Hi Jenny, Maybe the following links will be useful for you. Both of thoes are used in meteorological and climate research community. But u can used the codes to create the data values that you need.
g2fsh : Interpolates a scalar quantity from a Gaussian grid to a fixed grid. http://www.ncl.ucar.edu/Document/Functions/Built-in/g2fsh.shtml g2fshv : Interpolates a vector quantity from a Gaussian grid to a fixed grid. http://www.ncl.ucar.edu/Document/Functions/Built-in/g2fshv.shtml In addition, both of those functions based on a package named SPHEREPACK (http://www.cisl.ucar.edu/css/software/spherepack/ ). you can write call subroutines shipped from SPHEREPACK to get values at your fixed grids. Good luck. Zhuanshi He On 12/12/06, Jenny Barnes <[EMAIL PROTECTED]> wrote: > > Dear R-help community, > > I have looked on the R search site and archives but cannot find mention of a > way > of interpolating a gaussian distribution of data to a standard 2.5 degree > grid. > > I have two global dataset and I need to correlate - unfortunately one is a 2.5 > degree grid dim[longitude=144,latitude=72] and one is gaussian > dim[longitude=192,latitude=94]. > > I would rally appreciate hearing back from any of you who may have wanted to > interpolate your data is this way. If there is no ready-made function you know > of but you are willing to share your own methods I would also appreciate any > pointers. > > Many thanks for your time, > > Jenny Barnes > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Jennifer Barnes > PhD student - long range drought prediction > Climate Extremes > Department of Space and Climate Physics > University College London > Holmbury St Mary, Dorking > Surrey > RH5 6NT > Web: http://climate.mssl.ucl.ac.uk > > ______________________________________________ > [email protected] 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. > > > -- Zhuanshi He / Z. He (PhD) Waterloo Centre for Atmospheric Sciences (WCAS) Department of Chemistry Phy Bldg, Rm 2022 University of Waterloo, Waterloo, ON N2L 3G1 Canada Tel: +1-519-888-4567 ext 38053 FAX: +1-519-746-0435 ______________________________________________ [email protected] 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.
