"No objects to concatenate" error from Roadway.create_roadway_network_from_extracts()

[BYerraWSP]

Step #3 in the Ranch-Demo notebook is giving a "No objects to concatenate" error. Step #3 calls Roadway.create_roadway_network_from_extracts(). I believe the issue is while executing the function call to "extract_osm_link_from_shst_extraction". [Previous step of extracting SharedStreet and osmnx were successful.]

[i-am-sijia]

I would first check the sharedstreets extraction output files located at 'shst_extract_dir' defined in the notebook, like the output geojson file, see if it makes sense.

[yueshuaing]

The read_shst_extraction(shst_extract_dir, "*.out.geojson") function is reading any files end with '.out.geojson' in 'shst_extract_dir', but my 'shst_extract_dir' only has one file named 'boundary.0.geojson' after running step1.
Based on the Ranch-Demo.ipynb, seems that the 'shst_extract_dir' should have two files extract.boundary.0.out.geojson and out.out.geojson
That's probably the reason why it got nothing to concatenate

[i-am-sijia]

Thanks @yueshuaing. boundary.x.geojson is the input geojson to shst extract command. So it sounds like the shst extraction was unsuccessful for you. Can you try the following:

Open command line prompt, run the following (replace /d with the path to your run folder, so the /usr/node folder on the linux machine is mounted to your run folder):
docker run -it --rm -v /d:/usr/node/ shst:latest /bin/bash

You should see a container running in command line, and then run shst extraction by the following (replace the 'data/external/sharedstreets_extract' string with your folder setting):
shst extract usr/node/data/external/sharedstreets_extract/boundary.0.geojson --out=usr/node/data/external/sharedstreets_extract/boundary.0.out.geojson --metadata --tile-hierarchy=8 --tiles

This way you can monitor what's going on inside of the container when executing shst extraction. I suspect you would get some error.

[i-am-sijia]

If shst extraction is successful, you should see files like below:

• extract.boundary.0.out.geojson: this is the output file of links from shst extraction
• extract.boundary.0.tiles.txt: this is the log file of osm tiles used in shst extraction
• boundary.0.geojson: this is the input file to shst extraction command