JP2013242279A - Shade coefficient calculation device, solar radiation forecast device, program and shade coefficient calculation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy in calculating solar radiation and determining whether or not an observation object can be viewed from a target point.SOLUTION: A shade coefficient calculation device includes: a humidity information acquisition unit for acquiring plural humidities corresponding to plural altitudes, respectively, at an observation point; a shade rate retention unit for retaining a shade rate indicating a rate of light blocked by atmosphere having one humidity at one altitude in association with each of plural combinations of plural altitude ranges and plural humidity ranges; and a shade coefficient calculation unit for using the shade rate retained by the shade rate retention unit to calculate a shade coefficient indicating a rate of light blocked by atmosphere at a target point. The shade rate retention unit retains one shade rate in association with a combination of one humidity range and one altitude range, and retains another shade rate lower than the one shade rate in association with a combination of the one humidity range and another altitude range higher than the one altitude range.

Description

The present invention relates to a shielding coefficient calculation device, a solar radiation amount prediction device, a program, and a shielding coefficient calculation method.

In Patent Literature 1, based on the cloud amount of the area of the installation location of the photovoltaic power generation facility and the cloud amount of the plurality of areas of the plurality of specific locations having a strong correlation with the amount of solar radiation of the area of the installation location, It describes the calculation of future solar radiation. In Patent Document 2, the water amount or the cloud amount of the clouds of each three-dimensional lattice through which a straight line connecting the prediction point and the observation target passes is added, and the observation target is viewed from the prediction point when the addition value is equal to or less than the determination threshold value. It is described that it can be determined.
Patent Document 1 JP 2012-53582 JP Patent Document 2 JP 2010-32383 A

  It is desired to improve the accuracy of calculating the amount of solar radiation or determining whether or not the observation target can be seen from the target point.

  A shielding coefficient calculation apparatus according to an aspect of the present invention includes a humidity information acquisition unit that acquires a plurality of humidity corresponding to each of a plurality of altitudes at a target point, and a plurality of combinations of a plurality of altitude ranges and a plurality of humidity ranges. Corresponding to each, using a shielding rate holding unit that holds a shielding rate indicating a ratio of light shielded by an atmosphere having one humidity existing at one altitude, and a shielding rate held by the shielding rate holding unit A shielding coefficient calculating unit that calculates a shielding coefficient indicating a ratio of light shielded by the atmosphere above the target point, and the shielding rate holding unit is associated with a combination of one humidity range and one altitude range. One shielding rate is maintained, and another shielding rate lower than one shielding rate is retained in association with a combination of one humidity range and another altitude range higher than one altitude range.

  In the shielding coefficient calculation apparatus, the humidity information acquisition unit may acquire a plurality of humidity corresponding to a plurality of altitudes of a plurality of predetermined atmospheric pressures. The humidity information acquisition unit may acquire a plurality of humidity levels corresponding to a plurality of altitudes of a plurality of atmospheric pressures having a wider interval between atmospheric pressure altitudes as the atmospheric pressure is lower. The humidity information acquisition unit may acquire a plurality of humidity predicted based on past weather data.

  In the shielding coefficient calculation device, the shielding coefficient calculation unit includes a plurality of pieces held in the shielding rate holding unit in association with altitude ranges and humidity ranges corresponding to altitudes and humidity ranges of a plurality of layers of the atmosphere on the target point. The shielding coefficient may be calculated using the shielding rate.

  The shielding coefficient calculating device calculates substantially half of the difference between the altitude one level higher than the altitude of one layer of the plurality of altitudes and the altitude one level lower than the altitude of the one layer among the plurality of altitudes. By further calculating a thickness of each of the plurality of layers by calculating the thickness of each of the plurality of layers, and the shielding coefficient calculation unit includes a plurality of shielding rates for each of the plurality of layer thicknesses. The shielding factor may be calculated by multiplying.

  The shielding coefficient calculation device further includes a cloud amount information acquisition unit that acquires a plurality of cloud amounts corresponding to a plurality of altitude ranges at the target point, and the shielding coefficient calculation unit further calculates the shielding coefficient using the plurality of cloud amounts. May be.

  A solar radiation amount predicting apparatus according to an aspect of the present invention provides the above-described shielding coefficient calculating apparatus, the shielding coefficient acquired from the shielding coefficient calculating apparatus, the total global solar radiation amount determined in advance for the target point, and the target point in advance. A solar radiation amount predicting unit that predicts the solar radiation amount based on the determined atmospheric transmittance.

  The shielding coefficient calculation method according to an aspect of the present invention includes a humidity information acquisition step of acquiring a plurality of humidity corresponding to each of a plurality of altitudes at a target point, a shielding rate holding unit having a plurality of altitude ranges and a plurality of humidity ranges. Shielded by the atmosphere above the target point using a shielding rate indicating the proportion of light shielded by the atmosphere with one humidity present at one altitude that is held in association with each of a plurality of combinations of A shielding coefficient calculating step for calculating a shielding coefficient indicating a ratio of light to be obtained, and a shielding rate holding unit holds one shielding rate in association with a combination of one humidity range and one altitude range, Corresponding to a combination of one humidity range and another altitude range higher than one altitude range, another shielding rate lower than one shielding rate is maintained.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

It is a figure which shows the functional block of a solar radiation amount prediction apparatus. It is a flowchart which shows the prediction procedure of the solar radiation amount by the solar radiation amount prediction apparatus. It is a figure which shows the actual numerical example in case a solar radiation amount prediction apparatus calculates a shielding coefficient.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 shows functional blocks of a solar radiation amount prediction apparatus 100 according to the present embodiment. The solar radiation amount prediction apparatus 100 includes a humidity information acquisition unit 10, a cloud amount information acquisition unit 12, a layer thickness calculation unit 14, a shielding coefficient calculation unit 16, a shielding rate holding unit 18, a solar radiation amount prediction unit 20, and a solar radiation amount parameter holding unit 22. Is provided. The solar radiation amount prediction apparatus 100 predicts the solar radiation amount at the target point based on weather forecast data provided from an information provider such as the Japan Meteorological Agency. The solar radiation amount prediction device 100 is an example of a shielding coefficient calculation device.

  The humidity information acquisition unit 10 acquires a plurality of humidity corresponding to each of a plurality of altitudes at the target point. The humidity information acquisition unit 10 may acquire a plurality of humidity levels corresponding to a plurality of altitudes of a plurality of predetermined atmospheric pressures. The humidity information acquisition unit 10 may acquire a plurality of humidity levels corresponding to a plurality of altitudes of a plurality of atmospheric pressures having a wider interval between the atmospheric pressure altitudes as the atmospheric pressure is lower. The humidity information acquisition unit 10 may acquire a plurality of humidity predicted based on past weather data.

  The humidity information acquisition unit 10 corresponds to a plurality of altitudes of a plurality of barometric pressures determined in advance from weather forecast data called so-called barometric surface data provided from an information provider such as the Japan Meteorological Agency, and a plurality of altitudes. You may acquire several humidity. The barometric surface data includes, for example, numerical data related to weather forecasts up to 33 hours ahead every 3 hours. The numerical data includes atmospheric pressure altitude information, relative humidity information, wind direction and wind speed information, temperature, and the like on the designated atmospheric pressure surface. The barometric altitude is also called a geopotential altitude and is an example of the altitude, and may be calculated from a static equilibrium equation. Relative humidity is an example of humidity, and indicates a value obtained by dividing the amount of water vapor contained in the atmosphere at a certain temperature by the amount of saturated water vapor at that temperature. For example, the Japan Meteorological Agency provides barometric surface data for each specified barometric surface. The humidity information acquisition unit 10 has the specified atmospheric pressure plane data of 1000 hPa, 975 hPa, 950 hPa, 925 hPa, 900 hPa, 850 hPa, 800 hPa, 700 hPa, 600 hPa, 500 hPa, 400 hPa, 300 hPa, 250 hPa, 200 hPa, 150 hPa, and 100 hPa. To get.

Table 1 shows the atmospheric pressure altitude and the relative humidity predicted every 3 hours at 850 hPa acquired by the humidity information acquisition unit 10. Note that the prediction target time is represented by, for example, universal time (UTC).

  The cloud amount information acquisition unit 12 acquires a plurality of cloud amounts corresponding to the lower layer, the middle layer, and the upper layer indicating a plurality of altitude ranges at the target point. The lower layer indicates an altitude range, for example, from the vicinity of the ground to an altitude of about 2000 m. The middle layer shows an altitude range from about 2000 m to about 5500 m, for example. The upper layer shows an altitude range of, for example, an altitude of about 5500 m or higher. The amount of clouds indicates the ratio of clouds in the sky. The cloud amount information acquisition unit 12 acquires the cloud amounts of the lower layer, the middle layer, and the upper layer from weather forecast data called so-called ground surface data provided from an information provider such as the Japan Meteorological Agency. The ground surface data includes, for example, numerical data related to weather forecasts up to 33 hours ahead every hour. The numerical data includes cloud information on the lower layer, middle layer, and upper layer, relative humidity information on the ground surface, precipitation information, and the like.

Table 2 shows a plurality of cloud amounts corresponding to the lower layer, the middle layer, and the upper layer acquired at a certain time by the cloud amount information acquisition unit 12.

  The shielding rate holding unit 18 corresponds to each of a plurality of combinations of a plurality of altitude ranges and a plurality of humidity ranges, and shows a shielding rate indicating a ratio of light shielded by the atmosphere having one humidity existing at one altitude. Hold. The shielding rate holding unit 18 holds one shielding rate in association with a combination of one humidity range and one altitude range, and combines one humidity range and another altitude range higher than the one altitude range. In correspondence with, another shielding rate lower than one shielding rate is maintained.

Table 3 shows an example of the shielding rate held by the shielding rate holding unit 18. In Table 3, the altitude range is divided into a lower layer, a middle layer, and an upper layer. The humidity range is divided into a relative humidity of 90% or more, a relative humidity of 80% or more and less than 90%, and a relative humidity of 70% or more and less than 80%. The shielding rate holding unit 18 holds the altitude coefficient and the humidity coefficient as the shielding rate in association with each of the combinations of the plurality of altitude ranges and the plurality of humidity ranges. The shielding rate holding unit 18 may hold a value obtained by multiplying the altitude coefficient and the humidity coefficient as the shielding rate.

  The shielding ratio is the ratio of the relative light shielded by the atmosphere of each altitude and humidity when the ratio of the light shielded by the atmosphere of 90% or higher humidity at the altitude included in the lower layer is evaluated as “1”. Indicates. In other words, the shielding ratio indicates the relative thickness of clouds of each altitude and humidity when the thickness of a cloud having a humidity of 90% or higher at the altitude included in the lower layer is evaluated as “1”.

  Here, the higher the altitude, the smaller the proportion of light that is shielded. For example, the ratio of light shielded by the atmosphere in the upper layer is smaller than the ratio of light shielded by the atmosphere in the lower layer. Therefore, the altitude coefficient that is a coefficient due to the altitude of the shielding rate has a smaller value as the altitude is higher.

  Also, the higher the humidity, the greater the percentage of light that is shielded. Therefore, the humidity coefficient, which is a coefficient due to humidity, of the shielding rate has a larger value as the humidity is higher.

  The layer thickness calculation unit 14 calculates approximately half of the difference between the altitude one level higher than the altitude of one layer among the plural altitudes and the altitude one level lower than the altitude of one layer (barometric surface) among the plural altitudes. By calculating as the thickness of one layer, the thickness of each of the plurality of layers is calculated. In the present embodiment, the thickness of the layer is regarded as the thickness of the cloud existing in the vicinity of the layer (atmospheric pressure surface), and the thickness of the layer is reflected in the shielding coefficient used as a parameter for predicting the amount of solar radiation. Note that approximately half includes a value that is just half of the higher altitude and the lower altitude, and a value obtained by rounding or rounding off a predetermined number of digits after the decimal point from the half value.

  The shielding coefficient calculation unit 16 calculates a shielding coefficient indicating the ratio of light shielded by the atmosphere above the target point, using the shielding rate and the cloud amount held by the shielding rate holding unit 18. It can be said that the shielding coefficient is a coefficient for evaluating the state of the cloud that shields light by the assumed cloud, assuming that the humid atmosphere above the target point is a cloud in the sky. The shielding coefficient calculation unit 16 is held in the shielding rate holding unit 18 in association with the altitude range and humidity range corresponding to the altitude and humidity of each of a plurality of layers (a plurality of atmospheric pressure surfaces) of the atmosphere above the target point. A shielding coefficient is calculated using a plurality of shielding rates. The shielding coefficient calculation unit 16 calculates the shielding coefficient by multiplying each of the thicknesses of the plurality of layers by each of the plurality of shielding ratios. The shielding coefficient calculation unit 16 multiplies each of the thicknesses of the plurality of layers by each of the plurality of shielding rates. The shielding coefficient calculation unit 16 adds the thicknesses of the plurality of layers after multiplication for each of the lower layer, the middle layer, and the upper layer. Further, the shielding coefficient calculation unit 16 multiplies the layer thickness added for each of the lower layer, the middle layer, and the upper layer by the cloud amount of each of the lower layer, the middle layer, and the upper layer. In addition, the shielding coefficient calculation unit 16 calculates the shielding coefficient by adding the thicknesses of the layers multiplied by the respective cloud amounts.

  As described above, the higher the altitude, the smaller the proportion of light that is shielded. Therefore, if the thickness of each layer in the upper layer calculated by the layer thickness calculation unit 14 is reflected in the shielding coefficient as it is, the ratio of light shielded by the atmosphere in each layer in the upper layer becomes larger than actual. Therefore, in order to adjust so that the thickness of each layer becomes thinner as the altitude is higher, the shielding coefficient calculation unit 16 multiplies the thickness of each layer calculated by the layer thickness calculation unit 14 by the altitude coefficient included in the shielding rate. To do.

  In addition, as described above, the layer thickness calculation unit 14 is an abbreviation for the difference between the height that is one step higher than the height of one layer of the plurality of heights and the height that is one step lower than the height of one layer of the plurality of heights. Half is calculated as the thickness of one layer. Here, the atmospheric pressure surface data acquired by the humidity information acquisition unit 10 is specified atmospheric pressure surface data having a wider interval between atmospheric pressure altitudes as the atmospheric pressure is lower. Therefore, the thickness of each layer in the upper layer calculated by the layer thickness calculation unit 14 is calculated to be thicker than the thickness of each layer in the lower layer. Therefore, in consideration of the characteristics of the atmospheric pressure surface data that can be acquired, the shielding coefficient calculation unit 16 determines the altitude coefficient included in the shielding ratio as the layer thickness in order to adjust the thickness so that the thickness of each layer is reduced as the altitude is higher. The thickness of each layer calculated by the calculation unit 14 is multiplied.

  Furthermore, as described above, the higher the humidity, the higher the possibility that the cloud exists in the sky, and the greater the proportion of light that is shielded. Therefore, if the thickness of the layer having a certain humidity calculated by the layer thickness calculation unit 14 and the thickness of the layer having a higher humidity than the certain humidity are reflected in the shielding coefficient at the same rate, the layer is shielded by the atmosphere of the layer having a low humidity. The ratio of light to be increased will be larger than actual. Therefore, the shielding coefficient calculation unit 16 multiplies the thickness of each layer calculated by the layer thickness calculation unit 14 by the humidity coefficient included in the shielding rate in order to adjust the thickness so that the thickness of each layer becomes thinner as the humidity decreases. To do. As described above, the shielding coefficient calculation unit 16 multiplies the thickness of each layer calculated by the layer thickness calculation unit 14 by the altitude coefficient and the humidity coefficient, thereby shielding the difference due to the difference in altitude and humidity. Reduce the error in the proportion of light being emitted.

  The solar radiation amount parameter holding unit 22 stores a solar radiation amount parameter used when the solar radiation amount prediction unit 20 predicts the solar radiation amount. The solar radiation amount parameter holding unit 22 holds the amount of solar radiation outside the atmosphere and the atmospheric transmittance. The amount of solar radiation outside the atmosphere is the amount of solar radiation reaching the upper end of the atmosphere, and is a theoretical value determined by longitude, latitude, and date / time. The transmittance indicates the rate at which sunlight attenuated by being scattered, reflected, or absorbed by atmospheric aerosol or the like reaches the ground surface.

  The solar radiation amount prediction unit 20 predicts the solar radiation amount based on the shielding coefficient, the total atmospheric solar radiation amount determined in advance for the target point, and the atmospheric transmittance predetermined for the target point. When the shielding coefficient is h, the solar radiation amount predicting unit 20 may calculate the solar radiation amount according to an expression of the total atmospheric solar radiation amount × atmospheric transmittance × f (h). Here, f (h) is represented by f (h) = − α × h + β. α and β are constants determined by experiments or the like based on the predicted solar radiation amount and the actual measurement value of the solar radiation amount. For example, α is 0.0001 and β is 0.7456. Α and β may be appropriately updated so that the predicted amount of solar radiation matches the actually measured amount of solar radiation.

  FIG. 2 is a flowchart showing a procedure in which the solar radiation amount predicting apparatus 100 predicts the solar radiation amount. FIG. 3 shows an actual numerical example when the solar radiation amount predicting apparatus 100 calculates the shielding coefficient. Hereinafter, the solar radiation amount prediction procedure will be described with reference to FIGS. 2 and 3.

  The humidity information acquisition unit 10 acquires the altitude and humidity of each atmospheric pressure determined in advance at a predetermined prediction target time at the target point. Moreover, the cloud amount information acquisition unit 12 acquires the cloud amounts of the lower layer, the middle layer, and the upper layer at a predetermined prediction target time at the target point. (S100). The humidity information acquisition unit 10 acquires a predetermined prediction target time, for example, a barometric altitude and a relative humidity at “12:00 on July 2, 2011 (20110702212)” 33 hours ahead from the atmospheric pressure surface data at each atmospheric pressure.

  The layer thickness calculation unit 14 calculates an altitude difference as the layer thickness of the altitude having a relative humidity of 70% or more (S102). For example, for the altitude “1450.4” of 850 hPa where the humidity is 93%, the layer thickness calculation unit 14 has an altitude “1967.3” of 800 hPa, which is one step higher than the altitude of 850 hPa, and 900 hPa, which is one step lower than the altitude of 850 hPa. Half of the difference from the altitude “958.3” of “504.5” is calculated as the altitude difference on the atmospheric pressure surface of 850 hPa, that is, the layer thickness.

  Next, the shielding coefficient calculation unit 16 refers to the altitude coefficient and the humidity coefficient held by the shielding rate holding unit 18 as the shielding rate, and multiplies each altitude difference by the altitude coefficient and the humidity coefficient corresponding to each altitude (S104). . For example, the shielding coefficient calculation unit 16 multiplies the altitude difference “1586.45” of the altitude “1586.45” at 500 hPa by the altitude coefficient “0.4” and the humidity coefficient “1” corresponding to the altitude. Then, the adjusted altitude difference “634.58” is calculated.

  The shielding coefficient calculation unit 16 adds the adjusted altitude difference for each of the lower layer, the middle layer, and the lower layer (S106). For example, the shielding coefficient calculation unit 16 adds the respective altitude differences “540.4” and “634.58” after adjusting the upper layer to calculate the total altitude difference “117.98” of the upper layer. The shielding coefficient calculation unit 16 multiplies the total altitude difference of each layer by the cloud amount of each layer (S108). For example, the shielding coefficient calculation unit 16 multiplies the total altitude difference “1174.98” of the upper layer by the cloud amount “85.5” of the upper layer to calculate the shielding coefficient “1004.61” of the upper layer.

  Further, the shielding coefficient calculation unit 16 calculates the shielding coefficient at the target point by summing up the shielding coefficients of the respective layers, which are values obtained by multiplying the cloud amounts of the respective layers (S110). Then, the solar radiation amount predicting unit 20 predicts the solar radiation amount at the target point based on the shielding coefficient at the target point, the solar radiation amount outside the atmosphere held by the solar radiation amount parameter holding unit 22, and the atmospheric transmittance (S112). .

  As described above, according to the present embodiment, the amount of solar radiation can be predicted by relatively simple calculation using the atmospheric pressure surface data and the ground surface data. Moreover, the amount of solar radiation can be predicted more accurately by using a shielding rate that includes an altitude coefficient and a humidity coefficient that takes into account the change in the proportion of light shielded by the atmosphere due to differences in altitude height and humidity. it can.

  In the present embodiment, the form in which the shielding coefficient is calculated based on the predicted humidity and altitude has been described. However, the shielding coefficient at the time of actual measurement may be calculated based on the actually measured humidity and altitude. Moreover, in this embodiment, the form which uses a shielding coefficient as a parameter for estimating the amount of solar radiation was demonstrated. However, the shielding coefficient may be used as an index for determining whether or not the observation target can be seen from the target point.

  In addition, the humidity information acquisition unit 10, the cloud amount information acquisition unit 12, the layer thickness calculation unit 14, the shielding coefficient calculation unit 16, the shielding rate holding unit 18, the solar radiation amount prediction unit 20, and the solar radiation amount parameter holding unit 22 according to the present embodiment. May be configured by installing a program for executing various processes for predicting the amount of solar radiation and causing the computer to execute the program. That is, by causing the computer to execute a program for performing various processes for predicting the amount of solar radiation, the humidity information acquisition unit 10, the cloud amount information acquisition unit 12, the layer thickness calculation unit 14, the shielding coefficient calculation unit 16, the shielding rate holding unit 18, The solar radiation amount prediction device may be configured by causing a computer to function as the solar radiation amount prediction unit 20 and the solar radiation amount parameter holding unit 22.

  The computer has various memories such as CPU, ROM, RAM, and EEPROM (registered trademark), a communication bus, and an interface. The CPU reads out a processing program stored in the ROM as firmware in advance and sequentially executes it to predict the amount of solar radiation. Functions as a device.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Humidity information acquisition part 12 Cloud cover information acquisition part 14 Layer thickness calculation part 16 Shielding coefficient calculation part 18 Shielding rate holding | maintenance part 20 Solar radiation amount prediction part 22 Solar radiation amount parameter holding part 100 Solar radiation amount prediction apparatus

Claims (11)

A humidity information acquisition unit for acquiring a plurality of humidity corresponding to each of a plurality of altitudes at the target point;
A shielding rate holding unit that holds a shielding rate indicating a ratio of light shielded by the atmosphere having one humidity existing at one altitude corresponding to each of a plurality of combinations of a plurality of altitude ranges and a plurality of humidity ranges. When,
A shielding coefficient calculation unit that calculates a shielding coefficient indicating a ratio of light shielded by the atmosphere on the target point using the shielding rate held by the shielding rate holding unit;
The shielding rate holding unit holds one shielding rate in association with a combination of one humidity range and one altitude range, and includes the one humidity range and another altitude range higher than the one altitude range. A shielding coefficient calculation device that maintains another shielding rate lower than the one shielding rate in association with the combination of the above.   The shielding coefficient calculation apparatus according to claim 1, wherein the humidity information acquisition unit acquires the plurality of humidity corresponding to the plurality of altitudes of a plurality of predetermined atmospheric pressures.   The shielding coefficient calculation device according to claim 2, wherein the humidity information acquisition unit acquires the plurality of humidity corresponding to each of the plurality of altitudes of the plurality of pressures having a wider interval between the pressure altitudes as the atmospheric pressure is lower.   The said humidity information acquisition part is a shielding coefficient calculation apparatus as described in any one of Claims 1-3 which acquires these several humidity estimated based on the past weather data.   The shielding coefficient calculating unit calculates a plurality of shielding rates held in the shielding rate holding unit in association with altitude ranges and humidity ranges corresponding to altitudes and humidity ranges of a plurality of layers of the atmosphere on the target point. The shielding coefficient calculation apparatus according to claim 1, wherein the shielding coefficient is calculated by using the shielding coefficient calculation apparatus. The thickness of the one layer is approximately half of the difference between the height one step higher than the height of one layer of the plurality of heights and the step height lower than the height of the one layer of the plurality of heights. Further comprising a layer thickness calculation unit for calculating the thickness of each of the plurality of layers,
The shielding coefficient calculation device according to claim 5, wherein the shielding coefficient calculation unit calculates the shielding coefficient by multiplying each of the plurality of layers by each of the plurality of shielding ratios. A cloud amount information acquisition unit that acquires a plurality of cloud amounts corresponding to the plurality of altitude ranges at the target point;
The shielding coefficient calculation apparatus according to claim 1, wherein the shielding coefficient calculation unit calculates the shielding coefficient by further using the plurality of cloud amounts.   A program for causing a computer to function as the shielding coefficient calculation device according to any one of claims 1 to 7. The shielding coefficient calculation device according to any one of claims 1 to 7,
Insolation for predicting solar radiation based on the shielding coefficient acquired from the shielding coefficient calculation device, the total amount of solar radiation outside the atmosphere determined in advance for the target point, and the atmospheric transmittance determined in advance for the target point A solar radiation amount prediction device comprising an amount prediction unit.   The program for functioning a computer as a solar radiation amount prediction apparatus of Claim 9. A humidity information acquisition step of acquiring a plurality of humidity corresponding to each of a plurality of altitudes at the target point;
The ratio of light shielded by the atmosphere having one humidity existing at one altitude, which the shielding ratio holding unit holds corresponding to each of a plurality of combinations of a plurality of altitude ranges and a plurality of humidity ranges. A shielding coefficient calculation step of calculating a shielding coefficient indicating a ratio of light shielded by the atmosphere on the target point using a shielding ratio,
The shielding rate holding unit holds one shielding rate in association with a combination of one humidity range and one altitude range, and includes the one humidity range and another altitude range higher than the one altitude range. A shielding coefficient calculation method for holding another shielding rate lower than the one shielding rate in association with the combination of the above.

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