| Volcano is a dangerous source that threatens human life and brings great loss to production and life.The eruption of volcano produces high temperature magma,the traditional temperature measurement method has many difficulties,the study of remote sensing retrieval of volcanic temperature has important theoretical meanings and practical values.The spatial resolution of the short-wave infrared band is higher than that of the thermal infrared band,and according to the Wien displacement law,the short-wave infrared band is the sensitive band of the volcanic temperature retrieval,which has more significant advantages.The physical model of mixed pixel high temperature target short-wave infrared temperature retrieval is a common one.The night remote sensing image removes the solar radiation.The applicability of the short-wave infrared model,the establishment of the night remote sensing image temperature retrieval model and the quantitative retrieval of volcano night temperature are the scientific problems to be solved.This study adopts the method of theoretical derivation and analysis of the surface of the magma pure pixels,part of the radiation flux density,simplifies the high-temperature target mixed pixels short-wave infrared temperature retrieval physical model,established the short-wave infrared remote sensing of volcano day/night temperature retrieval physical model,constant calculation,parameter estimation and the parameter sensitivity analysis;Based on that,,short-wave infrared remote sensing temperature retrieval was carried out for kilauea volcano,erta'ale volcano and yasur volcano with the method of experimental calculation to verify the feasibility of the model,and thermal infrared remote sensing temperature retrieval was carried out for these research areas.This two retrieval results were compared.The main research results are as follows:1.The physical model of temperature retrieval of mixed pixel high temperature target and the energy composition of volcanic magma are analyzed,and the physical model of temperature retrieval of volcano remote sensing is obtained.The average solar irradiance of Landsat 8 satellite band was solved.The proportion of the magmatic emission energy and the reflected energy in the total radiation energy in the pixel is calculated.2.The composition of radiation energy in the night pixel is analyzed,the irradiance of the moon is analyzed,and the atmospheric path radiation is calculated.The increase in the radiation flux density of the pixel caused by it is of the order of10~-44 W/(m~2·?m)which can be ignored.The increase of the pixel radiation flux density caused by atmospheric path radiation is of the order of 10~-66 W/(m~2·?m),which can be ignored.On this basis,the model is simplified and the physical model of night short-wave infrared remote sensing volcano temperature retrieval is obtained for temperature retrieval.3.The physical model of day/night short-wave infrared remote sensing volcano temperature retrieval is restricted by atmospheric transmittance and magmatic emissivity.The three key parameters of atmospheric transmittance,magmatic emissivity and temperature were determined,and the sensitivity analysis of the parameters was carried out.The atmospheric transmittance in the daytime model had a great influence on the temperature retrieval results,while the magma emissivity and atmospheric transmittance in the night model had a great influence on the temperature retrieval results.4.Atmospheric vaper content was calculated by querying meteorological data or SWCVR algorithm,atmospheric transmittance was simulated by MODTRAN software through computer simulation,and the temperature retrieval of kilauea volcano,erta'ale volcano and yasur volcano was carried out by day/night short-wave infrared remote sensing with high precision5.The temperature retrieval of day/night thermal infrared remote sensing was carried out in the study areas of kilauea volcano,erta'ale volcano and yasur volcano with low precision. |
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