llkatransport.blogg.se - Agisoft metashape 1.7

The reflectance is not changing much with different bandwidth however – so this can be neglected with professional calibration targets and is likely buried in other uncertainties). (Micasense Rededge band specs are close to P4M camera specs but not identical so using the RE values with a Micasense panel should work somehow but here more accurate values might be needed. For each channel insert the right reflectance values (0.518 f.e.) that are specific for your panel and your band setup in the”Calibration Reflectance” tool. Locate the panel files automatically or move the panel tiffs manually into a Group Folder under “Cameras” and rename the folder to “Calibration images”.

Locate the reflectance panel tiffs using “Tools-> Calibrate Reflectance”.

Agisoft will not use the RGB Jpegs by default but you could create an additional “Chunk” for the RGB data and merge the products later. Choose “Add Photos” as “Multi-camera system”.

Import all Geotiff folders with the multispectral tiff files.

Although … reflectance calculation is usually done to get a value for absolute comparison of spectral information with reflectance spectra or other datasets. Since vegetation surfaces do not fully reflect light in lambertian style this does not always fully work, but we can get close when the illumination directions of the different flight campaigns are comparable and when relative change is needed. the panel reflectance measurement is used to make different multispectral data measurements from different campaigns comparable by converting DNs to reflectance. sensor works for normalizing the within flight campaign variations while 2.

Here a short summary for Agisoft Metashape 1.7.2 with a 50% reflectance panel from Micasense (update: now its from SphereOptics). There was some confusion in the past on how to process the Phantom 4M Multispectral data to “reflectance” level. DJI Phantom 4M(ultispectral) camera system (channels 1-5 and RGB camera)