An Environmental Monitoring System for Lakes and Mashes by Using Aircraft Remote Sensing

利用植物色素叶绿素a的特定反射光谱的波长范围，对可能引起绿色藻或赤潮的浮游植物进行遥感，利用几种不同波长反射率的差异，确定叶绿素浓度，解决了在较短时间内发生的环境变化和较长时间内环境恶化的问题时间范围被认为是一个严重问题。因此，连续监测对于了解当前的环境变化和利用积累的数据来评价长期范围的变化是重要的。LANDSAT的数据已经积累了20年。虽然LANDSAT没有能力测量叶绿素的光谱特征，卫星提供了水体清洁度和颜色的可见光图像数据，（直升机）可以忽略大气的影响，可以获得补偿大气对卫星数据影响的基础数据。然而，航空遥感在测量过程中由于观测点的变化，需要对每一帧进行几何补偿，目前还没有有效的方法对数据进行快速、准确的自动补偿。一种滤波方法，以获得陆地上的实际点与从航空器检测到的陆地点之间的良好匹配。一种将多个不同的图像数据叠加的方法。

Wave length range of the specific reflection spectrum of plant pigment chlorophyll a is used for the remote sensing technology for plant plankton which may cause the green algae or red tide and the chlorophyll density could be determined with the difference of reflection ratio of several different wave lengths.The problem of environment change which happens in relatively short range in time as well as the aggravation of the environment in a long range of time frame is considered as a serious matter. Therefore, a consecutive monitoring is important for knowing current environment change and utilizing the accumulated data for the appreciation of the change in long term range is desired.The data from LANDSAT have been accumulated for the last 20 years Although LANDSAT does not have the capability to measure the spectrum characteristic from chlorophyll, the visible image data of water cleanliness and color from the satellite are available.The observation from aircraft (helicopter) is considered that it could acquire the fundamental data for compensating the atmosphere effect to the data from satellite because it could ignore the atmosphere effect. However, the remote sensing from aircraft needs geometrical compensation to each frame due to the change of the observatin point during the measurement.Effective method for automatic compensation to the data in fast and accurate manner is not still available, yet.We introduce a preliminary automatic data compensation process to the data from aircraft with introducing ;1. a filtering method to obtain a good matching between the actual points on land and the detected land points from airborne.2. a method to overlay the several different pictorial data.