1,824 reputation
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bio website staff.acecrc.org.au/~mdsumner
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visits member for 3 years, 5 months
seen 42 mins ago

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


Dec
3
comment How to create a 4096x4096 png from a 1440x720 data set using GDAL?
use VRT to embed your image within the larger virtual one
Nov
27
comment Which GIS (with GUI) produces good-looking maps for a reasonable price?
poor diddums so sad
Nov
23
answered Which GIS (with GUI) produces good-looking maps for a reasonable price?
Nov
17
comment How to stop gdalwarp creating world-spanning outputs near the dateline?
maybe use -te argument for "target extents", or fix up the extents first using gdal_translate with a_ullr to overwrite the existing, or -projwin to cut out the bit you want within the bounds
Nov
10
awarded  Yearling
Oct
29
answered How to reproject raster from 0 360 to -180 180 with cutting 180 meridian
Oct
9
comment Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS
It would still be troublesome for someone.
Oct
9
comment Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS
yes fair enough, but you can see what's being compared in the original doc (added with edit)
Oct
9
answered Looking for a user-friendliness & functionality comparison for ArcGIS and QGIS
Sep
20
awarded  Nice Answer
Aug
14
comment Why does gdalbuildvrt not allow these things?
As with any warping, it's about generating a new grid of (possibly "rotated") points across the inputs and resampling with them via a given method (nearest neighbour, bilinear interpolation). Plenty of tools can do it to various levels of control, including gdalwarp, which will actually build VRT for you with -of VRT.
Aug
11
answered Why does gdalbuildvrt not allow these things?
Apr
11
comment Cannot replicate gdaltransform example
You should drop FWTools and get a newer build, yours is way out of date. There are installers for Windows here, so it's not the same as FWTools but easy enough: gisinternals.com/sdk
Apr
3
revised Free api to reverse geocode latitude, longitude to census tract?
The maps package already provides the 'state' database, mapdata contains extra detailed data sets for China, Japan, New Zealand, world rivers and coastlines. So, the use of map() here works without mapdata . . .
Apr
3
comment Suggestions for an efficient way to store raster files for lab use?
It really depends on how your data come to you, what you need to do with them and how/if you need to ship them to others. There are so many options this question needs more details about your needs.
Apr
3
suggested suggested edit on Free api to reverse geocode latitude, longitude to census tract?
Apr
3
comment How to load big ASCII rasters in Revolution R?
Hmm, I was assuming you meant the "ESRI ASCII" grid format. Why Revolution R? Just memory issues? If these really are raster grids then that package in R is good, otherwise maybe the ff package for general out-of-memory data structures.
Apr
3
comment How to load big ASCII rasters in Revolution R?
If you have big rasters why are you storing them in this format? But, if you can install rgdal just load it with x = readGDAL("file.asc"), or for better memory handling the raster package with x = raster("file.asc"). It depends on what you need to do with them . . .
Mar
7
answered How to easily shift all features in a vector dataset?
Nov
29
awarded  Nice Answer