r-sig-geo@r-project.org discussions

0	[R-sig-Geo] plotKML - html.table description block

Hi I would like to use the plotKML package to create a KML file for google earth. Specifically, I intend to display several attributes of a spatial points dataframe. How do I define the argument ...

Twah
Jun 17, 2016 at 8:05 pm
Jun 17, 2016 at 8:05 pm

1	[R-sig-Geo] Problems with gbif function in package dismo

Hello r-sig-geo, The gbif function in package dismo does not appear to be functioning. No matter what genus/species combination I try, the function finds 0 records. For example: sp.occur <- ...

Tim Bean
Jun 15, 2016 at 8:41 pm
Jun 16, 2016 at 5:45 pm

2	[R-sig-Geo] Using GStat for kriging with Anisotropy

Hello, I am trying to use kriging to make temperature predictions but I have run into a slight issue. I would like to include anisotropy in my variogram model but GStat does not support anisotropy ...

Dan Turenne
Jun 15, 2016 at 6:00 pm
Jun 16, 2016 at 12:53 pm

0	[R-sig-Geo] Kernel Density Estimator Help

Hi, I?m running across an issue with my code while trying to use a Kernel Density Estimator to cluster points. I am working with my data in two different ways trying to find the most optimal. First, ...

Alex Fitz
Jun 13, 2016 at 4:05 pm
Jun 13, 2016 at 4:05 pm

0	[R-sig-Geo] Ncdf with missing variable columns

Hi all, I'm trying to get some variables iteratively from a directory with a large number of .nc files and create a csv.file. I wrote this script: filenames <- list.files("directory", pattern="*.nc", ...

Matteo lattuada
Jun 13, 2016 at 8:14 am
Jun 13, 2016 at 8:14 am

0	[R-sig-Geo] mapview-1.1.0 now on CRAN

Dear all, we are happy to announce that mapview-1.1.0 is now available on CRAN. This release marks a major update of the package. Here's the NEWS file: new features: * addMouseCoordinates: add cursor ...

Tim Appelhans
Jun 12, 2016 at 3:22 pm
Jun 12, 2016 at 3:22 pm

1	[R-sig-Geo] Incorrect area coming from raster

Hi All, Currently I am using a raster of the gridded world population (GWPv4) to calculate density in Nigeria. I also have the Nigeria shapefiles from GADM. I am having an issue with the area?s that ...

Alex Fitz
Jun 9, 2016 at 8:16 pm
Jun 10, 2016 at 1:15 am

0	[R-sig-Geo] multivariate sequential gaussian cosimulation using gstat

so I have a few questions. I am looking to simulate a set of 3 (out of 4) correlated stochastic fields, which are all related through a linear model of coregionalization. One of the fields will be ...

William Savran
Jun 9, 2016 at 8:01 pm
Jun 9, 2016 at 8:01 pm

0	[R-sig-Geo] Difference in size between extract and crop functions

Hi, I am currently trying to match my area data for each cell in a raster to the population of each cell to calculate the density. When I run the crop function to get the specific state data that I ...

Alex Fitz
Jun 9, 2016 at 1:31 pm
Jun 9, 2016 at 1:31 pm

1	[R-sig-Geo] Determining the area of grid cells from a raster in R

Hi, I have a raster and I am trying to get the area of each grid cell. The raster object is a country and I am trying to get the area of my grid cells so I can calculate density. When I type in the ...

Alex Fitz
Jun 8, 2016 at 7:49 pm
Jun 8, 2016 at 9:00 pm

3	[R-sig-Geo] Create circular polygon of certain radius in R

Hi, I have a raster, which is projected into "+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0". Now I would like to create a circular Polygon with a radius of 300 meters around a cell ...

Giacomo May
Jun 8, 2016 at 11:26 am
Jun 8, 2016 at 6:47 pm

2	[R-sig-Geo] multivariate sequential gaussian cosimulation using gstat in R

Dear All, I am new to gstat and fairly new to applying geostatistical methods, so I have a few questions. I am looking to simulate a set of 3 (out of 4) correlated stochastic fields, which are all ...

William Savran
Jun 6, 2016 at 4:56 pm
Jun 6, 2016 at 5:26 pm

2	[R-sig-Geo] dissolve tiny polygons to others with unionSpatialPolygons{maptools}

Indeed, threshold is not passed through, it was used when the function used gpclib rather than rgeos; I'm minded to deprecate maptools::unionSpatialPolygons anyway. Note that the data are in ...

Roger Bivand
Jun 6, 2016 at 1:24 pm
Jun 6, 2016 at 7:19 pm

1	[R-sig-Geo] warning in errorsarlm

Hi, I am trying to fit a simultaneous autoregressive model to some data using the spdep package. In order to identify the appropriate spatial distance to use, I use the correlog function to find the ...

Pascal Title
Jun 5, 2016 at 9:58 pm
Jun 6, 2016 at 9:45 am

4	[R-sig-Geo] Question impacts lagged independent variables lagsarlm

Dear all, I am working with a lagsarlm "mixed" model I executed: library(spdep) library(coda) dsts15 <- nbdists(nbs15, data.xy) idw15 <- lapply(dsts15, function(x) 1/(x)) sy15 <- nb2listw(nbs15, ...

Jorge Cárcamo
Jun 4, 2016 at 2:58 pm
Jun 5, 2016 at 3:33 pm

10	[R-sig-Geo] How to calculate climatology in rasterbricks

Dear all, I am working with daily time series of meteorological variables. This is an example of the dataset: library(raster) # Create date sequence idx <- seq(as.Date("1961/1/1"), ...

Thiago V. dos Santos
Jun 2, 2016 at 8:30 pm
Jun 8, 2016 at 7:44 pm

8	[R-sig-Geo] gDistance transition objects: dealing with NAs in source cost raster

Dear all, I?m using two functions (copied below, based on Jacob van Etten?s own documentation for distance) in order to construct the required transition objects for use in gDistance functions such ...

T C Wilkinson
Jun 2, 2016 at 10:22 am
Jun 2, 2016 at 5:23 pm

1	[R-sig-Geo] Convert ncdf data to dataframe

Dear all, I have used the following code to read in a ncdf file library(chron) library(lattice) library(ncdf4) library(data.table) ncname <- ("/file_path") ncfname <- paste(ncname, ".nc", sep = "") ...

Miluji Sb
Jun 2, 2016 at 8:42 am
Jun 2, 2016 at 1:20 pm

6	[R-sig-Geo] Building a prediction raster when the statistical model was built from sampling units of different sizes

Hello, I would like to build a predictive map of capture success from a GAM. To build the GAM, I used data of capture success (dependent variable in the model) and proportions of land cover types ...

Nelly Reduan
May 27, 2016 at 5:05 pm
Jun 10, 2016 at 12:05 am

2	[R-sig-Geo] R on Mac building up memory usage

Hi, I guess this may be not a specificity of r-sig-geo but as I am using library(rgdal) library(rgeos) in this script so it may be the reason? (perhaps I should try running something else to check) ...

Dr Didier G. Leibovici
May 27, 2016 at 11:51 am
May 27, 2016 at 8:06 pm

2	[R-sig-Geo] Match Coordinates to NUTS 2 ID

Dear all, I have downloaded the NUTS 2 level data from library(?rgdal?) library(?RColorBrewer?) library(?classInt?) #library(?SmarterPoland?) library(fields) # Download Administrative Level data from ...

Miluji Sb
May 26, 2016 at 9:31 pm
May 27, 2016 at 8:42 am

5	[R-sig-Geo] Overlay between polygons and their intersecting lines

Dear all, I can't find a solution for the following problem: When I first intersect a line with 2 polygons (splitting it into 2 segments) and then use an overlay to get for each segment the attribute ...

Gwennaël Bataille
May 25, 2016 at 1:53 pm
May 30, 2016 at 2:01 pm

1	[R-sig-Geo] Raster: Can't read raster-created NCDF back in

Hi, I have a rasterBrick object that I have created through a series of manipulations and written to disk using writeRaster(x,format="CDF"). In another, independent script, I then need to read that ...

Mark R Payne
May 25, 2016 at 9:58 am
May 25, 2016 at 10:15 am

4	[R-sig-Geo] Bearing angle of UTM projected SpatialLines

Dear everyone, I'm used to calculating the compass angles (clockwise from due North) of line features projected in UTM using the tool Linear Directional Mean ...

Eduardo Diez
May 25, 2016 at 3:15 am
May 26, 2016 at 10:28 am

5	[R-sig-Geo] Calculate each polygon percentage inside a circles

Dear members, I will try to calculate each polygon percentage inside a circles given an arbitrary radius in a shapefile object with the code below and my output needs to be (Two first columns with ...

ASANTOS
May 25, 2016 at 1:17 am
May 27, 2016 at 12:09 am

0	[R-sig-Geo] TSA error using packet 1 any (sp) is not TRUE

Hello Guys, I am trying to do Trend Surface Analysis (TSA) via OLS as rainfall function of longitude and latitude. This TSA needs spatialgriddataframe which is grd. The code went fine, but the graph ...

Yasmine mohamed
May 23, 2016 at 1:23 pm
May 23, 2016 at 1:23 pm

2	[R-sig-Geo] Run focal function on a multi-layer raster

I have a multi-layer raster, in this case a rasterbrick, on which I would like to apply a focal function on each layer, and get another rasterbrick as a result. I am trying to use calc, but ...

Thiago V. dos Santos
May 21, 2016 at 8:02 pm
May 21, 2016 at 10:24 pm

1	[R-sig-Geo] spatial data with binomial distribution

Hello,I'm trying to simulate a grid with binomial distribution spacially dependent. For the normal distribution, the package geoR has the command grf(). Has anyone some ideia how can I do this?Thanks ...

Daniela Nava
May 20, 2016 at 12:53 pm
May 20, 2016 at 1:04 pm

0	[R-sig-Geo] Drawing spokes from a fixed point to the boundary of a polygon and take the maximum cut point

Hello everyone, I am working with spatial polygon and using SP and RGEOS package. I am having problem to find the maximum-distance intersect points with spokes (drawn from a kind of centroid) and the ...

Kaushik Jana
May 20, 2016 at 7:21 am
May 20, 2016 at 7:21 am

1	[R-sig-Geo] extracting centroids from map data

Hello all, I'm working on a map. I'd like to extract centroids of the counties below in order to plot them as points. How can I do this? Many thanks, Andy ~~~~ library(ggplot2) library(maps) ...

Andy Bunn
May 20, 2016 at 3:41 am
May 20, 2016 at 4:48 am

6	[R-sig-Geo] For each point, distance to nearest point in second dataset

Hi All, Trying to an equivalent to the "nearest" tool in ArcGIS for two SpatialPointDataFrames. I can do the naive implementation by calculating all pairwise distances using gDistance and taking the ...

Nick Eubank
May 19, 2016 at 8:41 pm
May 20, 2016 at 1:37 am

3	[R-sig-Geo] gBuffer solution to invalid objects problem fails

Hi all, I have been getting the below error a few times. I have seen in several places that a zero-width gBuffer call will fix the topology problem. However, in this case, I find that the call to ...

Kenny Bell
May 18, 2016 at 5:08 pm
May 19, 2016 at 7:55 pm

1	[R-sig-Geo] Creating a grid

Hello everybody, I am trying to build a grid from a polygon, using the functions spsample and gridded, but it seems there is something wrong with the coordinates in longitude and latitude which not ...

Andres Diaz
May 18, 2016 at 4:22 pm
May 18, 2016 at 4:43 pm

0	[R-sig-Geo] Cran R Bagidis (semi-metric) and functional curve data

Hi, Has anyone applied the CRAN R Bagidis package to animal movement data or other functional curve data (EEG, Ecog, bird flight, econometrics)? This semi-distance allows for comparing curves with ...

Chris english
May 18, 2016 at 11:56 am
May 18, 2016 at 11:56 am

2	[R-sig-Geo] Address from Wikimapia

Is it possible to convert latitude and longitude into addresses in R using Wikimapia mapping instead of Google? The reason being that Wikimapia addresses have more details. This is the code I have ...

Miluji Sb
May 17, 2016 at 10:25 pm
May 18, 2016 at 2:18 am

2	[R-sig-Geo] R 3.3.0 - spatstat 1.45-2 - envelope -- Error in nrank%%1 : non-numeric argument to binary operator

Dear all, I get "Error in nrank%%1 : non-numeric argument to binary operator" running Envelope works fine running Thanks, -- Domenico Giusti <dncgst at gnewarchaeology.it GPG keyID ...

Domenico Giusti
May 17, 2016 at 11:44 am
May 18, 2016 at 9:00 am

0	[R-sig-Geo] K-select tolerance

Dear list members, I am performing a K-select analysis (/kselect/ function in adehabitatHS), I have been able to compute the marginality for each animal, but does anyone know how to compute the ...

Jeremy Larroque
May 17, 2016 at 9:43 am
May 17, 2016 at 9:43 am

3	[R-sig-Geo] getting mean values for each raster in a stack

Dear R users I have a raster stack and a polygon. I want the mean value inside this polygon for each raster in the stack. I'm doing the following: vals <- extract(stack,polygon) colMeans(r.vals[[1]]) ...

Antonio Silva
May 16, 2016 at 6:32 pm
May 16, 2016 at 9:14 pm

2	[R-sig-Geo] spsample bug?

Hi I encountred a problme when running a loop to generate randomly distributed points within a polygon. The error I get is: Error in .local(x, n, type, ...) : iteration did not converge; try ...

Juta Kawalerowicz
May 11, 2016 at 12:51 pm
May 11, 2016 at 3:33 pm

3	[R-sig-Geo] Warning when stacking, masking or cropping raster objects

Hi all, I'm working on a vignette from the R-OpenSci auunconf, https://github.com/saundersk1/auunconf16/blob/master/Vignette%20BoM.Rmd, and am suddenly getting warning messages where I've never had ...

Adam H Sparks
May 10, 2016 at 6:39 am
May 17, 2016 at 9:06 am

0	[R-sig-Geo] Bagidis semi-distance for tracking data

Hi, Has anyone applied the CRAN R Bagidis package to animal movement data? This semi-distance allows for comparing curves with sharp local patterns that might not be well aligned from one curve to ...

Chris english
May 6, 2016 at 12:20 pm
May 6, 2016 at 12:20 pm

1	[R-sig-Geo] Fwd: R-sig-Geo Digest, Vol 153, Issue 4

Hi, I think there is a more fundamental problem that you should consider. The use of p values and set significant levels are seriously being questioned as good statistical modelling practises. You ...

John Lewis
May 4, 2016 at 2:20 pm
May 4, 2016 at 6:36 pm

6	[R-sig-Geo] Mask a map using statistical significance

Dear all, In climate studies, it is a common practice to perform some statistical test between two fields (maps), and then plot the resulting map using a significance mask. This masking is usually ...

Thiago V. dos Santos
May 3, 2016 at 11:11 pm
May 10, 2016 at 7:50 pm

11	[R-sig-Geo] MODIS package's runGdal() returns error: dataFormat='GTiff', format not supported

Hello everyone, I'm having problems with the MODIS package, specifically, the runGdal() command after the recent update to R 3.2.5. The error I get is this: Error in runGdal(product = product, begin ...

Hakim Abdi
May 2, 2016 at 9:11 pm
May 25, 2016 at 9:43 am

1	[R-sig-Geo] Teaching example of autocorrelated errors affecting interpretation of OLS

HI all, thanks to all those to pointed me towards good environmental data sets for teaching spatial stats in R. We are plugging along on point patterns this week. This next query might be a bit of ...

Andy Bunn
May 2, 2016 at 7:52 pm
May 2, 2016 at 8:01 pm

1	[R-sig-Geo] How the "gSymdifference" of rgoes package calculating the symmetric distance between two polygon

Dear all, I want to calculate the symmetric distance between two polygon. I learned that "gSymdifference" and "gArea" of "rgoes" can be used for that purpose. But I am not getting how this difference ...

Kaushik Jana
May 2, 2016 at 8:03 am
May 22, 2016 at 2:38 pm

2	[R-sig-Geo] Aggregate FIPS data to State and Census divisions

Dear all, I have the following data by US FIPS code. Is there a package to aggregate the data by State and Census divisions? temp <- dput(head(pop1,5)) structure(list(FIPS = c("01001", "01003", ...

Miluji Sb
May 1, 2016 at 3:30 pm
May 1, 2016 at 4:30 pm

2	[R-sig-Geo] problem with predict() in package raster and factor variables

Dear list, I am trying to use the function predict() (in package raster), where I supply: the new data as a RasterBrick, the model (as fit in previous steps and using a different dataset), and a few ...

Gonzalez-Mirelis Genoveva
Apr 30, 2016 at 10:32 am
May 1, 2016 at 9:01 am

1	[R-sig-Geo] Error in checkForRemoteErrors(val) with sfClusterApplyLB()

Hello, I'm trying to run a code that uses the snowfall package. Here is the structure of my code. sfInit(parallel=T, cpus = 5, slaveOutfile="ErrorMessage.txt") sfExportAll() sfLibrary(rgdal) ...

Marine Regis
Apr 28, 2016 at 8:33 pm
Apr 29, 2016 at 7:45 am

0	[R-sig-Geo] How can I apply function using stackApply or Calc, and save the results as raster object in R?

Hi everyone, I have been working in a list of function to process MODIS vegetation index timeseries and return crop cycle paramenters. It's for PhD thesis and I'll process all South America, so I ...

Isaque Daniel
Apr 28, 2016 at 4:34 pm
Apr 28, 2016 at 4:34 pm

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