Crowdsourcing depth for openseamap
9 Replies
Oh wow, I had no idea that project exists. My main motivation for getting into SignalK a couple months ago was so I could start tracking my own depths and maybe do something like this eventually.
Looks like at least one other person has tried to make a SignalK plugin https://github.com/OpenSeaMap/depth_webfrontend/issues/230
Probably not a good sign that this is the second result when I search "openseamap depth" https://www.reddit.com/r/openstreetmap/comments/116k1ue/openseamap_depth_data_dead_project/
It"s dead because it's not share enough. If we can have a simple plugin / opt-in in signalk, all people that are using signalk will share datas automatically.
GarminQuickDraw vs OpenSeaMap Depth
This has already been discussed. It is not useful to collect depth data from people, as there is no way to determine the reference point from which the depth was measured.
That's not actually true. Navionics does this with their sonar charts and it's really good. Given shared reference points, you can determine the offset of an individual sensor. You just need enough data
@edouard_k are you thinking about building a plugin?
You just need enough dataHow much?
It depends, but the more data you have, the more accurate you can get. The perfect case would be you have a reading from two sensors from the exact same position at the exact same time. Obviously this is not possible. But given enough readings from enough reference points, you can calculate offsets of a sensor. Tides also make this interesting. It's definitely a hard problem, but it's not impossible.
Don't know how to do it, but i can try
Navionics Sonar vs GarminQuickDraw
I'm afraid you don't fully understand the problem.
