I have just got Litchi and am excited by the possibilities offered by waypoint flying using MissionHub.
I have watched the excellent tutorials made by Husky-Flies on youtube so am confident I know how the system works but am a bit concerned about handing over control to the software so would be grateful if experienced users could answer my queries.
Firstly, how accurate is Google Earth ? I realise that the GPS position that the Mavic gets is very accurate but how much can I rely on the position that Google earth gives to each waypoint ? If flying higher than any hazard then any differences caused by projection errors etc are not very relevant but how much safety margin should I build in when flying past a hazard at low level ?
Secondly I don't know where Google earth gets it's elevation data from. If it is from other surveyed mapping then presumably it will be accurate but I don't know how the Mavic gets its height data. I have never really trusted any GPS derived altitude but maybe it uses a barometer but even so that would need to take the current air pressure into account. I have a feeling that it would be prudent to build in a big safety margin but maybe I am wrong. It could be that GPS can now produce accurate height info.
Thanks for any advice from Litchi users and any other tips about planning safe flights would be appreciated.
I have watched the excellent tutorials made by Husky-Flies on youtube so am confident I know how the system works but am a bit concerned about handing over control to the software so would be grateful if experienced users could answer my queries.
Firstly, how accurate is Google Earth ? I realise that the GPS position that the Mavic gets is very accurate but how much can I rely on the position that Google earth gives to each waypoint ? If flying higher than any hazard then any differences caused by projection errors etc are not very relevant but how much safety margin should I build in when flying past a hazard at low level ?
Secondly I don't know where Google earth gets it's elevation data from. If it is from other surveyed mapping then presumably it will be accurate but I don't know how the Mavic gets its height data. I have never really trusted any GPS derived altitude but maybe it uses a barometer but even so that would need to take the current air pressure into account. I have a feeling that it would be prudent to build in a big safety margin but maybe I am wrong. It could be that GPS can now produce accurate height info.
Thanks for any advice from Litchi users and any other tips about planning safe flights would be appreciated.