We are using UAV multispectral data acquired by a Micasense RedEdge-M camera for mapping the concentration of suspended sediments and distribution of aquatic vegetation in shallow estuarine waters and are wondering if there is simple way to automatically georeference the data using Agisoft Metashape or any free software, while keeping the original pixel value.
Dear you can use GCPs or Image to image and/or map to image georeferencing
regards
Hi Hayder Dibs , I was thinking on an automatic way for georeferencing the aerial pictures, as there are no features on the water surface to be used as GCPs.
Use the data from the of the planned mission and do through the Agisoft software unsupervised georeferencing.
Thank you Richard Gloaguen and John Hatzopoulos for your inputs...unfortunately we are not using a RTK for accurate positioning, and I would not rely on Log File of the planned mission, as it was planned for the Phantom 4 UAV, but the pictures we want to join in a big raster file (like a mosaic) are acquired by a Micasense RedEdge camera attached to the phantom using a rigid support, not a gimbal.
Please, let me know in case you have an insight on how to proceed using Agisoft Metashape or an open source software.
Cheers,
Jorge
Thank you Richard Gloaguen for your suggestions! We will have a try and I give here an update on the solution we hopefully find for the problem.
And please, I would be very happy to discuss any alternatives if someone else has any experience with georeferencing of aerial pictures acquired over water surfaces.
Hi, the best way is creating automatic 3D imaging from the area and use center of image geographic position for georefrencing. Your flight plan should be done by fore example dron deploy, pix4d capture or .....in such cases using ppk/Rtk based method can simply improve your geolocation tags using DGPS methods!
With no possibilities to recognize features on sea surface to use as GCP's the only way that i know is to employ an UAV with RTK receiver.
A good (and the only) open source code able to carry out the whole photogrammetric process and letting you fully customize it is MICMAC.
Thank you Matteo Cutugno , I will try MICMAC and compare its results with Agisoft Metashape....and BTW, I am still looking for a good approach for georreferencing aerial pictures taken by a low-cost UAV without RTK receiver.
Hi Ghasem Askari , will try your suggestion...but using such approach the resulting georreferenced pictures will have a good accuracy only in them central parts. Isn't it?
Hi, in such cases you would better to use RTK /PPK systems, any way if not possible, you have chance to flight sevaral time from the same area but with different picture centers, then combine all pictures to achieve better accuracy of your picture. in my opinion pix4d can handle your data in enough precision. remember you need a supercomputer to proccess such huge data. if you have not access to such computers, our team will help you for processing step. good luck
Dear Jorge,
Maybe it can be the solution to your georeferencing problem over water surfaces:
--> https://klauppk.com/software/
Best !
Hello. The easyest way here is to use RTK or PPK technologies. Also you can try to encorporate an inertial system into your drone bundle, combining with gnss it can give a solid results and high positioning accuracy.
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