Hi, You may want to redirect your question to the R-sig-Geo mailing list:
https://stat.ethz.ch/mailman/listinfo/r-sig-geo In the meantime, you might consider writing to the 'rasterfile' format. The 'rasterfile' format is very well documented and is to read/write from R; I suspect it would easy for you to write to this format from Fortran. See the details here: http://cran.r-project.org/web/packages/raster/vignettes/rasterfile.pdf Cheers, Ben On Apr 27, 2015, at 11:55 AM, Antonio Serrano via R-help <r-help@r-project.org> wrote: > > > Ok. > > > The point now is that I have the sources (in Fortran) of the program that > produces the graph with the map. And have to attach the information about the > xrange and yrange to this graph in order for them to be read from R. Id est, > I have to write: first longitude, first latitude, last longitude, last > latitude, and also, the "figure" coordinates of the bounding box of the map > in the figure. > > If I produce the map in eps, I can open it as a text file from the same > fortran rogram, and modify the contents of the eps file in order to put the > coordinates information into it. > > Then, once the fortran program has ended, I convert the eps to png using > ImageMagic, because the EBImage library doesn't read eps, but png. > > In order for the png to contain the same properties as the eps, these have to > be correctly defined in the eps. > > So, the question now is: how can I properly define properties in a eps, so > that these are preserved in the convertion to png?. > > Perhaps this is not for this forum, but I haven't found information about it > in the internet. > > > > > > Antonio Serrano > aasde...@aim.com > ن > > > > > > > > > -----Original Message----- > From: Jim Lemon <drjimle...@gmail.com> > To: Antonio Serrano <aasde...@aim.com> > Sent: Sun, Apr 26, 2015 1:03 am > Subject: Re: [R] Interactive maps > > > > Hi Antonio, > If you mean the normalized figure coordinates (i.e. from 0 to 1) > then > you want something like > this: > > loc_convert<-function(n=1,xrange=c(0,1),yrange=c(0,1)) { > > plot_loc<-locator(n=n) > plot_loc$x<-plot_loc$x/diff(xrange)+xrange[1] > > plot_loc$y<-plot_loc$y/diff(yrange)+yrange[1] > return(plot$loc) > } > > where > xrange and yrange are the longitudes and latitudes respectively. > > Jim > > > On > Sun, Apr 26, 2015 at 1:09 AM, Antonio Serrano <aasde...@aim.com> wrote: >> Thank > you, Jim: >> >> I have tried your suggestion and I get the following > error: >> >> Error en rasterImage(image = "map.eps", : >> invalid color > name 'map.eps' >> >> I have tried with three formats of the same image: svg, > gif and eps, with >> the same result. >> >> But I have found a possible better > way to accomplish this objective in the >> following thread: >> > http://r.789695.n4.nabble.com/Loading-an-image-picture-png-jpeg-to-screen-td2244923.html >> >> > In short: >> >> library(gridExtra) >> library(EBImage) >> library(RGraphics) >> > x <- readImage("http://www.google.com/logos/teachersday09.gif";) >> g1 <- > ebimageGrob(x) >> dev.new(width=g1$width/72, height=g1$height/72) >> > plot.new() >> grid.draw(g1) >> c=locator(n=1, type="n") >> >> Then, when I click > on the map, I get the "figure" coordinates where I >> clicked, and still have to > translate these to longitude-latitude. >> >> And here comes another question: > How can I attach the first longitude, last >> longitude, fisrt latitude, last > latitude, to a JPEG, PNG or TIFF graphic?. >> These are the formats supported by > the EBImage package. >> >> >> >> Antonio Serrano >> aasde...@aim.com >> > ن >> >> >> -----Original Message----- >> From: Jim Lemon > <drjimle...@gmail.com> >> To: Antonio Serrano <aasde...@aim.com> >> Sent: Sat, > Apr 25, 2015 8:36 am >> Subject: Re: [R] Interactive maps >> >> Hi Antonio, >> > Try the rasterImage function. >> >> Jim >> >> >> On Sat, Apr 25, 2015 at >> 4:19 > PM, Antonio Serrano <aasde...@aim.com> wrote: >>> Thank you, Jim. >>> >>> I >> > didn't know the existence of the locator() function. But I can see now >>> that > I >> don't know how to read a graphic image into R to work with it. >>> How can > I read >> a pre-exisiting image into R?. >>> >>> Thanks again >>> >>> >>> > Antonio Serrano >>> >> aasde...@aim.com >>> ن >>> >>> >>> -----Original > Message----- >>> From: Jim Lemon >> <drjimle...@gmail.com> >>> To: Antonio > Serrano <aasde...@aim.com> >>> Cc: r-help >> mailing list > <r-help@r-project.org> >>> Sent: Sat, Apr 25, 2015 5:47 am >>> >> Subject: Re: > [R] Interactive maps >>> >>> Hi Antonio, >>> If you do create the map >> in R, > you can use >>> locator(). >>> >>> Jim >>> >>> >>> On Sat, Apr 25, 2015 at > 8:37 >> AM, Antonio Serrano via >>> R-help >>> <r-help@r-project.org> > wrote: >>>> >>>> >> Hello, all: >>>> >>>> I am new here, >>> and have a > challenge to present some >> graphical data to the user in a >>> convenient >>> > way. >>>> >>>> The challenge >> is to present a map to the user which is > coloured >>> with the value of a >> variable. Say for example, temperature. This > is a >>> preexisting graph that I >> can generate in any format, including svg. > I don't >>> have >>> to produce it >> using R. >>>> >>>> When the user clicks > anywhere in the map, the >>> coordinates >> (longitude and latitude) have to be > passed to R so that this, R, >>> can >>> look >> for the values of other > variables in that location and make another >>> graph >>> >> with > them. >>>> >>>> Does anyubody know how could I accomplish >> > this?. >>>> >>>> >>> Thanks in advance. >>>> >>>> >>>> >>>> Antonio > Serrano >>>> >> aasde...@aim.com >>>> ن >>>> >>>> >>>> >>> [[alternative HTML > version >> deleted]] >>>> >>>> >>> > ______________________________________________ >>>> >> R-help@r-project.org > mailing >>> list -- To UNSUBSCRIBE and more, see >>>> >>> >> > 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 -- To UNSUBSCRIBE and more, see > 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. Ben Tupper Bigelow Laboratory for Ocean Sciences 60 Bigelow Drive, P.O. Box 380 East Boothbay, Maine 04544 http://www.bigelow.org ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
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