I have downloaded a satellite image which is showing patches of forest, barren land, and snow-covered area. The question is how can i calculate forest area, barren land, rivers and ice-covered area? If forest the which types of forest ?
Lots of help topics. What have you looked at?
Is this image classified already? If not, you will first need to carry out that classification process. If you are going down that road - you really need to define / decide upon the classes you wish to identify first.
Then, you could look at using a Zonal Statistics approach to calculate % area per class type, or even use Tabulate Area. Really depends on your desired output / workflow!