In article <9410101305.AA20494@lucano.uco.es>, you write:

Hi:

I am making a program, and I need an algorithm to calculate the watershed basin

upstream of a outlet point. I know an algorithm that was documented in GRASS

manuals but doesn't exist, this algorithm was named r.water.outlet.

I would like to have the source code or the A* Search Algorithm to Develop

Hydrologic Models from Digital Elevation Data (Charles Ehlschlaeger, U.S. Army

Construction Engineering Research Laboratory)

Thanks in advance.

Gonzalo Carrero Perez.

If you manage to get a copy of the algorithm could you please send a

copy to me se4ap@dmu.ac.uk. I believe my friend is doing a project that

would be greatly helped by that algorithm. Or any other algorithm

involving water flow.

His project is concerning displaying the effects of water flow over time

Thanks in advance

Andrew (Peachy) Pearce.

A Pearce (se4ap@de-montfort.ac.uk) writes on 13 Oct 94:

In article <9410101305.AA20494@lucano.uco.es>, you write:

I would like to have the source code or the A* Search Algorithm to Develop

Hydrologic Models from Digital Elevation Data (Charles Ehlschlaeger, U.S. Army

Gonzalo Carrero Perez.

If you manage to get a copy of the algorithm could you please send a

copy to me se4ap@dmu.ac.uk. I believe my friend is doing a project that

would be greatly helped by that algorithm. Or any other algorithm

involving water flow.

I'm not sure of the specifics of water flow, but the A*

algorithm is used in lots of places. You can find an

explanation, psuedo-code, and LISP implementation in:

@Book{ tanimoto87,

author = "Steven L. Tanimoto",

title = "The Elements of Artificial Intelligence: An

Introduction using {LISP}",

publisher = "Computer Science Press",

year = "1987",

editor = "Algred V. Aho and Jeffery D. Ullman",

volume = "11",

series = "Principles of Computer Science Series"

}

--Darrell

James Darrell McCauley, Purdue Univ, West Lafayette, IN 47907-1146, USA

mccauley@ecn.purdue.edu, mccauley%ecn@purccvm.bitnet, pur-ee!mccauley

http://soils.ecn.purdue.edu/~mccauley