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modification en projection mercator pour la latitude

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This commit is contained in:
laurent.deleers@gmail.com
2025-05-20 16:01:20 +00:00
parent 11b47b1549
commit c05ee25923
2 changed files with 39 additions and 17 deletions
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48
iface.py
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@@ -7,6 +7,7 @@ import os
import platform
import subprocess
import configparser
from math import log, tan, radians, pi, degrees, atan, sinh
from downloader import CopernicusDownloader
@@ -220,39 +221,58 @@ class MapSelector:
pass
def xy_from_latlon(self, lat, lon):
lat_min, lat_max = self.config.getfloat('map','map_lat_start'), self.config.getfloat('map','map_lat_end')
lon_min, lon_max = self.config.getfloat('map','map_lon_start'), self.config.getfloat('map','map_lon_end')
# print(f"xy_from_latlon dbg coord = {lat_min}-{lat_max}-{lon_min}-{lon_max}")
lat_min = self.config.getfloat('map', 'map_lat_start')
lat_max = self.config.getfloat('map', 'map_lat_end')
lon_min = self.config.getfloat('map', 'map_lon_start')
lon_max = self.config.getfloat('map', 'map_lon_end')
canvas_w = self.canvas.winfo_width()
canvas_h = self.canvas.winfo_height()
print(f"canvas = {canvas_w} {canvas_h} scale = {self.scale} offset = {self.offset_x} {self.offset_y} ")
print(f"canvas = {canvas_w} {canvas_h} scale = {self.scale} offset = {self.offset_x} {self.offset_y}")
x = (lon - lon_min) / (lon_max - lon_min) * self.scale * self.original_img.width + self.offset_x
y = (lat_max - lat) / (lat_max - lat_min) * self.scale * self.original_img.height + self.offset_y
# Longitude (linéaire)
x_norm = (lon - lon_min) / (lon_max - lon_min)
x = x_norm * self.scale * self.original_img.width + self.offset_x
print(f" xy_from_latlon : {x} - {y}")
# Latitude (projection Mercator)
mercator_min = log(tan(pi / 4 + radians(lat_min) / 2)) # Mercator
mercator_max = log(tan(pi / 4 + radians(lat_max) / 2)) # Mercator
mercator_lat = log(tan(pi / 4 + radians(lat) / 2)) # Mercator
y_norm = (mercator_max - mercator_lat) / (mercator_max - mercator_min)
y = y_norm * self.scale * self.original_img.height + self.offset_y
print(f"xy_from_latlon : {x} - {y}")
return x, y
def latlon_from_xy(self, x, y):
# Coordonnées géographiques de la carte
lat_min, lat_max = self.config.getfloat('map','map_lat_start'), self.config.getfloat('map','map_lat_end')
lon_min, lon_max = self.config.getfloat('map','map_lon_start'), self.config.getfloat('map','map_lon_end')
lat_min = self.config.getfloat('map', 'map_lat_start')
lat_max = self.config.getfloat('map', 'map_lat_end')
lon_min = self.config.getfloat('map', 'map_lon_start')
lon_max = self.config.getfloat('map', 'map_lon_end')
print(f"latlon_from_xy dbg coord = {lat_min}-{lat_max}-{lon_min}-{lon_max}")
# Calculer la position relative sur l'image
# Calculer la position relative dans l’image (sans offset/zoom)
img_x = (x - self.offset_x) / self.scale
img_y = (y - self.offset_y) / self.scale
# Vérifier si le clic est dans l'image affichée
if 0 <= img_x <= self.original_img.width and 0 <= img_y <= self.original_img.height:
rel_x = img_x / self.original_img.width
rel_y = img_y / self.original_img.height
lat = lat_max - rel_y * (lat_max - lat_min)
# Longitude : linéaire
lon = lon_min + rel_x * (lon_max - lon_min)
print(f" latlon_from_xy : {lat} - {lon}")
# Latitude : projection inverse de Mercator
merc_min = log(tan(pi / 4 + radians(lat_min) / 2)) # Mercator
merc_max = log(tan(pi / 4 + radians(lat_max) / 2)) # Mercator
merc_y = merc_max - rel_y * (merc_max - merc_min)
lat = degrees(atan(sinh(merc_y))) # Mercator Inverse
print(f"latlon_from_xy : {lat} - {lon}")
return lat, lon
else:
return None, None # En dehors de l'image

2
requirements.txt Normal file
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@@ -0,0 +1,2 @@
pillow
copernicusmarine