These filters are easy to implement and are available in contributed R
packages, but they are not very good. When you say satellitedo you mean
Argos or GPS?
Argos recently updated their proprietary algorithms to give better
estimates but it it is still a rather black box.To me the issue is about
Hi,
once a Postgis layer X is retrieved, how can I juggle with subsets of X?
eg. I am working with bubble plots on a EU dataset but I want to do test it
only using a 30x30Km in the nearby of Rome and I have no attribute data but
the value I use for the bubbles. Should I use subset? Can I set a
assuming your geometry column is 'the_geom': while querying
SELECT ... FROM ... WHERE the_geom @ ST_geomfromtext(...);
with ST_geomfromtext() you can set up your custom bbox.
But of course you can load everything into R and then use subset() if your data are in a data.frame
or use over() with
Roger Setting the repositories as suggested worked well, for these and one
other package I'd been having trouble with. gLength worked fine once I got them
working. I was only talking about single-ring polygon objects.
Robert The shapefiles were indeed in lat/long, so the fact that
Am 09.11.2011 15:39, schrieb Mathieu Rajerison:
Hi,
I have a RasterStack detm composed of a dem and a dtm.
I wanted to apply the difference between dem and dtm so as to get the
elevation.
But I got the following message (in French):
Erreur dans result[, i]- readBin(raster@file@con,
Leni,
If you have raster data in Arc and export as GRID it will create a database
(folder, including a parallel folder called info) that you can treat like a
file and open in R. Alternatively you can export to tif, img (erdas) and
other formats (avoid ascii) that raster can read (most of them via
Hello!
Trying to decide the best way to store a large amount of data in a
function I am writing using the raster package.
The goal is speed. I need to flexibly and efficiently handles cases
where 10 to 5000 copies of a raster are required. The raster that
requires replication would
Ok, thanks for the answer. It must be a problem of disk space.
I'll try what you say.
Best,
Mathieu
2011/11/9 Robert J. Hijmans r.hijm...@gmail.com
Mathieu/Carsten,
Carsten's suggestion is also good:
elev-overlay(detm@layers[[1]],detm@layers[[2]],
fun=function(a,b) {return(a-b)} )
