Surveying is a free Android application developed by Long Tsai under the Utilities & Tools category. This app offers three surveying methods, Forward Intersection, Resection, and Intersection by Distances, that can be used to calculate the location of an unknown point by measuring angles and distances to known points.

The Forward Intersection method is used to determine the location of the unknown point by measuring angles and distances from two known points. The Resection method is used to calculate the position of an observer by measuring angles and distances to at least three known points. The Intersection by Distances method is used to find the location of the unknown point by measuring distances to two known points and their intersection angle.

This app is user-friendly and easy to navigate, making it an excellent tool for students and professionals in the field of surveying. The app does not require an internet connection, making it convenient to use in remote areas. Overall, Surveying is an excellent tool for anyone who needs to perform surveying calculations on the go.