histogram of SpatialGridDataFrame values
More simply perhaps you can get any column by name or number like any data.frame - this gives all pixel values for the first attribute (assuming first colname is the default - use names(dem) to find out): dem$band1 dem[[1]]
On Fri, Aug 5, 2011 at 12:04 PM, Nick Matzke <matzke at berkeley.edu> wrote:
Nevermind, got it: as.matrix(dem) On 8/4/11 5:06 PM, Nick Matzke wrote:
Hi, So I've loaded a DEM into a SpatialGridDataFrame, and I can plot it etc. However, I would like to make a histogram of the pixel values (or just a random sample of the pixel values) to help make decisions about the color scheme etc. Is there an easy way to do this? Cheers! Nick
-- ==================================================== Nicholas J. Matzke Ph.D. Candidate, Graduate Student Researcher Huelsenbeck Lab Center for Theoretical Evolutionary Genomics 4151 VLSB (Valley Life Sciences Building) Department of Integrative Biology University of California, Berkeley Graduate Student Instructor, IB200B Principles of Phylogenetics: Ecology and Evolution http://ib.berkeley.edu/courses/ib200b/ http://phylo.wikidot.com/ Lab websites: http://ib.berkeley.edu/people/lab_detail.php?lab=54 http://fisher.berkeley.edu/cteg/hlab.html Dept. personal page: http://ib.berkeley.edu/people/students/person_detail.php?person=370 Lab personal page: http://fisher.berkeley.edu/cteg/members/matzke.html Lab phone: 510-643-6299 Dept. fax: 510-643-6264 Cell phone: 510-301-0179 Email: matzke at berkeley.edu Mailing address: Department of Integrative Biology 3060 VLSB #3140 Berkeley, CA 94720-3140 ----------------------------------------------------- "[W]hen people thought the earth was flat, they were wrong. When people thought the earth was spherical, they were wrong. But if you think that thinking the earth is spherical is just as wrong as thinking the earth is flat, then your view is wronger than both of them put together." Isaac Asimov (1989). "The Relativity of Wrong." The Skeptical Inquirer, 14(1), 35-44. Fall 1989. http://chem.tufts.edu/AnswersInScience/RelativityofWrong.htm
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Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsumner at gmail.com