Re: [R] ascii-grid export
On Mon, Nov 4, 2013 at 7:27 AM, Enzo Cocca enzo@gmail.com wrote: yes barry I really need this. I tried to use raster or rgdal but with poor results. I have this function: VGM_PARAM_A3 - gstat(id=bos_bison, formula=combusto~1,locations=~coord_x+coord_y, data=archezoology_table, nmax = 10) VGM_PARAM_A3 - gstat(VGM_PARAM_A3, model=vgm(1, Sph, 5, 0), fill.all=TRUE) ESV_A3 - variogram(VGM_PARAM_A3, map=True, with=0.1, cutoff=9) VARMODEL_A3 = fit.lmc(ESV_A3, VGM_PARAM_A3) plot(ESV_A3, threshold = 5, col.regions = bpy.colors(), xlab=, ylab=, main=Map - A3) png(C:\Users\User\pyarchinit_R_folder\A3 semivariogram_map.png, width=1, height=1, res=400) I make a png file but how can I convert it in ascii-grid? Why do you want to make an ascii-grid out of this? The variogram map isn't in geographical coordinates, its in coordinate differences in x and y The return value when map=TRUE doesn't seem to be too well documented, but looks like it is a list with a 'map' element that is a spatial pixels data frame. Here's an example using the demo data (I can't run your code because I don't have your data, please try and make your problems easily reproducible): require(sp) require(gstat) data(meuse) coordinates(meuse)=~x+y v=variogram(log(zinc)~1, meuse,map=TRUE,cutoff=900,width=10) class(v$map) [1] SpatialPixelsDataFrame attr(,package) [1] sp Now that can be written using rgdal's writeGDAL function. However, you need the AAIGrid driver to work properly: writeGDAL(v$map,vmap.ag,driver=AAIGrid) Error in .local(.Object, ...) : Dataset copy failed raster package to the rescue: require(raster) writeRaster(raster(v$map),v.asc,ascii) class : RasterLayer [etc] When I look at the file, I have an ESRI grid file: $ head -5 v.asc NCOLS 181 NROWS 181 XLLCORNER -905 YLLCORNER -905 CELLSIZE 10 [+ data] Now, that's assuming you wanted to write the data, not a pretty image picture like you get when you plot the variogram map. And there's still the mystery of why you want to write a non-geographic coordinate-based dataset to a geographic data format... And you should probably have asked this on R-sig-geo where the geographRs (including the authors of gstat) hang out. Hope this helps anyway. Barry __ 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.
Re: [R] ascii-grid export
yes barry I really need this. I tried to use raster or rgdal but with poor results. I have this function: VGM_PARAM_A3 - gstat(id=bos_bison, formula=combusto~1,locations=~coord_x+coord_y, data=archezoology_table, nmax = 10) VGM_PARAM_A3 - gstat(VGM_PARAM_A3, model=vgm(1, Sph, 5, 0), fill.all=TRUE) ESV_A3 - variogram(VGM_PARAM_A3, map=True, with=0.1, cutoff=9) VARMODEL_A3 = fit.lmc(ESV_A3, VGM_PARAM_A3) plot(ESV_A3, threshold = 5, col.regions = bpy.colors(), xlab=, ylab=, main=Map - A3) png(C:\Users\User\pyarchinit_R_folder\A3 semivariogram_map.png, width=1, height=1, res=400) I make a png file but how can I convert it in ascii-grid? thanks enzo 2013/11/3 Barry Rowlingson b.rowling...@lancaster.ac.uk Or do you mean you want to write the gridded output of an interpolation you did (perhaps using kriging) in gstat as an ESRI ASCII Grid file for reading into a GIS? If so, you can probably do it with writeGDAL from the rgdal package, or writeRaster from the raster package. I don't really know what a 'semivariogram map' is. On Sat, Nov 2, 2013 at 8:55 AM, Enzo Cocca enzo@gmail.com wrote: hi, I want to export in ascii-grid file a semivariogram map that I have did with gstat library. How can I make it? Somebody can help me? thanks! enzo -- Enzo Cocca (PhD Candidate) Research Fellow Università di Napoli L'Orientale mail: enzo@gmail.com cell: +393495087014 [[alternative HTML version deleted]] -- Enzo Cocca (PhD Candidate) Research Fellow Università di Napoli L'Orientale mail: enzo@gmail.com cell: +393495087014 [[alternative HTML version deleted]] __ 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] ascii-grid export
hi, I want to export in ascii-grid file a semivariogram map that I have did with gstat library. How can I make it? Somebody can help me? thanks! enzo -- Enzo Cocca (PhD Candidate) Research Fellow Università di Napoli L'Orientale mail: enzo@gmail.com cell: +393495087014 [[alternative HTML version deleted]] __ 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.
Re: [R] ascii-grid export
If I understand what you are up to, my pander package might help. You mean something like this? I used the example form the package manual. library(pander) data(meuse) coordinates(meuse) = ~x+y pander(variogram(log(zinc)~1, meuse)) np dist gamma dir.hor dir.ver id -- --- - - 57 79.29 0.1234 0 0 var1 299 164 0.2162 0 0 var1 419 267.4 0.3028 0 0 var1 457 372.7 0.4121 0 0 var1 547 478.5 0.4634 0 0 var1 533 585.3 0.5647 0 0 var1 574 693.1 0.569 0 0 var1 564 796.2 0.6187 0 0 var1 589 903.1 0.6471 0 0 var1 543 1011 0.6916 0 0 var1 500 1118 0.7034 0 0 var1 477 1221 0.6039 0 0 var1 452 1329 0.6517 0 0 var1 457 1437 0.5665 0 0 var1 415 1543 0.5748 0 0 var1 Best, Gergely On 2 November 2013 09:55, Enzo Cocca enzo@gmail.com wrote: hi, I want to export in ascii-grid file a semivariogram map that I have did with gstat library. How can I make it? Somebody can help me? thanks! enzo -- Enzo Cocca (PhD Candidate) Research Fellow Università di Napoli L'Orientale mail: enzo@gmail.com cell: +393495087014 [[alternative HTML version deleted]] __ 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. [[alternative HTML version deleted]] __ 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.
Re: [R] ascii-grid export
Or do you mean you want to write the gridded output of an interpolation you did (perhaps using kriging) in gstat as an ESRI ASCII Grid file for reading into a GIS? If so, you can probably do it with writeGDAL from the rgdal package, or writeRaster from the raster package. I don't really know what a 'semivariogram map' is. On Sat, Nov 2, 2013 at 8:55 AM, Enzo Cocca enzo@gmail.com wrote: hi, I want to export in ascii-grid file a semivariogram map that I have did with gstat library. How can I make it? Somebody can help me? thanks! enzo -- Enzo Cocca (PhD Candidate) Research Fellow Università di Napoli L'Orientale mail: enzo@gmail.com cell: +393495087014 [[alternative HTML version deleted]] __ 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.
