Solar Radiation Measurement over Nepal Using FY-2C Satellite


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Solar Radiation Measurement Using FY-2C Satellite Data. :

Solar Radiation Measurement Using FY-2C Satellite Data. By Nagendra Bdr . Amatya DR. Binod K. Bhattarai

Importance of study:

Importance of study Accurate knowledge of solar radiation over the Nepal is highly important for many solar energy related applications. Very limited study has been conducted on this field. Limited ground based data are available to study irradiance over Nepal which are not sufficient to survey all over the country.


Cont … In consequence, it is widely accepted that solar radiation derived from satellite is an excellent tool for solar resource analysis . An accurate estimation of the downward solar irradiance is not only of particular importance for assessing the radiative forcing of the climate system, but also absolutely necessary for an efficient planning and operation of solar energy systems and the estimation of the energy load.


Cont ….. Solar resource assessment from geostationary satellites constitutes a powerful alternative to a meteorological ground network for both climatological and operational data (Perez et al., 1998a). The process for retrieving solar radiation data from satellite consist of processing data, modeling, calculation of model parameter, model validation and calculation of solar radiation

Flow chart of Map development solar radiation using satellite data:

Flow chart of Map development solar radiation using satellite data Processing of satellite data Model calculation of model parameter Model validation Calculation of solar radiation over the country Solar radiation data from measurement source: SERL, Dept. Physics , Silpakorn University, Thailand , 2010

Processing of satellite data::

Processing of satellite data: In This study, satellite data obtained from geostationary meteorological satellite FY-2C was used as main input of satellite-base model for calculation of solar radiation. Information of satellite The FY-2 series of geo-stationary meteorological satellites are operated by China Meteorological Administration (CMA). The first two satellites of FY-2, namely FY-2A and FY-2B, were experimental and launched on June 10, 1997 and June 25, 2000, respectively. The successive 3 satellites named as FY-2C/D/E are operational and will cover the period till 2012 around.( N smc.cma , et. al, 2004 )

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Illustration of the FY-2 spacecraft

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Channel ID Channel name Spectral range (µm) IR1 Long wave infrared 10.3  11.3 IR2 Split window 11.5  12.5 IR3 Water vapor 6.5  7.0 IR4 Medium wave infrared 3.5  4.0 VIS 1  4 Visible 0.55  0.90 FY-2C/D/E satellite scan radiometer channel definition Information sector S-VISSR 2.0 imagery data system IR1  IR3 upper 8- bit data VIS1  VIS4 6- bit data IR1  IR3 upper 2- bit data IR4 10 bit data IR1 IR2 IR3 VIS 1 VIS 2 VIS 3 VIS 4 IR1 IR2 IR3 IR4 Arrangement of FY2-2C/D/E S-VISSR2.0 data

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The Observing Scope of FY-2C/D/E Satellite at 105 o E Full disk image of FY2C at 0456 UTC 8 Jun 2006. source: FENG LU, “Image Navigation for the FY2 Geosynchronous Meteorological Satellite” . 2007

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Processing of satellite data (Navigation and conversion of satellite data): Step 1. Converting 8 bit satellite data into image format. For this process we use software IDL v 6.0. After converting into image format the image look line shown below in RGB color format. Step 2. Cropping the VIS 1 channel data Step 3 : sectorization of regional area including Nepal from VIS-1 image is next step of navigation for this we use 12.5N,74.0E, to 58.0N,102.2E

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IR VIS regional data including Nepal 58.0N, 102.E 12.5N, 74.0 E Converting satellite data into image and extracting vis1 cannel image and cropping regional area including Nepal

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Step 4. FY2C visible images with superimposed coastal lines and continental boundary. The digital data covered the regional image including Nepal with a spatial resolution of 3×3 km 2 .

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Step 5. These images were transformed into a cylindrical projection being linear in latitude and longitude. Cylindrical projected image of Regional including Nepal.

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Step 6 The satellite images are deviated from image to image and hence we have to navigate each image in same position manually one by one. For this process projected cylindrical map a re navigated referencing the cost line of bay of Bengal, I ndian ocean and lake Balqash . After finalizing the image we crop Nepal sector for further study.

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Model development and averaging map value Value of radiation calculate on the base of pixel color value which is 256 in gray scale Pixel of image in 256 g o rsy scale.

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For averaging we calculate pixel value of same location for picture to picture adding each pixel and divide by number of picture.

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Absorption and scattering radiation in the atmosphere and the earth surface.

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Effecting parameter for pixel value Satellite reflectivity coefficient Gases Ozone Aerosol Water vapor Satellite reflectivity coefficient from F2YC manual Other coefficient are calculated by other satellite data .

Model validity:

Model validity Estimated value of satellite is compared with ground data Kathmandu Pokhara Biratnager Lukla

Final Map will be produced in RGB color format with suitable interpolation :

Final Map will be produced in RGB color format with suitable interpolation

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Thank You

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