tailieunhanh - Báo cáo lâm nghiệp: "Assessment of some forest characteristics employing ikonos satellite data"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Assessment of some forest characteristics employing ikonos satellite data. | JOURNAL OF FOREST SCIENCE 53 2007 8 345-351 Assessment of some forest characteristics employing IKONOS satellite data t. Scheer R. Sitko Faculty of Forestry Technical University in Zvolen Zvolen Slovak Republic ABSTRACT In recent years satellite remote sensing has become a new tool for estimation of forest condition. The paper deals with spruce timber growing stock and vegetation cover assessment employing IKONOS satellite data from a mountain forest area of Central Slovakia. Original digital data as well as enhanced digital images were used to estimate some forest variables. Image enhancement approaches employing topographic normalization PCA analysis and different vegetation indices are a very important part of data processing. Apart from spectral characteristics texture as an additional variable was utilized. In order to improve classification accuracy the knowledge of the vertical distribution of tree species also was incorporated into classifiers. Spectral signatures as auxiliary variables measured with the aid of training sets were utilized for the construction of spectral models for growing stock estimation. In spite of the fact that the standard error of these models is not very favourable as it varies about 30 they offer initial information for application of different sampling designs for timber growing stock assessment where the final precision is acceptable. Stepwise discriminant analysis was employed to choose appropriate sets for the classification of vegetation cover. Classification results show an assumed contribution of categorial knowledge for increasing the correctly classified pixel proportion and this improvement was on average about 10 . Likewise the texture contributes to better resolution of some very near spectral classes. Keywords IKONOS timber growing stock texture categorial knowledge vegetation cover A lot of applications have been developed recently for the forest inventory and monitoring employing LANDSAT TM and SPOT satellite data. .