[21pt] Simplify OSM bridges

[CarsonPruitt-NOAA]

https://github.com/andycarter-pe/tx-bridge/blob/5eb0d18f35d53a180d1bae39921cc26b27dd275c/src/get_osm_bridge_lines_from_shp.py#L89-L92

[ZahraGhahremani]

I replaced feature_from_polygon with graph_from_polygon in the data/bridges/pull_osm_bridges.py and compared the results. There are differences in the attribute table fields.

Attribute Table in dev:

Attribute Table after using Simplify:

[CarsonPruitt-NOAA]

This is a potential solution for #1147.

[ZahraGhahremani]

The new script works very well in terms of displaying a single linestring for each bridge. Current version:

Previous version:

However, in some areas, it is unable to detect the bridges (see the figure). The green lines are bridges in both current and old version, the red lines are bridges only in the old version.

[CarsonPruitt-NOAA]

It seems like these missing bridges may not be roads. Are they railroads?

[ZahraGhahremani]

I tried dissolve function to merge touching lines. While it works well for addressing the previous issue, it also combines some bridges that should not be considered as a single bridge based on the current dev version and simplify technique.

Current dev:

Using dissolve:

Using dissolve- bridge lines are not merged based on the current dev version and simplify technique:

[ZahraGhahremani]

@AliForghani-NOAA The last bridge is in HUC 05030101 (Lat 40.5126 N, long: 80.1354 W).

[CarsonPruitt-NOAA]

As part of this task, can you also look into bridges that we're healing that are no longer there. An example was provided by the field for Honeoye Falls, NY ( HNYN6 / 04130003).

We need to figure out if our OSM bridge query is pulling "historical" bridges and how we can avoid that.

[CarsonPruitt-NOAA]

FYI, it's not appearing in the OSM online map, so there's got to be a way to filter these out.

[ZahraGhahremani]

These bridges are labeled as "abandoned" bridges and we can filter them out based on their bridge field.

[CarsonPruitt-NOAA]

Great find!

[CarsonPruitt-NOAA]

Can you also check to make sure this bridge is being removed from Churchville, NY in HUC 04130003 (CHRN6).

[ZahraGhahremani]

Yes. That bridge is an abandoned bridge too.

[ZahraGhahremani]

Here are some examples from HUC 04130003 after removing abandoned bridges. Red lines are abandoned bridges that don't appear in the new data (green lines).