similar to: Calculating volume under polygons

bonjour en travaillant avec un logiciel Multiple source methode, j'ai eu ce message d'erreur : simpleError in storage.mode(y) - "double": invalid to change the storage mode of a factor en recherchant sur le net , c'est un message universel svp, que signifiera ce message ? merci pour votre int?r?t anzid -- View this message in context:

Hi everyone, I am facing a problem I really do not know how to resolve about detecting significant spatial structures in a region I am studying. The study is about the Miombo forest (wooded savanna). I am working in a 10 ha permanent forest plot, where all trees are mapped and identified. I sampled 24 more or less regulately scattered plots of 25 x 25 m over the 10 ha. In each plot of 25 x 25 m

Imagine that I have a large number of points (given by coordinates x and y) that vary in density per space. For the purpose of demonstration it could be generated like this: s <- data.frame(x=runif(10000,0,900),y=runif(10000,0,900)); plot(s) I want to create polygons around the points where point density is greater than a selected threshold (for example, by using krieging or equivalent

Full_Name: Tom Short Version: 2.1.0 OS: Win2000 Submission from: (NULL) (68.236.159.160) print.condition prints out error messages enclosed in angle brackets as in: > simpleError("Sigh, yet another error...") <simpleError: Sigh, yet another error...> If R is used to generate HTML output (R2HTML or Rpad), then the error messages get hidden because browsers will skip right

Hi, at the R prompt, is it possible to retrieve the last error (as in condition object of class "error")? I'm not asking for geterrmessage(), which only returns the error message (as a character string). I'm basically looking for a .Last.error or .Last.condition, analogously to .Last.value for values, which can be used when it is "too late" (not possible) to go back

Hello, I need to calculate the centroids of some spatial polygons that I have placed into a Polygons-class object. Is the labeling point in the Polygons-class the centroid of the polygon? Thank you for your help.

The following example involves a function whose on.exit() expression both generates an error and catches the error. The body of the function also generates an error. When calling the function wrapped in a tryCatch, should that tryCatch's error function be given the error from the body of the function, since the one from the on.exit has already been dealt with? Currently the outer tryCatch

I am using wireframe from the lattice package, with the shade option set to TRUE. When I output to PDF or Postscript, a line gets drawn around each polygon of my surface which causes ugly Moir? effects and doesn't make sense in my application (think the plot of Maunga Whau--gridlines don't make sense). This does not happen when I display on the screen-- then I just get the surface as

Dear R users, I would like to know how to indentify the polygons that are located on the border of a map (i.e.shapefile). Do you have any suggestion on how to do it? Thank you very much, Leo Monasterio. [[alternative HTML version deleted]]

I have a SpatialPolygonsDataFrame object (sp package). It contains 40 polygons. Now I want to join some of the polygones. I cannot figure out how to do that? Any ideas? The code below produces a map of Germany and I need to join some counties. library(sp) library(RColorBrewer) # get spatial data for Germany on county level con <- url("http://gadm.org/data/rda/DEU_adm3.RData")

Hi. For a spatial analysis (its visualization) I need to produce a map of conditions and traits. When I used SpatialPixelsDataFrame (sp package) my grid cells were regular and between each row was a small gap, which is not only messy but incorrect. So I generated the coords of each grid from the centroids in order to elongate the cells manually (or does anybody know another way to solve this?).

i saw many people can't get Kotor running well its not Kotor its your drivers...

Hello. I'd like to convert voronois object created by tripack to polygons to use them in GIS(Geographic Information Systems) software. I tried to create voronoi objects by using following code. > library(tripack) > x <- rnorm(10) > y <- rnorm(10) > plot(x,y) > v<-voronoi.mosaic(x,y) > plot(v) But from here, I could not create polygons. Of course, I know

Dear all, How to generate one outline polygon for each point clump? Are there any present functions in ArcView, ArcGIS, R or some freewares? I just had a quick look at the package adehabitat and did not find the function. To my knowledge, I could do it as follows: 1) make a grid map of my study area with cell values = 0; 2) assign 1 to the cells containing at least one point; 3) convert the

I'm sure this has been asked before quite a few years ago and in great quantity, but I've been searching threads on various sites for a few hours now, and can't seem to find a fix. Anywho, I have KOTOR installed, and it runs in fullscreen and all that, however, all my polygons are white, as in, there is no textures. All the text within the game is also just blue boxes. This obviously

Hi This is for developers of extension packages that provide extra *graphics devices* for R. In the *development* version of R, support has been added to the graphics engine for rendering polygons with holes (e.g., maps with lakes with islands ...). The API change is a new dev_Path() function for graphics devices. The R_GE_version constant (in GraphicsEngine.h) has been bumped up to 8 as a

I'm looking for a way to plot lines on top of a levelplot(), where the lines are borders between cells of different values. The clines() function provides contours suitable for continuous data. I am dealing with discrete values, spatial clusters of nodes where each cluster has an integer value, and I want to plot the borderlines between these areas. So, in a levelplot having nodes with

I have a barplot I have created using barplot2 and I have been able to add points and lines (using the points and lines methods, respectively). I now need to add some polygons (triangles in particular), that I want to be shaded to match bars in the plot. I can get the coordinates of the corners of the triangles, but don't know how to draw the triangles. I know there is the grid.polygon

Hello, Below a modified function for displaying a correlation matrix by Vincent Zoonekynd posted in his excellent tutorial. Compared to the matrix and the legend, the colouring of the polygons is wrong. The error is in the sequence: col=col[N*(mat[i,j]+1)/2]. I cannot seem to devise a sequence which will make the colouring consistent with that in the legend. Can you help? The number of different

Dear list, I have a question regarding the included polygon in the khat function of the splancs library defining the area where points appear. I have not only one simple polygon included, my map includes several islands. I read my map which was a shape file by readShapeSpatial of the maptools library. Then I split up the SpatialPolygonsDataFrame into the included polygons by coor <- NULL