2012 High-Resolution Natural Color Orthoimagery for the Puget Sound Region (WA) NGA Urban Area

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: King County

Publication_Date: 20130523

Publication_Time: 000000

Title:

2012 High-Resolution Natural Color Orthoimagery for the Puget Sound Region (WA) NGA Urban Area

Edition: One

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: 201 S Jackson St, Ste 706, Seattle, WA, 98104, USA

Publisher: King County

Description:

Abstract:

High-resolution, digital natural color orthoimagery for the Puget Sound, WA region NGA urban area. Comprises approximately 2530 square miles in western Washington (western King County and parts of Snohomish, Pierce, Kitsap, Thurston and Mason Counties). The orthoimagery is provided as1/3 meter resolutionl, 3-band, RGB GeoTiff images. The imagery was collected between March 23, 2012 and May 8, 2012.

Purpose:

The U.S. Geological Survey (USGS), as the domestic mapping agency of the United States, needs to obtain current high-resolution orthoimagery coverage over the Puget Sound urban area to meet the needs of Federal partners over 133 urban areas, including the implementation of The National Map. This imagery is collected on behalf of the National Geospatial Intelligence Agency (NGA).
Through this agreement, the USGS will provide funding to King County as part of the local orthoimagery consortium in order to have the region’s 2012 high-resolution digital orthophoto imagery made available in the public domain for access by Federal partners and a broader audience of users through The National Map.

Supplemental_Information:

The NGA project area is part of a larger project, the 2012 Aerial Mapping Project. The larger project area is approximately 4078 square miles, and encompasses the NGA area plus eastern King County and additional areas of Snohomish and Pierce Counties. The relationship between the two project areas is shown in this project area map - <http://www5.kingcounty.gov/sdc/raster/ortho/images/RegionalMapping_NGA_2012_ProjectExtents.pdf>

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20120323

Beginning_Time: 000000

Ending_Date: 20120508

Ending_Time: 000000

Currentness_Reference:

Ground Condition. Date and time information for when imagery was collected is available. The King County GIS Data Portal site provides access to ORTHO_IMAGE12_POINT as a shapefile or GDB featureclass. This dataset provides an index to all images collected for the entire 2012 Aerials Mapping Project including information about photo time and date. The portal site can be reached at <http://www5.kingcounty.gov/gisdataportal/Default.aspx>

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -123.026880

East_Bounding_Coordinate: -121.837562

North_Bounding_Coordinate: 46.857915

South_Bounding_Coordinate: 48.132255

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: NGA

Theme_Keyword: Orthoimagery

Theme_Keyword: USGS

Theme_Keyword: 2012 Aerials Mapping

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Washington State

Place_Keyword: Puget Sound

Place_Keyword: Snohomish County

Place_Keyword: King County

Place_Keyword: Pierce County

Place_Keyword: Thurston County

Place_Keyword: Mason County

Place_Keyword: Kitsap County

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: imageryBaseMapsEarthCover

Access_Constraints: None

Use_Constraints:

All 12-inch deliverable data and documentation will be free from restrictions for internal USGS use, and distribution to the National Geospatial- Intelligence Agency (NGA). Derivative 2-foot data and documentation provided under this task order shall be free from restrictions regarding USGS use and distribution and shall be freely distributable by government agencies in the public domain.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS Center

Contact_Person: Mike Leathers

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Ste 706

City: Seattle

State_or_Province: WA

Postal_Code: 98155

Country: USA

Contact_Voice_Telephone: 206-263-4867

Browse_Graphic:

Browse_Graphic_File_Name:

<http://www5.kingcounty.gov/sdc/raster/ortho/images/RegionalMapping_NGA_2012_ProjectBrowseSample.pdf>

Browse_Graphic_File_Description: Sample of 1/3 meter imagery

Browse_Graphic_File_Type: PDF

Data_Set_Credit: Mapcon Mapping, Inc

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.3.3600

Data_Quality_Information:

Logical_Consistency_Report:

Each UTM pixel represents a resampling of the original State Plane RGB image pixel.

Completeness_Report:

Ortho tiles provide complete coverage to the extent of the NGA Urban Area footprint project area. Each tile in the National Grid spatial index covering the NGA project area has one TIF tile identified as 10TET######.tif, with a corresponding TFW tile. Tiles are all complete imagery except for some bounding tiles where the NGA UTM tiling index does not exactly align with the 2012 Aerials project area.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Ground control and monument information used in the project was compiled. This included control that was used in the Aerial Triangulation build as well as other points. Although not all project areas were equally represented by control, the distribution of points was adequate to confirm the horizontal accuracy of the data.
A total of 514 control points were matched to visible targets or other identifiable landmarks in the imagery.
Analysis was performed on the original orthoimage product produced in three resolutions in WA State Plane projection. The 0.25 foot area was evaluated for 395 control points, the 0.50 foot area contained 91 control points and 1.00 foot area contained 28 control points.
Each resolution was evaluated independently. A standard Root Mean Square (RMS) analysis was performed for each the X differential and the Y differential
For the 0.25 foot imagery, the RMS error was 0.3104 feet in the X dimension and 0.3101 in the Y dimension. The specification for this resolution is 0.4 foot at 90%; therefore the imagery meets specification.
For the 0.50 foot imagery, the RMS error was 2.524 feet in the X dimension and 1.3302 feet in the Y dimension. The specification for this resolution is 3.208 feet at 95%; therefore the imagery meets specification.
For the 1.00 foot imagery, the RMS error was 1.2921 feet in the X dimension and 0.8587 feet in the Y dimension. The specification for this resolution is 5.0 feet at 95%; therefore the imagery meets specification.
After processing the imagery from the original resolution in State Plane to the UTM 1/3 meter product, these accuracy results translate into an acceptable result required by the NGA specifications of a Horizontal Accuracy not to exceed 5 feet RMSE (X or Y).

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Publication_Date: 20121228

Publication_Time: 000000

Title: Digital stereo and digital orthoimagery

Geospatial_Data_Presentation_Form: document

Type_of_Source_Media: hardDisk

Source_Citation_Abbreviation: Digital stereo and digital orthoimagery

Source_Contribution: Mapcon Mapping

Process_Step:

Process_Description:

Mapcon Mapping established a flight plan and ground control plan to acquire orthoimagery at 3 resolutions across the Aerial Mapping project area. Three aircraft were used. Two aircraft were used to acquire in the 0.25 foot area and the other acquired in the 0.50 foot and 1.00 foot areas. Both aircraft in the 0.25 foot area used an UltraCamX camera - one which was calibrated 1/6/12 and the other 12/20/10. The aircraft in used for the 0.50 and 1.00 foot areas used an UltraCamXp camera calibrated 5/25/11. Unrectified stereo imagery was delivered for inspection and acceptance. Aerial Triangulation (AT) blocks were created and provided for review. Detailed evaluation of the AT models were performed in selected areas of the 0.25 foot collection, and selected stereo pairs in the 0.50 and 1.00 foot areas were also evaluated using softcopy 3D workstation software. Once accepted, updates to the Digital Elevation Model (DEM) were performed over a large portion of the 0.25 project area. Once the DEM work was finished, ortho production began. State Plane orthoimagery was delivered at three resolutions: 0.25, 0.50 and 1.00 feet.

Process_Date: 20121228

Process_Time: 000000

Process_Step:

Process_Description:

To create the UTM 1/3 meter product for the USGS/NGA delivery, the following steps were performed. 1. Combine RGB tifs into one NAD83 HARN Stateplane (SP) Washington North mosaic data set. 2. Identify which 3000 foot tiles in the SP index that lay within the USGS Area Of Interest (AOI) 3. Select SP tile polygon, buffer 12 feet. 4. Extract SP image by buffered tile, resample to .984252 feet (.3 meter) using Bilinear method. 5. Reproject buffered SP image into NAD1983 UTM Zone 10. 6. Clip buffered UTM image with unbuffered tile for clean edge. 7. Copy 16bit UTM RGB image back to 8bit unsigned RGB image with world file and overview files.
After completion of the UTM tiles, a MrSid lossless version of each tile was created for review. Areas already extensively reviewed by other participants were inspected briefly and areas that were not in participant overlap areas were reviewed to determine that the imagery met the specifications in the scope of work in the USGS/NGA project definition.

Process_Date: 20130430

Process_Time: 000000

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 5001

Column_Count: 5001

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 UTM Zone 10N

Transverse_Mercator:

Scale_Factor_at_Central_Meridian:

Longitude_of_Central_Meridian:

Latitude_of_Projection_Origin:

False_Easting:

False_Northing:

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000002220024164500956

Ordinate_Resolution: 0.000000002220024164500956

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County GIS

Contact_Person: Mike Leathers

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Ste 706

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

Distribution_Liability: See access and use constraints information.

Metadata_Reference_Information:

Metadata_Date: 20130523

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County

Contact_Person: Mike Leathers

Contact_Position: GIS Data Coordinator

Contact_Address:

Address_Type: mailing and physical

Address: 201 S Jackson St, Ste 706

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 Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time