Re: [R-sig-Geo] kriging as fish swim, not as crows fly

Hi, Martin Two years ago there was a similar discussion on the list: http://markmail.org/message/tw7ulpxbgixieyys If I understand it properly, your problem is you need to compute your variogram using non-euclidian distances. As far as I know, there is no package in R that can do so (correct me if

[R-sig-Geo] curious about 4D interpolations

Dear list, I just was wondering about sofware to perform 4D interpolations. I've never tried and I'm probably not going to try it in the short time or but I was asked to give (informal) advice about it and also I was curious. I have heard GRASS gis can do that and also I've heard about EONFUSION

Re: [R-sig-Geo] Finding the county shapefile polygon closest to along-lat position

Dear Joe, Maybe you could use a similar process that Marcelino suggested to me yesterday in order to compute the shortest distance from points to a polyline. You need to 1)convert your point data to ppp object in spatstat, 2)coerce your polygon data to a psp object in spatstat. 3)nncross betwee

Re: [R-sig-Geo] shortest distance from points to polylines

Telf.: (34) 971 401561 -Mensaje original- De: r-sig-geo-boun...@stat.math.ethz.ch [mailto:r-sig-geo-boun...@stat.math.ethz.ch] En nombre de Alex Mandel Enviado el: 20 May 2009 14:33 CC: r-sig-geo@stat.math.ethz.ch Asunto: Re: [R-sig-Geo] shortest distance from points to polylines Pilar Tu

[R-sig-Geo] shortest distance from points to polylines

Hi list! I need computing shortest distance from points to a polyline layer (coast line). I've been searching all the morning a function in R that can do this but couldn't find anything! Is there any R function that do this? Or can anybody give me some hint about how it could be done? Kind rega

Re: [R-sig-Geo] variance estimation (gstat, geoR, automap)

) 971 401561 -Mensaje original- De: Virgilio Gomez Rubio [mailto:virgilio.go...@uclm.es] Enviado el: 25 February 2009 09:44 Para: Paul Hiemstra CC: Pilar Tugores Ferra; r-sig-geo@stat.math.ethz.ch Asunto: Re: [R-sig-Geo] variance estimation (gstat, geoR, automap) Hi, In addition to the

[R-sig-Geo] variance estimation (gstat, geoR, automap)

Dear all, I'm trying to estimate the variance of a global abundance estimation computed by kriging interpolation and I am stuck. One can easily retrieve the variance at each prediction location (either using the package gstat, geoR or automap) using expressions similar to: >kriging_object$kri

Re: [R-sig-Geo] kriging question

Hi Dave and everybody, I also work with acoustic data collected in parallel equidistant transects(in my case fish density)and we also have zero inflated data. "Playing" with Arcgis I saw that performing a cell declustering previous to an ordinary kriging improved substantially the predictions.

[R-sig-Geo] [Spam]: how to get numerical val ues of a variogram

Hello everybody! For sure it is very simple, but I can't find the way. How could I obtain the numerical values of a experimental semivariogram or variogram? Is it any function that makes this in geoR or gstat (or out of them)? Thanks! Pilar Mª Pilar Tugores Ferrà Becaria FPI - PhD Student

Re: [R-sig-Geo] variogram question

I would add Ordinary Least Squares (It may be the same as your SS), Weighted Least Squares, Maximum Likelihood and Restricted Maximum Likelihood. These four methods are available in the function likfit of the package geoR. I've been using it a little bit and I think sometimes one method works bet