本文整理汇总了Python中qgis.core.QgsCoordinateReferenceSystem.createFromOgcWmsCrs方法的典型用法代码示例。如果您正苦于以下问题：Python QgsCoordinateReferenceSystem.createFromOgcWmsCrs方法的具体用法？Python QgsCoordinateReferenceSystem.createFromOgcWmsCrs怎么用？Python QgsCoordinateReferenceSystem.createFromOgcWmsCrs使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsCoordinateReferenceSystem的用法示例。
在下文中一共展示了QgsCoordinateReferenceSystem.createFromOgcWmsCrs方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: _calc_north
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import createFromOgcWmsCrs [as 别名]
def _calc_north(self):
extent = self.canvas.extent()
if self.canvas.layerCount() == 0 or extent.isEmpty():
print "No layers or extent"
return 0
outcrs = self.canvas.mapSettings().destinationCrs()
if outcrs.isValid() and not outcrs.geographicFlag():
crs = QgsCoordinateReferenceSystem()
crs.createFromOgcWmsCrs("EPSG:4326")
transform = QgsCoordinateTransform(outcrs, crs)
p1 = QgsPoint(extent.center())
p2 = QgsPoint(p1.x(), p1.y() + extent.height() * 0.25)
try:
pp1 = transform.transform(p1)
pp2 = transform.transform(p2)
except QgsCsException:
roam.utils.warning("North arrow. Error transforming.")
return None
area = QgsDistanceArea()
area.setEllipsoid(crs.ellipsoidAcronym())
area.setEllipsoidalMode(True)
area.setSourceCrs(crs)
distance, angle, _ = area.computeDistanceBearing(pp1, pp2)
angle = math.degrees(angle)
return angle
else:
return 0示例2: coordRefSys
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import createFromOgcWmsCrs [as 别名]
def coordRefSys(self, mapCoordSys):
epsg = self.epsgList[0] # TODO: look for matching coord
coordRefSys = QgsCoordinateReferenceSystem()
createCrs = coordRefSys.createFromOgcWmsCrs("EPSG:%d" % epsg)
if not createCrs:
return None
return coordRefSys示例3: coordRefSys
# 需要导入模块: from qgis.core import QgsCoordinateReferenceSystem [as 别名]
# 或者: from qgis.core.QgsCoordinateReferenceSystem import createFromOgcWmsCrs [as 别名]
def coordRefSys(self, mapCoordSys):
epsg = self.epsgList[0]
coordRefSys = QgsCoordinateReferenceSystem()
if QGis.QGIS_VERSION_INT >= 10900:
idEpsgRSGoogle = "EPSG:%d" % epsg
createCrs = coordRefSys.createFromOgcWmsCrs(idEpsgRSGoogle)
else:
idEpsgRSGoogle = epsg
createCrs = coordRefSys.createFromEpsg(idEpsgRSGoogle)
if not createCrs:
proj_def = "+proj=tmerc +lat_0=38 +lon_0=127.5 +k=0.9996 +x_0=1000000 +y_0=2000000 +ellps=GRS80 "
proj_def += "+towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
isOk = coordRefSys.createFromProj4(proj_def)
if not isOk:
return None
return coordRefSys