Edzer (and all),
I don't think that it's related to an unrealistic range. I've tried a
lot of different realistic and non-realistic values and get singular
results each time. If I divide the X and Y coordinates by 10, 100, 1000
or 1 I don't get singularity. Using Lat and Long works fine. C
The following R example might be a bit off-topic, but it does show how
to create a point grid
and then use it to extract samples from an underlying set of vector
polygons. The vector polygon
data could probably be replaced by a raster grid. Though not a very big
one, given R's memory
limitation
On Wednesday 10 December 2008, Rob Robinson wrote:
> Help - please! :-)
> I have what I thought was a really simple problem. I have a raster image
> of satellite data from which I would like to extract an arbitrary (but
> simple rectangular) portion for subsequent analysis (which I'll need to do
>
Hello David,
I am not sure I completly understand what you want to do, but Hawths
tools (a free add in for arcMAP) has a resampling function that may be
of use: http://www.spatialecology.com/htools/rndselss.php. Spatial
analyst also has some resampling functions. If you have access to ESRI
Help - please! :-)
I have what I thought was a really simple problem. I have a raster image of
satellite data from which I would like to extract an arbitrary (but simple
rectangular) portion for subsequent analysis (which I'll need to do for many
images). I have the data as a (projected) SpatialGr
Hi all,
I apologize in advance, I haven't the time today to comb the help list
for tips and hints, but does anyone know how to resample a 20 by 20m
grid so the operational spacing is down to a 10 by 10m grid?
Any assistance is MUCH appreciated!
--
David Depew
PhD Candidate
Department of Biolog
On Wed, 10 Dec 2008, zack holden wrote:
Dear list,
I would like to use points to extract values from underlying grids,
modifying my query to return the mean, standard deviation, or other
function of the cells adjacent to the center grid cell. I assume this is
possible, but I can find no exa
