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swn.SurfaceWaterNetwork.coarsen#

+
+
+SurfaceWaterNetwork.coarsen(level: int)#
+

Coarsen stream network to a minimum stream order level.

+
+
Parameters:
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levelint

Minimum stream order level, e.g. 3 to coarsen to 3rd order streams.

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+
+
+
Returns:
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+
SurfaceWaterNetwork

With the returned segments attribute, a traced_segnums +column containing a segnum list from the original network. +If the original network has catchment polygons, the result will +aggregate the relevant catchment polygons, listed with a +catchment_segnums column.

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+

See also

+
+
aggregate

Aggregate segments (and catchments) to a coarser network of segnums.

+
+
remove

Remove segments.

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+

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)
+>>> n2 = n.coarsen(2)
+>>> n2.segments[["stream_order", "traced_segnums"]]
+    stream_order traced_segnums
+102             2          [102]
+105             2          [105]
+108             3     [106, 108]
+109             3          [109]
+110             2          [110]
+111             2          [111]
+118             4     [116, 118]
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