Search

[Objective] The extraction and change monitoring of cultivated land information is one of the hotspots of remote sensing application research. Northern Guangdong is the main grain base of Guangdong Province, and is the key area of cultivated land change monitoring by business management departments.[Method] In the present paper, using GF-2 and Sentinel-2 remote sensing images, combined with the phenological period of late rice in the study area, the vegetation index, humidity index, brightness index, color index and texture features were extracted for multi-scale segmentation, and the multi-scale image of paddy field extraction was constructed. The index difference image and time series multi feature difference image were classified to extract the paddy field area and evaluate the results.[Result]（i) The highest extraction accuracy of paddy field in time series multi feature difference image was 0.98,and the minimum difference between paddy field area and late rice sowing area was 240.05 hm2,and the best paddy field extraction effect was based on time series multi feature difference image;（ii）The difference of index feature needed to use the key phenological characteristics of crops and combine with multi-scale segmentation of image to improve the accuracy of paddy field extraction;（iii）The machine forest method has faster operation speed and higher classification accuracy in data classification with high dimensional features. [Conclusion] The research of the paper is to explore the method of high-resolution remote sensing in rapid and accurate updating of cultivated land information, which can provide support for the application of cultivated land management business. [ABSTRACT FROM AUTHOR]

Copyright of Guangdong Agricultural Sciences is the property of South China Agricultural University, Guangdong Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The region of the Luofu Mountains in Guangdong, China, has long been a Daoist sacred place for centuries. In the Daoist sacred geographic system "Dongtian Fudi" (Grotto-Heavens and Blissful Lands), the Luofu Mountains are ranked as the seventh "Major Grotto-Heaven", standing as an influential site for the practice Daoist immortals. Due to a sense of local pride and responsibility, the Guangdong literatus Han Huang (active approx. 1600–1639) compiled an important gazetteer named Luofu yesheng (The Unofficial Gazetteer of the Luofu Mountains) in 1639, which is largely underexplored. By investigating the texts and images within Luofu yesheng and by comparing them with other gazetteers of the Luofu Mountains compiled during the Ming dynasty, this article discovers that Han Huang compiled such a gazetteer and demonstrated the religious sacredness of the Luofu Mountains to advocate for recognition of their status as a grotto-heaven and by imaginatively reconstructing their lost religious sites in Luofu yesheng's texts and images. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)