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36 results about "Net radiation" patented technology

Net Radiation. Earth's net radiation, sometimes called net flux, is the balance between incoming and outgoing energy at the top of the atmosphere. It is the total energy that is available to influence the climate. Energy comes in to the system when sunlight penetrates the top of the atmosphere.

ET estimation method for different crops of irrigated area based on canopy air temperature difference and remote sensing information

The invention relates to an ET estimation method for different crops of an irrigated area based on canopy air temperature difference and remote sensing information. The method comprises the steps thatcalibration and determination of characteristic parameters a and b are performed on an S-I model according to at least two years of typical detailed farmland test historical observation data so as toacquire a reliable and accurate calibrated S-I model; the Landsat7 and MODIS data are fused by using an enhanced space-time adaptive fusion algorithm by using the Landsat and MODIS remote sensing image data within the irrigated area crop growth period so as to obtain the LST data set of 30m spatial resolution per day within the irrigated area crop growth period; the LST is the surface temperature; and the distribution of the area farm net radiation Rn and the air temperature Ta is acquired through combination of the conventional observation data from the local weather bureau, and the area crop ET is estimated by using the calibrated S-I model on the basis of the LST data set of high spatial resolution. The area crop ET can be rapidly and accurately estimated so as to provide the timely and accurate data for agricultural irrigation management of the irrigated area.
Owner:CHINA INST OF WATER RESOURCES & HYDROPOWER RES

Construction method of regional scale double-source evapotranspiration model considering dynamic vegetation change

InactiveCN110059362ALess aerodynamic parametersCapable of multi-scale analysisDesign optimisation/simulationSpecial data processing applicationsAccuracy improvementComputational model
The invention provides a construction method of a regional scale double-source evapotranspiration model considering dynamic vegetation change. The construction method comprises the following steps: S1, performing regional evapotranspiration estimation of the double-source evapotranspiration model: calculating net radiation data of a required regional scale input by a model; calculating net radiation components Rns and Rnc; calculating each influence factor; performing simulated estimation on evapotranspiration ET; s2, carrying out parameter optimization under different vegetation types; s3, performing simulation effect verification of the regional scale double-source evapotranspiration model considering dynamic vegetation change: performing site scale verification; performing regional scale verification; and performing basin scale verification. According to the model disclosed by the invention, the dynamic change of the vegetation is incorporated into evapotranspiration calculation andanalysis, and meanwhile, the model is expanded to a regional scale, has a multi-scale analysis function and has the advantage of few aerodynamic parameters of the PT-JPL original model, has low requirements on ground data and aerodynamics, and plays a role in promoting the accuracy improvement of regional scale evapotranspiration estimation.
Owner:LANZHOU UNIVERSITY

Method and system for diagnosing plant water stress based on high-flux stomatal conductance

PendingCN113049750AWater stress is convenient and quickOvercome operational complexityTesting plants/treesStomaPlant Stomata
The invention discloses a method and system for diagnosing plant water stress based on high-flux stomatal conductance, and belongs to the technical field of agricultural irrigation. A plant water stress diagnosis system consisting of high-flux stem flow, meteorological data, net radiation measurement equipment and plant height leaf area parameter auxiliary measurement is combined with a P-M formula to continuously output high-flux stomatal conductance, so that a water stress index is calculated by utilizing the stomatal conductance; and the long-time, accurate, high-pass and continuous monitoring, quantification and diagnosis of plant water stress are realized; a reference plant growing under the condition of no water stress is placed in the same growth climate environment as a plant to be detected, and according to the characteristic that the stomatal conductance of the plant is very sensitive to the water stress, the invention provides an index for diagnosing the water stress of the plant. The index can be obtained by calculating the stem flow, net radiation and meteorological data of the to-be-measured plant and the reference plant which are automatically measured in a high-flux manner, so that the high-flux quantification and diagnosis of the water stress degree of the to-be-measured plant are realized. The method comprehensively considers plant physiological response and environmental influence, and has the characteristics of physiological basis, reliable data, long-time accuracy and high-pass continuity in the application of diagnosing plant water stress.
Owner:CHINA AGRI UNIV

Three-dimensional tapered nano-layer film structure, preparation method thereof and application thereof

PendingCN109943810AEnhanced infrared absorptionSolve the technical defect of low net radiative cooling powerMaterial nanotechnologyVacuum evaporation coatingCooling powerSilicon dioxide
The invention belongs to the field of novel energy technical development, in particular to a three-dimensional tapered nano-layer film structure, a preparation method thereof and application thereof.The three-dimensional tapered nano-layer film structure provided by the invention comprises silicon dioxide layer-hafnium dioxide composite layers and sliver layers, wherein silicon dioxide layers arearranged above hafnium dioxide layers; number of the silicon dioxide layer-hafnium dioxide composite layers is greater than 10; and the silicon dioxide layer-hafnium dioxide composite layers are arranged above the sliver layers. The invention further provides a preparation method for the three-dimensional tapered nano-layer film structure, and further provides application of the three-dimensionaltapered nano-layer film structure or a product prepared by the preparation method in a radiation cooling device. The three-dimensional tapered nano-layer film structure is introduced, so that high-performance dual-window atmospheric radiation can be realized, and high-efficiency passive radiation cooling ability can be finally realized. The technical defect that a daytime cooling method has low net radiation cooling power in the prior art is solved.
Owner:SHENZHEN UNIV

Method for inverting topsoil volumetric water content by employing multi-temporal observation data of geostationary meteorological satellite

The invention discloses a method for inverting topsoil volumetric water content by employing multi-temporal observation data of a geostationary meteorological satellite. The method mainly includes: a soil moisture inversion model is built; the land surface temperature and net surface shortwave radiation are inverted in a quantification manner by employing the data of the geostationary meteorological satellite, dimensionless treatment is performed on the land surface temperature and the net surface shortwave radiation, ellipse fitting is performed on the multi-temporal land surface temperature and the net surface shortwave radiation, an ellipse parameter corresponding to each pixel is obtained, and the parameters are regarded as input data of the soil moisture inversion model; an acquisition method of model coefficients is obtained; and specific requirements of dimensionless treatment are imposed on the land surface temperature and the net surface shortwave radiation. According to the method, the problems caused by the lack of polar orbiting satellite data information of the conventional optical and thermal infrared remote sensing soil moisture inversion method are solved.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1

Construction method of regional scale evapotranspiration model synchronously considering dynamic changes of vegetation canopies and root systems

PendingCN114510824AHigh simulationCompensating for shortcomings in estimating evapotranspirationData processing applicationsDesign optimisation/simulationSoil scienceCover-abundance
The invention provides a construction method of a regional scale evapotranspiration model synchronously considering dynamic changes of a vegetation canopy and a root system. The construction method comprises the following steps: S1, calculating net radiation, net radiation components and influence factors through regional scale data required by a PT-JPL model; s2, estimating the plant effective root depth Zr of the Chinese regional scale based on a Guswa model; and S3, coupling the effective root depth Zr of the plant into the PT-JPL three-source evapotranspiration model to construct a regional scale evapotranspiration model synchronously considering the dynamic change of the vegetation canopy and the root depth. According to the model, the vegetation dynamic change and the plant effective root depth are jointly incorporated into evapotranspiration calculation and analysis, the transverse change (vegetation coverage) of the vegetation dynamic state is considered, meanwhile, the longitudinal change (root depth) of the vegetation change is considered, the multi-scale analysis function is achieved, the requirements for ground data and aerodynamics are low, and the method is easy to implement. And the improvement of the evapotranspiration of the regional scale and the evapotranspiration component estimation accuracy is promoted.
Owner:LANZHOU UNIVERSITY

Automatic irrigation system

The invention provides an automatic irrigation system, which is provided with a temperature and humidity detection module for detecting the temperature and the humidity of a crop growth environment and judging whether moisture needs to be added to a crop, and a net radiation detection module for detecting net radiation of air in the crop growth environment, detecting the illumination intensity in the crop growth environment, wherein net radiation data and light intensity data are used for calculating of the crop and deducing the more accurate moisture required by the crop; and a micro-infiltration belt is buried into soil and water directly acts on a crop root, so that water loss is avoided and the utilization rate of water is improved. The automatic irrigation system is capable of detecting whether water stored in a box body is sufficient or not and adjusting supply of the moisture on the basis of a theoretical numerical value of the moisture required for crop growth according to the temperature, the humidity, the net radiation and the light intensity. Irrigation is carried out through the micro-infiltration belt, and the crop growth environment is considered to adjust supply of the moisture, so that the crop is provided with required sufficient moisture while the utilization rate of the water is improved.
Owner:GUILIN NORMAL COLLEGE

Surface net radiation estimation method and system, electronic equipment and storage medium

The embodiment of the invention provides an earth surface net radiation estimation method and system, electronic equipment and a storage medium, and the method comprises the steps: determining the multi-source data of a to-be-measured region based on the first remote sensing data and reanalysis meteorological data of the to-be-measured region or the second remote sensing data, the reanalysis meteorological data and the downlink short-wave radiation from station actual measurement data, wherein the first remote sensing data comprises downlink short-wave radiation, and the second remote sensingdata does not comprise downlink short-wave radiation; inputting the multi-source data into an earth surface net radiation estimation model to obtain an earth surface net radiation estimation result, output by the earth surface net radiation estimation model, of the to-be-measured area, wherein the surface net radiation estimation model is obtained by training based on sample site actual measurement data, a sample normalized vegetation index and sample reanalysis meteorological data of a sample region, actual measurement data of the sample station comprises sample downlink short-wave radiation,sample surface albedo and sample surface net radiation, and high-precision and high-resolution estimation of the surface net radiation is realized.
Owner:BEIJING NORMAL UNIVERSITY

Method of using shortwave radiation to estimate long-wave net radiation and downlink radiation and apparatus thereof

The invention provides a method of using shortwave radiation to estimate long-wave net radiation and downlink radiation and an apparatus thereof. The method of using shortwave radiation to estimate long-wave net radiation comprises the following steps of acquiring a short wave net radiation sample and a long wave net radiation sample; establishing a mathematical relationship between the short wave net radiation sample and the long wave net radiation sample; acquiring a remote sensing image to be processed; calculating the short wave net radiation corresponding to the remote sensing image; substituting the short wave net radiation into the mathematical relationship so that the long wave net radiation corresponding to the remote sensing image is acquired; and further, according to the long wave net radiation, acquiring long wave downlink radiation. Through the method and the apparatus, no matter in a cloud condition or under a clear sky condition, the short wave radiation can be used to estimate long wave radiation and a technical problem that the long wave radiation can not be acquired from the remote sensing image in the cloud condition so that a long wave radiation space is not continuous in the prior art is solved.
Owner:INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI

Crop irrigation method, device and system and readable storage medium

PendingCN112329212AAddressing Inadequate IrrigationThe solution is the problem of over-irrigationSelf-acting watering devicesDesign optimisation/simulationSoil scienceCrop coefficient
The invention discloses a crop irrigation method, device and system and a readable storage medium, and belongs to the technical field of agriculture, and the method comprises the steps: S1, collectingcrop environment information from a vegetation field of a crop, wherein the crop environment information comprises temperature data, humidity data, long-wave net radiation data and short-wave net radiation data; s2, processing the crop environment information by using a maximum entropy increase model to obtain a potential evapotranspiration amount and an actual evapotranspiration amount of the crop; S3, calculating a crop coefficient Kc corresponding to the crop by utilizing the potential evapotranspiration and the actual evapotranspiration, wherein the crop coefficient Kc is used for representing the condition that the crop is subjected to water stress; and S4, generating an irrigation strategy based on the crop coefficient Kc corresponding to the crop so as to irrigate the crop. Crops are irrigated in a targeted mode, the irrigation reliability is good, the irrigation accuracy is high, and the problem that the crops are not fully irrigated or excessively irrigated can be effectivelysolved.
Owner:HUAZHONG UNIV OF SCI & TECH

Downscaling sea surface net radiation determination method, system and device and storage medium

ActiveCN111273376ASolve technical problems that are difficult to adapt to finer spatial resolutionInstrumentsSensing dataImage resolution
The embodiment of the invention relates to the technical field of remote sensing technologies, and discloses a downscaling sea surface net radiation determination method, system and device and a storage medium. The method comprises the steps of firstly obtaining a preset downscaling estimation model; determining the net radiation of the first remote sensing data corresponding to the first spatialresolution through a preset downscaling estimation model to obtain the sea surface net radiation data corresponding to the second spatial resolution, wherein the value of the second spatial resolutionis smaller than the value of the first spatial resolution. According to the embodiment of the invention, because a downscaling processing mode corresponding to the preset downscaling estimation modelis used, the sea surface net radiation data with the smaller spatial resolution can be determined through the remote sensing data with the thicker spatial resolution, thereby solving the technical problem of being difficult to adapt to the smaller spatial resolution.
Owner:BEIJING NORMAL UNIVERSITY

Method for improving areal aridity/humidity simulating effect

The invention discloses a method for improving an areal aridity/humidity simulating effect. The method comprises the following steps: collecting monthly meteorological data of each site in a study area and net long wave radiation data in the study area, calculating total radiation simulation values by at least two total radiation correcting methods respectively, comparing all the total radiation simulation values with a total radiation observation value respectively, and judging out the total radiation correcting method with the highest accuracy; calculating net long wave radiation values by different net long wave radiation calculating methods, then judging out the net long wave radiation calculating method with the highest accuracy, and calculating a radiation correcting formula of net radiation; calculating the largest possible evapotranspiration according to the radiation correcting formula, and calculating an aridity/humidity index according to the largest possible evapotranspiration. Compared with the conventional FAO56 model calculation method, the method provided by the invention has the advantages as follows: through modification of the conventional model estimation method, the aridity/humidity simulating effect is improved, the applicable area of the model estimation method is widened and the model estimation method is higher in accuracy and better in reliability.
Owner:INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS

Method and device for estimating clear sky solar radiation in oasis farmland

The invention relates to a method and a device for estimating clear sky solar radiation in an oasis farmland. The method comprises the following steps: determining the earth's surface albedo and the earth's surface reflectance; utilizing a thermal infrared wave band to determine the earth's surface temperature, and affirming that the earth's surface temperature is equal to the air temperature based on the standard reference surface within the range of the oasis farmland; utilizing ground measured data to acquire downstream short-wave radiation and downstream long-wave radiation; utilizing the acquired data to determine the ratio of net radiation flux, average daily net radiation and instantaneous net radiation, the ratio of daytime net radiation to the instantaneous net radiation, and the ratio of the instantaneous net radiation at time t2 and the instantaneous net radiation at satellite passing time t1; according to the ratio of the net radiation flux, the average daily net radiation and the instantaneous net radiation, the ratio of the daytime net radiation to the instantaneous net radiation, and the ratio of the instantaneous net radiation at time t2 and the instantaneous net radiation at satellite passing time t1, determining the average daily net radiation, the daytime net radiation and the net radiance at any time point.
Owner:SHIHEZI UNIVERSITY

Radiation-resistant tent

The invention discloses a radiation-resistant tent. The tent comprises a tent body, wherein the tent body comprises a metal net layer consisting of metal wires, and a fabric layer; and the metal wires are obliquely crossed to form a net. The problem that the conventional tent cannot resist radiation is solved, the tent can effectively block multiple kinds of radiation, has a simple structure and is suitable to be widely used, living environment is good, and safety is improved.
Owner:NANTONG XIYUN TRADE
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