本文整理汇总了Python中qgis.core.QgsRasterFileWriter类的典型用法代码示例。如果您正苦于以下问题:Python QgsRasterFileWriter类的具体用法?Python QgsRasterFileWriter怎么用?Python QgsRasterFileWriter使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了QgsRasterFileWriter类的15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: read_from_qgis_native
def read_from_qgis_native(self, qgis_layer):
"""Read raster data from qgis layer QgsRasterLayer.
A stub is used now:
save all data in a file,
then call safe.read_from_file
Raises:
* TypeError if qgis is not avialable
* IOError if can't store temporary file
* GetDataError if can't create copy of qgis_layer's
dataProvider
"""
base_name = unique_filename()
file_name = base_name + '.tif'
file_writer = QgsRasterFileWriter(file_name)
pipe = QgsRasterPipe()
provider = qgis_layer.dataProvider()
if not pipe.set(provider.clone()):
msg = "Cannot set pipe provider"
raise GetDataError(msg)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
# Write keywords if any
write_keywords(self.keywords, base_name + '.keywords')
self.read_from_file(file_name)
示例2: clip_raster
def clip_raster(raster, column_count, row_count, output_extent):
"""Clip raster to specified extent, width and height.
Note there is similar utility in safe_qgis.utilities.clipper, but it uses
gdal whereas this one uses native QGIS.
:param raster: Raster
:type raster: QgsRasterLayer
:param column_count: Desired width in pixels of new raster
:type column_count: Int
:param row_count: Desired height in pixels of new raster
:type row_count: Int
:param output_extent: Extent of the clipped region
:type output_extent: QgsRectangle
:returns: Clipped region of the raster
:rtype: QgsRasterLayer
"""
provider = raster.dataProvider()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
base_name = unique_filename()
file_name = base_name + ".tif"
file_writer = QgsRasterFileWriter(file_name)
file_writer.writeRaster(pipe, column_count, row_count, output_extent, raster.crs())
return QgsRasterLayer(file_name, "clipped_raster")
示例3: raster_to_file
def raster_to_file(self, layer, filename):
'''
write the contents of the raster-layer to a file (tif)
'''
extent = layer.extent()
width, height = layer.width(), layer.height()
pipe = QgsRasterPipe()
# setting renderer leads to export as rendered image (strange: causes conversion from grayscale to multicolor with 4 bands)
# else raw data is written (in grayscale)
#renderer = layer.renderer()
provider = layer.dataProvider()
#pipe.set(renderer.clone())
pipe.set(provider.clone())
# another possible way to pipe (take the referenced one), references the renderer as well
# -> causes wrong color bands while exporting (see some lines above)
#pipe = layer.pipe()
file_writer = QgsRasterFileWriter(filename)
file_writer.writeRaster(pipe,
width,
height,
extent,
layer.crs())
示例4: _add_raster_layer
def _add_raster_layer(self, raster_layer, layer_name, save_style=False):
"""Add a raster layer to the folder.
:param raster_layer: The layer to add.
:type raster_layer: QgsRasterLayer
:param layer_name: The name of the layer in the datastore.
:type layer_name: str
:param save_style: If we have to save a QML too. Default to False.
:type save_style: bool
:returns: A two-tuple. The first element will be True if we could add
the layer to the datastore. The second element will be the layer
name which has been used or the error message.
:rtype: (bool, str)
.. versionadded:: 4.0
"""
if not self.is_writable():
return False, 'The destination is not writable.'
output = QFileInfo(self.uri.filePath(layer_name + '.tif'))
source = QFileInfo(raster_layer.source())
if source.exists() and source.suffix() in ['tiff', 'tif']:
# If it's tiff file based.
QFile.copy(source.absoluteFilePath(), output.absoluteFilePath())
else:
# If it's not file based.
renderer = raster_layer.renderer()
provider = raster_layer.dataProvider()
crs = raster_layer.crs()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
pipe.set(renderer.clone())
file_writer = QgsRasterFileWriter(output.absoluteFilePath())
file_writer.Mode(1)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
crs)
del file_writer
if save_style:
style_path = QFileInfo(self.uri.filePath(layer_name + '.qml'))
raster_layer.saveNamedStyle(style_path.absoluteFilePath())
assert output.exists()
return True, output.baseName()
示例5: testDriverForExtension
def testDriverForExtension(self):
self.assertEqual(QgsRasterFileWriter.driverForExtension('tif'), 'GTiff')
self.assertEqual(QgsRasterFileWriter.driverForExtension('TIF'), 'GTiff')
self.assertEqual(QgsRasterFileWriter.driverForExtension('tIf'), 'GTiff')
self.assertEqual(QgsRasterFileWriter.driverForExtension('.tif'), 'GTiff')
self.assertEqual(QgsRasterFileWriter.driverForExtension('img'), 'HFA')
self.assertEqual(QgsRasterFileWriter.driverForExtension('.vrt'), 'VRT')
self.assertEqual(QgsRasterFileWriter.driverForExtension('.jpg'), 'JPEG')
self.assertEqual(QgsRasterFileWriter.driverForExtension('asc'), 'AAIGrid')
self.assertEqual(QgsRasterFileWriter.driverForExtension('not a format'), '')
self.assertEqual(QgsRasterFileWriter.driverForExtension(''), '')
示例6: getFileFilter
def getFileFilter(param):
"""
Returns a suitable file filter pattern for the specified parameter definition
:param param:
:return:
"""
if param.type() == 'layer':
vectors = QgsProviderRegistry.instance().fileVectorFilters().split(';;')
vectors.pop(0)
rasters = QgsProviderRegistry.instance().fileRasterFilters().split(';;')
rasters.pop(0)
filters = set(vectors + rasters)
filters = sorted(filters)
return tr('All files (*.*)') + ';;' + ";;".join(filters)
elif param.type() == 'multilayer':
if param.layerType() == QgsProcessing.TypeRaster:
exts = QgsRasterFileWriter.supportedFormatExtensions()
elif param.layerType() == QgsProcessing.TypeFile:
return tr('All files (*.*)', 'QgsProcessingParameterMultipleLayers')
else:
exts = QgsVectorFileWriter.supportedFormatExtensions()
for i in range(len(exts)):
exts[i] = tr('{0} files (*.{1})', 'QgsProcessingParameterMultipleLayers').format(exts[i].upper(), exts[i].lower())
return tr('All files (*.*)') + ';;' + ';;'.join(exts)
elif param.type() == 'raster':
return QgsProviderRegistry.instance().fileRasterFilters()
elif param.type() == 'rasterDestination':
if param.provider() is not None:
exts = param.provider().supportedOutputRasterLayerExtensions()
else:
exts = QgsRasterFileWriter.supportedFormatExtensions()
for i in range(len(exts)):
exts[i] = tr('{0} files (*.{1})', 'ParameterRaster').format(exts[i].upper(), exts[i].lower())
return ';;'.join(exts) + ';;' + tr('All files (*.*)')
elif param.type() in ('sink', 'vectorDestination'):
if param.provider() is not None:
exts = param.provider().supportedOutputVectorLayerExtensions()
else:
exts = QgsVectorFileWriter.supportedFormatExtensions()
for i in range(len(exts)):
exts[i] = tr('{0} files (*.{1})', 'ParameterVector').format(exts[i].upper(), exts[i].lower())
return ';;'.join(exts) + ';;' + tr('All files (*.*)')
elif param.type() == 'source':
return QgsProviderRegistry.instance().fileVectorFilters()
elif param.type() == 'vector':
return QgsProviderRegistry.instance().fileVectorFilters()
elif param.type() == 'fileDestination':
return param.fileFilter() + ';;' + tr('All files (*.*)')
if param.defaultFileExtension():
return tr('Default extension') + ' (*.' + param.defaultFileExtension() + ')'
else:
return ''
示例7: testSupportedFiltersAndFormat
def testSupportedFiltersAndFormat(self):
# test with formats in recommended order
formats = QgsRasterFileWriter.supportedFiltersAndFormats(QgsRasterFileWriter.SortRecommended)
self.assertEqual(formats[0].filterString, 'GeoTIFF (*.tif *.TIF *.tiff *.TIFF)')
self.assertEqual(formats[0].driverName, 'GTiff')
self.assertTrue('netCDF' in [f.driverName for f in formats])
# alphabetical sorting
formats2 = QgsRasterFileWriter.supportedFiltersAndFormats(QgsRasterFileWriter.RasterFormatOptions())
self.assertTrue(formats2[0].driverName < formats2[1].driverName)
self.assertCountEqual([f.driverName for f in formats], [f.driverName for f in formats2])
self.assertNotEqual(formats2[0].driverName, 'GTiff')
示例8: testSupportedFormatExtensions
def testSupportedFormatExtensions(self):
formats = QgsRasterFileWriter.supportedFormatExtensions()
self.assertTrue('tif' in formats)
self.assertFalse('exe' in formats)
self.assertEqual(formats[0], 'tif')
self.assertTrue('nc' in formats)
# alphabetical sorting
formats2 = QgsRasterFileWriter.supportedFormatExtensions(QgsRasterFileWriter.RasterFormatOptions())
self.assertTrue(formats2[1] < formats2[2])
self.assertCountEqual(formats, formats2)
self.assertNotEqual(formats2[0], 'tif')
示例9: run_raster_upload
def run_raster_upload(self):
# The selected layer should be a raster layer.
layer = self.iface.activeLayer()
if not isinstance(layer, QgsRasterLayer):
pop_up_info("Error: you must select the raster layer")
return
fd, tiff_filename = tempfile.mkstemp(suffix='.tiff')
os.close(fd)
# ^^^ We just want the filename, not the opened file descriptor.
provider = layer.dataProvider()
pipe = QgsRasterPipe()
pipe.set(provider.clone())
file_writer = QgsRasterFileWriter(tiff_filename)
file_writer.writeRaster(pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
# http://build-failed.blogspot.nl/2014/12/splitting-vector-and-raster-files-in.html
# print(tiff_filename)
# Optionally TODO: grab title from dialog.
title = "Uploaded by the qgis plugin on %s" % (
datetime.datetime.now().isoformat())
form = urllib2_upload.MultiPartForm()
form.add_field('title', title)
form.add_field('organisation_id', str(self.selected_organisation))
filename = os.path.basename(tiff_filename)
form.add_file('raster_file', filename, fileHandle=open(tiff_filename, 'rb'))
request = urllib2.Request('https://ggmn.un-igrac.org/upload_raster/')
request.add_header('User-agent', 'qgis ggmn uploader')
request.add_header('username', self.username)
request.add_header('password', self.password)
body = str(form)
request.add_header('Content-type', form.get_content_type())
request.add_header('Content-length', len(body))
# print("content-length: %s" % len(body))
request.add_data(body)
fd2, logfile = tempfile.mkstemp(prefix="uploadlog", suffix=".txt")
open(logfile, 'w').write(request.get_data())
# print("Printed what we'll send to %s" % logfile)
answer = urllib2.urlopen(request).read()
# print(answer)
# print("Uploaded geotiff to the server")
pop_up_info("Uploaded geotiff to the server")
示例10: polygonize_gdal
def polygonize_gdal(
raster,
threshold_min=0.0,
threshold_max=float('inf')):
"""
Function to polygonize raster. Areas (pixels) with threshold_min <
pixel_values < threshold_max will be converted to polygons.
:param raster: Raster layer
:type raster: QgsRasterLayer
:param threshold_min: Value that splits raster to flooded or not flooded.
:type threshold_min: float
:param threshold_max: Value that splits raster to flooded or not flooded.
:type threshold_max: float
:returns: Polygonal geometry
:rtype: QgsGeometry
"""
# save qgis raster to disk
base_name = unique_filename()
file_name = base_name + '.tif'
file_writer = QgsRasterFileWriter(file_name)
pipe = QgsRasterPipe()
provider = raster.dataProvider()
if not pipe.set(provider.clone()):
msg = "Cannot set pipe provider"
raise GetDataError(msg)
file_writer.writeRaster(
pipe,
provider.xSize(),
provider.ySize(),
provider.extent(),
provider.crs())
(
inside_file_name,
inside_layer_name,
outside_file_name,
outside_layer_name
) = polygonize_thresholds(file_name, threshold_min, threshold_max)
inside_layer = \
QgsVectorLayer(inside_file_name, inside_layer_name, 'ogr')
outside_layer = \
QgsVectorLayer(outside_file_name, outside_layer_name, 'ogr')
if inside_layer.featureCount() == 0:
return None, None
else:
return inside_layer, outside_layer
示例11: getConsoleCommands
def getConsoleCommands(self, parameters, context, feedback, executing=True):
ogrLayer, layerName = self.getOgrCompatibleSource(self.INPUT, parameters, context, feedback, executing)
arguments = ['-l']
arguments.append(layerName)
fieldName = self.parameterAsString(parameters, self.Z_FIELD, context)
if fieldName:
arguments.append('-zfield')
arguments.append(fieldName)
params = 'nearest'
params += ':radius1={}'.format(self.parameterAsDouble(parameters, self.RADIUS_1, context))
params += ':radius2={}'.format(self.parameterAsDouble(parameters, self.RADIUS_2, context))
params += ':angle={}'.format(self.parameterAsDouble(parameters, self.ANGLE, context))
params += ':nodata={}'.format(self.parameterAsDouble(parameters, self.NODATA, context))
arguments.append('-a')
arguments.append(params)
arguments.append('-ot')
arguments.append(self.TYPES[self.parameterAsEnum(parameters, self.DATA_TYPE, context)])
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
self.setOutputValue(self.OUTPUT, out)
arguments.append('-of')
arguments.append(QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]))
options = self.parameterAsString(parameters, self.OPTIONS, context)
if options:
arguments.extend(GdalUtils.parseCreationOptions(options))
arguments.append(ogrLayer)
arguments.append(out)
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
示例12: getConsoleCommands
def getConsoleCommands(self, parameters, context, feedback, executing=True):
arguments = ['aspect']
inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
if inLayer is None:
raise QgsProcessingException(self.invalidRasterError(parameters, self.INPUT))
arguments.append(inLayer.source())
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
arguments.append(out)
self.setOutputValue(self.OUTPUT, out)
arguments.append('-of')
arguments.append(QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]))
arguments.append('-b')
arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
if self.parameterAsBoolean(parameters, self.TRIG_ANGLE, context):
arguments.append('-trigonometric')
if self.parameterAsBoolean(parameters, self.ZERO_FLAT, context):
arguments.append('-zero_for_flat')
if self.parameterAsBoolean(parameters, self.COMPUTE_EDGES, context):
arguments.append('-compute_edges')
if self.parameterAsBoolean(parameters, self.ZEVENBERGEN, context):
arguments.append('-alg')
arguments.append('ZevenbergenThorne')
options = self.parameterAsString(parameters, self.OPTIONS, context)
if options:
arguments.extend(GdalUtils.parseCreationOptions(options))
return [self.commandName(), GdalUtils.escapeAndJoin(arguments)]
示例13: processAlgorithm
def processAlgorithm(self, parameters, context, feedback):
inputFile = self.parameterAsRasterLayer(parameters, self.INPUT, context).source()
zFactor = self.parameterAsDouble(parameters, self.Z_FACTOR, context)
automaticColors = self.parameterAsBoolean(parameters, self.AUTO_COLORS, context)
outputFile = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
frequencyDistribution = self.parameterAsFileOutput(parameters, self.FREQUENCY_DISTRIBUTION, context)
outputFormat = QgsRasterFileWriter.driverForExtension(os.path.splitext(outputFile)[1])
relief = QgsRelief(inputFile, outputFile, outputFormat)
if automaticColors:
reliefColors = relief.calculateOptimizedReliefClasses()
else:
colors = ParameterReliefColors.valueToColors(parameters[self.COLORS])
if colors is None or len(colors) == 0:
raise QgsProcessingException(
self.tr('Specify relief colors or activate "Generate relief classes automatically" option.'))
reliefColors = []
for c in colors:
v = c.split(',')
color = QgsRelief.ReliefColor(QColor(int(v[2]), int(v[3]), int(v[4])),
float(v[0]),
float(v[1]))
reliefColors.append(color)
relief.setReliefColors(reliefColors)
relief.setZFactor(zFactor)
if frequencyDistribution:
relief.exportFrequencyDistributionToCsv(frequencyDistribution)
relief.processRaster(feedback)
return {self.OUTPUT: outputFile, self.FREQUENCY_DISTRIBUTION: frequencyDistribution}
示例14: test02_SaveAsGeoTIFF
def test02_SaveAsGeoTIFF(self):
"""Save raster layer as a GeoTIFF file"""
self._testAvailable() or self.skipTest("Not available")
layer = self._testLayer(self.fileName)
# write to a disk
# ref. to the InaSAFE plugin
provider = layer.dataProvider()
pipe = QgsRasterPipe()
assert pipe.set(provider.clone()), "cannot set provider to pipe"
outfile = self._testDataPath(self.fileName, output=True)
writer = QgsRasterFileWriter(outfile)
assert not writer.writeRaster(pipe, provider.xSize(), provider.ySize(), provider.extent(), provider.crs()), "failed to write"
assert os.path.exists(outfile), "output file cannot be found"
示例15: getConsoleCommands
def getConsoleCommands(self, parameters, context, feedback, executing=True):
arguments = []
inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
arguments.append(inLayer.source())
out = self.parameterAsOutputLayer(parameters, self.OUTPUT, context)
arguments.append(out)
arguments.append('-of')
arguments.append(QgsRasterFileWriter.driverForExtension(os.path.splitext(out)[1]))
arguments.append('-b')
arguments.append(str(self.parameterAsInt(parameters, self.BAND, context)))
if self.parameterAsBool(parameters, self.RGBA, context):
arguments.append('-rgba')
commands = []
if isWindows():
commands = ['cmd.exe', '/C ', 'pct2rgb.bat',
GdalUtils.escapeAndJoin(arguments)]
else:
commands = ['pct2rgb.py', GdalUtils.escapeAndJoin(arguments)]
return commands