How i can know the area or percent of area that occupies an index value in an index map?

PIX4Dmapper PIX4Dmapper Questions/Troubleshooting
1

Hi
I am studying an area of diseased culture and I need to know the percent of the area where the index values corresponding to the diseased areas are manifested. Is it possible to perform this operation with pix4d?
Thank you

2

Say you want the area of the map with index value between MIN and MAX.

You could use the Index calculator and divide the Index map into 2 classes of equal spacing (see https://support.pix4d.com/hc/en-us/articles/202560519#gsc.tab=0). For example if you are interested in the region of your field with index values between 0.15and 0.2 , we would suggest setting the min at 0.15, and the max at 0.25 (so that 0.15-0.20 will be one class). More generally, we would set the minimum to MIN, and the maximum to 

MIN + 2* (MAX-MIN). 

This way the two regions will be [MIN, MAX] and [MAX, 2*MAX-MIN]. The area of the region corresponding to [MIN, MAX] will be displayed, and this is what you are interested in. You can obtain the area of the full field at the top of the quality report for example.