Returned feature coordinates different then original feature?

[bdullemond]

Hi there, loving maplibre for the past 6 months in a project. You are doing great work.

I ran into something and I want to confirm its expected behaviour. I have a map with points and when I click on those points I have a popup appear to display the clicked feature's details include coordinate. However, if I make a point at say [-75.0, 45.0] depending on the zoom level I get an approximation of that coordinate in the feature's geometry property, with it being more accurate as I zoom in.

The same thing has happened with map.queryRenderedFeatures(...) call.

Is this expected? I really want to get the original coordinates the feature was created with.
Thanks!

EDIT: example: https://codepen.io/Terribill/pen/KKvZNjx

[wipfli]

I am glad you enjoy using MapLibre. From what I have seen in the unit test, numerical equality checks are usually restricted to only a few digits. So I guess what you show here is the expected behavior.

[astridx]

I also think that the output in your popup is correct. If I read the documentation and the code for map.on('mouseenter', 'places',..) correctly, then the coordinate of the mouse position on the places layer is displayed as accurately as possible.

The source, I mean the value for e.features[0].geometry.coordinates of the GeoJson is not the target of the event. I think that is what you expect. But you would have to do this differently.

In your case, however, I think that the easiest thing to do is to use:

popup.setLngLat(coordinates).setHTML(description + coordinates[0].toFixed(2) + "," + coordinates[1].toFixed(2)).addTo(map);

[bdullemond]

Thanks for the replies. Unfortunately I need 6 decimal places so I found a workaround of putting the source coordinates in the feature properties for future use in popups and that works well.