/
utm.py
130 lines (117 loc) · 4.57 KB
/
utm.py
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"""
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import re
import math
from qgis.core import QgsPointXY, QgsCoordinateReferenceSystem, QgsCoordinateTransform, QgsProject
from .util import epsg4326, tr
class UtmException(Exception):
pass
def utmParse(utm_str):
utm = utm_str.strip().upper()
m = re.match(r'(\d+)\s*([NS])\s+(\d+\.?\d*)\s+(\d+\.?\d*)', utm)
if m:
m = m.groups()
if len(m) == 4:
zone = int(m[0])
if zone < 1 or zone > 60:
raise UtmException(tr('Invalid UTM Coordinate'))
hemisphere = m[1]
if hemisphere != 'N' and hemisphere != 'S':
raise UtmException(tr('Invalid UTM Coordinate'))
easting = float(m[2])
northing = float(m[3])
return(zone, hemisphere, easting, northing)
m = re.match(r'(\d+\.?\d*)\s*,\s*(\d+\.?\d*)\s*,\s*(\d+)\s*([NS])', utm)
if m is None:
m = re.match(r'(\d+\.?\d*)\s*M\s*E\s*,\s*(\d+\.?\d*)\s*M\s*N\s*,\s*(\d+)\s*([NS])', utm)
if m is None:
m = re.match(r'(\d+\.?\d*)\s*M\s*E\s*,\s*(\d+\.?\d*)\s*M\s*N\s*,\s*(\d+)\s*,\s*([NS])', utm)
if m:
m = m.groups()
if len(m) == 4:
zone = int(m[2])
if zone < 1 or zone > 60:
raise UtmException(tr('Invalid UTM Coordinate'))
hemisphere = m[3]
if hemisphere != 'N' and hemisphere != 'S':
raise UtmException(tr('Invalid UTM Coordinate'))
easting = float(m[0])
northing = float(m[1])
return(zone, hemisphere, easting, northing)
raise UtmException('Invalid UTM Coordinate')
def utm2Point(utm, crs=epsg4326):
zone, hemisphere, easting, northing = utmParse(utm)
utmcrs = QgsCoordinateReferenceSystem(utmGetEpsg(hemisphere, zone))
pt = QgsPointXY(easting, northing)
utmtrans = QgsCoordinateTransform(utmcrs, crs, QgsProject.instance())
return(utmtrans.transform(pt))
def isUtm(utm):
try:
z, h, e, n = utmParse(utm)
except Exception:
return(False)
return(True)
def latLon2UtmZone(lat, lon):
if lon < -180 or lon > 360:
raise UtmException(tr('Invalid longitude'))
if lat > 84.5 or lat < -80.5:
raise UtmException(tr('Invalid latitude'))
if lon < 180:
zone = int(31 + (lon / 6.0))
else:
zone = int((lon / 6) - 29)
if zone > 60:
zone = 1
# Handle UTM special cases
if 56.0 <= lat < 64.0 and 3.0 <= lon < 12.0:
zone = 32
if 72.0 <= lat < 84.0:
if 0.0 <= lon < 9.0:
zone = 31
elif 9.0 <= lon < 21.0:
zone = 33
elif 21.0 <= lon < 33.0:
zone = 35
elif 33.0 <= lon < 42.0:
zone = 37
if lat < 0:
hemisphere = 'S'
else:
hemisphere = 'N'
return(zone, hemisphere)
def latLon2UtmParameters(lat, lon):
zone, hemisphere = latLon2UtmZone(lat, lon)
epsg = utmGetEpsg(hemisphere, zone)
utmcrs = QgsCoordinateReferenceSystem(epsg)
utmtrans = QgsCoordinateTransform(epsg4326, utmcrs, QgsProject.instance())
pt = QgsPointXY(lon, lat)
utmpt = utmtrans.transform(pt)
return(zone, hemisphere, utmpt.x(), utmpt.y())
def latLon2Utm(lat, lon, precision, format=0):
try:
zone, hemisphere, utmx, utmy = latLon2UtmParameters(lat, lon)
if format == 0:
msg = '{}{} {:.{prec}f} {:.{prec}f}'.format(zone, hemisphere, utmx, utmy, prec=precision)
elif format == 1:
msg = '{:.{prec}f},{:.{prec}f},{}{}'.format(utmx, utmy, zone, hemisphere, prec=precision)
elif format == 2:
msg = '{:.{prec}f}mE,{:.{prec}f}mN,{}{}'.format(utmx, utmy, zone, hemisphere, prec=precision)
else:
msg = '{:.{prec}f}mE,{:.{prec}f}mN,{},{}'.format(utmx, utmy, zone, hemisphere, prec=precision)
except Exception:
msg = ''
return(msg)
def utmGetEpsg(hemisphere, zone):
if hemisphere == 'N':
code = 32600 + zone
else:
code = 32700 + zone
return('EPSG:{}'.format(code))