Precent overlap
Ill start off with I am still new and learning for drone mapping. I am needing to sample an area- I do not want total coverage or overlap. Ideally, I want to video 70% of my point of interest (100-ac sections). For this, I would assume 0% overlap would result in 100%(ish) coverage. I am needing less than that. I cannot get my mapping parameters to less than 5%.
I may be misunderstanding overlap- however, I only want my flight path to cover 70% or less or my area.
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6 comments
Since your recording video I’d suggest trying it and see what it looks like. I don’t see any issue unless you’re capturing photos for stitching which would be very different.
i've never mapped using video, when mapping with stills, i set my overlaps to 80% front and sides
I am a wildlife biologist and i use my thermal drone to estimate deer populations. I section off the property into smaller sections (about 100ac) in which i run a grid pattern to scan for animals. I then go back and review video footage on my computer to mark individuals- which gives me a "bottomline population estimate". Since I am doing population estimates, I cannot risk sampling the same group of animals twice. I would rather have a low population estimate rather than a high one (for my situation). So, it is ok if I miss animals, but it is not great if I sample a group of animals more than once.
For my previous flight surveys, I measured my assumed field of view using the drone and ground footage. I then used a regular land mapping system to lay my grid lines for the drone to fly (creating an estimated 70% coverage of each section using my ground footage FOV). Created a KML then uploaded to litchi. I really need something more precise and accurate for my clients- but I am having a heck of a time finding a fight planning program for what i need.
I guess "mapping" was not the best terminology! I do apologize for that!
I'll start by saying I've never used DL for that purpose. I'm not sure why video would be better than photos.
But...if you ran a mapping mission using photos and processed it using mapping software (e.g. webODM) it would merge the photos, not duplicate. If you are using something like a Mavic 3E then it can take RGB photos and Thermal photos at the same time, so you could process both into maps, use the thermal to identify areas of interested, and then the RGB to actually view it. If you need details then WebODM allows you to easily go to the photos used to create that part of the map for a better look, which might help identify if you have a duplicate caused by animals moving around.
I am not sure if photos would work? Since the animals are under trees I often just have a second or two that I can see it if my tree canopy cover is dense as the drone flies over. I also use the animals movements to identify between hogs and deer
Just like to add that these drones aren’t that accurate. If set to the lowest value at 5% it may be more or less depending on several factors like the accuracy of the drones and its components, the wind, altitude, speed, etc. They are just not that precise. Also when setting up the plan there is no way to be that precise when using the maps in the Web app. In your situation it would work about as good as it can based on all the factors. I would guess it’s better to have a very small amount of each section on each leg rather than missing any of it. Just some things to consider. Sounds like interesting work.
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