It is a difficult thing that you are attempting. Small subtle changes in reflectances caused by different acquisition dates will cause major errors to arise when using your approach. You will have to do more preprocessing of your data, in order to have your approach be reliable.
Normalizing the other years to your reference will most likely help, but it may not be enough.

Another approach would be to create training areas for each timestep and accept that the images are not directly comparable, but instead compare finished classifications. This obviously adds to the amount of user dependency and thus makes the study less reproducable.

Random Forest to estimate land use in past with Landsat
I'm looking all over google but doesn't find the way to do it. 

i've declared a custom post type (let's say 'job') with a custom hierarchical taxonomy ('activities'). 

I would also like to assign "normal" tags to my custom post type (if i have a tag 'full employment' for my classic posts, i want to assign to my job posts also). 

how can i achieve that ? 

i managed to have a custom taxonomy on several post types, but i don't know how to target post_tag and add him a post type. 

for example :

register_taxonomy( 'seasons', array('job', 'post'), $args );  


make seasons appear on classic posts and also on job posts. I would like to have 'tags' available for my job posts. 

am i clear ?

thanks,
