1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
from ctypes import byref, c_int
from django.contrib.gis.gdal.base import GDALBase
from django.contrib.gis.gdal.prototypes import raster as capi
from django.utils.encoding import force_text
from .const import GDAL_PIXEL_TYPES
class GDALBand(GDALBase):
"""
Wraps a GDAL raster band, needs to be obtained from a GDALRaster object.
"""
def __init__(self, source, index):
self.source = source
self.ptr = capi.get_ds_raster_band(source.ptr, index)
@property
def description(self):
"""
Returns the description string of the band.
"""
return force_text(capi.get_band_description(self.ptr))
@property
def width(self):
"""
Width (X axis) in pixels of the band.
"""
return capi.get_band_xsize(self.ptr)
@property
def height(self):
"""
Height (Y axis) in pixels of the band.
"""
return capi.get_band_ysize(self.ptr)
def datatype(self, as_string=False):
"""
Returns the GDAL Pixel Datatype for this band.
"""
dtype = capi.get_band_datatype(self.ptr)
if as_string:
dtype = GDAL_PIXEL_TYPES[dtype]
return dtype
@property
def min(self):
"""
Returns the minimum pixel value for this band.
"""
return capi.get_band_minimum(self.ptr, byref(c_int()))
@property
def max(self):
"""
Returns the maximum pixel value for this band.
"""
return capi.get_band_maximum(self.ptr, byref(c_int()))
@property
def nodata_value(self):
"""
Returns the nodata value for this band, or None if it isn't set.
"""
nodata_exists = c_int()
value = capi.get_band_nodata_value(self.ptr, nodata_exists)
return value if nodata_exists else None
|
