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# -*- coding: utf-8 -*-
"""
***************************************************************************
raster.py
---------------------
Date : February 2013
Copyright : (C) 2013 by Victor Olaya and Alexander Bruy
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya and Alexander Bruy'
__date__ = 'February 2013'
__copyright__ = '(C) 2013, Victor Olaya and Alexander Bruy'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import struct
import numpy
from osgeo import gdal
from osgeo.gdalconst import GA_ReadOnly
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
def scanraster(layer, progress):
filename = unicode(layer.source())
dataset = gdal.Open(filename, GA_ReadOnly)
band = dataset.GetRasterBand(1)
nodata = band.GetNoDataValue()
bandtype = gdal.GetDataTypeName(band.DataType)
for y in xrange(band.YSize):
progress.setPercentage(y / float(band.YSize) * 100)
scanline = band.ReadRaster(0, y, band.XSize, 1, band.XSize, 1,
band.DataType)
if bandtype == 'Byte':
values = struct.unpack('B' * band.XSize, scanline)
elif bandtype == 'Int16':
values = struct.unpack('h' * band.XSize, scanline)
elif bandtype == 'UInt16':
values = struct.unpack('H' * band.XSize, scanline)
elif bandtype == 'Int32':
values = struct.unpack('i' * band.XSize, scanline)
elif bandtype == 'UInt32':
values = struct.unpack('I' * band.XSize, scanline)
elif bandtype == 'Float32':
values = struct.unpack('f' * band.XSize, scanline)
elif bandtype == 'Float64':
values = struct.unpack('d' * band.XSize, scanline)
else:
raise GeoAlgorithmExecutionException('Raster format not supported')
for value in values:
if value == nodata:
value = None
yield value
def mapToPixel(mX, mY, geoTransform):
try:
# GDAL 1.x
(pX, pY) = gdal.ApplyGeoTransform(
gdal.InvGeoTransform(geoTransform)[1], mX, mY)
except TypeError:
# GDAL 2.x
(pX, pY) = gdal.ApplyGeoTransform(
gdal.InvGeoTransform(geoTransform), mX, mY)
return (int(pX), int(pY))
def pixelToMap(pX, pY, geoTransform):
return gdal.ApplyGeoTransform(geoTransform, pX + 0.5, pY + 0.5)
class RasterWriter:
NODATA = -99999.0
def __init__(self, fileName, minx, miny, maxx, maxy, cellsize,
nbands, crs, geotransform=None):
self.fileName = fileName
self.nx = int((maxx - minx) / float(cellsize))
self.ny = int((maxy - miny) / float(cellsize))
self.nbands = nbands
self.matrix = numpy.empty(shape=(self.ny, self.nx), dtype=numpy.float32)
self.matrix.fill(self.NODATA)
self.cellsize = cellsize
self.crs = crs
self.minx = minx
self.maxy = maxy
self.geotransform = geotransform
def setValue(self, value, x, y, band=0):
try:
self.matrix[y, x] = value
except IndexError:
pass
def getValue(self, x, y, band=0):
try:
return self.matrix[y, x]
except IndexError:
return self.NODATA
def close(self):
format = 'GTiff'
driver = gdal.GetDriverByName(format)
dst_ds = driver.Create(self.fileName, self.nx, self.ny, 1,
gdal.GDT_Float32)
dst_ds.SetProjection(str(self.crs.toWkt()))
if self.geotransform is None:
dst_ds.SetGeoTransform([self.minx, self.cellsize, 0,
self.maxy, self.cellsize, 0])
else:
dst_ds.SetGeoTransform(self.geotransform)
dst_ds.GetRasterBand(1).WriteArray(self.matrix)
dst_ds = None
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