# Weird Scattermapbox lines behaviour **URL:** \ **Category:** Dash Python\ **Created:** [March 23, 2023, 12:57pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821 "2023-03-23T12:57:56Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 23, 2023, 12:57pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/1 "2023-03-23T12:57:56Z")
![Screenshot 2023-03-23 at 13.48.55](https://us1.discourse-cdn.com/flex024/uploads/plot/original/3X/6/b/6b353e8460284e50140beda451a8af85474d072c.png) See attached screenshot. How can I fix that weird behaviour? All coords I submit are “in the water” and at 180deg lon there’s a cutoff (they are not connected). It works perfectly fine for every set of coords which “does not cross the pacific”. Here’s the code: ```auto def update_map_fig(datastore): waypoints=pd.DataFrame(datastore) map_fig_updated = go.Figure(go.Scattermapbox( mode="lines", lon=waypoints.lon.values, lat=waypoints.lat.values)) map_fig_updated.update_layout( mapbox=dict(accesstoken="mytoken"), margin={"r": 0, "t": 0, "l": 0, "b": 0},showlegend=False) return map_fig_updated ``` ---
**Author:** ![AIMPED](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/aimped/32/21758_2.png) [@AIMPED](https://community.plotly.com/u/AIMPED)\ **Post date:** [March 23, 2023, 2:27pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/2 "2023-03-23T14:27:29Z")
If you change the `mode` to ‘markers’ are the markers plotted in the correct spots? ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 23, 2023, 2:36pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/3 "2023-03-23T14:36:52Z")
good question! Yes, the markers are on the correct spot: ![Screenshot 2023-03-23 at 15.36.01](https://us1.discourse-cdn.com/flex024/uploads/plot/original/3X/9/a/9a0deccf9ff23dc788269b88f3dd2f3d08520421.png) ---
**Author:** ![jinnyzor](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/jinnyzor/32/21194_2.png) [@jinnyzor](https://community.plotly.com/u/jinnyzor)\ **Post date:** [March 23, 2023, 2:38pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/4 "2023-03-23T14:38:38Z")
I think the lines could be an issue with how the map works. What happens when you zoom in with the lines? ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 23, 2023, 2:44pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/5 "2023-03-23T14:44:07Z")
![Screenshot 2023-03-23 at 15.41.36](https://us1.discourse-cdn.com/flex024/uploads/plot/original/3X/e/b/ebd414a6654cfa3210f70984481701a335b50508.png) ---
**Author:** ![jinnyzor](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/jinnyzor/32/21194_2.png) [@jinnyzor](https://community.plotly.com/u/jinnyzor)\ **Post date:** [March 23, 2023, 2:45pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/6 "2023-03-23T14:45:59Z")
Very strange… Might be an issue with the API for mapbox… ---
**Author:** ![AIMPED](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/aimped/32/21758_2.png) [@AIMPED](https://community.plotly.com/u/AIMPED)\ **Post date:** [March 23, 2023, 2:59pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/7 "2023-03-23T14:59:30Z")
In a scatter plot the order of the points defines the lines to be drawn. I hade something like this in the past: > [@go.Figure Scatter, tonexty not in plot](https://community.plotly.com/t/go-figure-scatter-tonexty-not-in-plot/72248/4): > > This one was interesting. Two major things I changed: make sure, that the x- values are sorted. That was the main thing. If you zoom into the center of a chart created with your initial function you will see, that the lines are zig zagged. If plotting a go.Scatter() with mode=markers the order of the points does not matter, if mode=lines it does. order the traces for the use of tonexty change some trace names aiming for a clear legend changes to be able to use numpy arrays changes in axis t… ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 23, 2023, 2:59pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/8 "2023-03-23T14:59:55Z")
that cutoff happens right at 180 deg long (and is obviously not visible until fully/max zoomed in) ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 23, 2023, 3:02pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/9 "2023-03-23T15:02:03Z")
Since this problem is exclusive to lines that go “around the world”, meaning lines that cross 180 deg lon (and I’m pretty sure the order is correct too) I don’t think that’s it ---
**Author:** ![AIMPED](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/aimped/32/21758_2.png) [@AIMPED](https://community.plotly.com/u/AIMPED)\ **Post date:** [March 23, 2023, 3:02pm UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/10 "2023-03-23T15:02:40Z")
Yeah, you might be right, just wanted to mention it 😉 ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 27, 2023, 8:40am UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/11 "2023-03-27T08:40:14Z")
So I have found out that this is in fact a feature, not a bug. Crossing the antimeridian - any tips on how to proceed? ---
**Author:** ![nikok](https://avatars.discourse-cdn.com/v4/letter/n/ec9cab/32.png) [@nikok](https://community.plotly.com/u/nikok)\ **Post date:** [March 28, 2023, 7:06am UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/12 "2023-03-28T07:06:53Z")
Here’s the solution for future reference: ```auto #waypoints is a pandas df with columns lon and lat in degrees ranging from -180 to 180 waypoints=pd.DataFrame(waypoints) diffs=np.diff(lons:=waypoints.lon.values) #the number 180 depends on your "step size", may need customization crossings_plusminus=np.where(diffs<=-180)[0] crossing_minusplus=np.where(diffs>180)[0] for plusmin_crossing in crossings_plusminus: lons[plusmin_crossing+1:]+=360 for minusplus_crossing in crossing_minusplus: lons[minusplus_crossing+1:]-=360 fig = px.line_mapbox(lat=waypoints.lat, lon=lons) ``` ---
**Author:** ![AIMPED](https://sea2.discourse-cdn.com/flex024/user_avatar/community.plotly.com/aimped/32/21758_2.png) [@AIMPED](https://community.plotly.com/u/AIMPED)\ **Post date:** [March 28, 2023, 7:52am UTC](https://community.plotly.com/t/weird-scattermapbox-lines-behaviour/73821/13 "2023-03-28T07:52:39Z")
Thanks for sharing the solution.