We added the link of the article that we indeed forgot, thank you!
Regarding the maximum area that can be covered in one single mission, the limiting factors are:
- Altitude and overlap (the higher the less overlap required, meaning fewer lines in the grid, and vice versa).
- Size of the grid (length of the flight track).
- Distance to the home point if the drone is connected.
Actually the color of the grid refers to the estimated flight time that is calculated given the factors above assuming the battery is fully charged at the beginning of the mission. Note that even if the color is yellow or orange it is still possible to fly the mission.
Regarding the other comments:
- For double grid missions, the camera angle cannot be vertical. The angle is adjusted to optimize the image acquisition. Tha camera angle can be changed in the flight settings if needed for the simple / double grid and polygon missions.
- The order of the flight lines is optimized in terms of battery and also depends on the home point location. It might sometimes look a bit strange.
- After checking with our devs, the drone is actually expected to fly backwards during polygonal flight.
- The latest version now overrules the pilot mode of the drone. In other words, even if the button is in the S position, the app still activates the P mode for flying a mission.
The save option will come very soon on iOS. It is a top priority.
Note however, even if you close Pix4Dcapture, force quit Pix4Dcapture and even reboot the device, the flight plan that you designed will remain on the Map view when re-opening the app. In other words, only one mission can be saved.
Regarding the base map, the background is automatically cached for 2-3 days depending on how the temporary memory of the device is used. You can take advantage of these temporary background maps to plan flights without Internet connection.
It is not possible to fly large areas with the iOS version of the app at the moment because the resume option is not available yet. It is however, in our pipeline to implement multi-battery flights but it takes some time. Rest assured that our developers are currently working on it. It might be ready by the end of June as a rough estimation.