That is a samples of what I need:
"J:\sp1\sp1_Thresholded_0_3.img" + "J:\sp1\sp1_A2a_2020_Thresholded.img" ==> J:\sp1\sp1_CCCMA_A2a_2020_GainLoss.img
I will repeat the previous steps more than 1000 times and it will take me huge time to run them individulaly.
I had to do similar analysis and the iterator worked great.
http://video.esri.com/watch/91/modelbuilder_dash_advanced-technologies
This video does a pretty good job at explaining some of the advanced modelbuilder tools.
Ahmed - there's a set of three really good blog posts in the ArcGIS blog that are a good help getting started with advanced ModelBuilder..
please explain for me which iteration method is best useful in my case and how to use the Calculate Value tool to generate the input and output pathnames...