Extracting oil palm crown from WorldView-2 satellite image

8th International Symposium of the Digital Earth

地球科学;计算机科学

Korom, A.^1 ; Phua, M.-H.^2 ; Hirata, Y.^3 ; Matsuura, T.^3

Faculty of Plantation and Agrotechnology, University Technology MARA (Sabah), Sabah, 88997 Kota Kinabalu, Malaysia^1

School of International Tropical Forestry, University Malaysia Sabah, Jalan UMS, Sabah, 88400 Kota Kinabalu, Malaysia^2

FFPRI, Matsunosoto 1, Tsukuba, Ibaraki, 305-8687, Japan^3

关键词: Biomass estimation;    Combined segmentations;    Commercial crops;    Grey scale images;    High resolution satellites;    Optimal threshold;    Satellite images;    Watershed segmentation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/18/1/012188/pdf
DOI  :  10.1088/1755-1315/18/1/012188

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Oil palm (OP) is the most commercial crop in Malaysia. Estimating the crowns is important for biomass estimation from high resolution satellite (HRS) image. This study examined extraction of individual OP crown from a WorldView-2 image using twofold algorithms, i.e., masking of Non-OP pixels and detection of individual OP crown based on the watershed segmentation of greyscale images. The study site was located in Beluran district, central Sabah, where matured OPs with the age ranging from 15 to 25 years old have been planted. We examined two compound vegetation indices of (NDVI+1)*DVI and NDII for masking non-OP crown areas. Using kappa statistics, an optimal threshold value was set with the highest accuracy at 90.6% for differentiating OP crown areas from Non-OP areas. After the watershed segmentation of OP crown areas with additional post-procedures, about 77% of individual OP crowns were successfully detected in comparison to the manual based delineation. Shape and location of each crown segment was then assessed based on a modified version of the goodness measures of Moller et al which was 0.3, indicating an acceptable CSGM (combined segmentation goodness measures) agreements between the automated and manually delineated crowns (perfect case is '1').