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"""
***************************************************************************
viewshed.py
---------------------
Date : October 2019
Copyright : (C) 2019 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__ = "October 2019"
__copyright__ = "(C) 2019, Alexander Bruy"
import os
from qgis.core import (
QgsRasterFileWriter,
QgsProcessingException,
QgsProcessingParameterDefinition,
QgsProcessingParameterRasterLayer,
QgsProcessingParameterBand,
QgsProcessingParameterPoint,
QgsProcessingParameterNumber,
QgsProcessingParameterDistance,
QgsProcessingParameterString,
QgsProcessingParameterRasterDestination,
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
class viewshed(GdalAlgorithm):
INPUT = "INPUT"
BAND = "BAND"
OBSERVER = "OBSERVER"
OBSERVER_HEIGHT = "OBSERVER_HEIGHT"
TARGET_HEIGHT = "TARGET_HEIGHT"
MAX_DISTANCE = "MAX_DISTANCE"
OPTIONS = "OPTIONS"
EXTRA = "EXTRA"
OUTPUT = "OUTPUT"
def __init__(self):
super().__init__()
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterRasterLayer(self.INPUT, self.tr("Input layer"))
)
self.addParameter(
QgsProcessingParameterBand(
self.BAND,
self.tr("Band number"),
1,
parentLayerParameterName=self.INPUT,
)
)
self.addParameter(
QgsProcessingParameterPoint(self.OBSERVER, self.tr("Observer location"))
)
self.addParameter(
QgsProcessingParameterNumber(
self.OBSERVER_HEIGHT,
self.tr("Observer height, DEM units"),
type=QgsProcessingParameterNumber.Type.Double,
minValue=0.0,
defaultValue=1.0,
)
)
self.addParameter(
QgsProcessingParameterNumber(
self.TARGET_HEIGHT,
self.tr("Target height, DEM units"),
type=QgsProcessingParameterNumber.Type.Double,
minValue=0.0,
defaultValue=1.0,
)
)
self.addParameter(
QgsProcessingParameterDistance(
self.MAX_DISTANCE,
self.tr("Maximum distance from observer to compute visibility"),
parentParameterName=self.INPUT,
minValue=0.0,
defaultValue=100.0,
)
)
options_param = QgsProcessingParameterString(
self.OPTIONS,
self.tr("Additional creation options"),
defaultValue="",
optional=True,
)
options_param.setFlags(
options_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
)
options_param.setMetadata({"widget_wrapper": {"widget_type": "rasteroptions"}})
self.addParameter(options_param)
extra_param = QgsProcessingParameterString(
self.EXTRA,
self.tr("Additional command-line parameters"),
defaultValue=None,
optional=True,
)
extra_param.setFlags(
extra_param.flags() | QgsProcessingParameterDefinition.Flag.FlagAdvanced
)
self.addParameter(extra_param)
self.addParameter(
QgsProcessingParameterRasterDestination(self.OUTPUT, self.tr("Output"))
)
def name(self):
return "viewshed"
def displayName(self):
return self.tr("Viewshed")
def group(self):
return self.tr("Raster miscellaneous")
def groupId(self):
return "rastermiscellaneous"
def commandName(self):
return "gdal_viewshed"
def getConsoleCommands(self, parameters, context, feedback, executing=True):
dem = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if dem is None:
raise QgsProcessingException(
self.invalidRasterError(parameters, self.INPUT)
)
dem_input_details = GdalUtils.gdal_connection_details_from_layer(dem)
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, out)
observer = self.parameterAsPoint(parameters, self.OBSERVER, context, dem.crs())
arguments = [
"-b",
f"{self.parameterAsInt(parameters, self.BAND, context)}",
"-ox",
f"{observer.x()}",
"-oy",
f"{observer.y()}",
"-oz",
f"{self.parameterAsDouble(parameters, self.OBSERVER_HEIGHT, context)}",
"-tz",
f"{self.parameterAsDouble(parameters, self.TARGET_HEIGHT, context)}",
"-md",
f"{self.parameterAsDouble(parameters, self.MAX_DISTANCE, context)}",
"-f",
QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]),
]
options = self.parameterAsString(parameters, self.OPTIONS, context)
if options:
arguments.extend(GdalUtils.parseCreationOptions(options))
if self.EXTRA in parameters and parameters[self.EXTRA] not in (None, ""):
extra = self.parameterAsString(parameters, self.EXTRA, context)
arguments.append(extra)
arguments.append(dem_input_details.connection_string)
arguments.append(out)
if dem_input_details.credential_options:
arguments.extend(dem_input_details.credential_options_as_arguments())
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
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