def get_percentage_value(rst, value, includeNodata=None):
"""
Return the % of cells with a certain value
"""
import numpy
from osgeo import gdal
from glass.pys.num import count_where
from glass.g.rd.rst import rst_to_array
from glass.g.prop.rst import get_nodata
array = rst_to_array(rst)
lnh, col = array.shape
nrcell = lnh * col
if not includeNodata:
nd = get_nodata(rst, gisApi='gdal')
nd_cells = count_where(array, array == nd)
nrcell = nrcell - nd_cells
valCount = count_where(array, array == value)
perc = (valCount / float(nrcell)) * 100
return perc
def bands_to_rst(inRst, outFolder):
"""
Export all bands of a raster to a new dataset
TODO: this could be done using gdal_translate
"""
import numpy
import os
from osgeo import gdal
from glass.g.wt.rst import obj_to_rst
from glass.g.prop.rst import get_nodata
rst = gdal.Open(inRst)
if rst.RasterCount == 1:
return
nodata = get_nodata(inRst)
for band in range(rst.RasterCount):
band += 1
src_band = rst.GetRasterBand(band)
if src_band is None:
continue
else:
# Convert to array
array = numpy.array(src_band.ReadAsArray())
obj_to_rst(array,
os.path.join(
outFolder, '{r}_{b}.tif'.format(r=os.path.basename(
os.path.splitext(inRst)[0]),
b=str(band))),
inRst,
noData=nodata)
def count_cells(raster, countNodata=None):
"""
Return number of cells in a Raster Dataset
"""
from glass.g.rd.rst import rst_to_array
from glass.pys.num import count_where
a = rst_to_array(raster)
lnh, col = a.shape
nrcell = lnh * col
if countNodata:
return nrcell
else:
NoDataValue = get_nodata(raster)
NrNodata = count_where(a, a == NoDataValue)
return nrcell - NrNodata
def percentage_nodata(rst):
"""
Return the % of cells with nodata value
"""
import numpy
from glass.pys.num import count_where
from glass.g.rd.rst import rst_to_array
from glass.g.prop.rst import get_nodata
array = rst_to_array(rst)
lnh, col = array.shape
nrcell = lnh * col
nd = get_nodata(rst, gisApi='gdal')
nd_cells = count_where(array, array == nd)
perc = (nd_cells / float(nrcell)) * 100
return perc
def comp_bnds(rsts, outRst):
"""
Composite Bands
"""
from osgeo import gdal, gdal_array
from glass.g.rd.rst import rst_to_array
from glass.g.prop import drv_name
from glass.g.prop.rst import get_nodata
from glass.g.prop.prj import get_rst_epsg, epsg_to_wkt
# Get Arrays
_as = [rst_to_array(r) for r in rsts]
# Get nodata values
nds = [get_nodata(r) for r in rsts]
# Assume that first raster is the template
img_temp = gdal.Open(rsts[0])
geo_tran = img_temp.GetGeoTransform()
band = img_temp.GetRasterBand(1)
dataType = gdal_array.NumericTypeCodeToGDALTypeCode(_as[0].dtype)
rows, cols = _as[0].shape
epsg = get_rst_epsg(rsts[0])
# Create Output
drv = gdal.GetDriverByName(drv_name(outRst))
out = drv.Create(outRst, cols, rows, len(_as), dataType)
out.SetGeoTransform(geo_tran)
out.SetProjection(epsg_to_wkt(epsg))
# Write all bands
for i in range(len(_as)):
outBand = out.GetRasterBand(i + 1)
outBand.SetNoDataValue(nds[i])
outBand.WriteArray(_as[i])
outBand.FlushCache()
return outRst
def rst_rotation(inFolder, template, outFolder, img_format='.tif'):
"""
Invert raster data
"""
import os
from osgeo import gdal
from glass.pys.oss import lst_ff
from glass.g.rd.rst import rst_to_array
from glass.g.prop.rst import get_nodata
from glass.g.wt.rst import obj_to_rst
rasters = lst_ff(inFolder, file_format=img_format)
for rst in rasters:
a = rst_to_array(rst)
nd = get_nodata(rst)
obj_to_rst(a[::-1],
os.path.join(outFolder, os.path.basename(rst)),
template,
noData=nd)
return outFolder
def update_globe_land_cover(original_globe_raster, osm_urban_atlas_raster,
osm_globe_raster, epsg, updated_globe_raster,
detailed_globe_raster):
"""
Update the original Glob Land 30 with the result of the conversion of
OSM DATA to the Globe Land Cover nomenclature;
Also updates he previous updated Glob Land 30 with the result of the
conversion of osm data to the Urban Atlas Nomenclature
"""
import os
import numpy as np
from glass.g.rd.rst import rst_to_array
from glass.g.prop.rst import get_cellsize, get_nodata
from glass.g.wt.rst import obj_to_rst
# ############################# #
# Convert images to numpy array #
# ############################# #
np_globe_original = rst_to_array(original_globe_raster)
np_globe_osm = rst_to_array(osm_globe_raster)
np_ua_osm = rst_to_array(osm_urban_atlas_raster)
# ################################## #
# Check the dimension of both images #
# ################################## #
if np_globe_original.shape != np_globe_osm.shape:
return (
'The Globe Land 30 raster (original) do not have the same number'
' of columns/lines comparing with the Globe Land 30 derived '
'from OSM data')
elif np_globe_original.shape != np_ua_osm.shape:
return (
'The Globe Land 30 raster (original) do not have the same '
'number of columns/lines comparing with the Urban Atlas raster '
'derived from OSM data')
elif np_globe_osm.shape != np_ua_osm.shape:
return (
'The Globe Land 30 derived from OSM data do not have the same '
'number of columns/lines comparing with the Urban Atlas raster '
'derived from OSM data')
# ############## #
# Check Cellsize #
# ############## #
cell_of_rsts = get_cellsize(
[original_globe_raster, osm_globe_raster, osm_urban_atlas_raster],
xy=True,
gisApi='gdal')
cell_globe_original = cell_of_rsts[original_globe_raster]
cell_globe_osm = cell_of_rsts[osm_globe_raster]
cell_ua_osm = cell_of_rsts[osm_urban_atlas_raster]
if cell_globe_original != cell_globe_osm:
return (
'The cellsize of the Globe Land 30 raster (original) is not the '
'same comparing with the Globe Land 30 derived from OSM data')
elif cell_globe_original != cell_ua_osm:
return (
'The cellsize of the Globe Land 30 raster (original) is not the '
'same comparing with the Urban Atlas raster derived from OSM data')
elif cell_ua_osm != cell_globe_osm:
return (
'The cellsize of the Globe Land 30 derived from OSM data is not '
'the same comparing with the Urban Atlas raster derived from '
'OSM data')
# ############################# #
# Get the Value of Nodata Cells #
# ############################# #
nodata_glob_original = get_nodata(original_globe_raster, gisApi='gdal')
nodata_glob_osm = get_nodata(osm_globe_raster, gisApi='gdal')
nodata_ua_osm = get_nodata(osm_urban_atlas_raster, gisApi='gdal')
# ######################################## #
# Create a new map - Globe Land 30 Updated #
# ######################################## #
"""
Create a new array with zeros...
1) The zeros will be replaced by the values in the Globe Land derived from
OSM.
2) The zeros will be replaced by the values in the Original Globe Land at
the cells with NULL data in the Globe Land derived from OSM.
The meta array will identify values origins in the updated raster:
1 - Orinal Raster
2 - OSM Derived Raster
"""
update_array = np.zeros(
(np_globe_original.shape[0], np_globe_original.shape[1]))
update_meta_array = np.zeros(
(np_globe_original.shape[0], np_globe_original.shape[1]))
# 1)
np.copyto(update_array, np_globe_osm, 'no',
np_globe_osm != nodata_glob_osm)
# 1) meta
np.place(update_meta_array, update_array != 0, 2)
# 2) meta
np.place(update_meta_array, update_array == 0, 1)
# 2)
np.copyto(update_array, np_globe_original, 'no', update_array == 0)
# 2) meta
np.place(update_meta_array, update_array == nodata_glob_original,
int(nodata_glob_original))
# noData to int
np.place(update_array, update_array == nodata_glob_original,
int(nodata_glob_original))
updated_meta = os.path.join(
os.path.dirname(updated_globe_raster), '{n}_meta{e}'.format(
n=os.path.splitext(os.path.basename(updated_globe_raster))[0],
e=os.path.splitext(os.path.basename(updated_globe_raster))[1]))
# Create Updated Globe Cover 30
obj_to_rst(update_array,
updated_globe_raster,
original_globe_raster,
noData=int(nodata_glob_original))
# Create Updated Globe Cover 30 meta
obj_to_rst(update_meta_array,
updated_meta,
original_globe_raster,
noData=int(nodata_glob_original))
# ################################################# #
# Create a new map - Globe Land 30 Detailed with UA #
# ################################################# #
np_update = rst_to_array(updated_globe_raster)
detailed_array = np.zeros((np_update.shape[0], np_update.shape[1]))
detailed_meta_array = np.zeros((np_update.shape[0], np_update.shape[1]))
"""
Replace 80 Globe Land for 11, 12, 13, 14 of Urban Atlas
The meta array will identify values origins in the detailed raster:
1 - Updated Raster
2 - UA Derived Raster from OSM
"""
# Globe - Mantain some classes
np.place(detailed_array, np_update == 30, 8)
np.place(detailed_array, np_update == 30, 1)
np.place(detailed_array, np_update == 40, 9)
np.place(detailed_array, np_update == 40, 1)
np.place(detailed_array, np_update == 50, 10)
np.place(detailed_array, np_update == 50, 1)
np.place(detailed_array, np_update == 10, 5)
np.place(detailed_array, np_update == 10, 1)
# Water bodies
np.place(detailed_array, np_ua_osm == 50 or np_update == 60, 7)
np.place(detailed_meta_array, np_ua_osm == 50 or np_update == 60, 1)
# Urban - Where Urban Atlas IS NOT NULL
np.place(detailed_array, np_ua_osm == 11, 1)
np.place(detailed_meta_array, np_ua_osm == 11, 2)
np.place(detailed_array, np_ua_osm == 12, 2)
np.place(detailed_meta_array, np_ua_osm == 12, 2)
np.place(detailed_array, np_ua_osm == 13, 3)
np.place(detailed_meta_array, np_ua_osm == 13, 2)
np.place(detailed_array, np_ua_osm == 14, 4)
np.place(detailed_meta_array, np_ua_osm == 14, 2)
# Urban Atlas - Class 30 to 6
np.place(detailed_array, np_ua_osm == 30, 6)
np.place(detailed_meta_array, np_ua_osm == 30, 2)
# Create Detailed Globe Cover 30
obj_to_rst(detailed_array,
detailed_globe_raster,
original_globe_raster,
noData=0)
# Create Detailed Globe Cover 30 meta
detailed_meta = os.path.join(
os.path.dirname(detailed_globe_raster), '{n}_meta{e}'.format(
n=os.path.splitext(os.path.basename(detailed_meta))[0],
e=os.path.splitext(os.path.basename(detailed_meta))[1]))
obj_to_rst(detailed_meta_array,
detailed_meta,
original_globe_raster,
noData=0)
def gdal_slope(dem, srs, slope, unit='DEGREES'):
"""
Create Slope Raster
TODO: Test and see if is running correctly
"""
import numpy; import math
from osgeo import gdal
from scipy.ndimage import convolve
from glass.g.rd.rst import rst_to_array
from glass.g.wt.rst import obj_to_rst
from glass.g.prop.rst import get_cellsize, get_nodata
# ################ #
# Global Variables #
# ################ #
cellsize = get_cellsize(dem, gisApi='gdal')
# Get Nodata Value
NoData = get_nodata(dem)
# #################### #
# Produce Slope Raster #
# #################### #
# Get Elevation array
arr_dem = rst_to_array(dem)
# We have to get a array with the number of nearst cells with values
with_data = numpy.zeros((arr_dem.shape[0], arr_dem.shape[1]))
numpy.place(with_data, arr_dem!=NoData, 1.0)
mask = numpy.array([[1,1,1],
[1,0,1],
[1,1,1]])
arr_neigh = convolve(with_data, mask, mode='constant')
numpy.place(arr_dem, arr_dem==NoData, 0.0)
# The rate of change in the x direction for the center cell e is:
kernel_dz_dx_left = numpy.array([[0,0,1],
[0,0,2],
[0,0,1]])
kernel_dz_dx_right = numpy.array([[1,0,0],
[2,0,0],
[1,0,0]])
dz_dx = (convolve(arr_dem, kernel_dz_dx_left, mode='constant')-convolve(arr_dem, kernel_dz_dx_right, mode='constant')) / (arr_neigh * cellsize)
# The rate of change in the y direction for cell e is:
kernel_dz_dy_left = numpy.array([[0,0,0],
[0,0,0],
[1,2,1]])
kernel_dz_dy_right = numpy.array([[1,2,1],
[0,0,0],
[0,0,0]])
dz_dy = (convolve(arr_dem, kernel_dz_dy_left, mode='constant')-convolve(arr_dem, kernel_dz_dy_right, mode='constant')) / (arr_neigh * cellsize)
# Taking the rate of change in the x and y direction, the slope for the center cell e is calculated using
rise_run = ((dz_dx)**2 + (dz_dy)**2)**0.5
if unit=='DEGREES':
arr_slope = numpy.arctan(rise_run) * 57.29578
elif unit =='PERCENT_RISE':
arr_slope = numpy.tan(numpy.arctan(rise_run)) * 100.0
# Estimate the slope for the cells with less than 8 neigh
aux_dem = rst_to_array(dem)
index_vizinhos = numpy.where(arr_neigh<8)
for idx in range(len(index_vizinhos[0])):
# Get Value of the cell
lnh = index_vizinhos[0][idx]
col = index_vizinhos[1][idx]
e = aux_dem[lnh][col]
a = aux_dem[lnh-1][col-1]
if a == NoData:
a = e
if lnh==0 or col==0:
a=e
b = aux_dem[lnh-1][col]
if b == NoData:
b = e
if lnh==0:
b=e
try:
c = aux_dem[lnh-1][col+1]
if c == NoData:
c=e
if lnh==0:
c=e
except:
c = e
d = aux_dem[lnh][col-1]
if d == NoData:
d = e
if col==0:
d=e
try:
f = aux_dem[lnh][col+1]
if f == NoData:
f=e
except:
f=e
try:
g = aux_dem[lnh+1][col-1]
if g == NoData:
g=e
if col==0:
g=e
except:
g=e
try:
h = aux_dem[lnh+1][col]
if h ==NoData:
h = e
except:
h=e
try:
i = aux_dem[lnh+1][col+1]
if i == NoData:
i = e
except:
i=e
dz_dx = ((c + 2*f + i) - (a + 2*d + g)) / (8 * cellsize)
dz_dy = ((g + 2*h + i) - (a + 2*b + c)) / (8 * cellsize)
rise_sun = ((dz_dx)**2 + (dz_dy)**2)**0.5
if unit == 'DEGREES':
arr_slope[lnh][col] = math.atan(rise_sun) * 57.29578
elif unit == 'PERCENT_RISE':
arr_slope[lnh][col] = math.tan(math.atan(rise_sun)) * 100.0
# Del value originally nodata
numpy.place(arr_slope, aux_dem==NoData, numpy.nan)
#arr_slope[lnh][col] = slope_degres
obj_to_rst(arr_slope, slope, dem)
