MapBox water/land detection

Question

I am starting to use the MapBox iOS SDK.

Is there any possible way to query the MapView by a coordinate and get back the terrain-type (water, land) as a result?

I've been reading the API doc for quite a while now, but could not figure it out. I know that there are (interim) solutions available to use a Google webservice, but I need this to work offline.

I am not bound to MapBox (but I like it) though, thank you for any hint!

score 2 · Accepted Answer · answered May 29 '17 at 08:48

2

No need to delve into runtime styling (see my other answer, false lead): very simple method using mapView.visibleFeatures(at: CGPoint, styleLayerIdentifiers: Set<String>) equivalent for javascript API is queryRenderedFeatures.

func mapView(_ mapView: MGLMapView, regionDidChangeAnimated animated: Bool)
{
    let features = mapView.visibleFeatures(at: mapView.center, styleLayerIdentifiers: ["water"])
    print(features)
}

Example output when moving around:

[]
[]
[]
[<MGLMultiPolygonFeature: 0x170284650>]

If empty result: no water, if polygon: water.

answered May 29 '17 at 08:48

François Legras

308
2
12

See also same for [android](https://stackoverflow.com/a/42728928/4601340) – François Legras May 29 '17 at 09:37
`visibleFeatures` means only get result for the *visible* result, right? What if I want to get features within certain distance which might be invisible? – Bagusflyer Dec 30 '20 at 03:30

François Legras · Answer 2 · 2017-05-29T08:49:29.657

It seems to be possible:

Found on https://www.mapbox.com/ios-sdk/api/3.5.0/runtime-styling.html

There is the possibility of adapting the UI according to the position of the user (park, city, water, etc.) Unfortunately I don't know how! (will update as soon as I find out)

Map interactivity You can customize the map to the point of having it respond dynamically based on the actions your users are taking. Increase the text size of streets while a user is driving, emphasize points of interest tailored to a user’s preferences, or change your UI if users are at parks, trails, landmarks, or rivers.

UI GIF demo

score 0 · Answer 3 · answered Dec 16 '13 at 19:56

0

I made a sample code that can help you a little bit. https://github.com/P0nj4/Coordinates-on-water-or-land

giving a coordinate, the app checks with google if it's land or water.

answered Dec 16 '13 at 19:56

Ponja

663
1
8
15

Thanks for your input, but a necessary feature of this mechanism is the offline usage, since this will be used on a sailboat where a fast enough internet connection is not provided to implement a routing algorithm against a webservice. I actually implemented it with OSM data. It works easily, in memory, and super fast. See my link in my above answer. – thomas Dec 16 '13 at 22:41

MapBox water/land detection

3 Answers3

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