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Dear list, This might be interesting for you. I implemented an R function to automate download, mosaic, and projecting of MODIS images. In the following link you will find the instruction and details on how to use this function: http...

Dear list, I would like to introduce you an open-source tool which can be used to translate the STELLA model into R script. This script can be executed in R using deSolve package. This tool has been developed using...

Dear list, I'm trying to generate a 2-dimensional nonstationary field using GaussRF in RandomFields package. I have problem on how to define the covariance model. I tried to use the examples provided in the manual, but unfortunately I...

Hi Rolf, You right, Thank you. I replied to all by mistake. I intended to send the PDF to Chris. I removed the link. Cheers, Babak On Wed, Apr 8, 2020 at 2:00 AM Rolf Turner <r.turner at...

Dear list, I want to extract cell values from a raster object given row and column numbers or cell numbers. The solution I used is not efficient (see the following) comparing with extracting values from a matrix. Any advice? > m...

Dear Aidin, I tested your example with the latest version of raster package on R 2.12.2 (windows), got the same problem! But on R 2.13.0 (linux), and R 2.13.2 and 2.14 (windows), it...

Dear All, Hope you are safe and well! I am writing to inform you that the new R package, elsa, is released on CRAN. This package is a framework that provides the methods for quantifying the new local spatial statictic...

Dear List, This is to inform you that the 4th edition of the PhD/Postdoc course ?Species distributions models: concepts, methods, applications, and challenges? is organised by Prof. Miguel Ara?jo and Dr. Babak Naimi in University of Evora, Portugal...

There are several packages available in R to do ecological niche modelling. One easy-to-use option would be the sdm package. It is a comprehensive modelling and simulation framework to fit species distribution models supports several algorithms, and also...

Hi Chris, Thanks for your email. Unfortunately, the article is not open but you can find the PDF from the following link: https://www.dropbox.com/s/mpjra60b5yyzwjg/Naimi_2019_ELSA.pdf?dl=0 Best regards, Babak On Wed, Apr...

Dear Thiago, I checked your command, and it works fine. As Steve said, your RCurl might be old. However, I changed that line based on Matteo's suggestion, to avoid the server connection error, and new version is uploaded on...

Hi, It suggests you do not have the required packages for those methods on your machine. You can first simply run the following code and then try yours: sdm::installAll() Hope this helps, Best wishes, Babak On Tue, Jun 29...

Dear Robert, Thanks. It is great. The only thing you may like to include in the functions is the neighbourhood size. So they can be like the below: MoranLocal <- function(x,ngb=3) { n <- ncell(x) - cellStats(x, 'countNA') s2...

Dear Robert and Roger, Thank both of you. After all, I came up with the following function (focalMoran) that efficiently works. I tested it for a raster layer with 122345 not-NA cells, and compared with locmor (based on localmoran...

Dear list, I need a dataset (preferably a raster) that has a negative spatial autocorrelation. I just used an arbitrary procedure to simulate a simple one, but I think it is not realistic at all. The procedure I used: I...

Dear Robert, Thanks for your reply. Now, the result is the same as with localmoran in spdep package. But I checked this with Getis & Ord (1996), seems the formula, as you implement in the script, is not the same as...

Dear Matteo, Thanks for your nice package. Actually, I was not aware of this package. I think the ModisDownload and getHDF functions work almost the same since in both you can select a range of tiles and dates for required...

Hi Juliann, You can use lisa function in usdm package which I implemented for calculating some of local statistics including local Gi* for raster data. Hope this would help. Cheers, Babak ---------------------------------------------------------------------- Message: 1 Date: Sun, 10 Mar 2013 11:48...

Hi, If by nan you mean NA pixels, the pixels with NA would not contribute to the calculation so would not cause any problem for the calculation. On Thu, Oct 21, 2021 at 12:44 PM Gabriel Cotlier <gabiklm01 at...

Dear All, I'm trying to calculate Local Moran's I for each grid cell in a raster given a distance (d1,d2) within which the neighbour cells are identified. I wrote a function which uses localmoran of spdep package...