GIS Data Catalog

2000 Emerge Color Infrared Aerial Photography

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Summary

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.

Description

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.

Layer information

Layer Name	IMAGE_Ortho2000EmergeCIR
Subject Category	Imagery
Title	2000 Emerge Color Infrared Aerial Photography
Feature Count	1
Feature Type	Raster
Spatial reference	None
Control ID	None
Place Keywords	None
Theme Keywords	None
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

Attribute information

OBJECTID From Esri	Description Internal feature number. Domain Sequential unique whole numbers that are automatically generated.
Shape From Esri	Description Feature geometry. Domain Coordinates defining the features.
Shape_Length From Esri	Description Length of feature in internal units. Domain Positive real numbers that are automatically generated.
Shape_Area From Esri	Description Area of feature in internal units squared. Domain Positive real numbers that are automatically generated.
MosaicID No Source Noted	Description Not Found Domain Not Found

Contact information

Maintained by	KCGIS Center
Primary	KCGIS Center giscenter@kingcounty.gov

Terms of Use

License	Terms of use and copyright