(and link back to project page)
Metadata:
| Project (and link back to project page) |
Bare Earth DEM | Top
Surface DEM |
Bare Earth ASCII | DEM All Returns ASCII |
| Yakima County 2003 |
|
|
|
|
| Lewis County 2003 |
|
|
|
|
| Portland 2004 |
|
|
|
|
| Lower
Columbia River 2005 |
|
|
||
Disclaimer: We have taken
considerable care to ensure that these topographic survey 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 modeling, 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. Users
should carefully determine the place-to-place accuracy and fitness of
these data for their particular purposes. For many purposes a site- and
use-specific field survey will be necessary.