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convertGroundOverlays.py
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convertGroundOverlays.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
* *
* 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 os
from qgis.PyQt.QtCore import QObject, QVariant, QCoreApplication, QUrl, pyqtSignal
from qgis.PyQt.QtGui import QIcon
from qgis import processing
from qgis.core import (
QgsCoordinateReferenceSystem, QgsPointXY, QgsRasterLayer, QgsProject,
QgsLineString, QgsMultiLineString, QgsPolygon, QgsMultiPolygon,
QgsFeature, QgsGeometry, QgsFields, QgsField, QgsWkbTypes)
from qgis.core import (
QgsProcessingAlgorithm,
QgsProcessingParameterFile,
QgsProcessingParameterBoolean,
QgsProcessingException,
QgsProcessingParameterFolderDestination)
from zipfile import ZipFile
import xml.sax
import xml.sax.handler
import traceback
epsg4326 = QgsCoordinateReferenceSystem("EPSG:4326")
def tr(string):
return QCoreApplication.translate('Processing', string)
class ConvertGroundOverlayAlgorithm(QgsProcessingAlgorithm):
"""
Algorithm to import KML and KMZ files.
"""
PrmInput = 'Input'
PrmGroundOverlayFolder = 'GroundOverlayFolder'
PrmLoadGeoTiffs = 'LoadGeoTiffs'
def initAlgorithm(self, config):
self.addParameter(
QgsProcessingParameterFile(
self.PrmInput,
tr('Input KML/KMZ file'))
)
self.addParameter(
QgsProcessingParameterFolderDestination(
self.PrmGroundOverlayFolder,
tr('Output folder for KML/KMZ Ground Overlay Images'),
optional=False)
)
self.addParameter(
QgsProcessingParameterBoolean(
self.PrmLoadGeoTiffs,
'Automatically load converted GeoTIFFs into QGIS',
True,
optional=True)
)
def processAlgorithm(self, parameters, context, feedback):
self.parameters = parameters
self.context = context
self.feedback = feedback
load_geotiffs = self.parameterAsInt(parameters, self.PrmLoadGeoTiffs, context)
out_folder = self.parameterAsFile(parameters, self.PrmGroundOverlayFolder, context)
input_file = self.parameterAsFile(parameters, self.PrmInput, context)
f, extension = os.path.splitext(input_file)
dirname = os.path.dirname(input_file)
extension = extension.lower()
try:
if extension == '.kmz':
kmz = ZipFile(input_file, 'r')
kml = kmz.open('doc.kml', 'r')
elif extension == '.kml':
kml = open(input_file, encoding="utf-8", errors="backslashreplace")
else:
msg = "Invalid extension: Should be kml or kmz"
raise QgsProcessingException(msg)
except Exception:
msg = "Failed to open file"
raise QgsProcessingException(msg)
parser = xml.sax.make_parser()
self.overlays = []
# Set up the handler for doing the main processing
handler = GroundOverlayHandler(feedback)
handler.groundoverlay.connect(self.groundoverlay)
parser.setContentHandler(handler)
try:
input_source = xml.sax.xmlreader.InputSource()
input_source.setByteStream(kml)
input_source.setEncoding('utf-8')
parser.parse(input_source)
except Exception:
'''s = traceback.format_exc()
feedback.pushInfo(s)'''
feedback.reportError(tr('Failure in kml extraction - May return partial results.'))
handler.endDocument()
self.namelist = set()
# Iterate through each found overlay images
for overlay in self.overlays:
if feedback.isCanceled():
break
north = overlay[0]
south = overlay[1]
east = overlay[2]
west = overlay[3]
rotation = overlay[4]
href = overlay[5]
if href.startswith('http:') or href.startswith('https:'):
feedback.reportError('Cannot process network images: {}'.format(href))
continue
if extension == '.kmz':
try:
image = kmz.read(href)
output_file = os.path.basename(href)
# Could use this method to prevent multiple names overwriting each other
# Could be problematic if these are abloslute path filenames on the computer
# (out_dir, output_file) = os.path.split(href)
# '_'.join(out_dir.replace('\\', '/').split('/'))
file_name, ext = os.path.splitext(output_file)
# Write out a temporary image
temp_file_name = os.path.join(out_folder,'{}_temp{}'.format(file_name, ext))
fp = open(temp_file_name, "wb")
fp.write(image)
fp.close()
raster = QgsRasterLayer(temp_file_name, "temp")
except Exception:
feedback.reportError('Image does not exist: {}'.format(href))
continue
else:
# Check to see if it is a valid file name
in_path = os.path.join(dirname, href)
if not os.path.isfile(in_path):
# The path was not valid
feedback.reportError('Image file does not exist: {}'.format(in_path))
continue
raster = QgsRasterLayer(in_path, "temp")
output_file = os.path.basename(in_path)
file_name, ext = os.path.splitext(output_file)
if not raster.isValid():
feedback.reportError('Invalid raster image: {}'.format(href))
continue
# Make sure the name is unique so the images are not overwritten
file_name = self.uniqueName(file_name)
out_path = os.path.join(out_folder, file_name+".tif")
if rotation == 0:
status = processing.run("gdal:translate", {'INPUT': raster,
'EXTRA': '-a_srs EPSG:4326 -a_ullr {} {} {} {}'.format(west, north, east, south),
'DATA_TYPE': 0,
'OUTPUT': out_path})
else:
rwidth = raster.width()
rheight = raster.height()
center_x = (east + west) / 2.0
center_y = (north + south)/ 2.0
center_pt = QgsPointXY(center_x, center_y)
ul_pt = QgsPointXY(west, north)
ur_pt = QgsPointXY(east, north)
lr_pt = QgsPointXY(east, south)
ll_pt = QgsPointXY(west, south)
distance = center_pt.distance(ul_pt)
az = center_pt.azimuth(ul_pt) - rotation
pt1 = center_pt.project(distance, az)
az = center_pt.azimuth(ur_pt) - rotation
pt2 = center_pt.project(distance, az)
az = center_pt.azimuth(lr_pt) - rotation
pt3 = center_pt.project(distance, az)
az = center_pt.azimuth(ll_pt) - rotation
pt4 = center_pt.project(distance, az)
gcp1= '-gcp {} {} {} {}'.format(0,0, pt1.x(), pt1.y())
gcp2= '-gcp {} {} {} {}'.format(rwidth,0, pt2.x(), pt2.y())
gcp3= '-gcp {} {} {} {}'.format(rwidth, rheight, pt3.x(), pt3.y())
gcp4= '-gcp {} {} {} {}'.format(0, rheight, pt4.x(), pt4.y())
status = processing.run("gdal:translate", {'INPUT': raster,
'EXTRA': '-a_srs EPSG:4326 -a_nodata 0,0,0 {} {} {} {}'.format(gcp1, gcp2, gcp3, gcp4),
'DATA_TYPE': 0,
'OUTPUT': out_path})
if load_geotiffs:
context.addLayerToLoadOnCompletion(
out_path,
context.LayerDetails(
file_name,
project=context.project()
))
del raster
if extension == '.kmz':
try:
os.remove(temp_file_name)
os.remove(temp_file_name+'.aux.xml')
except Exception:
pass
if extension == '.kmz':
kmz.close()
else:
kml.close()
# self.feedback.pushInfo('Number of overlays: {}'.format(len(self.overlays)))
return ({})
def uniqueName(self, name):
index = 1
n = name
while n in self.namelist:
n = '{}_{}'.format(name, index)
index += 1
# Keep track of all of the used names
self.namelist.add(n)
return (n)
def groundoverlay(self, north, south, east, west, rotation, href):
# self.feedback.pushInfo('In groundoverlay')
try:
if north:
north = float(north)
else:
north = 0.0
if south:
south = float(south)
else:
south = 0.0
if east:
east = float(east)
else:
east = 0.0
if west:
west = float(west)
else:
west = 0.0
if rotation:
rotation = float(rotation)
else:
rotation = 0.0
self.overlays.append([north, south, east, west, rotation, href])
except Exception:
'''s = traceback.format_exc()
feedback.pushInfo(s)'''
pass
def name(self):
return 'extractgroundoverlays'
def icon(self):
return QIcon(os.path.dirname(__file__) + '/icons/gnd_overlay_import.svg')
def displayName(self):
return tr('Extract KML/KMZ Ground Overlays')
def group(self):
return tr('Raster conversion')
def groupId(self):
return 'rasterconversion'
def helpUrl(self):
file = os.path.dirname(__file__) + '/index.html'
if not os.path.exists(file):
return ''
return QUrl.fromLocalFile(file).toString(QUrl.FullyEncoded)
def shortHelpString(self):
file = os.path.dirname(__file__) + '/doc/extractgndoverlays.help'
if not os.path.exists(file):
return ''
with open(file) as helpf:
help = helpf.read()
return help
def createInstance(self):
return ConvertGroundOverlayAlgorithm()
class GroundOverlayHandler(xml.sax.handler.ContentHandler, QObject):
groundoverlay = pyqtSignal(str, str, str, str, str, str)
def __init__(self, feedback):
QObject.__init__(self)
xml.sax.handler.ContentHandler.__init__(self)
self.schema = {}
self.feedback = feedback
self.resetSettings()
def resetSettings(self):
'''Set all settings to a default new placemark.'''
self.inGroundOverlay = False
self.inNorth = False
self.inSouth = False
self.inEast = False
self.inWest = False
self.inRotation = False
self.inHref = False
self.north = ""
self.south = ""
self.east = ""
self.west = ""
self.rotation = ""
self.href = ""
def startElement(self, name, attr):
if name.startswith('kml:'):
name = name[4:]
if name == "GroundOverlay":
self.inGroundOverlay = True
elif self.inGroundOverlay:
if name == "north":
self.inNorth = True
self.north = ""
elif name == "south":
self.inSouth = True
self.south = ""
elif name == "east":
self.inEast = True
self.east = ""
elif name == "west":
self.inWest = True
self.west = ""
elif name == "rotation":
self.inRotation = True
self.rotation = ""
elif name == "href":
self.inHref = True
self.href = ""
def characters(self, data):
if self.inNorth: # on text within tag
self.north += data
elif self.inSouth:
self.south += data
elif self.inEast:
self.east += data
elif self.inWest:
self.west += data
elif self.inRotation:
self.rotation += data
elif self.inHref:
self.href += data
def endElement(self, name):
if name.startswith('kml:'):
name = name[4:]
if self.inGroundOverlay:
if name == "north":
self.inNorth = False # on end title tag
self.north = self.north.strip()
elif name == "south":
self.inSouth = False
self.south = self.south.strip()
elif name == "east":
self.inEast = False
self.east = self.east.strip()
elif name == "west":
self.inWest = False
self.west = self.west.strip()
elif name == "rotation":
self.inRotation = False
self.rotation = self.rotation.strip()
elif name == "href":
self.inHref = False
self.href = self.href.strip()
elif name == 'GroundOverlay':
self.inGroundOverlay = False
self.groundoverlay.emit(self.north, self.south, self.east, self.west, self.rotation, self.href)