def transform_shape(shape, ssrs, tsrs):
""" Transform shape from ssrs to tsrs (all wkt) and return as wkt """
ogrgeom = CreateGeometryFromWkt(shape)
trans = CoordinateTransformation(SpatialReference(ssrs),
SpatialReference(tsrs))
ogrgeom.Transform(trans)
wkt = ogrgeom.ExportToWkt()
ogrgeom = None
return wkt
def _merge_layers(rows,
cols,
geotransform,
spatialreference,
array1,
array2,
min1,
max1,
min2,
max2,
nodata1=None,
nodata2=None):
path = create_tmp_filename('', ".tif")
# find the indexes of the arrays
index1 = (array1 > min1) & (array1 <= max1) & (array1 != nodata1)
index2 = (array2 > min2) & (array2 <= max2) & (array2 != nodata2)
# merge array indexes
compound_index = index1 & index2
del index1, index2
# create a new raster
output_raster = gdal.GetDriverByName('GTiff').Create(
path, rows, cols, 1, gdal.GDT_Int16) # Open the file
output_raster.SetGeoTransform(geotransform)
srs = SpatialReference(wkt=spatialreference)
output_raster.SetProjection(srs.ExportToWkt())
# create raster from the compound_index of the two rasters
# TODO: the reshape slows the operation, use matrixes
output_raster.GetRasterBand(1).WriteArray(
compound_index.reshape(cols, rows))
return path
def get_attrs(self):
from osr import SpatialReference
attrs = self.ds.GetMetadata()
try:
sp = SpatialReference(wkt=self.ds.GetProjection())
proj4 = sp.ExportToProj4()
except:
warn('Could not identify projection')
else:
attrs['proj4'] = proj4
return FrozenOrderedDict(attrs)
def parse_geotiff(gtiff_file):
"""Read a geotiff file and return the grid information in it.
"""
from osgeo import gdal
from osr import SpatialReference
g = gdal.Open(gtiff_file)
srs = SpatialReference(g.GetProjection())
proj4_str = srs.ExportToProj4()
gtransform = g.GetGeoTransform()
origin_x, x_psize, _, origin_y, _, y_psize = gtransform
width = g.RasterXSize
height = g.RasterYSize
return proj4_str, width, height, origin_x, origin_y, x_psize, y_psize
def gdal_translate(src_filename,
dst_filename,
dst_format="GTiff",
bands=None,
nodata=None,
projection=None,
options=None):
"""
Convert a raster image with the specified arguments (as if running from commandline)
:param argstring: command line arguments as string
:return: Result of gdal_translate process (success or failure)
"""
from osgeo import gdal
from osr import SpatialReference
if not options:
options = []
# Open existing dataset, subsetting bands if necessary
if bands:
tmp_file = src_filename + ".sub"
gdal_band_subset(src_filename, bands, tmp_file)
src_ds = gdal.Open(tmp_file)
else:
src_ds = gdal.Open(src_filename)
try:
#Open output format driver, see gdal_translate --formats for list
driver = gdal.GetDriverByName(dst_format)
#Output to new format
dst_ds = driver.CreateCopy(dst_filename, src_ds, 0, options)
if projection:
srs = SpatialReference()
srs.SetWellKnownGeogCS(projection)
dst_ds.SetProjection(srs.ExportToWkt())
if nodata is not None:
band = dst_ds.GetRasterBand(1)
band.SetNoDataValue(nodata)
finally:
#Properly close the datasets to flush to disk
dst_ds = None
src_ds = None
band = None
if bands and tmp_file:
os.remove(tmp_file)
def calc_elevation_models(self):
for item in range(len(self.data_lst)):
file_name = self.data_lst[item].strip(".xyz")
self.outfile = os.path.join(self.outfolder, file_name + ".tif")
x, y, z = np.loadtxt(self.data_lst[item], skiprows=1, unpack=True)
xmin, xmax, ymin, ymax = [min(x), max(x), min(y), max(y)]
#size of the grid
nx = (int(xmax - xmin + 1))
ny = (int(ymax - ymin + 1))
# Generate a regular grid to interpolate the data.
xi = np.linspace(xmin, xmax, nx)
yi = np.linspace(ymin, ymax, ny)
xi, yi = np.meshgrid(xi, yi)
# adding the z - values
zi = il.griddata((x, y), z, (xi, yi),
method='nearest') # linear, cubic, nearest
#--------------- Write to GeoTIFF ------------------------
nrows, ncols = np.shape(zi)
xres = (xmax - xmin) / float(ncols)
yres = (ymax - ymin) / float(nrows)
geotransform = (xmin, xres, 0, ymin, 0, yres)
self.outDS = gdal.GetDriverByName('GTiff').Create(
self.outfile, ncols, nrows, 1, gdal.GDT_Float32,
['TFW=YES', 'COMPRESS=PACKBITS'])
self.outDS.SetGeoTransform(geotransform) # Specify its coordinates
srs = SpatialReference() # Establish its coordinate encoding
srs.ImportFromEPSG(self.epsg) # WGS 84 / UTM zone 32N
self.outDS.SetProjection(
srs.ExportToWkt()) # Exports the coordinate system to the file
self.outDS.GetRasterBand(1).WriteArray(
zi) # Writes my array to the raster
#self.outDS.FlushCache()
self.data_out_lst.append(self.outfile)
self.outDS = None
zi = None
x, y, z = None, None, None
nrows, ncols = None, None
return [self.message, self.data_out_lst]
def __init__(self, src):
"""
initialize shapefile reader
"""
if isinstance(src, unicode):
src = src.encode('ascii', 'ignore')
src = self.find_source(src)
self.shpSrc = src
self.sr = shapefile.Reader(src)
self.recs = []
self.shapes = {}
self.load_records()
self.proj = None
# Check if there's a spatial reference
prj_src = src[:-4] + '.prj'
if exists(prj_src):
prj_text = open(prj_src).read()
srs = SpatialReference()
if srs.ImportFromWkt(prj_text):
raise ValueError("Error importing PRJ information from: %s" %
prj_file)
if srs.IsProjected():
self.proj = pyproj.Proj(srs.ExportToProj4())
print srs.ExportToProj4()
def SubbasinDelineation(np, workingDir, dem,outlet, threshold, mpiexeDir=None,exeDir=None):
if not os.path.exists(workingDir):
os.mkdir(workingDir)
statusFile = workingDir + os.sep + "status_SubbasinDelineation.txt"
fStatus = open(statusFile, 'w')
tauDir = workingDir + os.sep + "taudir"
if not os.path.exists(tauDir):
os.mkdir(tauDir)
status = "Fill DEM..."
fStatus.write("%d,%s\n" % (10, status))
fStatus.flush()
print Fill(np, tauDir, dem, filledDem, mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Calculating D8 and Dinf flow direction..."
fStatus.write("%d,%s\n" % (20, status))
fStatus.flush()
print FlowDirD8(np, tauDir, filledDem, flowDir, slope, mpiexeDir=mpiexeDir,exeDir=exeDir)
print GenerateDinf(np, tauDir, filledDem, flowDirDinf, slopeDinf, dirCodeDinf, weightDinf,mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Generating stream skeleton..."
fStatus.write("%d,%s\n" % (30, status))
fStatus.flush()
print StreamSkeleton(np, tauDir, filledDem, streamSkeleton,mpiexeDir=mpiexeDir, exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "D8 flow accumulation..."
fStatus.write("%d,%s\n" % (40, status))
fStatus.flush()
print FlowAccD8(np, tauDir, flowDir, acc,outlet=None, streamSkeleton=None, mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Generating stream raster initially..."
fStatus.write("%d,%s\n" % (50, status))
fStatus.flush()
if threshold != 0:
print StreamRaster(np, tauDir, acc, streamRaster, threshold, mpiexeDir=mpiexeDir,exeDir=exeDir)
else:
accD8 = tauDir+os.sep+acc
maxAccum, minAccum, meanAccum, STDAccum = util.GetRasterStat(accD8)
print StreamRaster(np, tauDir, acc, streamRaster, meanAccum, mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Moving outlet to stream..."
fStatus.write("%d,%s\n" % (60, status))
fStatus.flush()
print MoveOutlet(np, tauDir, flowDir, streamRaster, outlet, modifiedOutlet, mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Flow accumulation with outlet..."
fStatus.write("%d,%s\n" % (70, status))
fStatus.flush()
print FlowAccD8(np, tauDir, flowDir, acc, modifiedOutlet, streamSkeleton, mpiexeDir=mpiexeDir, exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
if threshold == 0:
status = "Drop analysis to select optimal threshold..."
fStatus.write("%d,%s\n" % (75, status))
fStatus.flush()
if meanAccum - STDAccum < 0:
minthresh = meanAccum
else:
minthresh = meanAccum - STDAccum
maxthresh = meanAccum + STDAccum
numthresh = 20
logspace = 'true'
drpFile = 'drp.txt'
print DropAnalysis(np,tauDir,filledDem,flowDir,acc,acc,modifiedOutlet,minthresh,maxthresh,numthresh,logspace,drpFile, mpiexeDir=mpiexeDir,exeDir=exeDir)
drpf = open(drpFile,"r")
tempContents=drpf.read()
(beg,threshold)=tempContents.rsplit(' ',1)
print threshold
drpf.close()
print "[Output], %s, %s" % (workingDir, status)
status = "Generating stream raster..."
fStatus.write("%d,%s\n" % (80, status))
fStatus.flush()
print StreamRaster(np, tauDir, acc, streamRaster, float(threshold), mpiexeDir=mpiexeDir,exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
status = "Generating stream net..."
fStatus.write("%d,%s\n" % (90, status))
fStatus.flush()
print StreamNet(np, tauDir, filledDem, flowDir, acc, streamRaster, modifiedOutlet, streamOrder, chNetwork, chCoord, streamNet, subbasin, mpiexeDir=mpiexeDir, exeDir=exeDir)
print "[Output], %s, %s" % (workingDir, status)
fStatus.write("100,subbasin delineation is finished!")
fStatus.close()
ds = gdal.Open(dem)
configFile = workingDir + os.sep + 'ProjConfig.txt'
f = open(configFile, 'w')
f.write(dem + "\n")
f.write(str(threshold) + "\n")
projWkt = ds.GetProjection()
srs = SpatialReference()
srs.ImportFromWkt(projWkt)
proj4Str = srs.ExportToProj4()
f.write(proj4Str + "\n")
f.close()