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visits member for 2 years, 2 months
seen 16 hours ago

Jun
26
comment Simplest way to limit the memory that the raster package uses in R
Thanks @Luke. I ended up using the multiple rows at once approach, making use of the blockSize function. This meant that strain on memory wasn't too high, but speed was still good.
Dec
18
comment If conditional for multiple raster
Can you explain the reasoning behind your conditional statement? What is it you wish to find out? It might be that there is a different way of approaching this.
Jun
6
comment Can ArcMap basemaps be used in figures intended for publication?
In this case it is a national park on the border of Belo Horizonte in Brazil. Pretty obscure I know, so probably explains why I can't find any imagery.
Jun
5
comment Can ArcMap basemaps be used in figures intended for publication?
Apart from MODIS and Landsat imagery which lack the spatial resolution for my figure, can you suggest any other sources of imagery that I could investigate?
May
17
comment Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?
@whuber I have added more detail as you have requested, but don't expect you to help me further if you don't want to. I really appreciate the amount of effort you have put in so far. Thanks.
May
16
comment Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?
@whuber. Thanks again for the update. There is now the issue of clumps clashing, and resulting clumps sizing less than the number defined in size.clusters. How could I make sure a clump grows to the correct size, as, at the moment, I assume it tries to grow into an existing clump, fails, but still registers as a successful expansion. I then also intend to iterate the production of the 60 clumps 1000 times creating an average null model style dataset. Would the random positioning vary each time within a for loop?
May
15
comment Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?
@whuber. Have expanded the question a little based on your answer. Thanks again!
May
14
comment Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?
Hi Whuber. Thanks so much for this, I really appreciate it. I'm just experimenting for a bit and may come back with a few followup questions soon.
May
13
comment Creating randomly shaped clumps of cells in a raster from seeds of 1 cell/pixel?
I would also be happy to use ArcGIS or QGIS. Unfortunately I'm not that familiar with python. GDAL through a bash terminal is also a possibility.
Mar
6
comment A way to log the output from the Msys terminal in OSGEO4W?
Unfortunately, this is still something I don't know how to do...
Jan
31
comment How to use GDAL to burn a selected value from one raster into another?
What would the command be to apply the nodata values from 1 raster to the other then?
Jan
10
comment A comprehensive, user-friendly GDAL manual?
@R.K. The unknown territory I came across today was creation options, commonly used under the -co function I believe. In particular, I wondered which compression type to use for a GeoTiff. They are mentioned but not explained here - gdal.org/frmt_gtiff.html. I also don't understand where the utilities with .py extensions can be used. QGIS maybe? On a broader note, having never been formally taught GDAL I just find the utilities page a bit too technical. I guess my expectations are high, having used ESRI help pages for a while...
Nov
27
comment Getting ArcMap to display rasters properly first time
Very nice! Just what I wanted. Thanks for the quick symbology trick too.
Oct
9
comment How to use -where SQL in an ogr2ogr loop in GDAL/OGR (bash)?
@iant modifying the loop as you've suggested in the link to something like this wclause=newcode="$att" ogr2ogr -where '$wclause' -f "ESRI Shapefile" $OUTPUT/$att.shp $INDATA created a syntax error in the SQL statement.
Oct
9
comment How to use -where SQL in an ogr2ogr loop in GDAL/OGR (bash)?
Have added some more to the question.
Oct
9
comment How to use -where SQL in an ogr2ogr loop in GDAL/OGR (bash)?
Thanks for the second suggestion. Unfortunately, this produces the same empty shapefiles as a result too.
Oct
9
comment How to use -where SQL in an ogr2ogr loop in GDAL/OGR (bash)?
Hi - thanks for your reply. Even with the escape, the shapefiles are coming out empty, so the -where switch isn't working.
Oct
5
comment Is there a difference between projecting shapefiles then rasterizing & rasterizing shapefiles then projecting?
Thanks for the information guys. I have settled on projecting the vectors prior to rasterization.
Aug
31
comment Is there anywhere that I can obtain global UV data in either raster or vector format?
Thanks for the information. I'm trying to access the ftp site but get permission denied...where can I sign up for an account or are there guest credentials that I can use?
Aug
10
comment Is there no EPSG code to use for Behrmann equal-area projection in ogr2ogr?
Anybody please?