• Aerial Photographs (APs) is a perspective projection of earth’s surface while map is its orthographical projection.
• AP provides images on a photographic film or paper
• It shows actual images of objects found on earth and ground features
• Scale of APs vary from place to place even in the same photograph
• It records all ground objects whether wanted or not for aspecific purpose. So, unwanted details may obstruct to perceive wanted details
• It can be subjected to rough or quick study which isreceived on ground
• It provides 3-Dimensional view of the earth’s surface andobjects on it.
• It facilitates selection of best locations for many purposessuch as road alignment, bridge and dome sites, forest destruction, etc
• It has to be studied and interpreted under a stereoscopicand/or with certain aids and instruments

Classification

APs can be classified on the basis of :

1. Film used
2. Device use
3. Scale of photograph
4. Position of optical axis of camera

Time of photography

Ideal time of photography: 9-11 am & 1-2 pm. Other times are not suitable to maintain accuracy because morningSun is not risen well and shadow of hills and trees are longer and Noon: Very high sun increase chance of hot spot so image be blunt. Condition of the weather cloudy as well

Season of photography

October to February

• Coniferous forest - October-November
• Mixed forest - December -February
• Sal tropical forest - Mid march –mid April
• Tropical evergreen forest - January-February