def get_flowgrid(catchment_geom, transformToRaster, transformToWGS84):
"""Use a 90 meter buffer of the local catchment to clip NHD Plus v2 flow direction raster"""
print('start clip raster')
with rasterio.open(IN_FDR_COG, 'r') as ds:
# get raster crs
dest_crs = ds.crs
# create wgs84 crs
wgs84 = pyproj.CRS('EPSG:4326')
# check to see if raster is already wgs84
latlon = dest_crs == wgs84
# transform catchment geometry to use for clip
projected_catchment_geom = transform_geom(transformToRaster,
catchment_geom)
# buffer catchment geometry by 90m before clipping flow direction raster
buffer_projected_catchment_geom = GeometryCollection(
[projected_catchment_geom.buffer(90)])
# clip input fd
flwdir, flwdir_transform = rasterio.mask.mask(
ds, buffer_projected_catchment_geom, crop=True)
print('finish clip raster')
# import clipped fdr into pyflwdir
flw = pyflwdir.from_array(flwdir[0],
ftype='d8',
transform=flwdir_transform,
latlon=latlon)
return flw, flwdir_transform
def get_pfafstetter_code(dir_d8_path, acc_path, pfaf_path, stream_th, level=1):
with rasterio.open(dir_d8_path, 'r') as src:
flwdir = src.read(1)
transform = src.transform
latlon = True
flw = pyflwdir.from_array(flwdir,
ftype='d8',
transform=transform,
latlon=latlon)
# upstream_cells = flw.upstream_area()
with rasterio.open(acc_path, 'r') as acc_f:
upstream_cells = acc_f.read(1)
crs_r = crs.CRS.from_wkt(
'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,'
'AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,'
'AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG",'
'"9122"]],AUTHORITY["EPSG","4326"]]')
pfaf = flw.pfafstetter(level, upstream_cells, stream_th)
profile = src.profile
profile.update(dtype=rasterio.uint32,
count=1,
compress='deflate',
crs=crs_r)
with rasterio.open(pfaf_path, 'w', **profile) as dst:
dst.write(pfaf, 1)
def split_catchment(catchment_geom, projected_xy, transformToRaster,
transformToWGS84):
"""Produce split catchment delienation from X,Y"""
print('start split catchment...')
with rasterio.open(IN_FDR_COG, 'r') as ds:
# get raster crs
dest_crs = ds.crs
# create wgs84 crs
wgs84 = pyproj.CRS('EPSG:4326')
# check to see if raster is already wgs84
latlon = dest_crs == wgs84
# transform catchment geometry to use for clip
projected_catchment_geom = transform_geom(transformToRaster,
catchment_geom)
# buffer catchment geometry by 0m before clipping flow direction raster
buffer_projected_catchment_geom = GeometryCollection(
[projected_catchment_geom.buffer(0)])
# clip input fd
flwdir, flwdir_transform = rasterio.mask.mask(
ds, buffer_projected_catchment_geom, crop=True)
print('finish clip raster')
# import clipped fdr into pyflwdir
flw = pyflwdir.from_array(flwdir[0],
ftype='d8',
transform=flwdir_transform,
latlon=latlon)
# used for snapping click point
# stream_order = flw.stream_order()
# delineate subbasins
subbasins = flw.basins(xy=projected_xy) # streams=stream_order>4
# convert subbasins from uint32
subbasins = subbasins.astype(np.int32)
# convert raster to features
mask = subbasins != 0
polys = rasterio.features.shapes(subbasins,
transform=flwdir_transform,
mask=mask)
# just get one we want [not sure why we need to grab this]
poly = next(polys)
# project back to wgs84
split_geom = transform(transformToWGS84, shape(poly[0]))
print('finish split catchment...')
return split_geom
def split_catchment(self, catchment_geom, x, y):
"""Use catchment bounding box to clip NHD Plus v2 flow direction raster, and product split catchment delienation from X,Y"""
print('start clip raster')
with rasterio.open(IN_FDR_COG, 'r') as ds:
#get raster crs
dest_crs = ds.crs
#create wgs84 crs
wgs84 = pyproj.CRS('EPSG:4326')
#check to see if raster is already wgs84
latlon = dest_crs == wgs84
self.transformToRaster = pyproj.Transformer.from_crs(
wgs84, dest_crs, always_xy=True).transform
self.transformToWGS84 = pyproj.Transformer.from_crs(
dest_crs, wgs84, always_xy=True).transform
#transform catchment geometry to use for clip
projected_catchment_geom = self.transform_geom(
self.transformToRaster, catchment_geom)
#clip input fd
flwdir, flwdir_transform = rasterio.mask.mask(
ds, projected_catchment_geom, crop=True)
print('finish clip raster')
#import clipped fdr into pyflwdir
flw = pyflwdir.from_array(flwdir[0],
ftype='d8',
transform=flwdir_transform,
latlon=latlon)
point_geom = Point(self.x, self.y)
print('original point:', point_geom)
projected_point = transform(self.transformToRaster, point_geom)
print('projected point:', projected_point)
xy = projected_point.coords[:][0]
#used for snapping click point
stream_order = flw.stream_order()
print('start split catchment...')
# delineate subbasins
subbasins = flw.basins(xy=xy, streams=stream_order > 4)
#convert subbasins from uint32
subbasins = subbasins.astype(np.int32)
#convert raster to features
mask = subbasins != 0
polys = rasterio.features.shapes(subbasins,
transform=flwdir_transform,
mask=mask)
#just get one we want [not sure why we need to grab this]
poly = next(polys)
#project back to wgs84
split_geom = transform(self.transformToWGS84, shape(poly[0]))
print('finish split catchment...')
return split_geom
