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"""
***************************************************************************
extractprojection.py
---------------------
Date : September 2013
Copyright : (C) 2013 by Alexander Bruy
Email : alexander dot bruy at gmail dot com
***************************************************************************
* *
* 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. *
* *
***************************************************************************
"""
__author__ = "Alexander Bruy"
__date__ = "September 2013"
__copyright__ = "(C) 2013, Alexander Bruy"
import os
from qgis.PyQt.QtGui import QIcon
from osgeo import gdal, osr
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from qgis.core import QgsProcessingException
from qgis.core import (
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBoolean,
QgsProcessingOutputFile,
)
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
gdal.UseExceptions()
osr.UseExceptions()
class ExtractProjection(GdalAlgorithm):
INPUT = "INPUT"
PRJ_FILE_CREATE = "PRJ_FILE_CREATE"
WORLD_FILE = "WORLD_FILE"
PRJ_FILE = "PRJ_FILE"
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterRasterLayer(self.INPUT, self.tr("Input file"))
)
self.addParameter(
QgsProcessingParameterBoolean(
self.PRJ_FILE_CREATE, self.tr("Create also .prj file"), False
)
)
self.addOutput(QgsProcessingOutputFile(self.WORLD_FILE, self.tr("World file")))
self.addOutput(
QgsProcessingOutputFile(self.PRJ_FILE, self.tr("ESRI Shapefile prj file"))
)
def name(self):
return "extractprojection"
def displayName(self):
return self.tr("Extract projection")
def icon(self):
return QIcon(
os.path.join(pluginPath, "images", "gdaltools", "projection-export.png")
)
def group(self):
return self.tr("Raster projections")
def groupId(self):
return "rasterprojections"
def commandName(self):
return "extractprojection"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
return [self.commandName()]
def processAlgorithm(self, parameters, context, feedback):
createPrj = self.parameterAsBoolean(parameters, self.PRJ_FILE_CREATE, context)
raster = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if raster.dataProvider().name() != "gdal":
raise QgsProcessingException(
self.tr("This algorithm can " "only be used with " "GDAL raster layers")
)
rasterPath = raster.source()
rasterDS = gdal.Open(rasterPath, gdal.GA_ReadOnly)
geotransform = rasterDS.GetGeoTransform()
inputcrs = raster.crs()
crs = inputcrs.toWkt()
raster = None
rasterDS = None
inFileName = os.path.splitext(str(rasterPath))
outFileName = inFileName[0]
# this is not a good idea as it won't work with an extension like .jpeg
# outFileExt = '.' + inFileName[1][1:4:2] + 'w'
if len(inFileName[1]) < 4:
outFileExt = ".wld"
else:
outFileExt = inFileName[1][0:2] + inFileName[1][-1] + "w"
results = {}
if crs != "" and createPrj:
tmp = osr.SpatialReference()
tmp.ImportFromWkt(crs)
tmp.MorphToESRI()
crs = tmp.ExportToWkt()
tmp = None
with open(outFileName + ".prj", "w", encoding="utf-8") as prj:
prj.write(crs)
results[self.PRJ_FILE] = outFileName + ".prj"
else:
results[self.PRJ_FILE] = None
with open(outFileName + outFileExt, "w") as wld:
wld.write("%0.8f\n" % geotransform[1])
wld.write("%0.8f\n" % geotransform[4])
wld.write("%0.8f\n" % geotransform[2])
wld.write("%0.8f\n" % geotransform[5])
wld.write(
"%0.8f\n"
% (geotransform[0] + 0.5 * geotransform[1] + 0.5 * geotransform[2])
)
wld.write(
"%0.8f\n"
% (geotransform[3] + 0.5 * geotransform[4] + 0.5 * geotransform[5])
)
results[self.WORLD_FILE] = outFileName + outFileExt
return results
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