as I said, if the method to derive the binary images produces unreliable results, you cannot use them for change detection.
So it’s right but for another I’ve images done those steps,for 17-18 too.
I’ve done the steps two time but the outputs are the same
I have a question,
I’ve finished the all steps for four years(four images)
According to steps we’ll have three images :
I know that I’ve made an image with mean and difference bands
But the binary image how have been created exactly ?
is it possible that 17-18 image buildings will be more than 17-20 ?
In my opinion" 17-20 image buildings should be more than 17-18 image buildings"
Is that right???
Honestly, how can I know? I don’t know your exact steps, nor do I know the city.
You are responsible for your workflow and the study area yourself.
But yes, the growth rate from 17-20 (three years) should be larger than from 17-18 (one year).
so i’ve sent for you the images,any thing no matter
profasser i should type a thing for the place of question mark it cannt be empty , can it be ‘or’?
- img1 == 0 and img2 == 0 and img3 == 0
- img1 == 0 and img2 == 1 ?
img2 == 0 and img3 == 1
- img2 == 0 and img1 == 1?
img3 == 0 and img2 == 1
- img1 == 1 and img2 ==1 and img3 ==1
with OR you indicate that there was growth between one of both periods.
AND does not make sense to me here.
For general changes, I can extract the differences between pairwise images and put the results together,yes