NOAA CSC Willapa Bay LiDAR Coverage
Data Available at: NOAA CSC Topographic
Mapping Website
A zipped extent shapefile may be obtained here (if you have difficulty, try right click and ‘save target as…’)
Projection: NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602, Units Foot_US
Physical Description
Projection: Selectable on LDART form.
Vertical Datum: NAVD88, Units Meters, resolution 0.01 Meter (1 Centimeter)
As part of an examination of the impacts of invasive Spartina
alternaflora in Willapa Bay, Washington, the Center contracted LiDAR
collection for the bay during lower low-water conditions. The data cover an
area of approximately 10 miles east-west by 20 miles north-south and was
collected in the spring of 2002. A licensed land surveyor conducted an
independent ground truth survey on relatively flat bare ground around the bay.
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Specifications |
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Vertical
accuracy: |
12.8 centimeter root mean square error |
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Horizontal
accuracy: |
21 centimeter root mean square error |
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Nominal Ground
Spacing: |
3 meters |
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Ancillary
Mission Information: |
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Data Classes
Available: |
Unclassified |
Courtesy NOAA CSC
Additional Information
These are single-return nonpenetrating LiDAR data.
These data were collected over three days, timed for the lowest tide during the period of collection. Collection on each of the three days occurred in the north, central, and south end of the bay respectively, with lowest tide and best tideland coverage in the north. The central and southern flights collected tidelands data at progressively higher tide levels with respect to the northern zone.
Other Useful Information
Keep in mind that these are point data. It will be necessary to post process these data to generate a terrain model.
From the NOAA CSC TM website, your data search will take you to the LDART form, which is a Java – based application.
You can define the extent of interest either directly using the ‘Refine Extent’ button, or you may enter the extent in Decimal Degrees (DD) in the bounding coordinate boxes. If you are going to tile your downloads, using the bounding box coordinates might be the best approach. Use the map at the top of this page to obtain DMS coordinates for each tile you wish to download, convert to DD, expand slightly to ensure that there will be no gaps between your tiles, and enter in the boxes provided on the LDART form.
Keep in mind that the ‘minimum’ bin method is best for ‘bare terrain’ modeling.
Questions? Commemts?
Contact Keven Bennett kbenet@u.washington.edu