نوع مقاله : مقاله کامل علمی پژوهشی
نویسندگان
1 دانشجوی کارشناسی‌ارشد دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی ساری
2 دانشیار دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی ساری
3 دانشیار دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The main objective of this study was estimation of three forest biophysical
properties including volume, basal area and number per hectare using SPOT-HRG
data in district 1 Darabkola’s forest. Images were orthorectified to reduce relief
displacement errors. Different synthetic bands were generated trough principal
component analysis and suitable vegetation indices were created by rationing.
After take territorial information, accomplished calculation volume, basal area and
number per hectare values in sample plat. Since analyze normalized data,
evaluating correlation between territorial and spectral by linear regression. Cross
validation getting best correlation model investigating by some sample plat and by
relevant evaluation criterions. For volume estimation, results of this study showed
that linear combination of NIR and SWIR bands by adjusted determination
coefficient 74.5% and root mean square relative error 77.1 m
3
/ha were better
predictors than other combination. For basal area estimation, linear combination
NIR band and MSAVI2 index showed best results (R
2
adj
=80.5; RMSE=4.02).
Linear combination NIR and SWIR band by adjusted determination coefficient of
85.7% and root mean square relative error of 44.6 numbers per hectare could better
predict the number trees per hectare. Results this study showed SPOT data has high
capability for estimation biophysical properties as volume, basal area and number
per hectare. Of results this study can use for operational management forest stand.
کلیدواژه‌ها [English]
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