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71 lines
2.7 KiB
Python
71 lines
2.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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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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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,
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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(
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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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