Re: R-sig-Geo Digest, Vol 182, Issue 13

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Re: R-sig-Geo Digest, Vol 182, Issue 13

Dadirai Matarira
I am doing NDVI time series analysis using MODIS data.I have produced my
map for NDVI trends.I produced five classes of the trends.
1.How do I calculate percentage areas for each category and the areas
represented by each category?
2.How do I determine area represented by my study area?

On Tue, Oct 30, 2018 at 1:02 PM <[hidden email]> wrote:

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>    1. Cost distance in spatial weight matrix (Roozbeh Valavi)
>    2. Re: Cost distance in spatial weight matrix
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> Message: 1
> Date: Mon, 29 Oct 2018 23:42:06 +1100
> From: Roozbeh Valavi <[hidden email]>
> To: [hidden email]
> Subject: [R-sig-Geo] Cost distance in spatial weight matrix
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> Dear list,
>
> I wonder if it is possible to add some kind of cost/weighting when creating
> a spatial weight matrix to be used in a spatial lag model? I want to
> consider the effect of elevation as a cost for calculating distance to the
> neighbours.
> I am using spdep for creating the W and splm for the model.
>
> Thank you in advance,
> Roozbeh
> --
> *Roozbeh Valavi*
> PhD Candidate
> The Quantitative & Applied Ecology Group <http://qaeco.com/>
> School of BioSciences | Faculty of Science
> The University of Melbourne, VIC 3010, Australia
> Mobile: +61 423 283 238
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> ------------------------------
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> Message: 2
> Date: Mon, 29 Oct 2018 14:48:43 +0100
> From: =?UTF-8?Q?Facundo_Mu=c3=b1oz?= <[hidden email]>
> To: [hidden email]
> Subject: Re: [R-sig-Geo] Cost distance in spatial weight matrix
> Message-ID: <[hidden email]>
> Content-Type: text/plain; charset="utf-8"
>
> Dear Roozbeh,
>
> package geoRcb [1]* provides function distmatGen() [2], which computes a
> cost-based distance matrix between any two sets of locations, given a
> raster cost surface (such as elevation). The function uses package
> gdistance to actually perform the computations, and it does not depend
> on anything else in the package, so you can simply copy it to your code
> base.
>
> Is that what you were looking for?
>
> Ć’acu.-
>
>
>
> [1] https://github.com/famuvie/geoRcb/
>
> [2] https://github.com/famuvie/geoRcb/blob/master/R/distmatGen.R
>
> * Disclaimer: I'm the author.
>
>
> On 10/29/18 1:42 PM, Roozbeh Valavi wrote:
> > Dear list,
> >
> > I wonder if it is possible to add some kind of cost/weighting when
> creating
> > a spatial weight matrix to be used in a spatial lag model? I want to
> > consider the effect of elevation as a cost for calculating distance to
> the
> > neighbours.
> > I am using spdep for creating the W and splm for the model.
> >
> > Thank you in advance,
> > Roozbeh
>
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>
>
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