Basal Area application is designed for simple basal area calculation by using Bitterlich method like as Relascope survey. Step 1 Take forest photos by 360 degree camera, and saved by Equi-rectangular format. Step 2 Copy the photos to smartphone Step 3 Open the file from "Basal Area" application Step 4 Compare the trunk size (1.3m height) of trees with center red circle Step 5 Tap "1.0" an case of the tree is bigger than red circle -> red mark Tap "1.0" an case of the tree is bigger than red circle -> blue mark Step 6 Read the basal area data at the bottom of screen - Count mark is deletable by tapping. - Count-marked image is savable for the evidence of survey result. - K factor is changeable (default number is 4.0) - Counting data is saved to \Android\data\com.forest.BasalArea\YYYY-MM-DD.csv file