基于多源多时相遥感影像的宁国前胡种植面积提取研究

Study of extracting Peucedanum praeruptorum planted area in Ningguo of Anhui province based on multi-source and multi-phase image

中药多种植在自然环境条件适宜而地形复杂的山区,种植地块分布零散,传统调查方法很难获得准确的种植面积。通过研究基于遥感的中药材种植面积提取方法,为中药资源保护和利用提供决策支持有着至关重要的意义。该文以安徽省宁国市前胡种植为例,分别以30 m分辨率的Landsat-8和16 m分辨率的国产"高分一号"(GF-1)多光谱遥感影像为数据源,首先利用前胡在不同时相的影像光谱特征变化来提取宁国市耕地中的前胡种植区域,其次利用与前胡套种的山核桃幼林的纹理和光谱特征来提取宁国市林地中的前胡种植区域。结果表明:利用30 m和16 m空间分辨率影像提取的前胡种植面积分别为25 635.43,24 585.43亩(1亩≈667 m2)。与统计数据相比,16 m分辨率影像提取的结果精度较高。

The herbs used as the material for traditional Chinese medicine are always planted in the mountainous area where the natural environment is suitable. As the mountain terrain is complex and the distribution of planting plots is scattered,the traditional survey method is difficult to obtain accurate planting area. It is of great significance to provide decision support for the conservation and utilization of traditional Chinese medicine resources by studying the method of extraction of Chinese herbal medicine planting area based on remote sensing and realizing the dynamic monitoring and reserve estimation of Chinese herbal medicines. In this paper,taking the Peucedanum praeruptorum planted area in Ningguo prefecture of Anhui province as an example,the multispectral remote sensing images that include Landsat-8 with a 30 m resolution and China-made GF-1 with a 16 m resolution were used as data source. Since the spectral characteristics of P. praeruptorum in the two periods are different from those of other crops,the changes of the images at two stages in the same year could be used to extract the P. praeruptorum planted area intercropped in cultivated land. Then the texture and spectral characteristics of young pecan trees were used to extract the P. praeruptorum planted area intercropped in woodland. The results showed that the extracted area of planted P. praeruptorum with the original imagery of 30 m spatial resolution and 16 m spatial resolution was 25635. 43,24 585. 43 mu,respectively.