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69 lines
2.7 KiB
Python
69 lines
2.7 KiB
Python
"""
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***************************************************************************
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raster.py
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---------------------
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Date : February 2013
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Copyright : (C) 2013 by Victor Olaya and Alexander Bruy
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = "Victor Olaya and Alexander Bruy"
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__date__ = "February 2013"
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__copyright__ = "(C) 2013, Victor Olaya and Alexander Bruy"
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import struct
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from osgeo import gdal
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from qgis.core import QgsProcessingException
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gdal.UseExceptions()
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def scanraster(layer, feedback, band_number=1):
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filename = str(layer.source())
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dataset = gdal.Open(filename, gdal.GA_ReadOnly)
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band = dataset.GetRasterBand(band_number)
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nodata = band.GetNoDataValue()
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bandtype = gdal.GetDataTypeName(band.DataType)
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for y in range(band.YSize):
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feedback.setProgress(y / float(band.YSize) * 100)
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scanline = band.ReadRaster(0, y, band.XSize, 1, band.XSize, 1, band.DataType)
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if bandtype == "Byte":
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values = struct.unpack("B" * band.XSize, scanline)
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elif bandtype == "Int16":
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values = struct.unpack("h" * band.XSize, scanline)
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elif bandtype == "UInt16":
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values = struct.unpack("H" * band.XSize, scanline)
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elif bandtype == "Int32":
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values = struct.unpack("i" * band.XSize, scanline)
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elif bandtype == "UInt32":
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values = struct.unpack("I" * band.XSize, scanline)
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elif bandtype == "Float32":
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values = struct.unpack("f" * band.XSize, scanline)
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elif bandtype == "Float64":
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values = struct.unpack("d" * band.XSize, scanline)
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else:
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raise QgsProcessingException("Raster format not supported")
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for value in values:
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if value == nodata:
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value = None
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yield value
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def mapToPixel(mX, mY, geoTransform):
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(pX, pY) = gdal.ApplyGeoTransform(gdal.InvGeoTransform(geoTransform), mX, mY)
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return (int(pX), int(pY))
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def pixelToMap(pX, pY, geoTransform):
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return gdal.ApplyGeoTransform(geoTransform, pX + 0.5, pY + 0.5)
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