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[White Paper ]TOA Radiance Reflectance Conversion of KOMPSAT 1.5

Author
SI Imaging Services
Date
2018-07-02 04:33
Views
279
1. DN to TOA reflectance conversion of KOMPSAT Imagery
The top-of-atmosphere(TOA) reflectance is an important physical value to compare products from different sensors. In this document, the methodology to convert digital number (DN) of KOMPSAT imagery to TOA reflectance is explained and related parameters are given.

2. KOMPSAT-3 parameters

Following table shows Gain to be used for the calculation of TOA radiance from DN of KOMPSAT-3 imagery updated through filed campaign in 2014 and ESUN to be used for TOA reflectance calculation. The Offset for each band equals to zero due to dark current compensation.

Band Gain ESUN
MS 1 (Blue) 0.01811 2001.28
MS 2 (Green) 0.02541 1875.46
MS 3 (Red) 0.02023 1524.52
MS 4 (NIR) 0.01300 1027.38

Table 1. Gain and ESUN for KOMPSAT-3 (2014)


3. KOMPSAT-2 parameters

Following tables show Gain to be used for the calculation of TOA radiance from DN of KOMPSAT-2 imagery and ESUN to be used for TOA reflectance calculation.

Band TDI Index Gain ESUN
MS 1 (Green) 3 0.124692 1838
MS 2 (Blue) 4 0.117581 1915
MS 3 (NIR) 1 0.135002 1075
MS 4 (Red) 2 0.157563 1534

Table 2. Gain and ESUN for KOMPSAT-2 (TDI High)


For more details, please find attached PDF file.