Problem with rotation of the orthomosaic created in Agisoft

[Pedja]

Hello to all,

I have to repeat my question because I didn't solve my problem with the image rotation with the function fieldRotate.

The problem is when I try to rotate the image (which is in tiff format) I have bad results, plots are unnaturally distorted and shortened, because of that, I can't border individual plots in a good way with the function fieldShape.

The images are attached. 

The image is exported from the project created in the Agisoft program.

Does someone have a solution for this problem?

Best regards,

Pedja

[fmatias]

Hi Pedja,

Thanks for asking... Based on the images that you shared seems the alignment of your rows and columns is not straight. In other words, when you correct the rotation for columns (as the example shared) you are losing the alignment for the rows. 

The best approach to fix this problem is to align the field using the rows and drawing a shapefile for each row. For example following the command line below:

EX1<- mosaic # Your image

n.row<-16 # Number of rows

n.cols<-10 # Number of columns

EX1.Shape.1<-list()

for(i1 in 1:n.row){

  print(i1)

  EX1.Crop<- fieldCrop(mosaic = EX1) # Select and crop one row per time

  EX1.Shape.1[[i1]]<-fieldShape(mosaic = EX1.Crop, 

                                                     ncols = n.cols, # All columns 

                                                     nrows = 1 # Only 1 row per time

)}

EX1.Shape.2<-EX1.Shape.1[[1]]$fieldShape # Combining all partial shapefiles (rows) in one complete shapefile (full)

for(i2 in 2:n.row){

  EX1.Shape.2<-rbind(EX1.Shape.2,EX1.Shape.1[[i2]]$fieldShape)

}

plot(EX1.Shape.2) # Final shapefile

Hope it helps you.

Best,

Filipe