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Pass polygons through if they’re small already

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If a polygon is smaller than the largest polygon in our dataset of
simplified polygons then we’re only throwing away useful detail by
simplifying it.

We should still simplify larger polygons as a fallback, to avoid sending
anything to the CBC that we’re not sure it will like.

The thresholds here are low: we can raise them as we test and experiment
more.

Here’s some data about the Flood Warning Service polygons

Percentile | 80% | 90%   | 95%    | 98%     | 99%     | 99.9%
-----------|-----|-------|--------|---------|---------|---------
Point count| 226 | 401.9 | 640.45 | 1015.38 | 1389.07 | 3008.609

Percentile    | 80% | 90%   | 95%    | 98%     | 99%     | 99.9%
--------------|-----|-------|--------|---------|---------|---------
Polygon count |2----|3------|5-------|8--------|10-------|40.469
This commit is contained in:
Chris Hill-Scott
2021-11-18 15:48:45 +00:00
parent 4feb3fdc10
commit c0742fe83d
4 changed files with 73 additions and 5 deletions
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2
app/broadcast_message/translators.py
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@@ -29,5 +29,5 @@ def cap_xml_polygon_to_list(polygon_string):
[
float(coordinate) for coordinate in pair.split(',')
]
for pair in polygon_string.split(' ')
for pair in polygon_string.strip().split(' ')
]