[RS-ecology] GEOGRAPHICAL COORDINATE S OF A PIXEL

[Rop Willy]

Cool, thanks!

On Fri, Sep 28, 2018, 15:48 François Messner <
francois.messner at univ-lemans.fr> wrote:

> 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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>
>
>
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