frontend: Survey planning match QGC functionality when outlining area - vertex distance overlay

[vshie]

Current behaviour

Current you can drag survey area corners around the map, but no size or position context is given - it is therefore difficult to be precise when planning a survey on a known location or of a known area.

Expected or desired behaviour

Overlay distances between all vertexes when moving any vertex

Prerequisites

• I have checked to make sure that a similar request has not already been filed or fixed.

[rafaellehmkuhl]

This + area calculation + estimated time (based on set speed and without wind).

@vshie @Williangalvani @joaoantoniocardoso are you guys aware of any model for estimative of boat speed on wind that is acceptable and not so complex?

[joaoantoniocardoso]

are you guys aware of any model for estimative of boat speed on wind that is acceptable and not so complex

I didn't explore much this part in my thesis, but the simplest option I can think of is the following:

$$ V_{boat}(t) \approx \sqrt[3]{K P_{motor,in}(t)} $$

where:

$$ K \propto \frac{1}{ \frac{1}{2} C_{friction} \rho S } \eta_{motor} $$

The interference of the wind/water is totally out of the scope of my experience... My first thought would be something like:

$$ V_{boat,real}(t) \approx V_{boat}(t) - f\left( V_{wind}(t) \right) - f\left( V_{water}(t) \right) $$

These functions f can be something like:

$$ f(x) = c x $$

where c is some geometry-related coefficient.

For me, this last part would perform very badly, as the drag would depend a lot on the angle of the forces because of the complex geometry...

Now.. is this simple?

[vshie]

that seems radically more complicated then we should do?? I would simply assume a constant speed over ground, because after all we're running a vehicle that works to maintain the waypoint speed! So it's just a matter of dividing total distance by waypoint speed - our pivot turns don't add much time. If it takes longer than that, your battery was low enough, or the conditions crazy enough, that vehicle could not maintain speed!

This issue was more about making the tool give useful feedback to the user about the size of the area they were mapping....

[joaoantoniocardoso]

hahahah that makes a lot of sense -- if the boat is powerful enough to navigate the conditions and has a velocity control loop (which it does), then the wind/current speeds shouldn't affect the boat, then, it's just a matter of speed = distance / time :)

[rafaellehmkuhl]

Totally @vshie. My bad for distorting the topic of the issue 😅