Statistical computing language and software environment.

learn more… | top users | synonyms

2
votes
1answer
851 views

combine raster and polygon values in R

My question is similar to this one Get Raster Values from a Polygon Overlay in Opensource GIS Solutions but I think I need another step. I have a polygon layer of ecoregions which I brought into R ...
4
votes
1answer
679 views

Replace NA's with 0 for raster data using R

I am new in R. How can I replace NA's with 0 for my raster data which have spatial information?
1
vote
2answers
188 views

How to modify the results of a geological dataset from vertical to horizontal?

I have a 3-D point shapefile of a geological fault dataset consisting of x,y, and z columns. I need to create a raster dataset from this point dataset. I have been trying to do this in ArcGIS; ...
3
votes
2answers
3k views

Choosing the correct value for proj4string for shape file reading in R “MapTools”

I am having a shape file of polygons and another CSV file which contains a list of points as (Lat, Lng) pairs.. I want to check for each (lat, lng) pair from the CSV file which polygon does it fall ...
3
votes
0answers
128 views

Can extracting raster values work in polygons' CRS without raster resampling?

I am trying to extract raster values using polygon layer with different CRS. Raster is in WGS84 (EPSG:4326) and the polygons in UTM (EPSG:23031). 1. If I want to work in the projection of the ...
27
votes
2answers
3k views

How can I conduct Geographically Weighted Principal Component Analysis using ArcGIS, Python and SPSS/R?

I am after a description/methodology for conducting a Geographically Weighted Principal Components Analysis (GWPCA). I am happy using Python for any portion of this and I imagine SPSS or R being used ...
2
votes
1answer
323 views

Bubble Plots in R not displaying

I was attempting to follow a tutorial to create a bubble plot of school district proficiency rates. Data shapefile of school districts (Census2010.shp) ...
2
votes
0answers
298 views

Ordinary kriging with three dimensions in R

I want to interpolate temperature for a surface defined by three coordinates: longitude, latitude and altitude. I know one option is to use universal kriging on two dimensions and use altitude as a ...
2
votes
1answer
168 views

Several algorithms done for topographic correction => black spots - how to solve?

I have done several algorithms for topographic correction in R including simple cosine, Minnaert, SCS. The input data aspect and slope for the hillshade raster have correctly been done in radians. The ...
2
votes
2answers
1k views

Checking if Lng and Lat fall inside polygons from ESRI Shape file

I have two input files. First: CSV file with a list of points each defined with Lng, Lat, Name Second: ESRI Shape file defining a number of polygons I would like to determine for each point I have ...
-1
votes
1answer
427 views

WinBUGs giving 'Illegal memory write error' running under wine [closed]

Ok some I am trying to use Winbugs to do spatial smoothing. I am running r code in R study and using R2WinBUGS to call Wine 1.4 under Mac OSx Mountain Lion. It works ok for some models but for the CAR ...
0
votes
0answers
91 views

Why does a shapfile shift after transformation?

I have a shapefile created in the raster package (ER_14.3_2000_poly). > #read in a raster file > ER_14.3_2000<-raster('E:/Ecoregions Models/Outputs/ER_14.3/ER_14.3_ConsensusMap3.asc') > ...
2
votes
1answer
521 views

extracting data from rasters using shapefile boundaries in r

I have a raster.stack of 8 environmental variables and a shapefile of Ecoregions for the southern U.S. files<-list.files(path='E:/Ecoregions Models/Border Bioclim/',pattern='asc', ...
4
votes
2answers
389 views

Draw two separate lines from A to B and B to A

I have an Origin-Destination table like this Origin Destination Value A B 10 B A 100 A C 120 ... For all the locations A, B, C... I have another table indicating their location (Lat and Lon) Is ...
11
votes
3answers
4k views

Which is the best way of working with PostGIS data in R?

I work with R almost all the time, and now I am using it for doing spatial data mining, but I have this question: I have a PostGIS database with (obviously) GIS data, If I want to make statistical ...
1
vote
1answer
656 views

How to save R raster plot for ArcGIS raster file

I want to save my raster plot that produced with R to ArcGIS raster (.img, .tif and ASCII) file.
1
vote
1answer
138 views

r raster package rasterize failing:no slots

I'm having trouble rasterizing a shapefile using the raster package in R. shp<-shapefile(ZoneShape); lcRas<-raster(lcRaster); r<-raster(ncol=ncol(lcRas), nrow=nrow(lcRas), crs=CRS); ...
3
votes
2answers
998 views

Add Numbers to United States Map Help R, R-Studio?

Can someone help me with creating a map in R? I need to make a map of the number of retail stores a company has in each state. All I need is the store count displayed in each state. For example: ...
3
votes
1answer
1k views

Setting extent and geographic projection in R

I have a raster and a shapefile that I am attempting to view and process in R. The shape file "ER_11.1" has the following specs: > ER_11.1 class : SpatialPolygonsDataFrame nfeatures : 22 ...
1
vote
1answer
407 views

Overlay points over gadm map

This is a crosspost with stackowerflow and I hope for understanding and that it will no be closed as it concerns both cartography and R. I have already asked about plotting points dependent on ...
3
votes
1answer
572 views

Find clusters of points based distance rule [duplicate]

I have some points that I need to divide into groups based on clusters of points: x <- c(-1.482156, -1.482318, -1.482129, -1.482880, -1.485735, -1.485770, -1.485913, -1.484275, -1.485866) y <- ...
2
votes
0answers
132 views

Plot points map of population [closed]

I want to plot kind of isarhytmoc points map like in this tutorial, but with population data. However, unfortunately, I have no enough skill and only came with such code: require(sp) require(rgdal) ...
2
votes
1answer
856 views

Correlation between rasters using R

In R, anyone know a method for measuring correlation between raster and spatialpixels, or between two rasters?. I read something about Kulldorff but do not understand how to use it, and maybe it's not ...
13
votes
2answers
5k views

Clipping a raster in R

I am building a map for the northeastern U.S.A. The map background needs to be either an altitude map or a mean annual temperature map. I have two rasters from Worldclim.org which give me these ...
6
votes
4answers
811 views

animated map in R

everybody, sorry for disturb, but I am being quite new with r faced a crucial difficuty: I want to create an animated map of Russin with changes in unemployment with differnt years, like. On the image ...
5
votes
2answers
400 views

R packages for deriving spatial clusters from origin-destination matrix

I have a matrix of origin-destination flows and I am trying to figure out the best way to derive X number of functional spatial clusters from the data. I haven't done this particular type of analysis ...
4
votes
1answer
934 views

Zonal Statistics for Polygons with R

I'd like to do zonal statistics / terrain analysis with polygon overlays - I achieved to get min / max like so: library(raster) library(rgdal) alt <- getData('alt', country = "AT") gadm <- ...
4
votes
1answer
379 views

R gridding and contouring options

I want to make an interactive web mapping application, which will grid and contour user data. My plan is to implement R scripts with Shiny, but the only R package I can find to do this is gstat. And ...
7
votes
1answer
151 views

Open source implementation of “feature density” algorithm

I'm working on a dataset of house searches - 1 polygon for each area in which people want to find a house from an online search tool. This produces many overlapping polygons. It would be great to ...
1
vote
0answers
597 views

Validation of Regression Kriging

I am interested in exploring the idea of generating a predictive model for a target variable in a spatial context. I would then like to correct the residuals of this model using kriging, i.e. in a ...
1
vote
1answer
2k views

rpy2 installation ERROR “Tried to guess R's HOME but no R command in the PATH”? [closed]

I tried to install rpy2 (pip install rpy2). I want to use the SDAPP4 extension with QGIS (QGIS shows up the message missing rpy2...). The system tells me always the same error: Tried to guess R's HOME ...
7
votes
4answers
4k views

How to split a vector in equal smaller parts in QGIS or similar?

i want to divide a shapefile with many tiles into a lot of smaller tiles. I am searching for a smart solution, because manual edits are out of questions Anyone can help or know a nice function?
9
votes
4answers
7k views

How can I export raster data from Arcmap to an R *.grd file format?

I want to work with raster data in R, but I have problems exporting my raster dataset from ArcMap. By "export data"/GRID I get a file with an *.aux extension. What I need is *.grd. Can anybody help ...
8
votes
2answers
494 views

Problem with plotting map in R

While plotting the gadm map of Russia in R, I have a problem at the 180 degree meridian, where part of the Russian region is plotted separately. You can see it on the plot using the following code ...
1
vote
1answer
121 views

Use of Grass and R w.r.t. Land Use Prediction

In my data mining term project I need to conduct a work on geospatial data related to a big city to show possible urbanization fields in next years. I've used GRASS lately on other projects so I'm a ...
2
votes
1answer
332 views

Confused about reprojecting Google Maps (latlong) to Irish Grid TM65

Trying to transform points taken from Google maps (as latitude and longitude) to Irish Grid TM65 using the spTransform in R, and I'm confused on something. Everything I find on the net tells me ...
1
vote
1answer
135 views

Remove parts of line that fall within a polygon

I have a polygon and two lines. How can I remove the portion of each line that falls within the polygon? # polygon coords <- matrix(c(-1.798123, -1.793072, -1.805767, -1.804129, -1.798123, ...
4
votes
1answer
2k views

Raster spplot legend: how to add a title beside it

After studying for a while how to create a chart from a raster object, I got almost everything I needed except to add a title to spplot's legend. What I tried: to use mtext("XXX (m)", side=4), ...
4
votes
2answers
160 views

remove segments of lines in R

I have these 3 lines: line1 <- matrix(c(-1.81209, -1.80470, -1.80616, 55.68024, 55.67947, 55.67544), ncol=2) line2 <- matrix(c(-1.80468, -1.80330, -1.79690, 55.68322, ...
9
votes
2answers
1k views

How to speed up the plotting of polygons in R?

I want to plot the country borders of North America over a raster image depicting some variable and then overlay contours on top of the plot using R. I have been successful in doing this using base ...
1
vote
0answers
119 views

kriging Error dimensions do not match: locations xxxx data yyyy in R [on hold]

I've been working (for hours) on a kriging problem. When I run an ordinary kriging model: y.ok <- krige(y~x, locations=data1,newdata=data2), I keep getting the message: Error dimensions do ...
13
votes
2answers
1k views

How to generalize SpatialPolygons and conserving topology in R?

I would like to generalize a SpatialPolygonsDataFrame in R to make plotting more efficient. The polygons I have result in huge pdf plots that are slow to load and hard to integrate into a document. ...
8
votes
2answers
614 views

Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?

As my title says, I wish to "grow" clumps of cells from seeds within a raster. My base raster is full of 1's and 0's, 1's indicate land and 0's sea/NA areas. From the 1's I wish to select 60 random ...
1
vote
1answer
892 views

Mosaic large dataset with R

I need to merge together 20 32 bit tiff. For that I tried ArcGis but it keeps crashing (the individual tiff are about 1GB). I need a finale Tiff in order to run some analysis and I figured that having ...
0
votes
1answer
399 views

Extraction of raster cell values based on 'rgeos' and 'raster' buffering approaches in R

I am trying to extract cell values from a raster that lie within a certain distance from a given location (i.e. buffering). Evaluating different approaches, I found out that applying gBuffer(..., ...
2
votes
2answers
1k views

Built a query for polygon Shapefile in R

I use the package maptools to read in Shapefiles in R. I would like to know if there is a function that can built up a query/subset to select only some Polygons based on a specific attribute in the ...
6
votes
2answers
3k views

How to extract values from rasters at location of points in R?

My question is about extracting values from rasters at the location of points. With the function extract this is very easy, and the function gives me a dataframe with the values of all the variables ...
6
votes
3answers
3k views

How to efficiently read and reclassify many rasters in R

I've been tasked to create a suitability analysis of wave conditions in the Gulf of Mexico. I have 2 thousand or so raster files that are about 8 MB each (2438 columns, 1749 rows, 1km cell size). ...
13
votes
1answer
5k views

How to create an attractive choropleth map in R?

I've been experimenting with choropleth mapping techniques in R, having reaped the benefits of ggplot2 for creating beautiful graphs within a powerful data analysis package. When it comes to mapping ...
1
vote
2answers
419 views

Calc vs. Overlay for speeding up band math in R 'raster' package?

Regarding yesterday's question about how to speed up band math in the R 'raster' package, would it be the same to use overlay to calculate NDVI instead of calc? If that's not the case, what's the ...