Cropping field into small-plots using FieldImageR

[Tej Shahi]

Hi All:

Hope you all are doing well. I am new in FieldImageR and want to use it to split a field-image (multispectral)  into a small plot-images (using polygon shape) for further analysis with deep neural networks. I have attached an example image here with. Is there any specific function in FieldImageR?

The polygons are displayed in black box:

Many thanks in advances!

Regards

Tej

[Tej Shahi]

[fmatias]

Hi Tej,

I am not sure if it is what are you looking for but the function below was presented by Roberto Fritsche-Neto to clip images using each plot shape. 

#clipping raster by plots - a function

plot_clip <- function(ortho, shape){

  plot_raster <- list()

  for (i in 1:nrow(shape)) {

    cat("plot_", i, " ")

    p <- shape[i,]

    plot_raster[[i]] <- crop(x = ortho, y = extent(p))

    plot_raster[[i]] <- mask(plot_raster[[i]], p)

    names(plot_raster)[i] <- shape$plot[i]

  }

  return(plot_raster)

}

# clipping all seeds in single shots

rasterbyplots <- plot_clip(mosaic, ShapeFile)

Hope it helps...!!!

Best,

Filipe

[Tej Shahi]

Hi Filipe:

Thanks for code! it works for me.

Regards

Tej

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Tej Bahadur Shahi
Lecturer
Central Department of Computer Science and IT
Tribhuvan University, Kritipur
Kathmandu, Nepal
Mob: 9851176057
Office: 01-4332619