CN109031473B - Automatic judgment method and device for completely sunny days - Google Patents
Automatic judgment method and device for completely sunny days Download PDFInfo
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Abstract
The invention provides an automatic judgment method and device for a completely sunny day, and relates to the technical field of remote sensing weather prediction, wherein the method comprises the steps of obtaining ground incident solar short wave radiation data of a target area on a preset time scale all day of a target date; calculating sunrise time, sunset time, short wave atmospheric transmittance and normalized incident solar radiation value according to the data; analyzing the change condition of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather condition of the target area according to the change condition; if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day; and if the normalized incident solar radiation value is not less than the threshold value of the sunny day, determining that the weather of the target area on the target date is completely sunny. The method and the device for automatically judging the completely sunny day can simply and quickly determine the completely sunny day or the completely cloudy weather condition.
Description
Technical Field
The invention relates to the technical field of remote sensing weather prediction, in particular to an automatic judgment method and device for a completely sunny day.
Background
Evapotranspiration is an important component of water circulation and earth surface energy balance, and plays an important role in research of subjects such as hydrology, meteorology, agriculture and geography. The remote sensing technology is considered as the only feasible method for obtaining the scale evapotranspiration distribution of the earth surface area from the aspects of technology, economy, effectiveness and the like. Research shows that the evapotranspiration distribution of local, regional and global scales can be estimated according to surface parameters and ground observation data obtained by remote sensing inversion.
In general, the remote sensing for obtaining the ground parameters required by evapotranspiration is mostly carried out under the condition that the satellite transit time is sunny. At present, when the condition that each characteristic factor of evapotranspiration is influenced by cloud is researched based on the day-to-day change characteristics of ground incident solar radiation and short-wave atmospheric transmittance data, an effective method for quickly determining the weather conditions of completely sunny days, completely cloudy days and the like is not available, so that a great deal of current researches on remote sensing inversion of surface evapotranspiration have the problem that the understanding of the day-to-day change process of the characteristic factor of evapotranspiration influenced by cloud is seriously insufficient, and the estimation accuracy of the remote sensing evapotranspiration is influenced.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for automatically determining a completely sunny day, which can simply and quickly determine a completely sunny day or a completely cloudy weather condition, and facilitate analysis of a daily variation process in which a characteristic factor of evapotranspiration is affected by clouds.
In a first aspect, an embodiment of the present invention provides an automatic determination method for a completely sunny day, including: acquiring ground incident solar short-wave radiation data of a target area on a preset time scale all day on a target date; calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of the ground incident solar short wave radiation data to the atmospheric layer top solar radiation value; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle; analyzing the change situation of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather situation of the target area according to the change situation; if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day; and if the normalized incident solar radiation value is not less than the clear day threshold value, determining that the weather of the target area on the target date is completely clear.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the method further includes: and if the normalized incident solar radiation value is smaller than the clear day threshold value, judging that the weather of the target area on the target date is completely cloudy.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the step of acquiring ground incident solar short-wave radiation data of the target area at a preset time scale on a target date for all days includes: and acquiring ground incident solar short-wave radiation data of the target area on the scale of half an hour on a whole day of the target date.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the analyzing changes of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance over time between the sunrise time and the sunset time, and determining the weather condition of the target area according to the changes includes: and if the slope of the ground incident solar short-wave radiation data changing along with the time and the slope of the short-wave atmospheric transmittance changing along with the time are positive values from the sunrise time to the noon time, and are negative values from the noon time to the sunset time, judging that the weather condition of the target area is clear.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the step of calculating the sunrise time and the sunset time of the target area on the target date according to the ground incident solar short-wave radiation data includes: traversing the ground incident solar short wave radiation data; the ground incident solar short wave radiation data is more than 5W/m for the first time in one day2The time corresponding to the data is set as sunrise time; the last occurrence of the ground incident solar short wave radiation data in one day is more than 5W/m2The time corresponding to the data of (1) is set as the sunset time.
In combination with the third possible implementation manner of the first aspect, an embodiment of the present invention provides the first aspectIn a fifth possible embodiment of the present invention, the above calculation formula for calculating the short-wave atmospheric transmittance at the preset time scale according to the ground incident solar short-wave radiation data is:
wherein τ is short wave atmospheric transmission, RsFor ground incident solar shortwave radiation data, RpThe value of the solar radiation at the top of the atmospheric layer.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the calculation formula of the atmospheric layer top solar radiation value is: rp＝S0cos θ, wherein RpIs the value of the top solar radiation of the atmosphere, S0Is the sun constant, theta is the sun zenith angle.
With reference to the sixth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the seventh aspect, where the calculation formula of the solar zenith angle is:
in the formula, theta is the zenith angle of the sun,
geographical latitude is solar declination, z is solar time angle, N is number of days, and t is local time.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the sunny threshold is calculated by a formula:
τsω＝0.75+2×10-5×H，
wherein T is a clear day threshold, RS↓The theoretical incident solar radiation value in sunny days, theta is the solar zenith angle, b is a designated constant, and tausωIs the theoretical one-way atmospheric transmittance in sunny days, H is the elevation, S0Is the sun constant, drIs the distance between day and ground, and N is the number of days.
In a second aspect, an embodiment of the present invention further provides an apparatus for automatically determining a completely sunny day, where the apparatus includes: the data acquisition module is used for acquiring ground incident solar short-wave radiation data of a target area on a preset time scale all day at a target date; the preprocessing module is used for calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of ground incident solar short wave radiation data to the top solar radiation value of the atmospheric layer; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle; the analysis and judgment module is used for analyzing the change condition of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with time between sunrise time and sunset time and judging the weather condition of the target area according to the change condition; a complete sunny day judging module, configured to compare the normalized incident solar radiation value with a sunny day threshold value if the weather condition is judged to be a sunny day; and if the normalized incident solar radiation value is not less than the clear day threshold value, determining that the weather of the target area on the target date is completely clear.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an automatic judgment method and device for a completely sunny day, wherein the method comprises the steps of obtaining ground incident solar short wave radiation data of a target area on a preset time scale of a target date on the whole day; calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; analyzing the change situation of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather situation of the target area according to the change situation; if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day; if the normalized incident solar radiation value is not smaller than the clear day threshold value, the weather of the target area on the target date is determined to be completely clear; the weather condition of completely sunny days or completely cloudy days can be simply and quickly determined, and the analysis of the daily change process of the evapotranspired characterization factor affected by the cloud is facilitated.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an automatic determination method for a completely sunny day according to an embodiment of the present invention;
fig. 2 is a flowchart of another automatic determination method for completely sunny days according to an embodiment of the present invention;
fig. 3 is a flowchart of another automatic determination method for completely sunny days according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an automatic determination apparatus for completely sunny days according to an embodiment of the present invention.
Icon:
41-a data acquisition module; 42-a pre-processing module; 43-analysis judgment module; 44-determination module in completely sunny days.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, when the condition that each characterization factor of evapotranspiration is affected by cloud is researched based on the day-to-day change characteristics of ground incident solar radiation and short-wave atmospheric transmittance data, an effective method for rapidly determining weather conditions such as completely sunny days and completely cloudy days is lacked. Based on this, the method and the device for automatically judging a completely sunny day provided by the embodiment of the invention can simply and quickly determine the weather condition of the completely sunny day or the completely cloudy day, and promote the analysis of the daily change process of the evapotranspiration characterization factor affected by the cloud.
In order to facilitate understanding of the embodiment, first, a detailed description is given to an automatic determination method for a completely sunny day disclosed in the embodiment of the present invention.
Example one
As shown in fig. 1, a flowchart of an automatic determination method for a completely sunny day according to an embodiment of the present invention is provided, and as shown in fig. 1, the method includes the following steps:
step S101: and acquiring ground incident solar short-wave radiation data of a target area on a preset time scale all day on a target date.
In at least one possible embodiment, the preset time scale may be half an hour. And acquiring ground incident solar short-wave radiation data of a target area on the scale of half an hour on a whole day of a target date, wherein the ground incident solar short-wave radiation data are data obtained by ground direct measurement. In other possible embodiments, the time scale may also be 1 hour, 1.5 hours, and so on.
Step S102: calculating sunrise time and sunset time of the target area on a target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of ground incident solar short wave radiation data to the top solar radiation value of the atmospheric layer; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle.
Here, in calculating the sunrise time and the sunset time of the target area on the target date, referring to fig. 2, it is an embodiment that the steps include:
s201: traversing the ground incident solar short wave radiation data;
s202: the ground incident solar short wave radiation data is more than 5W/m for the first time in one day2The time corresponding to the data is set as sunrise time;
s203: the last occurrence of the ground incident solar short wave radiation data in one day is more than 5W/m2The time corresponding to the data of (1) is set as the sunset time.
In this way, the sunrise and sunset times of the target date in the day are determined.
Next, the solar zenith angle of the target region needs to be calculated, and the calculation formula is as follows:
in the above formula, theta is the solar zenith angle,
geographical latitude, declination of the sun, and z, solar hour angle. Wherein, the calculation formulas of the solar declination and the solar hour angle are respectively as follows:
wherein N is the number of days and t is the number of places.
After the solar zenith angle of the target area is obtained, calculating the top solar radiation value of the atmospheric layer by using a calculation formula of the top solar radiation value of the atmospheric layer, wherein the calculation formula is as follows:
Rp＝S0cosθ (4)
in the formula, RpThe value of the solar radiation at the top of the atmospheric layer; s0Is the solar constant and takes the value of 1365W/m2(ii) a Theta is the solar zenith angle.
Then, calculating the short-wave atmospheric transmittance of a preset time scale according to the ground incident solar short-wave radiation data, wherein the calculation formula is as follows:
in the above formula, τ is short-wave atmospheric transmittance, RsFor ground incident solar shortwave radiation data, RpThe value of the solar radiation at the top of the atmospheric layer.
Step S103: and analyzing the change condition of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather condition of the target area according to the change condition.
Here, if the slope of the temporal change of the ground incident solar short-wave radiation data and the slope of the temporal change of the short-wave atmospheric transmittance are both positive values from the sunrise time to the midday time and are both negative values from the midday time to the sunset time, it is determined that the weather condition of the target area on the target date is a clear day.
Take the preset time scale as half an hour as an example. On the target day, if the ground is incident solar radiation R on half an hour scalesAnd corresponding short-wave atmospheric transmittance data tau from sunrise time trTo noon time tmMonotonically increasing while starting from noon time tmTo sunset time tsIf monotonously decreases, the day is preliminarily selected as a sunny day, namely the sunny condition meets the following formula 6 and formula 7:
wherein R issShort-wave solar radiation data is incident on the ground; t is tiThe moment corresponding to the ith half hour; t is ti+1The time corresponding to the (i + 1) th half hour; t is trIs the sunrise time; t is tmAt noon; t is tsIs the sunset time.
Step S104: and if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day.
Here, the clear-sky threshold is a reference threshold set according to the value of incident solar radiation on a theoretical clear-sky. In the embodiment of the invention, the calculation formula is as follows:
wherein T is a clear day threshold, RS↓The theoretical incident solar radiation value in sunny days, theta is the solar zenith angle, b is a designated constant, and tausωTheoretical one-way transmission of the atmosphere in a sunny day, drIs the distance between the day and the ground.
The calculation formulas of the theoretical atmosphere one-way transmittance and the theoretical sun-ground distance in sunny days are respectively as follows:
τsω＝0.75+2×10-5×H (9)
in the above formula, H is the elevation and N is the number of days.
Step S105: and if the normalized incident solar radiation value is not less than the threshold value of the sunny day, determining that the weather of the target area on the target date is completely sunny.
In another possible implementation, as shown in fig. 3, after the weather condition is determined to be sunny, if the normalized incident solar radiation value is smaller than a threshold value of sunny days, it is determined that the weather of the target area on the target date is completely cloudy.
Therefore, the weather conditions of the target area on the target date all day can be judged quickly according to the steps.
The automatic judgment method for the completely sunny day provided by the embodiment of the invention comprises the steps of acquiring ground incident solar short wave radiation data of a target area on a preset time scale of a target date on the whole day; calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; analyzing the change situation of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather situation of the target area according to the change situation; if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day; if the normalized incident solar radiation value is not smaller than the clear day threshold value, the weather of the target area on the target date is determined to be completely clear; the weather condition of completely sunny days or completely cloudy days can be simply and quickly determined, and the analysis of the daily change process of the evapotranspired characterization factor affected by the cloud is facilitated.
Example two
An embodiment of the present invention further provides an automatic determination device for a completely sunny day, referring to fig. 4, which is a schematic structural diagram of the automatic determination device for a completely sunny day provided in the embodiment of the present invention, as can be seen from fig. 4, the device includes a data acquisition module 41, a preprocessing module 42, an analysis determination module 43, and a completely sunny day determination module 44, which are sequentially connected. The functions of each module are as follows:
the data acquisition module 41 is used for acquiring ground incident solar short-wave radiation data of a target area on a preset time scale of a target date all day;
the preprocessing module 42 is configured to calculate a sunrise time and a sunset time of the target area on the target date, and a short-wave atmospheric transmittance and a normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of ground incident solar short wave radiation data to the top solar radiation value of the atmospheric layer; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle;
the analysis and judgment module 43 is used for analyzing the change situation of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with the time between the sunrise time and the sunset time, and judging the weather situation of the target area according to the change situation;
a complete sunny day determination module 44, configured to compare the normalized incident solar radiation value with a sunny day threshold value if the weather condition is determined to be a sunny day; and if the normalized incident solar radiation value is not less than the clear day threshold value, determining that the weather of the target area on the target date is completely clear.
The automatic determination device for a completely clear day provided by the embodiment of the invention has the same technical characteristics as the automatic determination method for a completely clear day provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the automatic determination apparatus in a completely sunny day described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An automatic judgment method for completely sunny days is characterized by comprising the following steps:
acquiring ground incident solar short-wave radiation data of a target area on a preset time scale all day on a target date;
calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of the ground incident solar short wave radiation data to the atmospheric layer top solar radiation value; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle; the calculation formula for calculating the short-wave atmospheric transmittance of the preset time scale according to the ground incident solar short-wave radiation data is as follows:
wherein τ is short wave atmospheric transmission, RsFor ground incident solar shortwave radiation data, RpThe value of the solar radiation at the top of the atmospheric layer;
analyzing the change condition of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with time between the sunrise time and the sunset time, and judging the weather condition of the target area according to the change condition;
if the weather condition is judged to be sunny, comparing the normalized incident solar radiation value with a threshold value of the sunny day;
and if the normalized incident solar radiation value is not smaller than the clear day threshold value, determining that the weather of the target area on the target date is completely clear.
2. The method of claim 1, further comprising:
and if the normalized incident solar radiation value is smaller than the clear day threshold value, judging that the weather of the target area on the target date is completely cloudy.
3. The method according to claim 1, wherein the step of obtaining ground incident solar short-wave radiation data of a target area on a preset time scale on a target date of a full day comprises:
and acquiring ground incident solar short-wave radiation data of the target area on the scale of half an hour on a whole day of the target date.
4. The method of claim 1, wherein the step of analyzing the time-dependent changes of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance between the sunrise time and the sunset time and determining the weather condition of the target area according to the changes comprises:
and if the slope of the ground incident solar short-wave radiation data changing along with time and the slope of the short-wave atmospheric transmittance changing along with time are positive values from the sunrise time to the noon time, and are negative values from the noon time to the sunset time, judging that the weather condition of the target area is sunny.
5. The method according to claim 4, wherein the step of calculating sunrise and sunset time of the target area on the target date according to the ground incident solar short wave radiation data comprises:
traversing the ground incident solar short wave radiation data;
the first occurrence of the ground incident solar short wave radiation data in one day is more than 5W/m2The time corresponding to the data is set as sunrise time;
the last occurrence of the ground incident solar short wave radiation data in one day is more than 5W/m2The time corresponding to the data of (1) is set as the sunset time.
6. The method according to claim 1, wherein the calculation formula of the top solar radiation value of the atmosphere layer is:
Rp＝S0cosθ
in the formula, RpIs the value of the top solar radiation of the atmosphere, S0Is the sun constant, theta is the sun zenith angle.
7. The method according to claim 6, wherein the calculation formula of the solar zenith angle is:
in the formula, theta is the zenith angle of the sun,
geographical latitude is solar declination, z is solar time angle, N is number of days, and t is local time.
8. The method according to claim 1, wherein the formula for calculating the clear day threshold is:
τsω＝0.75+2×10-5×H，
wherein T is a clear day threshold, RS↓The theoretical incident solar radiation value in sunny days, theta is the solar zenith angle, b is a designated constant, and tausωIn a theoretical sunny dayOne-way transmission of atmosphere, H is elevation, S0Is the sun constant, drIs the distance between day and ground, and N is the number of days.
9. An automatic judging device for a completely sunny day, comprising:
the data acquisition module is used for acquiring ground incident solar short-wave radiation data of a target area on a preset time scale all day at a target date;
the preprocessing module is used for calculating sunrise time and sunset time of the target area on the target date, and short-wave atmospheric transmittance and normalized incident solar radiation value of the preset time scale according to the ground incident solar short-wave radiation data; the short wave atmospheric transmittance is the ratio of the ground incident solar short wave radiation data to the atmospheric layer top solar radiation value; the normalized incident solar radiation value is the ratio of the ground incident solar short-wave radiation data to the cosine value of the solar zenith angle; the calculation formula for calculating the short-wave atmospheric transmittance of the preset time scale according to the ground incident solar short-wave radiation data is as follows:
wherein τ is short wave atmospheric transmission, RsFor ground incident solar shortwave radiation data, RpThe value of the solar radiation at the top of the atmospheric layer;
the analysis and judgment module is used for analyzing the change situation of the ground incident solar short-wave radiation data and the short-wave atmospheric transmittance along with time between the sunrise time and the sunset time and judging the weather situation of the target area according to the change situation;
a complete sunny day judging module, configured to compare the normalized incident solar radiation value with a sunny day threshold value if the weather condition is judged to be a sunny day; and if the normalized incident solar radiation value is not smaller than the clear day threshold value, determining that the weather of the target area on the target date is completely clear.
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| CN105911613A (en) * | 2016-07-01 | 2016-08-31 | 中国科学院地理科学与资源研究所 | Method for automatically confirming all-day cloudless and local cloudy weather situations |
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