Hello,
I took the photos using a Micasense RedEdge MX multispectral camera (5 bands: blue, green, red, red edge, NIR).
I put all 5 band pictures into Pix4D mapper for 1, 2 and 3 processing and got the result.
In the ‘3_dsm_ortho’ folder I got orthomosaic images (‘project name_mosaic_blue’, ‘project name_mosaic_green’, ‘project name_mosaic_red’, ‘project name_mosaic_red edge’, ‘project name_mosaic_NIR’) in ‘2_mosaic’ folder.
These images are in grayscale, but I don’t know what the pixel values in the orthomosaic image represent.
I fund out that in https://support.pix4d.com/hc/en-us/articles/202739409-Reflectance-map-vs-orthomosaic#gsctab=0 said ‘For the orthomosaic, color balancing will also be applied. This means that Pix4Dmapper will try to adjust the intensity of the colors in each image so that the images fit better together.’
So can I say that the pixel values in the orthomosaic images are the color intensity?
But I still confused what is the relationship between the orthomosaic images and the reflectance maps.
Please tell me what the pixel values in an orthomosaic image represent and the relationship between reflectance map.
Thank you.
Hello @r11621122, For multspectral camera you should be only generating the reflectance map and each pixel represent the reflectance value. The orthomosaic should be generated for RGB camera.
Thank you for your reply. I still have two questions.
Question 1: Though I use a multispectral camera, Pix4D generates orthomosaic maps for me (I have 5 bands so I got 5 orthomosaic maps). What do the values in these orthomosaic maps represent?
Question 2: The value range of my reflectance map should be 0-1, but in reality, it is 0-23. After calibration, it becomes 0-1.44 not 0-1. Why? Is this normal?