Many geometry artifacts by converting geojson to mbtiles

[TommasoDb]

Problem I'm trying to convert a polygonal dataset from geojson to mbtiles using tippecanoe.

The result has many artifacts and I cannot realize why.

My original data looks like so:

But the converted data looks like so:

The command I used: tippecanoe -f -o out.mbtiles rooms2.geojson

My original dataset: { "type": "FeatureCollection", "name": "rooms2", "features": [ { "type": "Feature", "properties": { "id": 6, "room_id": "004" }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 8.403453283460099, 49.329157256303667 ], [ 8.403450990283577, 49.329159147126497 ], [ 8.403448132450007, 49.329157653894399 ], [ 8.403430593284723, 49.32917203729729 ], [ 8.40340417955095, 49.329193698476793 ], [ 8.403399404809266, 49.329197614108942 ], [ 8.403373400881929, 49.32921893918828 ], [ 8.40336067290861, 49.329229377027382 ], [ 8.403363534038247, 49.32923086756 ], [ 8.403359148600885, 49.329234463927854 ], [ 8.403356287471185, 49.329232973395158 ], [ 8.403354873515248, 49.329234132938517 ], [ 8.403329170726924, 49.329255211021085 ], [ 8.40332508765044, 49.329258559426933 ], [ 8.403299320605973, 49.3292796901762 ], [ 8.403269284732854, 49.329304321628399 ], [ 8.403267881577966, 49.329305472309748 ], [ 8.403270731016642, 49.329306956753278 ], [ 8.403266403308367, 49.329310505764724 ], [ 8.403263553869619, 49.329309021321052 ], [ 8.403203226914567, 49.329358493402836 ], [ 8.403206005001534, 49.329359923782285 ], [ 8.403202903289671, 49.329362467387149 ], [ 8.403260687641538, 49.329392219320731 ], [ 8.403233667919281, 49.329414377251382 ], [ 8.403173326560191, 49.329383308758722 ], [ 8.403018866187862, 49.329509680541427 ], [ 8.403021771252128, 49.32951119171554 ], [ 8.403019449696146, 49.329513097887514 ], [ 8.40311706036411, 49.32956387350697 ], [ 8.403136687258012, 49.329547758319713 ], [ 8.403142710888288, 49.329550891715932 ], [ 8.403151761386958, 49.329555599639363 ], [ 8.403181595959525, 49.329571262862736 ], [ 8.403190691198089, 49.329575850281039 ], [ 8.403211471350222, 49.329586659759137 ], [ 8.403212380490388, 49.329585913283957 ], [ 8.403220425338986, 49.329579307833015 ], [ 8.403223530155016, 49.329576758535183 ], [ 8.403248226403534, 49.329589531079122 ], [ 8.403252381222535, 49.329586123869859 ], [ 8.403278565480276, 49.32956467498159 ], [ 8.403328283128367, 49.329590303955996 ], [ 8.40333081408072, 49.329588239030016 ], [ 8.403355703857589, 49.329567827813619 ], [ 8.403352838375501, 49.329566335023401 ], [ 8.40335711377689, 49.329562828917425 ], [ 8.403359979258923, 49.329564321707544 ], [ 8.403403167302926, 49.329528904676458 ], [ 8.403414546807989, 49.329519572724102 ], [ 8.403419521103977, 49.32951549346847 ], [ 8.403430767883089, 49.329506270353569 ], [ 8.403448462348031, 49.329491759693646 ], [ 8.403445668446791, 49.32949029991925 ], [ 8.403449981595475, 49.329486762843594 ], [ 8.403452801314204, 49.329488236061408 ], [ 8.403513042960842, 49.329438833735807 ], [ 8.403510266895989, 49.329437387530461 ], [ 8.40351480675174, 49.329433664528928 ], [ 8.403517582816512, 49.32943511073416 ], [ 8.403520966111778, 49.329432336193129 ], [ 8.403532199026941, 49.329423124406361 ], [ 8.40353720699577, 49.329419017515455 ], [ 8.403548577372504, 49.329409692993785 ], [ 8.403605748532184, 49.329362808485364 ], [ 8.403602997431589, 49.329361375286688 ], [ 8.403607485302523, 49.329357694901326 ], [ 8.403610244659111, 49.329359132400945 ], [ 8.403620116408087, 49.329351025763685 ], [ 8.403642299808006, 49.329332833719185 ], [ 8.403649316814512, 49.329327079246141 ], [ 8.403659237442547, 49.329318943582052 ], [ 8.403676646499255, 49.329304666832392 ], [ 8.40369774228842, 49.329287366667167 ], [ 8.403695147283164, 49.329286010776727 ], [ 8.403697411763886, 49.329284162588799 ], [ 8.403577686062146, 49.329221598280974 ], [ 8.403575277565649, 49.329223564005574 ], [ 8.403569995260778, 49.329220803988001 ], [ 8.403572387542743, 49.329218851497281 ], [ 8.403453283460099, 49.329157256303667 ] ] ] } } ] }

[guyanf]

if a tile has an extent of 4096, coordinate units within the tile refer to 1/4096th of its square dimensions.

so if the distance of the neighbouring points are too small, those will be discard。

[TommasoDb]

Hello @guyanf , thank you for the help. I had satisfying results using the option -d, for example -d 25. Issue is resolved for me.

[e-n-f]

Oh good, glad you got it working!

In general the recommendation is to use a higher --maximum-zoom instead of a higher --full-detail, since many renderers have a limit on the detail they can accept.