Application Of High Resolution Spaceborne SAR In The Estimation Of Tobacco Production In Karst Mountain

From the present conditions for tobacco planting of mountainous are a in Guizhou, by means of SAR technology, combining with geographic i nformation system and global positioning systems and other modern infor mation technology, the modern tobacco cultivation of information collecti on, quantitative analysis and the establishment of fresh tobacco leaf produ ction model.By means of remote sensing can quickly collect information of agricultural resources and production, optical remote sensing is widely used in crops in the physical and chemical parameters inversion, but in gu izhou plateau mountain is located in the subtropical monsoon climate zon e, cloudy and rainy all the year round, optical remote sensing data acquisi tion is very difficult. In addition, Guizhou mountainous area for the karst landform,the large surface area of bare land,undulating terrain is rugged,f ragment,makes the distribution of the tobacco field,the tobacco field com plex and varied topography, tobacco to intensification of agricultural prod uction, in terms of its tobacco growth monitoring and tobacco yield estim ation also shows a great difficulties. SARdata adopts active remote sensin g method, using microwave imaging is not affected by the weather,using t he characteristice of SAR image in mountain area of karst was studied an d analyzed the multi polarization,multi band,multi temporal,are more suit able to be used in multiple cloud mountain.Apply can penetrate through c louds of high resolution radar SARdata plateau mountainous part of modern tobacco agriculture production survey, the implementation of modern t obacco agriculture production monitoring and the establishment of model s for predicting the yield of tobacco leaf fresh weight, and its key technol ogy were studied.Remote sensing technology can have the information of tobacco growth and make proper plans and adjustments from a macro standpoint, use high resolution Spaceborne SAR for explore data, collect the brightness value of spaceborne SAR’s remote-sensing image by denoising, DEM topographic correction, radiometric correction and some other early SAR data processings. Synchronizing the field data with monitoring time of time and analysing tobacco growth conditions and leaf blade output by combining the field data and SAR data can build different models for estimating the yield of tobacco. Comprehensive tobacco yield estimation model can build linear regression model inverting tobacco leaf area index by analysing the correlation of different HH、VV polarizations’ s radar brightness value and LAI,LAI is very important botany parameter and evaluation index,Tobacco products are leaves, so there is a close relationship between leaf area index and yield of tobacco.Next,evalute the suitability of tobacco growth. Suitability evaluation of tobacco is a process of identifying tobacco growth suitability aiming at situations of tobacco growth environment, the important basis of estimating the tobacco yield. Calculate the tobacco growth suitability and take it as one parameter of yield estimation model to complete it. With the method of combining empirical model and theoretical model, build comprehensive tobacco yield estimation model by synthesizing parameters like LAI suitability. Tobacco remote sensing image of tobacco’s different growth periods, reach tobacco’s SAR brightness value of different periods with processing radar remote sensing image, build a yield estimation model of linear regression coupling regressionship linking different polarization SAR brightness value of different periods with tobacco’s fresh weight output of corresponding periods with on-the-spot investigation data.The main contributions of this thesis mainly focuses on the followin g three aspects:(1) Analyse and collect different patterns’ SAR brightness value of tobacco leaves and LAI that reflects the growth of tobacco to take inversion, then build linear regression to inverse LAI of tobacco.(2) Build tobacco growth suitability evaluation of plateau mountain areas and reasonably evaluate scope of tobacco growth suitability within survey region by quantitative calculation of tobacco growth suitability.(3) It is feasible to use high resolution space borne SAR to do tobacco growth quantitative monitoring and yield estimation in plateau mountain areas. Through building tobacco yield estimation model of different ways by combining SAR technology, this can meets the need of large areas’ fast yield estimation in plateau mountain area and provide the research ideas of Guizhou tobacco yield estimation in Karst mountainous area.