A few years ago, I work with Stuart Gage who had developed a Heat / Precipitation Index as a measure of drought severity. It works just as well if not better than the Palmer Drought Index.
You can find the formula in this only pdf report: Climate Variability in the North Central Region: http://goes.msu.edu/publications/pdfs_ps/CGCEO%2085.pdf Google search: Stuart Gage Heat Precipitation Index If you can not download the file. Write to me individually and I'll send it directly. Steve Steve Friedman Ph. D. Spatial Statistical Analyst Everglades and Dry Tortugas National Park 950 N Krome Ave (3rd Floor) Homestead, Florida 33034 steve_fried...@nps.gov Office (305) 224 - 4282 Fax (305) 224 - 4147 Muhammad Rahiz <muhammad.ra...@o uce.ox.ac.uk> To Sent by: Jim Lemon <j...@bitwrit.com.au> r-help-boun...@r- cc project.org "r-help@r-project.org" <r-help@r-project.org> Subject 01/12/2010 06:21 Re: [R] Drought Severity Index AM (DSI) Hello Jim, Thanks for the response. I have the algorithm based on the original paper (Bryant et al. 1994) and subsequent modification by Philips and McGregor(1994). The latter gives the formula for calculating the index in MS Excel. I'm trying to translate it to R. Muhammad Muhammad Rahiz | Doctoral Student in Regional Climate Modeling Climate Research Laboratory, School of Geography & the Environment Oxford University Centre for the Environment South Parks Road, Oxford, OX1 3QY, United Kingdom Tel: +44 (0)1865-285194 Mobile: +44 (0)7854-625974 Email: muhammad.ra...@ouce.ox.ac.uk Jim Lemon wrote: > On 01/12/2010 07:21 PM, Muhammad Rahiz wrote: > >> Does anyone have the code to calculate the drought severity index? >> >> >> > Hi Muhammad, > If you mean "does anyone have the algorithm?" it seems pretty hard to > find. Even that old standby Wikipedia didn't have a description of > Palmer's algorithm. If you happen to have the algorithm but not the R > code, perhaps mentioning that might get some responses. > > Jim > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
