Statistical computing language and software environment.
7
votes
1answer
93 views
spatial and spatiotemporal analyses
I have a dataset that consists of 247 mosquito traps placed in fixed positions and sampled weekly for 23 weeks. I also have dengue disease incidence data (indexed to home address) during the same time ...
1
vote
1answer
269 views
How do I implement 'weighted' kriging in R?
I'm trying to interpolate the values of an attribute (called "disease_rate") that i've sampled at a set of spatial points and i'd like to add 'weights' to the resulting kriging estimates.
Basically, ...
4
votes
0answers
96 views
Route analysis in R based on the OSM transport network: possible?
I'm analysing the likely paths taken by commuters on their way to work, based on Census flow data, job density distributions and the transport network.
At the moment I'm using pgRouting and the ...
4
votes
0answers
434 views
How to get rpy2 for QGIS on OSX?
I am a new QGIS user, have installed QGIS on a Mac running Snow Leopard OSX 10.6.8 following all the instructions. QGIS seems to work well for everything other than when I boot up I get the message
...
3
votes
0answers
104 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 ...
3
votes
0answers
184 views
How to Export a Shapefile as KML Using R
All,
I have exported an ESRI shapefile (polygon) to KML using R, but the resulting layer shows only the outer extent of the polygon.
How can I fill in the area with a color?
Any help is greatly ...
3
votes
0answers
109 views
How do I access layer attributes from within QGIS' manageR plugin?
This is probably a fairly basic question, but searches for manageR come up with a lot of noise, and there's no manageR tag. What I'd like to do is load the attributes from a particular field of a ...
3
votes
0answers
137 views
Rgeos drops associated values when intersecting polygons
I am trying to intersect two SpatialPolygonsDataFrames and get a SpatialPolygonsDataFrame as the result. Unfortunately, using the gIntersection function from rgeos (which works impressively quickly ...
2
votes
0answers
69 views
MODIS Level 1B batch process
I am a new MODIS Level 1B user. I have been using the MODIS Swath tool to process my images.
However, I have over 1000 images to process. I was wondering if there a script available in IDL or R (very ...
2
votes
0answers
88 views
Moving point on OpenStreetMap route
Basically I generate random numbers in R language which are indeed times between bus arrivals.
I need to simulate a moving point(a bus) in OpenStreetMap by using this generated numbers.
I have read ...
1
vote
0answers
39 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
0answers
19 views
kriging Error dimensions do not match: locations xxxx data yyyy in R
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 ...
1
vote
0answers
59 views
Why Stacking rasters return all values as NAs?
I have several rasters that I want to do some calculations ,basically calculating the moving average.
dir2 <- list.files("D:\\2010+2011", "*.bin", full.names = TRUE)
...
1
vote
0answers
198 views
How to clip the contour map with the polygon using R software?
Hi I am wondering how can I create the contour lines from the discrete x, y and z dataset and then add the shapefile to cut the contour lines by polygon.
I want to clip the contour map by the shape ...
1
vote
0answers
323 views
Raster grid for zonal statistics in R
I have two raster layer, the first one r is my zonal mask as a raster grid, and I created as:
ext <-extent(Yraster)
r <- raster(nrows=32,ncols=32,ext)
r[] <-(1:ncell(r))
and project it ...
1
vote
0answers
154 views
How to load big ASCII rasters in Revolution R?
Is there anyone in this site using Revolution R with big spatial data ?
I am trying to load raster files (ascii format) into revolution r using the xdf format, with no luck.
Did anyone tried this ...
1
vote
0answers
265 views
Administrative level and coordinates from Yahoo GeoPlanet WOEID
The Yahoo GeoPlanet data can be freely downloaded from:
http://developer.yahoo.com/geo/geoplanet/data/.
If I understand it correctly, each WOEID corresponds to a unique location on earth, with ...
0
votes
0answers
85 views
R Raster package: write NetCDF with time dimension
I am writing a rasterbrick with multiple layers to a netcdf file using the raster package in R:
writeRaster(gridfile, "Data", "CDF", overwrite=TRUE,
...
0
votes
0answers
43 views
R-raster versus ArcMap Bioclim clipped values differ?
I have a set of lat/long ccordinates for which I wanted to pull corresponding BioClim (1-19) values. I first used ArcMap, without interpolating, and came up with a set of data. I then used R's ...
0
votes
0answers
109 views
Making a Bridge Classification tool in GRASS GIS
I'm working on a tool for classifying bridges with GRASS. I have been using examples online but I've come to a standstill as how to actually make this tool in GRASS. I have my raster of my area and ...
