Study On Remote Sensing Information Extraction Of Regional Land Ecological Condition

Land ecological condition has long been a major concern among the ecological problems.The ecological conditions directly affect the regional ecological security of land,social economic development trend and the quality of people's life.The extraction of remote sensing information of regional land ecological conditions is the key link of land ecological condition survey and assessment,and the key link of land ecological condition,and it is an important means to find out the status of regional land ecological security.Based on the case study of remote sensing information extraction of regional land ecological conditions at home and abroad,this paper selects all kinds of influencing factors,and determines the index system.By analyzing the data source of land ecological remote sensing monitoring,the remote sensing satellite data source used for ecological environment monitoring and its load parameters(spatial resolution,temporal resolution,spectral resolution,radiation resolution),applicable spatial scale of remote sensing data sources,applicable ecological indicators for remote sensing data source are clarified,and the applicable data source of this research is clarified.By referring to the basic information and precision of various technical standards,combining with the selected indicators,the relationship between the indicators and remote sensing image spectral information,the construction principle of the index extraction model,the common methods and effects,the applicable conditions of different technical methods,and the requirements of the data source and its processing process,etc.Based on this,the paper completes the compilation of regional land ecological conditions remote sensing information extraction scheme,and takes the Beijing-Tianjin-Hebei urban agglomeration as an example,to verify the scheme,and complete the land ecological information extraction of the area.The main conclusions of this study are as follows:1.The technology scheme is scientific and feasible,which can lay the foundation for the promotion of remote sensing monitoring and information extraction technology of land ecological conditions.The scheme makes full use of the existing survey results,code specifications,literature materials,scientific and feasible information extraction methods,which can get the system,quantitative land ecological status results,conducive to mapping out the typical area,land ecological problems,also conducive to the promotion of this method,making it possible to monitor wide range of land ecology by remote sensing.2.In the process of remote sensing information extraction in the typical demonstration area,the following conclusions are obtained for information extraction operations:(1)Because the study area cross more than one administrative area,covered different landform types,surface cover is more complex,so it is necessary to conduct visual interpretation and quantitative remote sensing retrieval to regional ecological regionalization,to take reference to the surface morphology,climate characteristics and growing season difference of different ecological zones,to extract information from the survey and monitoring indicators of land ecological status;the whole region take use of MODIS images which with medium spatial resolution to quantitative analysis vegetation index,vegetation coverage,biomass and other indicators,and the indicators in built-up area are use the Landsat images which need a high spatial resolution.The two data sources are different in resolution and can be used to extract the land ecological status information.The research area involves numerous data,and the coordinate projection is not same,especially the MODIS data projection is different from other data,so we need to unify the coordinate and projection according to the requirements,improve the matching degree between different data,more convenient to use a variety of data for ecological analysis.(2)the results of remote sensing information extraction of the land ecological conditions of the study area can quantitatively describe the changes of the ecological environment in the region,and can also analyze the ecological status of different regions,provide basic information for the local land ecological problems,and lay the foundation for the economic and social development and ecological civilization construction.At the same time,the results of this research can provide support for the evaluation of land ecosystem services in typical demonstration area,and the necessary basic data for the investigation and evaluation of land ecological conditions and the construction of database.