To expand on one of the points that Mr Schlechte made regarding measuring distance along the stream, I suggest you get a copy of Pierre Goovaerts publication from ES&T. Unfortunately, I don't have the citation but the subject was applying geostatistics to the Passaic (?) River in NJ and it was published in 2001 or 2002. The paper addresses transforming coordinates to account for stream meandering. Bill
At 08:37 AM 5/2/02 -0500, Warren Schlechte wrote: >Maureen, > >I believe we met in Savannah a couple of years ago. If you don't mind, >could you send me any responses you get as a summary? Such seems useful to >know - how to best deal with boundary conditions. It would seem from my >neophyte position that such would be easy to do. First, you don't provide >any data from the adjacent land. Hence the estimation of the variogram won't >take anything but stream readings into account. Second, when you provide a >grid to estimate over, only provide points that lay within the stream. One >item you will want to consider is how you portray your grid. Since a stream >is a self-contained entity, I would think that distance should be portrayed >as distance within the stream, distance as the water flows, not distance as >the crow flies. Another aspect you may wish to consider is that streams >have direction. Hence, it would seem unusual (with the exception of large >inflows) for downstream sites to ever have an effect on upstream sites. >This would suggest all sites should only look upstream for temperature >information. The final item that comes to mind quickly is the influence of >inflow. These will be sources of different temperatures than exist in the >main stream basin. As such, it would seem that any major inflows should be >measured. > >Hope that my thought help, and that you get the help you need from this >group. > > >Warren Schlechte > > -----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf >Of Maureen Walsh >Sent: Wednesday, May 01, 2002 9:35 PM >To: [EMAIL PROTECTED] >Subject: AI-GEOSTATS: Kriging a stream surface > > << File: vcard.vcf >> I am interested in using kriging to interpolate >temperature surfaces for >a stream that I work on, based on data from fixed point temperature >loggers along the length of the stream. However, I am unsure if it is >possible to constrain the analysis within the stream boundaries. I was >wondering if anyone with experience conducting these types of analyses >would have any suggestions about how to address this problem. >Thank you very much, >Maureen Walsh > > >-- >* To post a message to the list, send it to [EMAIL PROTECTED] >* As a general service to the users, please remember to post a summary of >any useful responses to your questions. >* To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and >"unsubscribe ai-geostats" followed by "end" on the next line in the message >body. DO NOT SEND Subscribe/Unsubscribe requests to the list >* Support to the list is provided at http://www.ai-geostats.org ************************************************** William C. Thayer, P.E. Environmental Science Center Syracuse Research Corporation 301 Plainfield Road, Suite 350 Syracuse, NY 13212 phone: (315) 452-8424 fax: (315) 452-8440 email: [EMAIL PROTECTED] web: http://esc.syrres.com/ http://esc.syrres.com/geosem/ ************************************************** -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
