What is the difference between the light green areas and darker green areas on Google Maps?

On Google Maps the areas colored green are usually the parks but what is the difference between areas colored light green and the areas colored with darker green? See this http://maps.google.com/maps?q=V3G+1W4&oe=utf-8&client=firefox-a&ie=UTF8&hq=&hnear=Abbotsford,+British+Columbia+V3G+1W4,+Canada&ll=49.395334,-123.192272&spn=0.093289,0.264187&z=13 you'll see both types on the map. Are the light green areas private property?