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[processing] add Extract raster values to CSV algorithm
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python/plugins/processing/script/scripts/Extract_raster_values_to_CSV.py
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##[Example scripts]=group | ||
##Input_raster=raster | ||
##Input_vector=vector | ||
##Transform_vector_to_raster_CRS=boolean | ||
##Output_table=output table | ||
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import os | ||
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from osgeo import gdal, ogr, osr | ||
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from processing.core.TableWriter import TableWriter | ||
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
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from processing.algs import QGISUtils as utils | ||
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raster = gdal.Open(Input_raster) | ||
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rasterBaseName = os.path.splitext(os.path.basename(Input_raster))[0] | ||
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bandCount = raster.RasterCount | ||
rasterXSize = raster.RasterXSize | ||
rasterYSize = raster.RasterYSize | ||
geoTransform = raster.GetGeoTransform() | ||
rasterCRS = osr.SpatialReference() | ||
rasterCRS.ImportFromWkt(raster.GetProjectionRef()) | ||
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vector = ogr.Open(Input_vector, False) | ||
layer = vector.GetLayer(0) | ||
featureCount = layer.GetFeatureCount() | ||
if featureCount == 0: | ||
raise GeoAlgorithmExecutionException("There are no features in input vector.") | ||
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vectorCRS = layer.GetSpatialRef() | ||
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columns = [] | ||
featureDefn = layer.GetLayerDefn() | ||
for i in xrange(featureDefn.GetFieldCount()): | ||
fieldDefn = featureDefn.GetFieldDefn(i) | ||
columns.append([fieldDefn.GetNameRef()]) | ||
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layer.ResetReading() | ||
feature = layer.GetNextFeature() | ||
while feature is not None: | ||
for i in xrange(featureDefn.GetFieldCount()): | ||
fieldDefn = featureDefn.GetFieldDefn(i) | ||
if fieldDefn.GetType() == ogr.OFTInteger: | ||
columns[i].append(feature.GetFieldAsInteger(i)) | ||
elif fieldDefn.GetType() == ogr.OFTReal: | ||
columns[i].append(feature.GetFieldAsDouble(i)) | ||
else: | ||
columns[i].append(feature.GetFieldAsString(i)) | ||
feature = layer.GetNextFeature() | ||
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current = 0 | ||
total = bandCount + featureCount * bandCount | ||
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if Transform_vector_to_raster_CRS: | ||
coordTransform = osr.CoordinateTransformation(vectorCRS, rasterCRS) | ||
if coordTransform is None: | ||
raise GeoAlgorithmExecutionException("Error while creating coordinate transformation.") | ||
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columnName = rasterBaseName[:8] | ||
for i in xrange(bandCount): | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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rasterBand = raster.GetRasterBand(i + 1) | ||
data = rasterBand.ReadAsArray() | ||
layer.ResetReading() | ||
feature = layer.GetNextFeature() | ||
col = [] | ||
col.append(columnName + '_' + str(i + 1)) | ||
while feature is not None: | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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geometry = feature.GetGeometryRef() | ||
x = geometry.GetX() | ||
y = geometry.GetY() | ||
if Transform_vector_to_raster_CRS: | ||
pnt = coordTransform.TransformPoint(x, y, 0) | ||
x = pnt[0] | ||
y = pnt[1] | ||
rX, rY = utils.mapToPixel(x, y, geoTransform) | ||
if rX > rasterXSize or rY > rasterYSize: | ||
feature = layer.GetNextFeature() | ||
continue | ||
value = data[rY, rX] | ||
col.append(value) | ||
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feature = layer.GetNextFeature() | ||
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rasterBand = None | ||
columns.append(col) | ||
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raster = None | ||
vector.Destroy() | ||
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writer = TableWriter(Output_table, "utf-8", []) | ||
row = [] | ||
for i in xrange(len(columns[0])): | ||
for col in columns: | ||
row.append(col[i]) | ||
writer.addRecord(row) | ||
row[:] = [] |