Hi,
First, you should try to get a continuous topography raster map from your
contour map.
Then, you could extract values at some points using raster::extract.
Best,
Mathieu
2012/1/18 Saman Monfared
> Hi.
> I try to extract values of temperature in a topography map. It is
> like a contour p
What you describe doing here is substantially different from what you
previously described. Also what you describe doing must be substantially
different, yet again, from what you actually did, since errors would have
been thrown by what you describe doing.
Finally, what you describe doing makes
Hi.
I try to extract values of temperature in a topography map. It is
like a contour plot.
I need the coordinates and temperature of some points.
how can I perform it??
thanks.
--
Saman Monfared
Msc Student,
Department of Statistics, Shiraz University,
Shiraz 71454, Iran
Email: samanmonfar...@
Hi.
I try to extract values of temperature in a topography map. It is
like a contour plot.
I need the coordinates and temperature of some points.
how can I perform it??
thanks.
--
Saman Monfared
Msc Student,
Department of Statistics, Shiraz University,
Shiraz 71454, Iran
Email: samanmonfar...@
On 19/01/12 09:54, Jose Funes wrote:
Hi,
I am trying to create an binary mask and use it to create a ppp object and
to be able to compute a density surface. I have failed in defining the owin
as a mask. Please read code below:
Definition of the window as matrix: from raster to image and from
Hi,
I am trying to create an binary mask and use it to create a ppp object and
to be able to compute a density surface. I have failed in defining the owin
as a mask. Please read code below:
Definition of the window as matrix: from raster to image and from image
image to matrix
sudan1 <-readGDA
Klaus,
I believe I have fixed this problem in version 1.9-64. Please let me know
if not.
Best, Robert
On Wed, Jan 18, 2012 at 1:04 AM, Klaus Jacobi wrote:
> This morning I changed from raster version 1.9-63 back to 1.9-58 and my
> script is functioning again.
>
> Fortunately, the previous downlo
Dear Vikram,
It is not good to calculate NDVI from DN. The purpose of DN (digital
number) is only for packing as much information as possible into a given
âBIT-sizeâ (in Landsat 8-bit/pixel/band).
DN is practically the radiance (I think TOA?) modified with an offset
and a gain in order to pr
Dear Jorge,
thank you very much for the help. i have used the same landsat package
but did not convert on the ground reflection but the on sensor reflectance.
For MODIS and AVHRR, i need better spatial resolution that is the reason
i am using landsat and I was not getting negative values even pla
Hello list,
I am working with landsat images and would like to create a phenological
cycle with NDVI.
I am using R for that but NDVI values changes if i use on sensor
reflectance instead of DN values i.e. giving different result in every case.
I tried to compare histograms seems to have changed
This morning I changed from raster version 1.9-63 back to 1.9-58 and my
script is functioning again.
Fortunately, the previous downloads of zipped packages are kept on the local
hard disk - but only, if a package is updated, not when it is uninstalled.
Klaus Jacobi
--
View this message in contex
Hi,
I've juste read this article about a map published on NYT
http://blog.revolutionanalytics.com/2012/01/nyt-uses-r-to-map-the-1.html
The map has been created using R. Actually, the map is all about
non-overlapping labels which algorithmic placement.
http://revolution-computing.typepad.com/.a/6
Hi,
For those would be interested, I had published an article on my blog about
the calculation of intervisibility along a line.
http://datagistips.blogspot.com/2011/09/on-road-with-r-grass-intervisibility.html
It's one example of using GRASS together with R packages: a combination of
spgrass an
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