1,954 reputation
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bio website staff.acecrc.org.au/~mdsumner
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visits member for 4 years, 1 month
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R, Manifold, GDAL, also interested in Python, topojson/D3 and NetCDF/HDF


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
Jul
24
comment Are latitude and longitude independent of each other or correlated?
This question totally depends on the movement of the GPS device, not on longitude/latitude per se - surely you want to know about the actual space in which the thing is moving, longitude/latitude are just one way to represent that. (See the "Moving objects, trajectories" section in this CRAN Task View for a few pointers to software in R: cran.at.r-project.org/web/views/SpatioTemporal.html) KDE is a poor way to handle noise in tracks imo, how to deal with the temporal dimension and serial autocorrelation? Also, use map projections for a real world space rather than ellipsoid angles.
Jul
24
comment Are latitude and longitude independent of each other or correlated?
There is a clear difference in the distribution of longitude for a given latitude. (If you are near a pole you barely need to know the longitude compared to other places).
Jul
20
comment Generating polygons with shared boundaries using QGIS?
Surely qgis has a suite of snap-to controls. That would do it wouldn't it?
Jul
19
comment NAs not allowed error message in attempt to plot raster object in R
Please show all the code used. Can you point to an example file.
Jul
3
comment Conversion problem of projection of MODIS LAI from sinusoidal to geographic
I understand, I just think you have a job to do but this is a distraction. If this is the job, confirm the source crs is right and then use projectRaster to transform to the target crs. What is projection(lai_real) directly after you load it with raster?
Jul
3
comment Conversion problem of projection of MODIS LAI from sinusoidal to geographic
projection()<- assigns a crs, it does not do the transformation. Do you really need to warp this yhing or do you just want to extract from it?
Jul
2
comment Which projected coordinate system should be used for mapping the US?
colorado.edu/geography/gcraft/notes/mapproj/mapproj_f.html andhttp://www.georeference.org/doc/guide_to_selecting_map_projections.htm
Jun
29
comment How to exactly georeference in QGIS
More details please.
Jun
26
comment Processing HDF4 data in R
HDF4 can be built into rgdal by building it into GDAL, it's not straightforward: scigeo.org/articles/…
Jun
25
comment Map project a raster having separate latitude and longitude raster bands
My email is in my profile. Send a link to the original source rather than the file if possible
Jun
25
comment R plot raster with real colors
Use raster or brick on the file name, not via rgdal. If it is a palette raster() and plot will work, if rgb then brick and plotRGB will work.
Jun
25
comment Map project a raster having separate latitude and longitude raster bands
Can you point to a specific file? I am keen to check it out