def create_raster_sld(self, filename, quantiles=False, verbose=False):
"""given a raster file and a predefined SLD template it should find the min,max,nodata values
for the dataset and create a custom style with a color map using the predefined template sld
which is located in module sld_template.py
If quantiles is True, 10 quantiles will be used for colour coding. Othewise 10 equidistant intervals will be used.
"""
pathname, extension = os.path.splitext(filename)
layername = os.path.basename(pathname)
R = raster.read_coverage(filename)
levels = R.get_bins(N=10, quantiles=quantiles)
nodata = R.get_nodata_value()
#if verbose:
# print 'Styling %s' %layername
# print 'Levels', levels
# print 'NoData', nodata
# Write the SLD file
sld = layername+'.sld'
text = sld_template.sld_template
text = text.replace('MIN',str(levels[0]))
text = text.replace('MAX',str(levels[-1]))
text = text.replace('TEN',str(levels[1]))
text = text.replace('TWENTY',str(levels[2]))
text = text.replace('THIRTY',str(levels[3]))
text = text.replace('FOURTY',str(levels[4]))
text = text.replace('FIFTY',str(levels[5]))
text = text.replace('SIXTY',str(levels[6]))
text = text.replace('SEVENTY',str(levels[7]))
text = text.replace('EIGHTY',str(levels[8]))
text = text.replace('NINETY',str(levels[9]))
# Getting round an sld parsing bug in geoserver
if nodata >= max:
text = text.replace('<!--Higher-->', '<ColorMapEntry color="#ffffff" quantity="NODATA" opacity="0"/>')
else:
text = text.replace('<!--Lower-->', '<ColorMapEntry color="#ffffff" quantity="NODATA" opacity="0"/>')
text = text.replace('NODATA', str(nodata))
fout = open(sld, 'w')
fout.write(text)
fout.close()
def get_raster_data(self,
coverage_name,
bounding_box=None,
workspace=None,
verbose=False):
"""Retrieve named coverage layer as Python numpy struture
"""
# Download coverage into ASCII file
ascii_filename = self.download_coverage(coverage_name,
bounding_box=bounding_box,
workspace=workspace,
format='GeoTIFF',
verbose=verbose)
# Read resulting ASCII file into internal numerical structure and return
return raster.read_coverage(ascii_filename)