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Topics - jgrn307

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General / Align to existing digital orthophoto?
« on: March 25, 2017, 11:00:11 PM »
Is there a trick to letting a set of collected photos choose tie points against an EXISTING orthophoto (e.g. a DOQQ) to avoid needing ground control points? 

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General / DEM of Top of Canopy?
« on: March 25, 2017, 08:07:18 PM »
Photoscanners:

I'm trying to generate a canopy height model which is the top of canopy elevation minus the terrain elevation.  The terrain elevation is easy enough, but is there some way to export a DEM of the HIGHEST points for a given region (the top of the plants -- all points, not just ground points)?  Thanks!

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Folks: I'm new to the drone-based photogrammetry world.  I'm trying to determine the best flight planning software that will work with a DJI Mavic Pro with an Android phone.  Pix4DCapture works well enough, but it doesn't allow me to capture photos in "RAW" mode, only a reduced-quality JPG which I'm finding is causing distortions in my images.  Does anyone have any recommendations for a good flight planning/autopilot that works for decent 3D photogrammetric purposes?

Alternatively, is there a trick to getting Pix4DCapture to collect RAW images (or, minimally, increase the quality of the JPGs?)

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