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Groudnets: Warnings and Limitations update
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(Groudnets: Warnings and Limitations update)
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=== Reference material ===
=== Reference material ===
Most Civil Aviation authorities make available on the web, electronic versions of their Aeronautical Information Publication (Lookup 'eAIP') which often contains precise Airport Charts but also lists of parking stands with their precise Latitude/Longitude as well as usage (Cargo, Gate, Maintenance) and the category (radii) of aircraft they can accommodate.  
Most Civil Aviation authorities make electronic versions of their Aeronautical Information Publication available on the web (Lookup 'eAIP' or go to https://www.eurocontrol.int/articles/ais-online). AIPs contain precise Airport Charts but also lists of parking stands with their exact Latitude/Longitude as well as usage (Cargo, Gate) and the category (radii) of aircraft they can accommodate.
Gates Numbers and Airlines operating them can often be found on Airports website.
Most flight tracking sites/apps will also allow you to monitor a flight all to the way to its gate to identify who parks where.
Gates Numbers and Airlines operating them can often be found on Airports website. Most flight tracking sites/apps will also allow you to monitor a flight all to the way to its gate to identify who parks where.
 
In essence, all the information you need can be compiled from multiple sources, including Wikipedia, airport diagrams published on the net, in flight airline magazines, etc. etc. In other words, be creative!
In essence, all the information you need can be compiled from multiple sources, including Wikipedia, airport diagrams published on the net, in flight airline magazines, etc. etc. In other words, be creative!


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FG Scenery and Traffic manager have their limitations and dependencies which create specific challenges of their own. For example:
FG Scenery and Traffic manager have their limitations and dependencies which create specific challenges of their own. For example:
* TM does not space landing aircrafts. You will most likely see packs of aircrafts hitting your runways at once.  
* TM does not space landing aircrafts. You will most likely see packs of aircrafts hitting your runways at once, sometimes from both ends.  
* TM uses a separate file (ICAO.threshold.xml) to calculate where runways are ie the space between each pair of thresholds in the file. The last point of a route ending on runway must be within the two threshold for the aircraft to initiate its take-off. This is key for displaced threshold. If the route does not end within thresholds, aircrafts will simply stop and pile up at the entrance of the runway   
* TM uses a separate (ICAO.threshold.xml) file to determine where runways are (the space between each pair of thresholds in the file). The last node of a route ending on runway must be within the two thresholds for the aircraft to initiate its take-off. This is key for displaced thresholds. If the route does not end within thresholds, AI aircrafts will simply stop and queue at the entrance of the runway   
* TM does not yet use Regular/Cat III Holding Points data. You cannot force an AI aircraft to pause/hold on a route.  
* TM does not yet use Regular/Cat III Holding points data and so you cannot force an AI aircraft to pause/hold on a route.  
* TM does not support the conditional use of gates (Do not use A if B is occupied); Always assume all the Parking position you set will be occupied.  
* TM does not support the conditional use of gates (Do not use A if B is occupied); Always assume all the Parking position you set will be occupied.  
[[File:AI Traffic at KJFK former Terminal 3.jpg|300px|thumb|AI Traffic at KJFK former Terminal 3]]
[[File:AI Traffic at KJFK former Terminal 3.jpg|300px|thumb|AI Traffic at KJFK former Terminal 3]]
* AI Aircrafts cannot "pivot" on their parking positions. The last segment on a route leading to a parking position must have the same heading than the parking position itself (Park Straight)  
* AI Aircrafts cannot "pivot" on their parking positions. The last segment on a route leading to or exiting a parking position must have the same heading than the parking position itself (Park Straight)  
* Groundnets, terrain and scenery objects are independent and you may see your aircrafts rolling on grass or sitting on buildings. Before blaming your groundnet work, consider that the airport terrain/layout may be outdated or misplaced. Similarly, Building/Object may have been placed at certain Lat/Lon but since demolished (example of JFK Terminal 3 on the right) to make space for a new taxiway as airports expand and change layout regularly.
* Groundnets, terrain and scenery objects are independent. If you see your AI aircrafts rolling on grass or sitting on buildings and for as long as your groundnet lat.lon data is correct, consider that the airport terrain/layout may be outdated or misplaced. Similarly, Building/Object may have been placed at certain Lat/Lon but since demolished (example of JFK Terminal 3 on the right) to make space for a new taxiway as airports expand and change layout regularly.
 


Your candidate groundnet will need to be tested thoroughly by running it in FG, at different time of the day as wind conditions and traffic patterns will impact which runways are used and how many AI aircrafts are handled.  
Your candidate groundnet will need to be tested thoroughly by running it in FG, at different time of the day as wind conditions and traffic patterns will impact which runways are used and how many AI aircrafts are handled.  
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