swn.SurfaceWaterNetwork.evaluate_upstream_length#

SurfaceWaterNetwork.evaluate_upstream_length()#

Evaluate upstream length of segments, adds to segments.

See also

remove: Remove segments.

Examples

>>> import swn
>>> from shapely import wkt
>>> lines = geopandas.GeoSeries(list(wkt.loads('''\
... MULTILINESTRING(
...     (380 490, 370 420), (300 460, 370 420), (370 420, 420 330),
...     (190 250, 280 270), (225 180, 280 270), (280 270, 420 330),
...     (420 330, 584 250), (520 220, 584 250), (584 250, 710 160),
...     (740 270, 710 160), (735 350, 740 270), (880 320, 740 270),
...     (925 370, 880 320), (974 300, 880 320), (760 460, 735 350),
...     (650 430, 735 350), (710 160, 770 100), (700  90, 770 100),
...     (770 100, 820  40))''').geoms))
>>> lines.index += 100
>>> n = swn.SurfaceWaterNetwork.from_lines(lines)
>>> n.remove(n.segments.stream_order == 1)
>>> n.segments[["stream_order", "upstream_length"]]
     stream_order  upstream_length
102             2       254.289557
105             2       349.986022
106             3       786.747495
108             3      1012.271738
109             3       735.737875
110             2       309.687415
111             2       312.032918
116             4      1832.862427
118             4      1981.675602
>>> n.evaluate_upstream_length()
>>> n.segments[["stream_order", "upstream_length"]]
     stream_order  upstream_length
102             2       102.956301
105             2       152.315462
106             3       437.743679
108             3       592.585534
109             3       342.834328
110             2        80.156098
111             2       148.660687
116             4      1020.272675
118             4      1098.375172