NatcolorXXX.tif-Emerge Natural Color Derivative Aerial Photography

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: King County
Publication_Date: 20010126
Title:
NatcolorXXX.tif-Emerge Natural Color Derivative Aerial Photography
Edition: One
Geospatial_Data_Presentation_Form: Image digital data
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, a aerial photography firm. Licensing and use restrictions are part of this acquisition contract. Please contact the Point of Contact for licensing restrictions.
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 lat spring to early fall 2000 for western King County and southwestern Snohomish County. The data has a pixel size of 2 feet and is displayed in a natural color derivative for visual analysis
Purpose:
This image dataset comprises 373 individual image tiles stored in TIFF format that can be displayed as a single seamless mosaic. The images were converted from original 'False Color" near-infrared format to a natural color derivative. The imagery, within the horizontal accuracy and resolution limitations, serves as digital backdrop imagery for GIS and cartographic display. 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 datasets.
Supplemental_Information:
The images were created by converting original 'False Color' near-infrared TIFF images to a natural color derivative. It is considered a natural color derivative rather than a true natural color product as the original data is limited to 3-bands only, omitting the blue band. An algorithm was applied to the original data to closely mimic a natural color image. The images may be accessed as individual TIFF file by tile, as a pseudo-mosaic by using the associated image catalog dbase (emerge_nat.dbf) file, where supported, or as a single MrSid mosaic (emerge_nat.sid), where supported.

Detailed photodate information is not available. A general overview at the township-level for data capture dates can interpolated from www. "<http://www.metrokc.gov/gis/sdc/raster/ortho/images/ortho2000emergegeneralflightdate.jpg>"

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 200005
Ending_Date: 200009
Currentness_Reference: Acquisition date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.4505
East_Bounding_Coordinate: -121.6212
North_Bounding_Coordinate: 47.9738
South_Bounding_Coordinate: 47.1155
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: natural color imagery
Theme_Keyword: aerial photography
Theme_Keyword: Emerge
Theme_Keyword: Space Imaging
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: King County, WA (west)
Place_Keyword: Snohomish County, WA (southwest)
Place_Keyword: Washington
Place_Keyword: Pacific Northwest
Place_Keyword: Seattle, WA
Access_Constraints: Online access is restricted to King County GIS users.
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 Dept. of Information and Administrative Services. Specific constraints apply per the licensing agreement with Space Imaging.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: King County Dept 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., Suite 700
City: Seattle
State_or_Province: Washington
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-296-3775
Contact_Facsimile_Telephone: 206-296-3749
Contact_Electronic_Mail_Address: mike.leathers@metrokc.gov
Hours_of_Service: 8-4:30 PST M-F
Native_Data_Set_Environment:
Unix and Windows \images\emerge\nat\natcolorXXX.tif
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Logical_Consistency_Report:
Completeness_Report:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The raw images were georectified by the vendor using available 10m 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 4m (13.1 foot 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-third area has an error range from under 2 feet to 7 feet. See <http://www.metrokc.gov/gis/sdc/horiz_accuracy.htm>
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Process_Step:
Process_Description:
The images were received from the vendor on cdroms as 3-band (green, red, near-infrared) color infrared TIFF files. The imagery was delivered in 18 panels of 35 to 68 images. The original file name cocantenated the panel identifier (PPPPP), the date of acquisition in YYYYMMDDD format, and the tile identifier, XX. To facilitate processing of the data the files were renamed to tileXX.tif. Respective panel tiles were stored in separate directories and the acquisition data information was transferred to the index spatial coverage.
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 Dept of Natural Resources
Contact_Position: GIS Analyst, Water and Lands Resource Division
Contact_Address:
Address_Type: mailing and physical address
Address: 201 S. Jackson Street, Suite 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@metrokc.gov
Hours_of_Service: 8-4 PST M-F
Process_Step:
Process_Description:
The original projection parameters of the imagery were UTM zone 10, units meters, datum NAD83. The standard projection for King County is WA State Plane North, Zone 5601, units feet, datum HPGN. Directly reprojecting each individual image to to the King County standard would have resulted in rotation of the image, thus creating areas of 'no data' along portions of the edge of the image masks 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 squares 10,000 feet ona side. The tile coverage was created the ArcInfo generate command with the fishnet option. Separate one-band grids were then reprojected and retiled in aroving window. This roving window choose, 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.
Source_Used_Citation_Abbreviation: tileXXX.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 Dept of Natural Resources
Contact_Position: GIS Analyst, Water and Lands Resource Division
Contact_Address:
Address_Type: mailing and physical address
Address: 201 S. Jackson Street, Suite 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@metrokc.gov
Hours_of_Service: 8-4 PST M-F
Process_Step:
Process_Description:
The original images, as reprojected and retiled, still displayed as 'False Color' color infrared images. While color infrared images are useful for image classification of imagery and some visual analyses, most casual users of imagery expect something that looks like a normal photograph. Three-band color infrared images cannot be viewed as true color because they lack the blue visual spectrum. To create a simulated true color image, additional processing was performed. An algorithm was developed in ArcInfo AML macro language that mimics the ERDAS natural color model. The algorithm was applied to the retiled images to produce a natural color derivative. The initial derivative lacked an adequate contrast stretch and thus appeared overly dark. Additional experimentation developed a standard deviation contrast stretch applied using the SLICE command in ArcInfo grid to trim the higher end of the digital number range. This reduced slightly the full spectral range of the image, yet significantly improved the overall viewability of the imagery.
Source_Used_Citation_Abbreviation: imageXXX.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 Dept of Natural Resources
Contact_Position: GIS Analyst, Water and Lands Resource Division
Contact_Address:
Address_Type: mailing and physical address
Address: 201 S. Jackson Street, Suite 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@metrokc.gov
Hours_of_Service: 8-4 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 1983
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:
Ordinate_Resolution:
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. Information regarding the collection parameters for the imagery may be found in the metadata for the Color Infrared version of the files as well as in the metadata for the spatial index for this dataset - idxpemer.shp
Entity_and_Attribute_Detail_Citation:
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. , Suite 2300
City: Seattle
State_or_Province: Washington
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-263-5220
Contact_Facsimile_Telephone:
Contact_Electronic_Mail_Address: cheryl.wilder@metrokc.gov
Hours_of_Service: 8:00-5:00 PST M-F
Resource_Description:
natcolorXXX.tif where XXX references a tile_id linked to a single polygon location 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 that which it was designed.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: TIFF image format
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Format:
Compatibility_Information:
Fees:
Ordering_Instructions:
Metadata_Reference_Information:
Metadata_Date: 20010126
Metadata_Review_Date:
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, Suite 700
City: Seattle
State_or_Province: Washington
Postal_Code: 98104
Country: USA
Contact_Voice_Telephone: 206-296-3775
Contact_Facsimile_Telephone: 206-296-3749
Contact_Electronic_Mail_Address: mike.leathers@metrokc.gov
Hours_of_Service: 8:00-4:30 M-F
Metadata_Standard_Name: FGDC CSDGM
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.7.17 on Wed May 28 15:27:05 2008