Method for measuring of basal area of trunks in a forest, said method based on decoding photos taken of the forest cover, wherein the method comprising steps of: using a camera (9), whose horizontal view angle value (a) is known and this value is kept constant when taking sample photos for measuring, taking sample photos (2) by means of the camera (9) of forest cover in an area to be surveyed, wherein measuring data is included in each photo (2), storing photos (2) in a database for analyzing, and wherein storing the taken sample photos (2) of the forest cover into database created in a web server, calculating in a web server the numbers of trunks from the sample photos (2) taken of the forest cover and calculating such a trunk (3) to add said number, whose breadth as pixels exceeds the limit value of pixels measured for the device performing photography.
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