[R] Volume of polygon

[Sarah Goslee]

Hi,

As already mentioned, this is a great topic for R-sig-geo, where you'd
probably get specialist answers like the lake morphology package
https://cran.r-project.org/web/packages/lakemorpho/index.html which is
explicitly designed for this kind of question.

Sarah

On Tue, Dec 5, 2023 at 11:13 PM javad bayat <j.bayat194 using gmail.com> wrote:
>
>  Dear all;
> I am trying to calculate the volume of a polygon shapefile according to a
> DEM raster. I have provided some codes at the end of this email.I dont know
> if the codes are correct or not. Following this, I have another question
> too.
> I want to know if the volume of the reservoir rises or doubles, what would
> be the elevation?
> I would be more than happy if anyone could help me.
> Sincerely
>
> "
> library(raster)
> library(terra)
> library(exactextractr)
> library(dplyr)
> library(sf)
> r <- raster("Base.tif")
> p <- shapefile("p.shp")
> r <- crop(r, p)
> r <- mask(r, p)
> x <- exact_extract(r, p, coverage_area = TRUE)
>
> x1 = as.data.frame(x[1])
> head(x1)
> x1 = na.omit(x1)
>
> x1$Height = max(x1[,1]) - x1[,1]
>
> x1$Vol = x1[,2] * x1[,3]
>
> sum(x1$Vol)
>
> "
>
> --
> Best Regards
> Javad Bayat
> M.Sc. Environment Engineering
> Alternative Mail: bayat194 using yahoo.com
>
>         [[alternative HTML version deleted]]
>
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-- 
Sarah Goslee (she/her)
http://www.sarahgoslee.com