Mapper Tools is a special extension for Mapper to support multispectral images align and pre-processing before stitching to orothomosaic. If Mapper tools are installed in system, this functionality is accessible in Mapper GUI with this button:
Pressing Tools button will bring Multispectral alignment tool dialog, similar to the main UI of mapper: you need to specify input and output folders and press “Start” to begin alignment:
To setup exact parameters of Alignment process Mapper brings additional tab “Tools” in Settings menu:
Here parameters affecting alignment can be set:
• Product Type. Select desired type of output data: Raw – for a copy of source raw data of each band to target channel, Radiance – convert source data to radiance values, Reflectance – convert source data to the values of reflected light.
• Reuse warp matrix – use this flag to greatly speed up processing, if your source data was taken at the same height and the same angle. If altitude is volatile while flight, you will not get an adequate result with this flag.
• Mapping specific source band (part of light specter) into the channel of output format (JPEG). You have to map bands to 3 channels.
Apply a gamma correction to leverage white balance and overall contrast of aligned images.
Enter values of calibration referrals for the Lambertian panel used for accurate reflectance measurement.
Updated 3 months ago