Monitoring And Analysis Of Urban And Rural Local Ecological Environment Based On Thermal Infrared Remote Sensing Of Very High Resolution

Urban and rural ecological environment is currently facing an important test.The growing population,the urbanization process and the intensification of industrial activities have a huge impact on the ecological environment,as well as the human health.In view of the current urgent situation,appropriate environmental monitoring and management is very necessary.Compared with traditional environmental research methods such as field data collection,remote sensing has many advantages in the field of ecological environment research.Thus it is an ideal tool for urban and rural ecological environment research and of great significance for environmental improvement.On this basis,as one types of remote sensing,thermal infrared remote sensing has its unique advantages as it can bypass small obstacles,record radiation information and do not need light.Spatial resolution and atmospheric influence are two important factors affecting thermal infrared remote sensing.Accordingly,in this paper,the observation is carried out at a low altitude and close distance(4.3 m – 600 m)to reduce the impact of the atmosphere and obtain the thermal infrared remote sensing data with very high resolution.Based on very high resolution thermal infrared remote sensing,the following research methods were used in this paper: literature research method,experimental research method,comparative analysis method,statistical analysis method,interdisciplinary research method,visualization method,computer programming and other image processing methods to monitor and analyze the local ecological environment in urban and rural areas.The research objects are as follows: urban and suburban areas in Guangzhou,tropical forests in Costa Rica and a large-scale ecological wall of Cloud Forest of Gardens by the Bay in Singapore.The main work carried out in this paper is as follows:(1)An observation of the urban underlying surface at a near-ground height using thermal infrared camera was conducted.Synchronously,the underlying surface temperature was measured by contact method.Four kinds of underlying surfaces,such as grassland,cement floor,floor tile and permeable brick,were selected to compare the two kinds of temperature from the aspects of correlation,temperature difference and its percentage,the significance of the difference,so as to analyze and evaluate the temperature results of near-ground thermal infrared remote sensing.(2)A low-altitude observation of the urban and suburban areas in Guangzhou was carried out by an unmanned airship with a thermal infrared camera.Based on the thermal infrared remote sensing images acquired,the temperature distribution and thermal environment within the region and between the regions were analyzed from different perspectives using the typical profile analysis method and overall analysis method,respectively.Three remote sensing monitoring indicators applied in satellite remote sensing,such as urban surface heat island intensity,thermal field intensity index and relative surface radiation temperature were used to assess the regional thermal environment.(3)A tropical dry forest in Costa Rica was observed at a low altitude using UAV with a thermal infrared camera and a multispectral camera.Based on the classification results of multi-spectral data,the areas of different classifications were extracted from the thermal infrared images and the spatial distribution characteristics of them were analyzed.After that,the temperature difference between ?liana-infested areas? and ?non-liana infested areas? was studied.(4)A large-scale ecological wall of Cloud Forest in Gardens by the Bay,Singapore n was observed using thermal infrared,multispectral and hyperspectral cameras.Distribution characteristics and correlation between NDVI and temperature of plants on the ecological walls were analyzed.Water content information of the plants was studied by the ?triangle method?.Based on that,a reliable workflow for monitoring ecological walls using thermal infrared,multispectral and hyperspectral data was established.This study solved several problems in the study of urban and rural local ecological environment,filled some existing knowledge gaps,obtained a series of achievements,had several innovations,promoted and expanded the related research,and also provided some reference for the research in this field.