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>>
>> Message: 1
>> Date: Sun, 15 Jul 2007 07:40:12 -0600
>> From: Philip Riggs <[EMAIL PROTECTED]>
>> Subject: [R-sig-Geo] map algebra with ascii grid
>> To: r-sig-geo@stat.math.ethz.ch
>> Me
--
>
> Message: 1
> Date: Sun, 15 Jul 2007 07:40:12 -0600
> From: Philip Riggs <[EMAIL PROTECTED]>
> Subject: [R-sig-Geo] map algebra with ascii grid
> To: r-sig-geo@stat.math.ethz.ch
> Message-ID: <[EMAIL PROTECTED]>
>
ater
QScape Building, 80 Meiers Road, Indooroopilly Qld 4068
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Message: 1
Date: Sun, 15 Jul 2007 07:40:12 -0600
From: Philip Riggs <[EMAIL PROTECTED]>
Subject: [R-sig-Geo] map algebra with ascii grid
To: r-sig-geo@stat.ma
On 7/16/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
> On Sun, 15 Jul 2007, Tim Keitt wrote:
>
> > On 7/14/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
> >> On Sat, 14 Jul 2007, Michal Gallay wrote:
> >>
> >> > Dear R Users,
> >> >
> >> > could you please advise me on doing map algebra with spatia
On Sun, 15 Jul 2007, Tim Keitt wrote:
> On 7/14/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
>> On Sat, 14 Jul 2007, Michal Gallay wrote:
>>
>> > Dear R Users,
>> >
>> > could you please advise me on doing map algebra with spatial grids? It's
>> > the first time I am using spatial objects in
On 7/14/07, Roger Bivand <[EMAIL PROTECTED]> wrote:
> On Sat, 14 Jul 2007, Michal Gallay wrote:
>
> > Dear R Users,
> >
> > could you please advise me on doing map algebra with spatial grids? It's
> > the first time I am using spatial objects in R. I have imported an ascii
> > grid file and wanted
Agustin Lobo wrote:
> Roger,
>
> I think that having Arithmetic operations defined for
> SpatialGridDataFrame objects would be very useful.
The problem is that SpatialSomethingDataFrame objects don't inherit
data.frame's behaviour (with respect to mathematical operators). Perhaps
if R's OO i
Thank you very much to All ,
Roger's hint doest the thing I need. I am working with DEMs and instead of
processing them partially in a GIS, I wanted to do everything in R as most
of the analyses are carried out in R.
I'm sure I will have more questions in the future:) I appreciate all the
advi
Roger,
I think that having Arithmetic operations defined for
SpatialGridDataFrame objects would be very useful.
May be I'm missing something, but the argument that "columns of the data
frame (here a single column) may contain data of different classes" does
not seem a valid one to me, as
this i
>> Dear R Users,
>>
>> could you please advise me on doing map algebra with spatial
>> grids? It's
>> the first time I am using spatial objects in R. I have imported an
>> ascii
>> grid file and wanted to round the values in it or sum with a
>> value, but it
>> gives an error message:
>>
>>>
On Sat, 14 Jul 2007, Michal Gallay wrote:
> Dear R Users,
>
> could you please advise me on doing map algebra with spatial grids? It's
> the first time I am using spatial objects in R. I have imported an ascii
> grid file and wanted to round the values in it or sum with a value, but it
> gives an
Dear R Users,
could you please advise me on doing map algebra with spatial grids? It's
the first time I am using spatial objects in R. I have imported an ascii
grid file and wanted to round the values in it or sum with a value, but it
gives an error message:
>require(maptools)
>x <- readAsciiG
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