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teren.py
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teren.py
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#-*- coding: utf-8 -*-
#-------------------------------------------------------------------------------
# Name: teren.py
# Purpose: digitalni model terenu, vypocet nadmorske vysky na zadanych
# souradnicich, vypocet profilu mezi dvema body, stanoveni
# max. vysky
#
# Author: Karel Psota
#
# Created: 28.04.2011
# Copyright: (c) Karel Psota 2011
# Licence: Simplified BSD License
#-------------------------------------------------------------------------------
import sys
import gdal
import numpy as np
import gdalconst
class Teren:
def __init__(self, soubor):
gdal.AllRegister()
self.raster = gdal.Open(soubor,gdalconst.GA_ReadOnly)
if self.raster != None:
transform = self.raster.GetGeoTransform()
self.radky = self.raster.RasterXSize
self.sloupce = self.raster.RasterYSize
self.raster_tlx = transform[0]
self.raster_tly = transform[3]
self.pixel_sirka = transform[1]
self.pixel_vyska = transform[5]
self.pixel_velikost = abs(self.pixel_sirka * self.pixel_vyska)
self.band = self.raster.GetRasterBand(1)
else:
print "Soubor s terenem neexistuje"
print "Program ukoncen"
sys.exit()
def get_z_bodu(self, x, y):
"vrati z-souradnici pro bod na souradnicich y,x"
try:
x_pixel = int((x - self.raster_tlx)/self.pixel_sirka)
y_pixel = int((y - self.raster_tly)/self.pixel_vyska)
data = self.band.ReadAsArray(x_pixel, y_pixel, 1, 1)
z = data[0, 0]
except:
z = -99
return z
def vypocti_vysky(self, refbody, zdroje):
"""vypocte profil vysek a urci maximalni vysku mezi i-tym zdrojem a
k-tym ref.bodem"""
raster_matice = self.band.ReadAsArray(0, 0, self.radky, self.sloupce)
max_vysky = []
profily = []
for z in zdroje:
x_z = getattr(z,"x")
y_z = getattr(z,"y")
profily_radek = []
max_vysky_radek = []
for r in refbody:
x_r = getattr(r,"x")
y_r = getattr(r,"y")
m_r = abs(int((self.raster_tly - y_r)/self.pixel_sirka))
n_r = abs(int((self.raster_tlx - x_r)/self.pixel_sirka))
m_z = abs(int((self.raster_tly - y_z)/self.pixel_sirka))
n_z = abs(int((self.raster_tlx - x_z)/self.pixel_sirka))
mn_r = [m_r,n_r]
mn_z = [m_z,n_z]
prvni_radek = min(mn_r[0], mn_z[0])
posledni_radek = max(mn_r[0], mn_z[0])
prvni_sloupec = min(mn_r[1], mn_z[1])
posledni_sloupec = max(mn_r[1], mn_z[1])
## vyber matici kde refbod a zdroj tvori krajni prvky
matice = []
for i in range(prvni_radek,posledni_radek+1):
matice_radek = []
for j in range(prvni_sloupec,posledni_sloupec+1):
matice_radek.append(raster_matice[i][j])
matice.append(matice_radek)
if ((prvni_radek == mn_r[0] and prvni_sloupec == mn_z[1])
or (prvni_radek == mn_z[0] and prvni_sloupec == mn_r[1])):
matice.reverse()
if m_r == m_z and n_r == n_z:
diag = [0]
elif abs(m_r - m_z) == 1 or abs(n_r - n_z) == 1:
diag = [0]
else:
# vypocti diagonalu
if len(matice) == len(matice[0]):
# ctvercova matice
diag = list(np.diag(matice))
# obdelnikove matice
elif len(matice) > len(matice[0]):
krok_vertik = int(round(float(len(matice))/len(matice[0])))
diag = self.diag_obdelnik_mn(matice,krok_vertik)
else:
krok_horiz = int(round(float(len(matice[0]))/len(matice)))
diag = self.diag_obdelnik_nm(matice,krok_horiz)
profily_radek.append(diag)
if len(diag)!= 1:
diag.pop(0)
diag.pop(len(diag)-1)
max_vyska = max(diag)
max_vysky_radek.append(max_vyska)
profily.append(profily_radek)
max_vysky.append(max_vysky_radek)
self.band = None
self.raster = None
return profily, max_vysky
def diag_obdelnik_mn(self,matice,krok_v):
"""vrati hodnoty na priblizne uhlopricce v obdelnikove matici,
kde je vyssi pocet radku nez sloupcu"""
diag = []
m = 0
for n in range(0,len(matice[0])):
for i in range(0,krok_v):
if len(matice)-m == 0:
break
else:
vyska = matice[m][n]
diag.append(vyska)
m += 1
return diag
def diag_obdelnik_nm(self,matice,krok_h):
"""vrati hodnoty na priblizne uhlopricce v obdelnikove matici,
kde je vyssi pocet sloupcu nez radku"""
diag = []
n = 0
for m in range(0,len(matice)):
for i in range(0,krok_h):
if len(matice[0])-n == 0:
break
else:
vyska = matice[m][n]
diag.append(vyska)
n += 1
return diag
def get_hrana_pixel(self):
return self.pixel_sirka
def main():
pass
if __name__ == '__main__':
main()