Eesti Põhikaardi 1:10000 grid numbri arvutus

grid10T.py

# src: https://geoportaal.maaamet.ee/est/Andmed-ja-kaardid/Koordinaatsusteemid-ja-kaardilehtede-jaotused/Kaardilehtede-susteemid-p224.html

# consts for bounds  
xmin = 300000
xmax = 800000
square_x = 100000 # 1st level grid size
ymin = 6300000
ymax = 6700000
square_y = 100000
start1 = 4 # grid digit offsets
start2 = 1
start5 = 1

# input data, center of 53833 square
x = 532500
y = 6487500

xrel = x - xmin
yrel = y - ymin

grid10t = str((yrel//square_y) + start1) \
  + str((xrel//square_x) + start2) \
  + str(((yrel % square_y)//10000)) \
  + str(((xrel % square_x)//10000)) \
  + str(2 * ((yrel % square_y)//80000) + ((xrel % square_x)//80000) + start5)

print(grid10t)