论文部分内容阅读
进行遥感定量分析时,需对各种地类面积和长度进行量算,以建立数量概念。面积量算方法主要有:格网或网点法、精密天平称量法、求积仪法、密度分割仪法、面积量测仪法等。长度量算方法有:分规截距法、里程计法、贴铜丝法、DIPIX系统手扶数字化法等。遥感定量分析是在定性分析的基础上进行的。现以杭州湾滩涂资源调查的滩涂面积及海岸线长度量算方法为例,介绍如下: 一、海岸线与低潮位线的确定为了获得准确的滩涂面积,这次滩涂资源调查采用了低潮位彩红外航空遥感。低潮位航空遥感,即把航空遥感的时间选在每月大潮退潮的时刻。这样可使滩涂充分裸露,获得滩涂的最佳影像。由于在不同岸段大潮退潮时刻不尽相同,所以根据每个岸段的大潮
For remote sensing quantitative analysis, the need for various types of land area and length of the calculation, to establish the concept of quantity. Area calculation methods are: grid or network method, precision balance weighing method, quadrature instrument, density segmentation instrument, the area measuring instrument method. Length measurement methods are: sub-standard intercept method, odometer method, paste copper wire method, DIPIX system handheld digital method. Remote sensing quantitative analysis is based on qualitative analysis. Now Hangzhou Bay tidal flat resources survey of beach area and the length of the coastline calculation method, for example, are as follows: First, the coastline and low tide bit line to determine In order to obtain accurate beach area, the beach resources survey using low tide bit color infrared remote sensing. Low-level airborne remote sensing, that is, the time of airborne remote sensing at the ebb tide of the month. This will allow the beach to be fully exposed and receive the best image of the beach. Due to the different ebb tides at different times, the tide of each shore section is different