Yersel Lidar Verisinden 3DFin Yazılımı ile Ağaçların Göğüs Çapının Belirlenmesi

Yıl 2024, Cilt: 20 Sayı: 2, 395 - 407, 28.12.2024

Hayati Zengin

https://doi.org/10.58816/duzceod.1593528

Öz

Göğüs çapı, orman envanterinde ölçülen en yaygın ve en önemli meşcere parametrelerinden birisidir. Orman envanterinde örnek alan içerisindeki tüm ağaçların ölçümü gereklidir. Zor arazi koşullarında envanterin en basit bu işlemi bile zor hale gelmektedir. Bu nedenle gelişen teknolojinin takip edilmesi ve orman envanterine entegrasyonu önemlidir. Yersel lidar tarama ile sağlanan üç boyutlu nokta bulutu verilerinden çeşitli ölçümler yapmak ve göğüs çapı gibi ağaç veya meşcereye ait bazı parametreleri bu verilerden sağlamak mümkün hale gelmektedir. Bu çalışmada Düzce Üniversitesi Yerleşkesi’nde yer alan meşe meşceresinden alınan örnek alan içerisine giren ağaçların çapları önce klasik yöntemle çapölçer vasıtasıyla ölçülmüş ve bulunan değerler daha sonra lidar verisinden hesaplanmış değerlerle karşılaştırılmıştır. Lidar verisinde tek ağaç bazında manuel ölçümler kolayca yapılabilmekle birlikte örnek alan bazındaki çalışmalarda süreci otomatik hale getiren araçlar kullanmak verimliliği artırmaktadır. Bu çalışmada da nokta bulutundan ağaçların göğüs çaplarının belirlenmesi 3DFin yazılımı kullanılarak gerçekleştirilmiştir. Yapılan analizler sonucunda çap ölçer ve lidar ölçümleri arasında %95 güven düzeyinde anlamlı farklar bulunmadığı doğrulanmıştır.

Anahtar Kelimeler

Göğüs çapı, Nokta bulutu, Orman Envanteri, Yersel Lidar

Determination of Diameter at Breast Height of Trees from Terrestrial Lidar Data with 3DFin Software

Öz

Diameter at breast height is one of the most common and important stand parameters measured in forest inventory. Forest inventory requires the measurement of all trees within the sample area. In difficult terrain conditions, even this simple process of inventory becomes difficult. Therefore, it is important to follow the developing technology and integrate it into forest inventory. It is becoming possible to make various measurements from 3D point cloud data provided by terrestrial lidar scanning and to provide some parameters of the tree or stand such as diameter at breast height from these data. In this study, tree diameters within a sample area taken from an oak stand were calculated from the lidar data and compared with the values measured with a conventional compass. While manual measurements can be easily made on a single tree basis in lidar data, using tools that automate the process in sample area-based studies increases efficiency. For this reason, the diameter at breast height of the trees was measured from the point cloud using 3DFin software. As a result of the analysis, it was found that there were no significant differences between compass and lidar measurements at 95% confidence level.

Anahtar Kelimeler

Diameter at breast height, Point cloud, Forest inventory

Kaynakça

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