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create_subset_4sr.py
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# script for local processing of random tiles from the original dataset with awesome GDAL (https://gdal.org)
# only applicable for projected coordinate reference systems
from random import seed
from random import randint
# seed random number generator
seed(1)
# adapt your paths to your local system
path_original_img = "H:/opendemeurope/3035/data_countries/austria/all.tif"
out_high_res = "G:/subset/hr/"
out_low_res = "G:/subset/lr/"
out_upsampled_nn = "G:/subset/lr_us_nn/"
out_upsampled_cubic = "G:/subset/lr_us_cc/"
# adapt bbox of coordinates
xmin = 130000
xmax = 145000
ymin = 360000
ymax = 375000
# adapt size of image in meters
imagesize = 3000
# adapt size of pixel (resolution) in meters
pixel_size_high_res = 10
pixel_size_low_res = 30
ts_high_res = imagesize / pixel_size_high_res
ts_low_res = imagesize / pixel_size_low_res
# adapt number of images
num_images = 5
for i in range(num_images):
x_coord = randint(xmin, xmax - imagesize)
y_coord = randint(ymin, ymax - imagesize)
# high resolution images
print("gdalwarp -ts ", ts_high_res ," ", ts_high_res, " -te ",x_coord," ",y_coord," ", x_coord +imagesize, " ", y_coord + imagesize , " ", path_original_img ," ", out_high_res , x_coord,"_",y_coord,".tif",sep="")
# low resolution images
print("gdalwarp -ts ", ts_low_res ," ", ts_low_res, " -te ",x_coord," ",y_coord," ", x_coord +imagesize, " ", y_coord + imagesize , " ", path_original_img ," ", out_low_res , x_coord,"_",y_coord,".tif",sep="")
# upsampled images with next neighbor upsampling, default
print("gdalwarp -ts ", ts_high_res ," ", ts_high_res, " -te ",x_coord," ",y_coord," ", x_coord +imagesize, " ", y_coord + imagesize , " ", out_low_res , x_coord,"_",y_coord,".tif ", out_upsampled_nn , x_coord,"_",y_coord,".tif",sep="")
# upsampled images with cubic upsampling
print("gdalwarp -ts ", ts_high_res ," ", ts_high_res, " -te ",x_coord," ",y_coord," ", x_coord +imagesize, " ", y_coord + imagesize , " -r cubic ", out_low_res , x_coord,"_",y_coord,".tif ", out_upsampled_cubic , x_coord,"_",y_coord,".tif",sep="")