Gain and offset or Lmin/Lmax Values on metadata images Rapideye

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luiz lai

• October 29, 2019 23:16

Hi Guys!

Where i can find the Gain and offset in metadata images from  Rapideye?

I need the Lmin and Lmax Values in Radience. in the PDF product specification, i found this :

To convert the Digital Number (DN) of a pixel to radiance it is necessary to multiply the DN value by the
radiometric scale factor. I found the radiometric scale factor, but the value is same for all bands. 

so the values ​​of lmin and lmax are the same for all rapideye bands? not sure if this is correct. 

Calculating: 

Lmin = Dn minimum possible * Radiometric scale factor = 0 

LMax =DNmaximum possible * Radiometric scale factor = 65535 * 0.00999999977 = 655.355 W/m2 sr µm

i'm need this values for atmospheric correction using COST MODEL. I'm using software Idrisi Selva.

Thank you so much!!

 

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  Lalitha Suggula

  • November 01, 2019 18:02

  Hi Luiz, the RapidEye Analytic OrthoTile pixel values have already been converted into radiance W/(m^2*μm*str) from DN values. The scaling factor is applied so that the resultant single DN values correspond to 1/100th of a W/(m2*sr*μm). The same scaling is applied to all bands.The conversion is done using the following formula:RAD(i) = DN(i) * radiometricScaleFactor(i), where radiometricScaleFactor(i) = 0.01The resulting value is the at-sensor radiance of that pixel in watts per steradian per square meter (W/m2*sr*μm). You should be able to take the Lmin and Lmax values without any additional calculations. All of this information is available on pages 30 and 31 of the Product Specifications Guide.

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  luiz lai

  • November 01, 2019 19:44

  Thank you Lalitha ! 

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