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22h
comment Re-projecting raster from laea to geographic coordinates (WGS84) using R?
(No you don't need to). This is a massive grid, read the vignettes in the package for info on efficient processing. I would just use GDAL directly though, there are inefficiencies in the GDAL-to-raster pipeline that you can avoid that way.
22h
comment Re-projecting raster from laea to geographic coordinates (WGS84) using R?
This is a raster, you don't need to reproject to the lowest common denominator just to subset and extract information. Write your queries to extract from the raster as-is, the raster package has everything required.
Jul
22
comment Merge multiple SpatialPolygonDataFrame into 1 SPDF in R (analogue to “Merge” Tool in ArcGIS)
Super easy solution provided by Robert Hijmans, the author of raster :)
Jul
21
comment Merge multiple SpatialPolygonDataFrame into 1 SPDF in R (analogue to “Merge” Tool in ArcGIS)
See ?rgeos::gUnion and / or ?raster::union
Jul
15
revised How to find the distance from a point to a polygon, via another point, in R
need raster for projection, data( wrld_simpl) too
Jul
15
comment How to find the distance from a point to a polygon, via another point, in R
dput doesn't work on all sp objects, unfortunately. can you flesh them out more manually?
Jul
13
answered How to display the map within two longitude lines
Jun
30
comment rgdal with multiple Feature Datasets in R
I reckon the versions are the key here, and it may even be different systems. When you start library(rgdal) it prints out what is required, and sessionInfo() completes the story (though devtools::session_info() is much better).
Jun
30
comment rgdal with multiple Feature Datasets in R
When you say "others get" are they using the same R and rgdal versions and are you sure it's the same data source?
Jun
29
comment Getting warning when opening NetCDF file using gdal?
the file is this one: oceandata.sci.gsfc.nasa.gov/cgi/getfile/… available here oceandata.sci.gsfc.nasa.gov/MODISA/L2/2015/069 via navigation from oceandata.sci.gsfc.nasa.gov
Jun
29
comment Getting warning when opening NetCDF file using gdal?
This is one for the gdal-devs, point them to details about the format change to netcdf4: oceancolor.gsfc.nasa.gov/DOCS/FormatChange.html Possibly also this exchange could give you some clues, but I'm not hopeful about it: lists.osgeo.org/pipermail/gdal-dev/2015-February/040973.html
Jun
26
comment What coordinate data could this ASCII file represent?
Always. Reproducibility is the aspirational standard.
Jun
26
comment What coordinate data could this ASCII file represent?
No information means no information I'm afraid. Until you get a nice picture there's no way to be sure.
Jun
26
comment Raster alignment terminology?
I would say that if they share the same resolution, alignment, offset, scale and coordinate system then they are the same raster.
Jun
25
comment Creating a new raster layer based on mean of other raster layers, ignoring NA values in R
Well you must not be using this code I guess. Can you provide useable code? Don't use "mean" as a variable name either, it's already a function.
Jun
25
comment Creating a new raster layer based on mean of other raster layers, ignoring NA values in R
What package provides an overlay method for numeric?
Jun
25
comment Heatmap on globe - distortion problems
(If anyone wants to explore this in R I recreate it here, requires a github package plus CRAN ones: gist.github.com/mdsumner/a3d2277bae7cd8082302)
Jun
21
comment Different kinds of time+spatial data
Pebesma has a paper on this: cran.r-project.org/web/packages/spacetime/vignettes/jss816.pdf It's easy to overcook your own defs though, in ways that don't actually work for others
Jun
19
comment What raster-based GIS systems really work?
R's raster package totally kicks serious raster butt, it's not perfect but there's nothing better.
Jun
14
comment Equal Area Projection for Indonesia - Standard Parallels
The standard parallels are where "true scale" lies, and to the north and south distortion increases. Putting them nearer to the centre means that more of the central region is "optimal". Also, see this for conic discussoin generally en.wikisource.org/wiki/The_American_Practical_Navigator/…