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VectorAT_MGIETRS89DirInv.py
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# -*- coding: utf-8 -*-
"""
***************************************************************************
VectorAT_MGIETRS89DirInv.py
---------------------
Date : August 2019
Copyright : (C) 2019 by Giovanni Manghi
Email : giovanni dot manghi at naturalgis dot pt
***************************************************************************
* *
* 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, Giovanni Manghi'
__date__ = 'August 2019'
__copyright__ = '(C) 2019, Giovanni Manghi'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
from urllib.request import urlretrieve
from qgis.PyQt.QtGui import QIcon
from qgis.core import (QgsProcessingException,
QgsProcessingParameterFeatureSource,
QgsProcessingParameterEnum,
QgsProcessingParameterVectorDestination
)
from processing.algs.gdal.GdalAlgorithm import GdalAlgorithm
from processing.algs.gdal.GdalUtils import GdalUtils
from ntv2_transformations.transformations import at_transformation
pluginPath = os.path.dirname(__file__)
class VectorAT_MGIETRS89DirInv(GdalAlgorithm):
INPUT = 'INPUT'
TRANSF = 'TRANSF'
CRS = 'CRS'
GRID = 'GRID'
OUTPUT = 'OUTPUT'
def __init__(self):
super().__init__()
def name(self):
return 'atvectortransform'
def displayName(self):
return '[AT] Direct and inverse Vector Transformation'
def group(self):
return '[AT] Austria'
def groupId(self):
return 'austria'
def tags(self):
return 'vector,grid,ntv2,direct,inverse,austria'.split(',')
def shortHelpString(self):
return 'Direct and inverse vector transformations using Austrian NTv2 grids.'
def icon(self):
return QIcon(os.path.join(pluginPath, 'icons', 'at.png'))
def initAlgorithm(self, config=None):
self.directions = ['Direct: Old Data -> ETRS89 [EPSG:4258]',
'Inverse: ETRS89 [EPSG:4258] -> Old Data'
]
self.datums = (('MGI [EPSG:4312]', 4312),
('MGI/Austria GK west [EPSG:31254]', 31254),
('MGI/Austria GK central [EPSG:31255]', 31255),
('MGI/Austria GK east [EPSG:31256]', 31256),
('MGI/Austria GK M28 [EPSG:31257]', 31257),
('MGI/Austria GK M31 [EPSG:31258]', 31258),
('MGI/Austria GK M34 [EPSG:31259]', 31259)
)
self.grids = (('AT_GIS_GRID', 'AT_GIS_GRID'),
)
self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
'Input vector'))
self.addParameter(QgsProcessingParameterEnum(self.TRANSF,
'Transformation',
options=self.directions,
defaultValue=0))
self.addParameter(QgsProcessingParameterEnum(self.CRS,
'Old Datum',
options=[i[0] for i in self.datums],
defaultValue=0))
self.addParameter(QgsProcessingParameterEnum(self.GRID,
'NTv2 Grid',
options=[i[0] for i in self.grids],
defaultValue=0))
self.addParameter(QgsProcessingParameterVectorDestination(self.OUTPUT,
'Output'))
def getConsoleCommands(self, parameters, context, feedback, executing=True):
ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
outFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, outFile)
output, outputFormat = GdalUtils.ogrConnectionStringAndFormat(outFile, context)
if outputFormat in ('SQLite', 'GPKG') and os.path.isfile(output):
raise QgsProcessingException('Output file "{}" already exists.'.format(output))
direction = self.parameterAsEnum(parameters, self.TRANSF, context)
epsg = self.datums[self.parameterAsEnum(parameters, self.CRS, context)][1]
grid = self.grids[self.parameterAsEnum(parameters, self.GRID, context)][1]
found, text = at_transformation(epsg, grid)
if not found:
raise QgsProcessingException(text)
arguments = []
if direction == 0:
# Direct transformation
arguments.append('-s_srs')
arguments.append(text)
arguments.append('-t_srs')
arguments.append('EPSG:4258')
arguments.append('-f {}'.format(outputFormat))
arguments.append('-lco')
arguments.append('ENCODING=UTF-8')
arguments.append(output)
arguments.append(ogrLayer)
arguments.append(layerName)
else:
# Inverse transformation
arguments.append('-s_srs')
arguments.append('EPSG:4258')
arguments.append('-t_srs')
arguments.append(text)
arguments.append('-f')
arguments.append('Geojson')
arguments.append('/vsistdout/')
arguments.append(ogrLayer)
arguments.append(layerName)
arguments.append('-lco')
arguments.append('ENCODING=UTF-8')
arguments.append('|')
arguments.append('ogr2ogr')
arguments.append('-f {}'.format(outputFormat))
arguments.append('-a_srs')
arguments.append('EPSG:4312')
arguments.append(output)
arguments.append('/vsistdin/')
gridFile = os.path.join(pluginPath, 'grids', 'AT_GIS_GRID.gsb')
if not os.path.isfile(gridFile):
urlretrieve('http://www.naturalgis.pt/downloads/ntv2grids/at/AT_GIS_GRID.gsb', gridFile)
return ['ogr2ogr', GdalUtils.escapeAndJoin(arguments)]