Hey everyone,
I’m currently working on a research project to collect a dataset of images labeled with the guard rails or no guard rails. And I was wondering if someone could point me in the right direction to get the dataset that would really help.
I was able to find through the blog that there’s a feature value “construction–guard–rail” that I could use to filter images but I’m not sure if that is still in the works given the new modification of v4.
Thank you
Hello 5anyam,
As best I can tell Mapillary doesn’t currently support line features, including “construction–guard–rail” in either the web viewer or via the API. They are not mentioned in either of the following pages:
I’d love to be wrong on this point, and if anyone from Mapillary knows differently please let us know.
That’s a bit of a bummer for detecting guardrail using solely the Mapillary platform as there isn’t really a point feature that corresponds 1:1 with guardrail. It may be worth trying “Traffic Sign Frame” and maybe “Pole” since these objects are often surrounded by guardrail in the USA.
In lieu of a Mapillary only solution I know of another free dataset you should be able to use. The good people of Open Street Map (OSM) have mapped about 100,000 guardrails around the world.
https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dguard_rail
You could use Overpass Turbo to download that dataset, draw a bounding box around each guardrail, and then download high quality Mapillary images based on those bounding boxes. It’s a bit messy and it’s going to require a fair bit of cleaning once you’re done with it, but at least it’s free.
I hope that helps.
Thanks @aiden for your response, I confirm that currently Mapillary does not support line feature extraction.
Hi Aiden - is there anyway to get the guard rail layer file? i am trying to find in in qis and open maps
@aiden We have listed available detections here, Mapillary API V4: Common Questions You can retrieve all images and their locations where construction–guard–rail detected however these are image locations.
Please let me know if this helps.
Said