Here are list of feature that are ONLY available with 4 season pack:
Spring flower blossoms in all cities.
Flower fields in many parts of the world, UK, Japan, Africa, Asia, Europe, USA
More variety of trees and colors in each season.
Gradual transition of trees in different elevations.
Customized trees in upper UK and Scotland areas - Removed/reduced all vegetation from higher elevations.
Photogrammetry trees removal from cities (ongoing project)
Terrain Mask
Snow mask so roads and runways can be cleared of snow in winter.
Multi ecosystem in the same area which is only doable with SDK, resulting in a variety of trees in the same area and creating lush forests, smooth transition.
60 fall color sets with much more variety of colors instead of 3 preset ones.
Live correction of fall tree colors by using live cam available in several countries.
3d leafless winter trees in several cities
3d Joshua trees in Joshua National Park
3d Pinus Sylvestris trees
3d Blood Dragon trees
3d Plumeria trees in Honolulu, Hawaii
3d Rhododendron trees
3d baobab trees
3d bamboo trees
3d banana trees
Florida 3d Mangrove trees
Black Forest in Germany
Black Forest in Colorado
Custom fall trees in the Rocky Mountains.
Customized fall season in Florida to remove fall colored trees.
Famous Hills in China by Li River
Rocky cliff islands and in China
Manually corrected vegetation in 1000's regions which cannot be fixed by only using biomes.
Cleared trees in 100's of runways.
Accepting changes by user's request.
Adding exclusions to work with 3rd party airports.
Instant support and frequent updates and continuously adding new features.
Auto season every 45 days with new software