Colleagues: I am looking for people willing to let me borrow/use stem maps of northern hardwoods (primarily sugar maple, yellow birch, hemlock + associates, but sugar maple-beech stands would be ok as well). I am attempting to simulate gap dynamics with local density (i.e., sum of individual tree basal areas within a certain distance surrounding a given point) estimates, and stem maps are a more accurate means in which to create stands that generating the data on a computer. The data I actually need are x and y coordinates, species, and d.b.h.- any stem map file contain at least this level of information would be sufficient. I can extract/format the data to my specific requirements if the file is not set up as such, so all I would need is a description of file set up. DOS ASCII files are definitely preferred, although I could also work with Sun or Mac files (as long as I know the format). Larger stands (> several hectares) would also suit me best, but, hey, beggars can't be choosers. Alan Ek has already graciously provided me with a stem map from Ontario that worked perfectly. In return for this data, I will be willing to share my results and provide you copies of the short, simple FORTRAN programs I have written to analyze the files. I am also willing to mail you a blank, preformatted (assuming PC-compatible files) diskette and a self-addressed, stamped disk mailer so you don't incur any mailing expenses, and will consult with you first if I want to further use your stem maps. Any other references on the use of local density to simulate gap dynamics would be appreciated (regardless of forest type). Please respond directly to me via email: dbragg@geog.usu.edu or by snail-mail: Don C. Bragg Department of Forest Resources and Ecology Center Utah State University Logan, UT 84322-5215 Thanks in advance, Don
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