Abstract
Oil palm tree is an important cash crop in Thailand. To maximize the productivity from planting, oil palm plantation managers need to know the number of oil palm trees in the plantation area. In order to obtain this information, an approach for palm tree detection using high resolution satellite images is proposed. This approach makes it possible to count the number of oil palm trees in a plantation. The process begins with the selection of the vegetation index having the highest discriminating power between oil palm trees and background. The index having highest discriminating power is then used as the primary feature for palm tree detection. We hypothesize that oil palm trees are located at the local peak within the oil palm area. To enhance the separability between oil palm tree crowns and background, the rank transformation is applied to the index image. The local peak on the enhanced index image is then detected by using the non-maximal suppression algorithm. Since both rank transformation and non-maximal suppression are window based, semi-variogram analysis is used to determine the appropriate window size. The performance of the proposed method was tested on high resolution satellite images. In general, our approach uses produced very accurate results, e.g., about 90 percent detection rate when compared with manual labeling.
Highlights
IntroductionThe Need for Oil Palm Tree Detection
The purpose of oil palm tree detection is to locate or count oil palm trees on map, aerial image or satellite imagery. This information is the key factor for oil palm plantation management and monitoring in each plantation area
Since there are various existing vegetation indices, we propose to use the vegetation index having the most power in discrimination between oil palm and non-oil palm objects
Summary
The Need for Oil Palm Tree Detection. Oil palm is a perennial monocot plant with a long generation period of about 25 years. It is an important economic crop in tropical areas of Southeast Asia, Africa and South America. Oil palm is the most efficient oil seed crop in the world when compared to other oilseed crops such as soybean, sunflower, rapeseed or canola, peanut, cottonseed, coconut, olive, etc. One hectare of oil palm plantation can produce up to ten times more oil than other leading oilseeds [1]. Palm oil is used in a wide variety of food products and is a raw material in the production non-food products. Global demand for palm oil has grown exponentially during the last 50 years. Palm oil accounted for more than 30% of all edible oil production in 2012/2013
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