1,884 reputation
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bio website staff.acecrc.org.au/~mdsumner
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visits member for 3 years, 9 months
seen 58 mins ago

R, Manifold, GDAL, also interested in Python, topojson/D3 and NetCDF/HDF


2d
comment Kernel Density Analysis using R and ArcGis
Try library(raster); raster(denRedwood) and see ?writeRaster for tiff etc. You'll need to restore the crs which spatstat does not have. See ?projection
Aug
23
comment How to correctly resize raster GIS images to a given px width?
add -co TILED=YES and -co COMPRESS=LZW for more efficient access and storage, if your target usage can utilize those options
Aug
23
answered How to produce “SpatialPixelsDataFrame” from stacked RasterLayer?
Aug
18
comment Using very large image formats with GDAL
and -co COMPRESS=LZW
Aug
14
comment How to extract DEM (Digital Elevation Model) from 3D model
Can sketchup write any of these with z as attribute or coordinate? gdal.org/ogr_formats.html. If so then this should help: gdal.org/gdal_rasterize.html
Aug
13
comment Viewing/understanding NetCDF files
Usually by start and count for each dim. You save storing unnecessary values, i.e. redundant coordinates for every element. Still, relational dbs are ultimately more efficient but CSV is pretty low grade in that arena.
Aug
13
comment Viewing/understanding NetCDF files
It really depends on which files and sometimes which tools you need to usr, it is a very general format. R's raster package and GDAL have high level models of a wide variety of files, most other interfaces are very low level: gis.stackexchange.com/questions/109191/…
Aug
11
awarded  Caucus
Aug
8
comment Whats an appropriate map projection for georeferencing aerial photos?
Matej: you don't need to use the source's projection to georeference with it, you can transform between coordinates. It really shouldn't matter on such a local scale, a local Orthographic would be fine - I'd say it depends more on what you want to use it for and the features/limitations imposed by that.
Aug
7
comment (How) can I write string data to a raster with Python/GDAL?
Start here:trac.osgeo.org/gdal/wiki/rfc40_enhanced_rat_support
Aug
7
comment Looking for Melbourne shapefile?
data.vic.gov.au
Aug
4
comment Are there examples of high-level interfaces to NetCDF
That is right, I didn't mean to imply that. I want analogues to raster or GDAL. But, actually it would use GDAL if neither ncdf or ncdf4 were available and NetCDF were built in to GDAL. But not relevant really
Aug
3
awarded  Student
Aug
2
comment Is there anyway to stack or merge .hdf files in R Studio?
This does work pretty well if you can compile HDF 4 and Netcdf in to GDAL and in turn to rgdal and ncdf4. Straightforward more or less in Linux.
Aug
2
revised Are there examples of high-level interfaces to NetCDF
added 104 characters in body
Aug
2
asked Are there examples of high-level interfaces to NetCDF
Aug
2
comment Memory leak with GDALOpen?
This really belongs on gdal-dev
Jul
31
comment ArcGIS 10.2 Windows 7 only uses 4Gb of RAM
This is really amazing.
Jul
30
comment What's the difference in these two shp files?
One is UTM and one is long/lat. The plotting does not automatically transform one to another (alas).
Jul
27
comment How to “lower the resolution” of a lat long csv
Complain to the providers for giving you a hopeless format. Use GDAL tools to recover