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43 lines
1.7 KiB
Python
43 lines
1.7 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
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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'
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__date__ = 'February 2013'
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__copyright__ = '(C) 2013, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from osgeo import gdal
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from osgeo.gdalconst import *
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import struct
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def scanraster(layer, progress):
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filename = unicode(layer.source())
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dataset = gdal.Open(filename, GA_ReadOnly)
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band = dataset.GetRasterBand(1)
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nodata = band.GetNoDataValue()
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for y in xrange(band.YSize):
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progress.setPercentage(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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values = struct.unpack('f' * band.XSize, scanline)
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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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