Markers are not positioned correctly when going offline

Question

Hi,

I am currently trying to draw markers on top of an offline tilemap provided by a tpk file. The problem is, the position of the marker is different from the actual lat lon. I have setup the lat lon of the marker somewhere in a city on top of the offline tilemap (I have checked that the lat-lon is valid), but it shows up on the sea (or grids. Anyway, it is outside the tilemap).

The strange thing is, when I use network connection, the marker shows with the correct position on the map.

I have been wrecking my brain for a day to solve this.

Thanks before

JasonChristian · Answer

I have 4 TPK files whose bounds are intersecting with each other. I can assure you, based on the MapView display and my current coordinate, that they are placed correctly.If I load the TPK files with online basemaps, it will surely display the correct location of the markers (because there is a network connection)

AlexanderNohe1 · Answer

Can you ensure that the TPK shows in the correct location?  Are you able to load the TPK at the same time as the online basemap to see if it is placed correctly?

JasonChristian · Answer

The marker was showing up in the correct location when it's online.

The projection was done correctly. I have always transformed the lat-lon values into the map's spatial reference (using GeometryEngine.project()). The problem was that the map might not be (or is currently initializing) initialized with offline features due to huge size of tpk file (over 600MBs). Therefore, it might cause the projection to fail and the transformed lat lon falls back to the default/invalid coordinate ( the coordinate that shows up on top of the sea southwest of the Africa continent). When I added a small 1s-ish delay, it shows up on the correct position

Not only markers, but map centering (MapView.centerAt() method) does not work when the map is still initializing (with offline features)

I had an offline tpk file of Darmstadt city, Germany, and was trying to put a marker on top of Luisenplatz