My sincere thanks to Li for his simplified answer to my queries.
With best Regards Rajendra M Panda SWR, IIT Kharagpur On Wed, Aug 20, 2014 at 5:50 AM, Li Wen <[email protected]> wrote: > HI, Raj > > 1100 points is not huge. Anyway, there are a number of ways to extract > values from raster layers. > 1. Suppose you sample points are an excel datasheet of X (longitude) and Y > (latitude). Saving it as .csv file, then read it into R as spatial data: > Samples<-SpatialPoints(read.csv("yourfilename.csv")) > Extracteddataset<- extract(yourrasterstack, Samples) > 2. If you have a shape file (from ArcGIS) of the sample points: > require(rgdal) > Samples<- readOGR(".", layer="yourshapefilename") ## without > ".shp" and the shp file in your working folder > > HTH > Li > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Rajendra Mohan panda > Sent: Wednesday, 20 August 2014 2:19 AM > To: [email protected] > Subject: Re: [R-sig-eco] Query related to maxent file in dismo package > > Thanks a lot Jon > > I have more than 1100 sample points. I want to extract values for 19 > variables in Bioclim data for maxent model. > I do not understand if the following code automatically loads bioclim > variables grd file or not? > > logo <- stack(system.file("external/rlogo.grd", package="raster")) > > If I have to go for my downloaded grd files then how shall I do? path to > defined (system or any drive etc) > > I also face problem to define the point matrix for huge datasets as given > in example in dismo package. Is there any easy way out? > > #presence data > pts <- matrix(c(48.243420, 48.243420, 47.985820, 52.880230, 49.531423, > 46.182616, 54.168232, 69.839163, 73.233228, 63.239594, 45.892154, > 43.252326, 28.356155) , ncol=2) > > I also request you all to know the way I can use ArcGIS extracted > grd/ascii file for my sample points to run maxent in R? > > I hope it may help me huge datasets I have. Not sure. > > Your kind advise is highly appreciated. > > > > With best Regards > Rajendra M Panda > SWR, IIT Kharagpur > > > On Tue, Aug 19, 2014 at 5:25 PM, Jon Skoien <[email protected]> > wrote: > > > It depends what you mean by using Climond data for extracting values, > > I do not know the data set particularly well. > > But I assume you can use Climond data if you download a format which > > can be opened by raster. If you want a more specific answer, you need > > to describe more specific what you want to do. It is generally a good > > advice to follow the mail-recommendations from the r-help list: > > > > PLEASE do read the posting guidehttp://www.R-project.org/ > > posting-guide.html and provide commented, minimal, self-contained, > > reproducible code. > > > > Best wishes, > > Jon > > > > > > On 8/19/2014 11:09 AM, Rajendra Mohan panda wrote: > > > >> Thank you Won and Jon > >> > >> I am now able to put my maxent jar file in appropriate folder. > >> However I have little more confusion on extraction of environmental > >> variables to R. > >> Can we use Climond data for extract values for use in maxent model in R? > >> > >> > >> With best Regards > >> Rajendra M Panda > >> SWR, IIT Kharagpur > >> > >> > >> On Tue, Aug 19, 2014 at 12:33 PM, Jon Skoien > >> <[email protected] > >> > > >> wrote: > >> > >> Did you download the maxent.jar file from > >>> http://www.cs.princeton.edu/~schapire/maxent/ > >>> and put it in the folder with the name returned by: > >>> > >>>> system.file("java", package="dismo") > >>>> > >>> as described in the man-page of maxent? > >>> > >>> If you have already tried this, you have to describe your problem > >>> better for anyone to be able to help. > >>> > >>> Best wishes, > >>> Jon > >>> > >>> > >>> > >>> On 8/18/2014 6:42 AM, Rajendra Mohan panda wrote: > >>> > >>> Dear All > >>> What is the procedure to fix maxent jar file in "dismo" java file? I > >>> am doing it after extracting "dismo" zip file.However, the file is > >>> not executing. I think some silly mistake is there on my part. I > >>> would highly appreciate if anyone of advise in this regard. > >>> > >>> With best Regards > >>> Rajendra M Panda > >>> SWR, Indian Institute of Technology Kharagpur > >>> > >>> [[alternative HTML version deleted]] > >>> > >>> _______________________________________________ > >>> R-sig-ecology mailing [email protected]:// > >>> stat.ethz.ch/mailman/listinfo/r-sig-ecology > >>> > >>> > >>> > >>> [[alternative HTML version deleted]] > >> > >> _______________________________________________ > >> R-sig-ecology mailing list > >> [email protected] > >> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > >> > > > > > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-ecology mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-sig-ecology > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- > This email is intended for the addressee(s) named and may contain > confidential and/or privileged information. > If you are not the intended recipient, please notify the sender and then > delete it immediately. > Any views expressed in this email are those of the individual sender > except where the sender expressly and with authority states them to be the > views of the NSW Office of Environment and Heritage. > > PLEASE CONSIDER THE ENVIRONMENT BEFORE PRINTING THIS EMAIL > > [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
