Erfani Fard, S., Zobeiri, M., Feghhi, J., Namiranian, M. (2007). Estimation of crown cover on aerial photographs using shadow index (case study: Zagros Forests, Iran). , 15(3), 288-278.
Sayyed Yoosof Erfani Fard; Mahmood Zobeiri; Jahangir Feghhi; Manoochehr Namiranian. "Estimation of crown cover on aerial photographs using shadow index (case study: Zagros Forests, Iran)". , 15, 3, 2007, 288-278.
Erfani Fard, S., Zobeiri, M., Feghhi, J., Namiranian, M. (2007). 'Estimation of crown cover on aerial photographs using shadow index (case study: Zagros Forests, Iran)', , 15(3), pp. 288-278.
Erfani Fard, S., Zobeiri, M., Feghhi, J., Namiranian, M. Estimation of crown cover on aerial photographs using shadow index (case study: Zagros Forests, Iran). , 2007; 15(3): 288-278.

Estimation of crown cover on aerial photographs using shadow index (case study: Zagros Forests, Iran)

تحقیقات جنگل و صنوبر ایران
Article 9, Volume 15, Issue 3 - Serial Number 29, October 2007, Pages 288-278    PDF (563.98 K)
Document Type: Research article
Authors
Sayyed Yoosof Erfani Fard* 1; Mahmood Zobeiri2; Jahangir Feghhi3; Manoochehr Namiranian4
1Ph.D. student, Faculty of Natural Resources, University of Tehran
2Professor, Faculty of Natural Resources, University of Tehran
3Assistant Professor, Faculty of Natural Resources, University of Tehran
4Associate Professor, Faculty of Natural Resources, University of Tehran
Abstract
     Crown cover factor is an important criterion to study changes and forest monitoring in Zagros region. Regarding to the structure of these forests that is mostly coppice with standard and can't produce industrial wood, the stand volume and basal area are not suitable factors for different studies and researches in the forests. As the forests are widespread, using aerial photographs in Zagros region is common because of its low cost and fast operation (comparing to field work). However, shadow makes it difficult to measure crown cover on aerial photographs. In this research it is aimed to offer a suitable method to determine shadow index to estimate crown cover. In Kohgiloye-BoyerahmadProvince, a 30 ha plot in Servak forests near Yasuj was chosen as the study area. The crown cover was measured on the ground using 30 circular 1000 m2 sample plots in a systematic random grid (100×100 m). The ortho-photo of the study area was obtained and classified by Minimum Distance to Mean, Maximum Likelihood, Parallelepiped and CLAPA methods into two classes of forest (crown cover with shadow) and non-forest. The crown cover of each sample plot was measured. The average of crown cover on the ground divided by crown cover with shadow on the ortho-photo is the shadow index of each classifying method. The crown cover per hectare was measured for each method by its shadow index. Comparing E%2×T in each method showed that CLAPA is the most suitable method to classify aerial photographs to determine shadow index and estimate crown cover.
Keywords
aerial photograph; Classification; crown cover; shadow index; Zagros
References

ـ توکلی، الف.، 1375. بررسی روند تغییرات کمی و کیفی جنگلهای زاگرس شمالی از طریق تکنیک تفسیر عکسهای هوایی. پایان نامه کارشناسی ارشد، دانشکده منابع طبیعی دانشگاه تهران، 71 صفحه.

- ثاقب طالبی، خ.، ساجدی، ت.، یزدیان، ف.، 1383. نگاهی به جنگلهای ایران. موسسه تحقیقات جنگلها و مراتع، شماره 339، 55 صفحه.

- جزیره ای، م. و ابراهیمی رستاقی، م.، 1382. جنگلشناسی زاگرس. انتشارات دانشگاه تهران، 560 صفحه.

- زبیری، م.، 1381. زیست سنجی (بیومتری) جنگل. انتشارات دانشگاه تهران، 411 صفحه.

- زبیری، م.، 1384. آماربرداری در جنگل. انتشارات دانشگاه تهران، 401 صفحه.

ـ زبیری، م. و دالکی، الف.، 1383. اصول تفسیر عکسهای هوایی. انتشارات دانشگاه تهران، 323 صفحه.

- زهره وندی، ع.، 1382. بررسی روند تغییرات و برآورد بنه با روش آماربرداری ترانسکت بر روی عکسهای هوایی و ترانسکت زمینی در جنگلهای قلاجه. پایان نامه کارشناسی ارشد، دانشکده منابع طبیعی دانشگاه تهران، 60 صفحه.

ـ سارویی، س.، 1378. بررسی امکان طبقه‌بندی جنگل به لحاظ تراکم در جنگلهای زاگرس به کمک داده‌های ماهواره‌ای. پایان نامه کارشناسی ارشد، دانشکده منابع طبیعی دانشگاه تهران، 122صفحه.

ـ نگهدارصابر، م.، 1372. اندازه‌گیری مشخصه‌های مناسب در آماربرداری جنگلهای حفاظتی جنوب زاگرس. پایان‌نامه کارشناسی ارشد، دانشکده منابع طبیعی دانشگاه تهران، 72صفحه.

- Anonymus, 1996. Using ArcView GIS. Environmental Systems Research Institute Inc. (ESRI), USA, 350 p.

- Anonymus, 2001. User's guide, Version 8.2 PCI Geomatics. Richmond Hill, Ontario, Canada, 122 p.

- Bai, Y., Walsworth, N., Roddan, B., Hill, D.A. and Thompson, D., 2005. Quantifying tree cover in the forest-grassland ecotone of British Columbia using crown delineation and pattern detection. Forest Ecology and Management, 212: 92-100.

- Barbezat, V., 2002. Aspects forestiers du zonage et de la dynamique du taux de boisement en pasturage boise jurassien. These EPFZ No 14892, 155 p.

- Barbezat, V. and Jacot, J., 1998. The CLAPA Project: Automated Classification of Forest with Aerial Photographs. Natural Resources Canada, CanadianForest Service, Pacific Forestry Centre, Victoria, British Columbia: 345 – 356.

- Carreiras, J. and Pereira, J., 2006. Estimation of tree canopy cover in evergreen oak woodlands using remote sensing. Forest Ecology and Management, 223 (1-3): 45 – 53.

- Fensham, R., Fairfax, J. and Holman, J., 2002. Quantitative assessment of vegetation structural attributes from aerial photography. International Journal of Remote Sensing,  23 (11): 2293 – 2317.

- Howard, J., 1991. Remote Sensing of Forest Resources, theory and application. Chapman&Hall, UK, 420 p.

- Paine, D. and Kiser, J., 2003. Aerial Photography and Image Interpretation. John Wiley & Sons, Inc., USA, 632 p.

- Rudnicki, M., Silins, U. and Lieffers, V., 2004. Crown cover is correlated with relative density, tree slenderness and tree height in Logepole Pine. Journal of Forest Science, 50(3): 356 – 363.

 

Statistics
Article View: 962
PDF Download: 614


counter
Journal management system. designed by sinaweb