These LIDAR (LIght Detection And Ranging) data were acquired by EagleScan 
Incorporated on October 22 and 23, 1998 and September 18-22, 1999, on 
behalf of the U.S. Geological Survey. 

The data are part of a survey of the Snoqualmie River valley and adjacent 
uplands, in Washington State, between Monroe and North Bend, including 
all or part of the Carnation, Fall City, Issaquah, Maltby, Monroe, and 
Snoqualmie 7.5-minute quadrangles.

Projection\Coordinate\datum info:

	Horizontal datum = NAD83
	Vertical datum = NAVD88
	Map projection = UTM
	UTM zone = 10
	Units = meters
	ZUnits = meters

Gridded elevation data (DEMs) and geo-registered shaded relief images are 
available online at http://pugetsoundlidar.org

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Flight altitude = (+/- 500) 6000 ft. above ground level

Filtering: All data were run through 'Veglay'. This process relayered any 
points that had greater 'z' value than surrounding points (according to a 
specified slope threshold). Points that were inadvertently relayered were 
manually replaced in the data set. Then, using .5m contours as reference, 
remaining building and tree features were manually removed.

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Disclaimer
----------
Considerable care has been taken to see that these data and derived 
images are as accurate as possible. We believe most of these data are 
adequate for determination of flood hazards, for geologic mapping, for 
hydrologic modelling, for determination of slope angles, for modelling of 
radio-wave transmission, and similar uses with a level of detail 
appropriate to a horizontal scale of 1:12,000 (1 inch = 1,000 feet) or 
smaller and vertical accuracy on the order of a foot. Locally, the data 
are of considerably poorer quality.

You should carefully determine the place-to-place accuracy and fitness of 
these data for your particular purposes. For many purposes a site- and 
use-specific field survey will be necessary.


					Enjoy!
					The Puget Sound LIDAR Consortium