For doing this within R also have a look at ggplot2, with a simple sin
and cos one could use geom_segment
http://had.co.nz/ggplot2/geom_segment.html
Bart
On 09/16/2011 04:22 AM, Dylan Beaudette wrote:
This comes to mind:
http://casoilresource.lawr.ucdavis.edu/drupal/node/989
Note shameless
I've done something similar for my own work (based on polygon
centroids, but the idea is the same). The following (messy) code
should do what you want using base graphics. The inputs are the
coordinates of your cell centers, the angles of your arrows, and then
a few additional parameters which
Hi List,
I've got a railroad shapefile and a corine land cover raster.
I'd like to perform a land cover comparative analysis between the west side
of the railroad and the right side.
To do that, I tried first to have a raster with values=1 when on the east
and 0 when on the west.
But my
Dear all,
I am new to spatial and point process analysis (as well as R), however most
of my Ph.D. will rely heavily on these tools *sighs :) I am starting a new
chapter where I intend to model elasmobranch i.e., shark and skate catch in
the Northwest Atlantic Canadian waters using point process
On Fri, 16 Sep 2011, GodinA wrote:
Dear all,
I am new to spatial and point process analysis (as well as R), however most
of my Ph.D. will rely heavily on these tools *sighs :) I am starting a new
chapter where I intend to model elasmobranch i.e., shark and skate catch in
the Northwest Atlantic
If your railroad is just a single line feature running approx N-S then:
Create a box polygon for your study area, make sure the railroad just
crosses it at N and S edges
Use rgeos functions overlaying the RR line with the box polygon to
create the E and W polygons
Job done?
On Fri, Sep 16,
On Fri, Sep 16, 2011 at 4:51 PM, Barry Rowlingson
b.rowling...@lancaster.ac.uk wrote:
If your railroad is just a single line feature running approx N-S then:
Create a box polygon for your study area, make sure the railroad just
crosses it at N and S edges
Use rgeos functions overlaying the
Dear all,
I am using raster's projectRaster to project a raster of a categorical
variable to a grid of coarser resolution (which I specify using another
raster object as the 'to' parameter). Rather than assigning the new cells
the value originally found closest to their centers (i.e. the 'ngb'
Dear list,
In order to allow others benefiting from my errors, see below a presentation
of a problem and it's solution by Roger Bivand (Thanks !).
##
I want to use natural breaks (jenks) method to find class intervals into
raster's values in order to plot it
[Colleagues: Please forward this to any interested parties. Thanks!]
The Department of Geography in the School of Earth, Society and
Environment at the University of Illinois at Urbana-Champaign is
looking for a Lecturer to fill a key teaching position in our
Geographic Information Science
R-sig-geo'ers:
I wanted to run aggregate on a *degree* based azimuth image, with a
circ.mean resampling. Since you can't just average degrees and get
the right answer (e.g. the arithmetic mean of 359 degrees and 1
degrees is 180, but the true mean direction is 0), I adapted the
circ.mean
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