (Standard Oblique WAKING07 Community Oblique with date) staoblwaking07_nob_with_date (Standard Oblique WAKING07 Neighborhood Oblique with date) staortwaking07_cor_with_date (Standard Ortho (vertical) WAKING07 Community Ortho (vertical) with date staortwaking07_nor_with_date (Standard Ortho (vertical) WAKING07 Neighborhood Ortho (vertical) with date

The date of each image is also part of the image file itself. The set of integers just before the file-type suffix (such as 070814) refers to standard form 20070814 or August 14 2007.

The Sector tiles are created from the underlying vertical (ortho) components. The dates associated with the images, either in their indexes, or in the file names themselves, refers to this post-acquisition construction date. Do not use these dates as an indicator of the image acquisition.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Forty-nine (49) ground control points, provided by KC Road Services, were identified on the imagery. X-Y coordinate points were collected and X and Y offset (Ground control minus Photo target) and RMS analysis was performed. X-error ranged from (-4.71 feet) to (3.54 feet). Y-error ranged from (-1.27 feet) to (8.83 feet). A graphic depiction of the control locations and the error can be found in <http://www.metrokc.gov/gis/sdc/raster/ortho/images/Pictometry2007ControlToPhotoRMSAnalysis.jpg>. A spreadsheet of the tabular information can be found at <http://www.metrokc.gov/gis/sdc/raster/ortho/Pictometry2007ControlToPhotoRMSAnalysis.xls>. Overall RMS (root-mean square error) is calculated as 1.45 feet (X) and 1.93 (Y).

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Not Applicable

Lineage:

Process_Step:

Process_Description:

Data acquired from Pictometry on a stand-alone server connected to the King County LAN.

Process_Date: 200802

Process_Step:

Process_Description:

The imagery was in Pictometrys sector tiling scheme. This data was not reclipped to King Countys standard 7500 tiling scheme. Instead, MrSid v6 project files were created from all sector tiles (approximately 0.5 x 0.5 miles square) that fall whole ar part into the township tile. These tiles were mosaicked into a single sid file at 20x compression. Because of the rotation inherent in the sector pieces, introduced during reprojection by Pictometry, the edges of the mosaics are not orthogonal and thus tile edges show black (0,0,0) masks.

Process_Date: 200802

Process_Step:

Process_Description:

Image data was imported into separate SDE raster feature dataset mosaics (GISPROD.Raster). REG_07NAT_050 contains the portion of the project at 0.5 foot (6 inch) resolution and REG_07NAT_100 contains the portion of the project at 1.0 foot resolution. Import parameters include jp2000 compression at 75% quality. Mosaics were pyramided upon completion of import using jp2000 compression.

Process_Date: 200805

Process_Step:

Process_Description:

All 0.5 foot resolution image tiles were resampled to 1.0 foot pixel using NEAREST NEIGHBOR. These were combined with the existing 1.0 foot resolution data to complete a full set of 1.0 foot resolution data for possible submission to the USGS for use in the National Map program. The original 1.0 foot resolution data has a TFW world file as originally supplied by Pictometry. However the imagery resampled from the 0.5 foot imagery used ArcTools GP tools that produced a GEOTIFF which do not have world files.

Process_Date: 200805

Process_Step:

Process_Description:

All 1.0 foot resampled imagery was resampled to 2.0 foot pixel resolution for use in creation of higher-level mosaics. This resolution was adopted after tests of creating required mosaics at 1.0 foot and 1.5 foot resolutions were not successful. Resampling was performed using NEAREST NEIGHBOR. The original 1.0 foot resolution data has a TFW world file as originally supplied by Pictometry. However all the imagery was resampled using ArcToolBox GP tools which produce a world file without a TFW.

Process_Date: 200805

Process_Step:

Process_Description:

King County Zone Tile mosaics were created from 2.0 foot resampled imagery. MrSid V5 software was used to create the level 3 mosaics with a compression ratio of 20x.

Process_Date: 200805

Process_Step:

Process_Description:

Multiple attempts were made to create a full project area (KEYREGION) mosaic from the imagery. Even at 2.0 foot resolution a single mosaic was not successful. Rather a west county mosaic (REG_07N050.sid) and an east county mosaic (REG_07N100.sid) were created. Keeping with general practice the last three integer values of the name reflect the GSD (ground sample distance) of the initial image resolution, not the resolution of the final mosaic. KEYREGION components are intended to represent a lower-resolution, large extent, version of the data set. In this case the west county mosaic approximates the extent of the original 0.5 foot resolution data and the east county mosaic approximates the extent of the original 1.0 foot resolution data. MrSid V5 was used to create the mosaics (level 3) using 50X compression

Process_Date: 200805

Process_Step:

Process_Description:

All original Pictometry sector tile data (the data used to create the draft orthos and all subsequent mosaics) was copied to Plibrary3 idxp7500 ORTHO_2007KC07_NAT folder. Even though these tiles are not in the King County standard scheme, they were placed here to serve as full-resolution source data archive.

Process_Date: 200805

Cloud_Cover: 1

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

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

Coordinate_Representation:

Abscissa_Resolution: 1

Ordinate_Resolution: 1

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

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Leathers

Contact_Organization: KC 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

Resource_Description:

txxryy_07n050.sid for 0.5 foot GSD resolution imagery. txxryy_07n100.sid for 1.0 foot GSD resolution imagery

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: 200802

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Leathers

Contact_Organization: KCGIS-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: firstname.lastname@metrokc.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998