[RS-ecology] GEOGRAPHICAL COORDINATE S OF A PIXEL

[François Messner]

Hello,

I think you can use the function xyFromCell from raster package.
https://rdrr.io/cran/raster/man/xyFromCell.html

François Messner
Technicien en géomatique
Université du Maine - GREGUM UMR ESO
Tel: 02 43 83 31 80

Le 28/09/2018 13:24, Rop Willy a écrit :
> Hello,
>
> I have 2 questions to ask:
>
>
> 1. I have obtained a Landsat image and I want to carry out a 
> supervised classification and I have to collect validation data in the 
> field.How do I obtain the geographic coordinates for a particular 
> pixel? I've tried to use extract () and coordinates() function but 
> don't seem to get it. How can I, for example, get the geographic 
> coordinates of an upper right pixel in R?
>
> 2. More or less related to the above question, I've generated an NDVI 
> image in R. How do I get the NDVI value of a pixel located at certain 
> pixel coordinates? For example, pixel coordinate (200, 200)?
>
>
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