[R-sig-Geo] IDW for spatio-temporal temperature data- missing data in R

Dear all, I am new to R and coding in general, I have a time series (5 years daily data) data set from MODIS LST images with missing values due to cloud cover. I want to interpolate these missing values using IDW but I keep getting highly absurd results if I do not delete the missing values.On

Re: [R-sig-Geo] unsuscribe

On 26/01/17 00:01, Nicolas Fabre wrote: This is not the way you unsubscribe. See the list info (given at the bottom of every posting). cheers, Rolf Turner -- Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276

Re: [R-sig-Geo] Distance calculating between points according to a river network

Tristan, if I understand you right you just want to calculate the distances. So no hydro stuff like accumulation flow directions etc.? As well as no diffusion modeling of the pollutants. Most of the traditional vector based GIS stuff is packed into the rgeos package. So you might calculated

Re: [R-sig-Geo] Distance calculating between points according to a river network

The gdistance package in R is what you are looking for: https://cran.r-project.org/web/packages/gdistance/gdistance.pdf https://cran.r-project.org/web/packages/gdistance/vignettes/gdistance1.pdf Best, Jason On Wed, Jan 25, 2017 at 5:22 AM, Tristan Bourgeois < tristan.bourge...@gmail.com>

Re: [R-sig-Geo] Distance calculating between points according to a river network

Hi Mirza, Thanks for your quick answer. Actually I don't want to calculate distance between a point and the next downstream one. For example, if there are 4 sewage plant on a river and 7 measurment stations,I want the distance between each sewage plant and each station. (water pollution

Re: [R-sig-Geo] Distance calculating between points according to a river network

Dear Tristan, no R solution, but maybe a starting point: You can check out the Grass GIS tool v.net.distance (https://grass.osgeo.org/grass72/manuals/v.net.distance) what should help you. GRASS tools can also be integrated in R via the rgrass7 package. Good luck! Flo Am 25.01.2017 um

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Re: [R-sig-Geo] Distance calculating between points according to a river network

Hi Tristan, I recently had to do something similar (calculating distance to the next downstream point), and I was not able to find a solution with R that would deal with the direction of the flow. Perhaps someone who has deeper understanding of packages such as iGraph etc. might be able to find a

[R-sig-Geo] Distance calculating between points according to a river network

Hi, I'm a R new user and this is also my first post on this mailing list. I'm currently working on several project with R and I still have not found a solution for one : To be concise I'm working with shapefiles representing on a delimited area : - sewage plant (SpatialPointsDataFrame) - water

Re: [R-sig-Geo] shortestPath in a loop

Marta, your problem seems to me more conceptual. The shortestPath implementation of a cost analysis is not exactly want you want. You would choose it if you have to find an unknown path on a friction surface. You would not choose it if you just want to link positions. The shortestPath of your