Analysis Of The Accuracy Evaluation Of TRMM Precipitation Data In Henan Province

Water is the most basic part of the natural geography system,at the same time,but also an important resource for biological survival.Water is one of the most common,but also the distribution of the wide range of substances.The 75% of the earth's surface is surrounded by water,which is the main feature of the earth is different from other planets,the earth is therefore called the "water planet".Water is the most basic material for life on earth.The most life on earth from boiling water.At the same time,the water cycle is the driving force of the earth's material and energy changes,the global circulation of materials,water heat distribution,energy flow plays an important role in promoting.Water is an important resource of all life including human life,is the most important part of living organisms.Water plays an important role in the evolution of life.Have the knowledge of water,the ancient oriental and Western simplicity of material in the water as one of the basic elements,water is one of the five ancient China,four ancient Western elements that also have water.Refers to the precipitation falling from clouds to the ground water or solid water,is an important part of global water circulation.Precipitation is the global surface water source,is also an important supply source of surface water.Heterogeneity and the time variation of precipitation in the spatial variation of the instability is caused by flood,waterlogging and drought.The main reason in the study of hydrology and water resources and the actual work,attaches great importance to the analysis and calculation of rainfall.Remote sensing products can change the temporal and spatial distribution of precipitation precipitation reaction,wide coverage,is of great significance for the eco hydrological studies of Henan Province,part of precipitation data missing.TRMM satellite precipitation in tropical areas has been widely used,but its application to the precipitation of warm temperate and subtropical areas of Henan Province in the intersection,still need to analyze the data for accuracy assessment in quality.The choice of Henan Province as the study area,and the precipitation data of 17 stations measured within the province as the basis,using the correlation coefficient method,scatter slope method,Kriging method,error analysis method,with the help of MRT,ArcGIS,ENVI and other tools for the TRMM 3B43 precipitation data ofprecipitation products accuracy evaluation analysis.In order to provide new means and decision-making basis for the eco hydrological research of Henan province.The conclusions of this study are as follows:(1)From the monthly precipitation TRMM 3B43 precipitation products,TRMM remote sensing precipitation data and actual measurement data show good correlation,but there are also some deviations,the relative error is obvious,the data accuracy is not high.The monthly precipitation in Henan province fluctuates more and more in spatial scale,and has no regularity.(2)From the seasonal precipitation TRMM 3B43 precipitation products,remote sensing data TRMM 3B43 precipitation precipitation products with good precision in study of seasonal scale,changes of precipitation in Henan province can reflect the season,application in seasonal scale to meet.The seasonal precipitation in the spatial scale,spring,summer and winter rainfall in the spatial distribution of a certain regularity,and the autumn precipitation spatial changes in the regularity is not strong in Henan Province.(3)From the TRMM 3B43 precipitation products annual precipitation situation,estimates TRMM 3B43 precipitation products annual precipitation data of high precision,can be used in the research on annual scale to meet.The annual precipitation in Henan province shows a certain regularity in the spatial scale,and the precipitation decreases from southeast to northwest.There are some deviations of precipitation data of TRMM 3B43 accuracy of precipitation precipitation products in monthly scale,showing the accuracy is not high.There is a good correlation between the seasonal and annual precipitation of precision,can reflect the variation of precipitation in Henan province Ji Henian scale,has certain applicability.TRMM precipitation data can be studied using in large scale in Henan province range,but each site needs calibration accuracy.