The maneuverability of a satellite to perform nadir and off-nadir offers an excellent opportunity for gathering valuable information in the time of disaster events. This paper aims to compare how LAPAN-A3 spectral quality changed with different acquisition modes. Three scenes of LAPAN-A3 with different acquisition modes ranging from nadir to extreme off-nadir mode were analyzed. Using Sentinel-2A Multispectral Instrument data as the reference, geometric co-registration was performed, and the Root Mean Square Error was kept at maximum (<2.5 pixels). Pseudo-invariant features were selected semi-automatically using threshold values based on the Normalized Difference Vegetation Index and Normalized Difference Water Index. The digital number produced then compared to Sentinel-2A data. Pearson correlation coefficient, as well as linear regression, was calculated for four corresponding bands. Generally, the results show a decreased correlation value between the corresponding datasets as the roll-angle increased. The correlation value went down from 0.623 (Off-Nadir) to 0.497 (Extreme off-nadir) on Near-infrared band.


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    Title :

    Nadir vs. Off-nadir: Initial Look at LAPAN-A3 Off-nadir Acquisition Mode on its Spectral Quality


    Contributors:


    Publication date :

    2019-10-01


    Size :

    996959 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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