Clear Sky Calculator
免費
2.0.5for iPhone, iPad and more
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Clear Sky Calculator 螢幕截圖
About Clear Sky Calculator
The Clear Sky Calculator is used to determine the need for recalibration of radiation sensors. It is most accurate when used near solar noon in the summer months. The calculator estimates the intensity of solar radiation (either total global shortwave radiation, measured by pyranometers, or global photosynthetic photon flux density, measured by quantum sensors) incident on a horizontal surface at any time of the day, at any location in the world. The equations used to estimate clear sky solar radiation with the Clear Sky Calculator come from the clear sky solar radiation model used to calculate net radiation in the ASCE Standardized Reference Evapotranspiration Equation (http://www.kimberly.uidaho.edu/water/asceewri/index.html). The only input requirements to the calculator are site elevation, latitude, longitude, reference longitude, air temperature and relative humidity measurements or estimates. These data are typically easy to obtain, making the Clear Sky Calculator a simple solar radiation reference that can be used to estimate pyranometer and quantum sensor accuracy and determine the need for recalibration.
When used near solar noon over multiple clear, unpolluted days during spring and summer months, accuracy of the Clear Sky Calculator is estimated to be ± 4 % in all climates and locations around the world. As an example, modeled incoming shortwave radiation (SWi) from the Clear Sky Calculator closely tracked measured SWi (data from a heated and ventilated Kipp & Zonen CM21 pyranometer) for a clear day (April 21, 2012) in Logan, Utah. The ratio of measured SWi to modeled SWi was between 1.00 and 1.05 (0 % and 5 %) from 9 AM to 6 PM (solar zenith angles less than 65∞). The average ratio from two hours before solar noon to two hours after solar noon was 1.02 ± 0.01 (2 ± 1 %). (see http://www.apogeeinstruments.com/using-the-clear-sky-calculator/ )
A more detailed discussion of Clear Sky Calculator accuracy is given on the webpage (http://clearskycalculator.com/model_accuracy.htm), where the necessary accuracy of the required inputs is discussed.
Apogee strongly encourages our customers to use the Clear Sky Calculator as an effective way to monitor pyranometer and quantum sensor performance and determine the need for sensor recalibration. If a sensor is consistently different from the Clear Sky Calculator by more than a few percent, please contact us about recalibration.
When used near solar noon over multiple clear, unpolluted days during spring and summer months, accuracy of the Clear Sky Calculator is estimated to be ± 4 % in all climates and locations around the world. As an example, modeled incoming shortwave radiation (SWi) from the Clear Sky Calculator closely tracked measured SWi (data from a heated and ventilated Kipp & Zonen CM21 pyranometer) for a clear day (April 21, 2012) in Logan, Utah. The ratio of measured SWi to modeled SWi was between 1.00 and 1.05 (0 % and 5 %) from 9 AM to 6 PM (solar zenith angles less than 65∞). The average ratio from two hours before solar noon to two hours after solar noon was 1.02 ± 0.01 (2 ± 1 %). (see http://www.apogeeinstruments.com/using-the-clear-sky-calculator/ )
A more detailed discussion of Clear Sky Calculator accuracy is given on the webpage (http://clearskycalculator.com/model_accuracy.htm), where the necessary accuracy of the required inputs is discussed.
Apogee strongly encourages our customers to use the Clear Sky Calculator as an effective way to monitor pyranometer and quantum sensor performance and determine the need for sensor recalibration. If a sensor is consistently different from the Clear Sky Calculator by more than a few percent, please contact us about recalibration.
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最新版本2.0.5更新日誌
Last updated on 2021年09月28日
歷史版本
Added ePAR option
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Version History
2.0.5
2021年09月28日
Added ePAR option
2.0.4
2021年09月25日
Added ePAR Option
2.0.3
2019年03月23日
Fixed bug where the app failed to obtain weather information.
2.0.2
2018年09月18日
Updated launch screen images.
2.0.1
2018年08月25日
Fixed issue with Longitude and Timezone maps
2.0.0
2015年11月14日
• New interface. Fully automatic!
• Automatic “Clear Sky” solar output for current location, time, and weather.
• Quickly see the max solar output for the day, and when it happens.
• New, easy to use sensor verification process.
• Map view to quickly verify location.
• Edit values manually. Autofill by US zip code, or by using a map.
• Easily view intermediate calculated variables.
• Automatic “Clear Sky” solar output for current location, time, and weather.
• Quickly see the max solar output for the day, and when it happens.
• New, easy to use sensor verification process.
• Map view to quickly verify location.
• Edit values manually. Autofill by US zip code, or by using a map.
• Easily view intermediate calculated variables.
1.0.2
2015年06月05日
Fixed date and time bug in autofill mode.
1.0.1
2015年05月23日
Minor bug fixes.
1.0.0
2015年04月04日
Clear Sky Calculator FAQ
點擊此處瞭解如何在受限國家或地區下載Clear Sky Calculator。
以下為Clear Sky Calculator的最低配置要求。
iPhone
須使用 iOS 12.0 或以上版本。
iPad
須使用 iPadOS 12.0 或以上版本。
iPod touch
須使用 iOS 12.0 或以上版本。
Clear Sky Calculator支持英文