You'll probably need to use WebODM in conjunction with some other software (for example QGIS) to get to the product (-s) you need/want, depending on what you're doing.
Of course, the rabbit hole gets deeper. To be able to validate / rectify your 2D/3D imagery/models you'll need Ground Control Points (GCP's) that are accurately recorded, you'll need good aerial markers like this
or like this
but the marked ones are probably preferable (also consider the carrying bag with pegs
, it's very handy), nothing stops you from making your own though. From what I can tell EMLID
has the most cost effective survey grade GNSS solutions on the market, check them out, especially their forum
as sometimes you'll find 2nd hand gold there. If you're using the Inspire 1 or Inspire 2
you'll need 2x Reach RS units (they're older but useful) or 2x Reach RS+ units, the Reach RS2 is an option (currently the latest and greatest they have on offer) but it can get pretty expensive then. Get either two rover poles with the steadies, or 1x rover pole with a tribrach for the two GNSS (base & rover) units.
If you're using a camera that doesn't have a mechanical (leaf) shutter (Inspire 2
x4s has mechanical shutter and is 20MP, so win/win situation if you use that camera) you should consider planning missions carefully as the motion blur will distort your product, fly no faster than 5m/s set shutter speed to 1/1000, preferably stop at each picture location. Check overlaps, generally 70/70 should be considered minimum overlap, most people prefer 75/75 but it seems WebODM likes 83/83 overlap for best results. Rolling shutter cameras can be used, but it slows down the process by a lot and can introduce additional problems if you're not careful. Hence why the Phantom 4 Pro V2 (20MP mechanical shutter camera) is so popular for this application.
Your camera angle settings will differ depending on whether you're only doing an orthomosaic or if you have structures to record. So will your flying patterns for the various kinds of missions.
*** EDIT ***
WebODM has a "Lighting" version these days, this makes use of AWS from what I can tell and isn't really free any longer as the server time needs to be paid, stick to the regular local install WebODM if you're wanting to minimize expenditure.