ImageXXX.tif - Emerge Color Infrared Aerial Photography

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information
• City
• Country
• City
• Country

Identification_Information:

Citation:

Citation_Information:

Originator: King County

Publication_Date: 20010501

Title: ImageXXX.tif - Emerge Color Infrared Aerial Photography

Edition: One

Geospatial_Data_Presentation_Form: Map

Publication_Information:

Publication_Place: King County, WA

Publisher: King County

Other_Citation_Details:

This dataset was collected as part of a larger multispectral image acquisition effort contracted through Pacific Meridian Corporation, a subsidiary of Space Imaging, Inc The Emerge dataset component was captured and delivered to Pacific Meridian by Emerge, Inc, an aerial photography firm. Licensing and use restrictions are part of this acquisition effort. Please contact the Point of Contact for licensing restrirctions.

Online_Linkage:

Larger_Work_Citation:

Citation_Information:

Originator: King County

Publication_Date: 2000

Title: ESA/SAO Multispectral Image Acquisition

Publication_Information:

Publication_Place: King County, WA

Publisher: King County

Online_Linkage:

Description:

Abstract:

Low elevation, high resolution (i.e, small ground-sample-distance (GSD)) aerial photography collected in late spring to early fall 2000 for western King County and southwestern Snohomish County (approx. 1170 sq. miles). The data has a pixel sixe of 2 feet. The data is 8-bit,three band (green, red, near infrared) and displays for default viewing in ArcView as an infrared ('false color') display. A natural color derivative version has also been made available and is described in separate metadata.

Purpose:

This image dataset comprises 373 individual image tiles stored in TIFF format that can be displayed as a single seamless mosaic. The imagery, within the horizontal accuracy and resolution limitations, serves as digital backdrop imagery for GIS, cartographic production and image analysis. In particular, the absolute and relative horizontal accuracy should be carefully considered when either determining coordinate positions or when applying the data relative to other spatial data.

Supplemental_Information:

The images are provided in the their original 3-band 'false color' version as delivered by the vendor. The data was reprojected as discussed in the process section, but no additional image enhancement nor display adjustments was performed. Pyramid files were created to improve displaly performance in Erdas and ArcView Image Analyst. The .rrd pyramid files are stored with the data or available on supplemental CDROM accompanying the data. The images can be accessed as individual TIFFs file by file, as a pseudo-mosaic by using the associated image catalog dbase file (emerge_cir.dbf), where supported. Each image tile covers approximately 3.58 sq. miles, are is approximately 75 mb in size. The entire dataset requires approximately 22.6 gb of storage for the TIFF and TFW files, with another 4 gb required for the RRD pyramid files. The actual file count of 373 image files does not match the filename maximum

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: None

Logical_Consistency_Report: None

Completeness_Report:

The 373 image tiles in the dataset cover the entire area of interest (AOI) as supplied by King County to the Vendor. The portion of Snohomish County that is covered with this dataset is that part of WRIA (Watershed Resource Inventory Area) 8 that extends from King County into Snohomish County. The AOI, however, did not provide for any buffer at the edges of this WRIA nor along any of the other AOI edges, either with adjacent counties or Puget Sound. For this reason the imagery is truncated abruptly along these edges. Also due to this truncation along Puget Sound, there is no or very little extension of the imagery into the near shore zone.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The raw images were georectified by the vendor using available 10 m DEM supplemented by limited GPS ground control. After delivery of the tiled images, in-house horizontal accuracy analysis indicated that the data met the contract specification for 1:10000 NMAS with a CE90 of 4 m (13.1 feet) accuracy. However the absolute accuracy varies significantly across the project area. In general, areas in the northern one-third of the project area exhibit greater variance from known ground control than in the balance of the project area. The error allowance in the northern one-third area approaches the CE90 limit, while the southern two-thirds area has a error range from under 2 feet up to 7 feet.

Vertical_Positional_Accuracy:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

Publication_Date:

Edition:

Geospatial_Data_Presentation_Form: image

Publication_Information:

Publication_Place:

Publisher:

Other_Citation_Details:

Online_Linkage:

Larger_Work_Citation:

Citation_Information:

Originator:

Publication_Date:

Title:

Publication_Information:

Publication_Place:

Publisher:

Online_Linkage:

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Process_Step:

Process_Description:

The images were received from the vendor on CD-ROM as 3 band (green, red, near infrared) 'false color' images as as a single TIFF file with world file. The imagery was delivered

Source_Used_Citation_Abbreviation: PPPPP_YYYYMMDD_tileXX.tif

Process_Date: 200012

Source_Produced_Citation_Abbreviation: tileXX.tif

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Ken Rauscher

Contact_Organization: King County Department of Natural Resources

Contact_Position: GIS Analyst, Water and Lands Resource Division

Contact_Address:

Address_Type: mailing and physical address

Address: 201 S. Jackson St, Ste 700

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-296-1922

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: ken.rauscher@kingcounty.gov

Hours_of_Service: 8:00-4:00 PST M-F

Process_Step:

Process_Description:

The original project parameters of the imagery were UTM zone 10, units meters, datum NAD83. The standard projection for King County is WA State Plane North, Zone 5061, units feet, datum HPGN. Directly reprojecting each individual tile to the King County standard would have resulted in rotation of the image, thus creating areas of 'no data' along portions of each edge of the image which would have masked part of the adjacent image. Therefore the images had to be retiled as well as reprojected. To project the images, it was necessary to convert each image from TIFF format to ArcInfo grid format. Converting a 3-band image results in a grid stack comprised of three grids. A new tiling scheme was created of squares 10,000 feet on a side. The tile coverage was created using ArcInfo's generate command with the fishnet option. Separate one-band grids were then reprojectec and retiled in a roving window. This roving window chose, in turn, each polygon in the newly created tiling scheme. The appropriate one-band grids were merged, projected and clipped with the tiling scheme in the King County projection. When, for a given polygon, all three grid bands were completed, a grid stack was made from the three bands. The grid stack was then converted to a 3-band TIFF image using the ArcInfo gridimage command. When the images were clipped to the new tiling scheme, a 250 foot buffer was added to the tile polyon extent, so that the image has some small overlap with adjacent images.

Source_Used_Citation_Abbreviation: tileXX.tif

Process_Date: 200012

Source_Produced_Citation_Abbreviation: imageXXX.tif

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Ken Rauscher

Contact_Organization: King County Department of Natural Resources

Contact_Position: GIS Analyst, Water and Lands Resource Division

Contact_Address:

Address_Type: mailing and physical address

Address: 201 S. Jackson St, Ste 700

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-296-1922

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: ken.rauscher@kingcounty.gov

Hours_of_Service: 8:00-4:00 PST M-F

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 5100 (representative)

Column_Count: 5100 (representative)

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:

Planar_Distance_Units: Feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

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 imagery are stored as raster TIFF format files. They have no attribute table. The Vendor supplied no metadata information except for acquisition date when the data was delivered. Subsequent inquiries regarding the data have produced some general background information on the capture and sensor parameters.The sensor used is Eastman Kodak DSC460CIR imager with a 3072 x 2048 pixel focal plan array. The sensor incorporates a bandpass filter on the lens that has a -3dB cutoff for wavelengths of less than 500 nm and greater than 800 nm. Blue light is outside the filter's bandpass, so that none of the incident blue light reaches the sensor. The red,green and blue filter elements are all transparent to the reflected NIR radiance passed in the 700 to 800 nm region. Thus, the green filtered pixels respond to green and NIR, the red filtered array elements respond to red plus NIR radiance, while the blue-filtered pixels respond to NIR radiance only. The results obtained by

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County

Contact_Person: Cheryl Wilder

Contact_Position:

Contact_Address:

Address_Type: mailing and physical address

Address: 700 5th Ave, Ste 2300

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-263-5220

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: cheryl.wilder@kingcounty.gov

Hours_of_Service: 8:00-5:00 PST M-F

Resource_Description:

imageXXX.tif where XXX references a tile_id linked to a single polygon in idxpemer.shp index scheme

Distribution_Liability:

The King County Department of Information and Administrative Services disclaims any warranty of use of any digital product beyond which it was designed.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: TIFF image format with TFW world file and RRD pyramid file

Digital_Transfer_Option:

Offline_Option:

Offline_Media: CD-ROM

Metadata_Reference_Information:

Metadata_Date: 20010501

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: King County Department of Natural Resources

Contact_Person: Michael Leathers

Contact_Position: GIS Database Administrator

Contact_Address:

Address_Type: Mailing and physical address

Address: 201 S. Jackson St, Ste 700

City: Seattle

State_or_Province: WA

Postal_Code: 98104

Country: USA

Contact_Voice_Telephone: 206-296-3775

Contact_Facsimile_Telephone: 206-296-3749

Contact_Electronic_Mail_Address: mike.leathers@kingcounty.gov

Hours_of_Service: 8:00-4:30 PST M-F

Metadata_Standard_Name: FGDC CSDGM

Metadata_Standard_Version: FGDC-STD-001-1998

City: Seattle

Country: US

City: Seattle

Country: US