[R-sig-Geo] writing shapefiles / DBF files when input data contains NA

2008-10-06 Thread Dylan Beaudette
Hi, I have noticed that saving data to files that include a DBF, result in bogus data where there were NA. Using the write.dbf() function from the foreign package seems to work a little better, but I still get odd results in numeric columns. Writing to GRASS with the methods in the spgrass6 packag

Re: [R-sig-Geo] Can't import precise GPS data

2008-10-06 Thread Dylan Beaudette
On Monday 06 October 2008, Andrew Rayburn wrote: > My problem is that I can't import precise (to 3 decimal places) Northing > and Easting coordinates into R. The data were taken on a ProMark3 GPS > unit, with the intent of obtaining extremely precise GPS coordinates. > Post-processing was done cor

Re: [R-sig-Geo] Can't import precise GPS data

2008-10-06 Thread Barry Rowlingson
2008/10/6 Andrew Rayburn <[EMAIL PROTECTED]>: > My problem is that I can't import precise (to 3 decimal places) Northing and > Easting coordinates into R. The data were taken on a ProMark3 GPS unit, > with the intent of obtaining extremely precise GPS coordinates. > Post-processing was done correc

[R-sig-Geo] Can't import precise GPS data

2008-10-06 Thread Andrew Rayburn
My problem is that I can't import precise (to 3 decimal places) Northing and Easting coordinates into R. The data were taken on a ProMark3 GPS unit, with the intent of obtaining extremely precise GPS coordinates. Post-processing was done correctly, and the resulting Northings and Eastings were to

Re: [R-sig-Geo] [Gstat-info] LOCAL universal kriging with GLOBAL reg. coeff.estimation

2008-10-06 Thread Edzer Pebesma
Dave Depew wrote: A late follow up question to this thread What if the local neighbor hood was restricted to the range of autocorrelation? My impression was that values beyond that have little weight in the interpolation anyways. Often, yes. Three exceptions are (i) when the nugget forms

Re: [R-sig-Geo] [Gstat-info] LOCAL universal kriging with GLOBAL reg. coeff.estimation

2008-10-06 Thread Dave Depew
A late follow up question to this thread What if the local neighbor hood was restricted to the range of autocorrelation? My impression was that values beyond that have little weight in the interpolation anyways. I realize that this is of course not statistically optimal, but for those with

Re: [R-sig-Geo] Modifying a column in a Shapefile

2008-10-06 Thread Juliane Struve
Dear Roger, thank you very much for your help, (and thank you to others who have helped me to set this up) . The code below seems to convert the data in column NEAR_ANGLE correctly and also writes a new shapefile,although I may have made mistakes that I am not yet aware of. MergedCentroids

Re: [R-sig-Geo] GRASS and R

2008-10-06 Thread Jorge de Jesus
Hi Aside from the books and link suggestions, the safest way to start dealing with open source GIS is to run everything is a VMWare virtual machine. In this site you can download a virtual machine image with Ubuntu as OS and with all the OpenSource software installed and running (GRASS/Qgis/R/FW