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För att kunna animera trips skapar jag approximativa shape_dist_traveled i shapes och stop_times och stöter ibland på konstigheter.

Exempel 1
Data: GTFS3 Sweden, 20230203

Trips med shapes där 1 stop inte hittas i shape (distnotok är antalet stops som inte hittats i shape även med generösa toleranser när jag kopplar ihop dem, enligt https://developers.google.com/transit/gtfs/guides/best-practices ska stop ligga högst 100 m från shape):"agency_id","agency_name","cnt","distnotok","distok","route_id","route_short_name","shape_id","trip_id"
"505000000000000023","Länstrafiken i Jämtland AB","50","1","49","9011023005600000","56","1232300000000001285","232300000000001285"
"505000000000000023","Länstrafiken i Jämtland AB","52","1","51","9011023005600000","56","1232300000000001281","232300000000001281"
"505000000000000023","Länstrafiken i Jämtland AB","58","1","57","9011023005600000","56","1232300000000001283","232300000000001283"
"505000000000000023","Länstrafiken i Jämtland AB","58","1","57","9011023005600000","56","1232300000000001284","232300000000001284"
"505000000000000023","Länstrafiken i Jämtland AB","60","1","59","9011023005600000","56","1232300000000001276","232300000000001276"
"505000000000000023","Länstrafiken i Jämtland AB","60","1","59","9011023005600000","56","1232300000000001282","232300000000001282"
"505000000000000023","Länstrafiken i Jämtland AB","64","1","63","9011023005600000","56","1232300000000001279","232300000000001279"
"505000000000000023","Länstrafiken i Jämtland AB","65","1","64","9011023005600000","56","1232300000000001287","232300000000001287"

Felet är ett extra stop i Korskrogen, nummer 25 i första trip:en ovan, liknande i övriga trips. Ser ut som att shapen följer huvudvägen men stoppet ligger inne i byn.
"departure_time","route_id","shape_dist_traveled","shape_id","stop_lat","stop_lon","stop_name","stop_sequence","trip_id"
"11:30:00","9011023005600000","0","1232300000000001285","61.826556","16.098369","Ljusdals resecentrum","1","232300000000001285"
"11:31:08","9011023005600000","640.6","1232300000000001285","61.829401","16.089780","Ljusdal Riotorget","2","232300000000001285"
"11:32:07","9011023005600000","1198","1232300000000001285","61.828611","16.080910","Ljusdal Åkersta","3","232300000000001285"
...
"11:46:29","9011023005600000","17767.2","1232300000000001285","61.800386","15.799965","Smens","20","232300000000001285"
"11:46:54","9011023005600000","18289.566667","1232300000000001285","61.802234","15.791299","Snasbäcken","21","232300000000001285"
# Korskrogen korrekt
"11:48:39","9011023005600000","19634.9","1232300000000001285","61.810822","15.754556","Korskrogen","22","232300000000001285"
"11:50:21","9011023005600000","23190.15","1232300000000001285","61.839292","15.751451","Töva","23","232300000000001285"
"11:51:44","9011023005600000","25210.85","1232300000000001285","61.856805","15.745645","Steget","24","232300000000001285"
# Korskrogen "extra"
"11:52:26","9011023005600000","null","1232300000000001285","61.810822","15.754556","Korskrogen","25","232300000000001285"
"11:52:47","9011023005600000","26686.866667","1232300000000001285","61.867979","15.730840","Hovra,Vandrarhemmet","26","232300000000001285"
"11:53:38","9011023005600000","27888.3","1232300000000001285","61.876989","15.718310","Hovrahällarna","27","232300000000001285"
...
"13:05:00","9011023005600000","110787.722727","1232300000000001285","62.035648","14.352773","Sveg järnvägsstation","50","232300000000001285"


Exempel 2
Alla shapes från Snälltåget/505000000000000662 ser felaktiga ut, de återanvänder stops som shape points förutom två shapes som dock är interpolerade punkter längs raka linjer mellan stops. Jag tycker inte att någon av dessa shapes bör tas med eftersom de inte visar en shape (se exempelbild nedan).
Även shapes med en (1) punkt förekommer. Gissningsvis optimeras upprepade punkter i shapes bort och eftersom koordinaterna är (0,0) för platser där information saknas blir det endast en kvar. Jag tycker att shapes med färre än 2 punkter inte bör förekomma.
Shapes med endast 2 punkter bör endast förekomma om de är korrekt återger en shape (osannolikt men kan teoretiskt set förekomma), förekommer även bland andra operatörer.

Trips med shapes som är 1 punkt långa:
"agency_id","agency_name","cnt","distnotok","distok","route_id","route_short_name","shape_id","trip_id"
"505000000000000662","Snälltåget","2","2","null","9011662003700000","BOK","1747400000000001281","747400000000003162"
"505000000000000662","Snälltåget","2","2","null","9011662003700000","BOK","1747400000000001281","747400000000003151"
"505000000000000662","Snälltåget","2","2","null","9011662003900000","BOK","1747400000000001283","747400000000003168"
"505000000000000662","Snälltåget","2","2","null","9011662003900000","BOK","1747400000000001283","747400000000003153"
"505000000000000662","Snälltåget","2","2","null","9011662004000000","BOK","1747400000000001284","747400000000003169"
"505000000000000662","Snälltåget","2","2","null","9011662004000000","BOK","1747400000000001284","747400000000003154"
"505000000000000662","Snälltåget","2","2","null","9011662004100000","BOK","1747400000000001285","747400000000003177"
"505000000000000662","Snälltåget","2","2","null","9011662004100000","BOK","1747400000000001285","747400000000003166"
"505000000000000662","Snälltåget","2","2","null","9011662004100000","BOK","1747400000000001285","747400000000003155"
"505000000000000662","Snälltåget","2","2","null","9011662004200000","BOK","1747400000000001286","747400000000003156"
"505000000000000662","Snälltåget","2","2","null","9011662004300000","BOK","1747400000000001287","747400000000003182"
"505000000000000662","Snälltåget","2","2","null","9011662004300000","BOK","1747400000000001287","747400000000003157"
"505000000000000662","Snälltåget","2","2","null","9011662004400000","BOK","1747400000000001288","747400000000003158"
"505000000000000662","Snälltåget","2","2","null","9011662004500000","BOK","1747400000000001289","747400000000003159"

Exempel för trip 747400000000003162:
"departure_time","route_id","shape_id","stop_id","stop_lat","stop_lon","stop_name","stop_sequence","trip_id"
"10:20:00","9011662003700000","1747400000000001281","9022050067968001","0","0","St Johann im Pongau","1","747400000000003162"
"10:40:00","9011662003700000","1747400000000001281","9022050059747001","0","0","Wagrain, Parkplatz Grafenberg","2","747400000000003162"

"shape_dist_traveled","shape_id","shape_pt_lat","shape_pt_lon","shape_pt_sequence"
"0","1747400000000001281","0","0","1"

Malmö-Duved trip_id 747400000000003142. 13 stops, 13 shape points.