Update Report

March 10 , 2000

Author: Ami Arthur

During the last week of January, Ken, Gina, and I attended the National Elevation Dataset Hydrologic Derivatives (NED-H) Collaborators' meeting at the EROS Data Center in Sioux Falls, SD. Also in attendance from the NWS was Seann Reed from the Office of Hydrology. The meeting included over 30 representatives from the USGS, EPA, state agencies, the University of Wyoming, and ESRI. Most of these people have been involved at some level in developing hydrologic datasets, often as part of a NED-H pilot study. For more information about the NED-H project and details of the meeting, please see Seann's summary.

During the trip, we also had a chance to meet with Kris Verdin and others at EROS to discuss details of data transfer, the Pfafstetter ID, and other issues specific to our blind pass processing. In addition, Seann and I met again to discuss the parameters OH would like to obtain. Seann has since provided ARC/INFO AML scripts to us for this purpose. After processing several HUCs, I do not think the time requirements for extracting these parameters will be a significant issue.

The week following the meeting, EROS sent Dean Tyler (their NED-H AML programmer) to meet with us at NSSL. He worked with us for two days to ensure that we have a good understanding of the basin delineation scripts and how to use them. During the weeks following Dean's visit, we have been iterating with him to perfect these scripts. As of last week, they appear to be in their final form with the exception of the Pfafstetter basin coding which Kris Verdin is still working on. However, because the Pfafstetter coding will be processed separately from the main basin delineation scripts, we can proceed into production mode without it for now. EROS has sent additional NED data for the Eastern Region, Arizona, and New Mexico, and we will be making another data request for other areas shortly.

Please note the new WFO site status table which can be accessed from the main National Basin Delineation Project page. A status graphic of completed HUCs will also be included soon, and both will be updated every week.