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Crop Field Extraction Method using NDVI and Texture from Landsat TM Images
Shibasaki, Ryosuke,Suzaki, Junichi 대한원격탐사학회 1998 International Symposium on Remote Sensing Vol.14 No.1
Land cover and land use classification on a huge scale, e.g. national or continental scale, has become more and more important because environmental researches need land cover and land use data on such scales. We developed a crop field extraction method, which is one of the steps in our land cover classification system for a huge area. Firstly, a crop field model is defined to characterize $quot;crop field$quot; in terms of NDVI value and textual information. Textual information is represented by the density of straight lines which are extracted by wavelet transform. Secondly, candidates of NDVI threshold value are determined by $quot;scale-space filtering$quot; method. The most appropriate threshold value among the candidates is determined by evaluating the line density of the area extracted by the threshold value. Finally, the crop field is extracted by applying level slicing to Landsat TM image with the threshold value determined above. The experiment demonstrates that the extracted area by this method coincides very well with the one extracted by visual interpretation.
Miyatake Takahisa,Suge Taichi,Suzaki Shunsuke,Tanabe Shintaro,Ishihara Ryo,Matsumura Kentarou 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Swarming and mating behaviors of a mayfly species, Ephemera orientalis Mclachlan, 1875 were observed in 2015, 2016, and 2018 at a river bank of the Asahi River, Japan. Males started to make swarms between late April and middle May in 2016 and 2018. The numbers of mated pairs in a swarm correlated with the numbers of flying males in a swarm in 2016 and 2018. Swarms were formed during a limited period at dusk most probably because that interval is free from natural enemies. Males competed with each other to copulate with females in swarms. We clarified the function of the forelegs of males, which are significantly longer than those of females. Males used their forelegs to hold up a female from below. Besides forelegs, males have longer tails than females. We will discuss why sexual differences are found in these traits. Our results represent the first observation of swarm mating behavior in E. orientalis.