IMAGE INTERPRETABILITY CHARACTERIZATION OF THEOS PANCHROMATIC IMAGING SYSTEM
- Research areas:
- Type of Publication:
- In Proceedings
- NIIRS, GIQE, image quality, THEOS
- Khetkeeree, Suphongsa; Liangrocapart, Sompong; Kiatlertseree, Panatda
- In this paper, we present the image interpretability characterization of Thailand Earth Observation System (THEOS) panchromatic imaging system with National Imagery Interpretability Rating Scale (NIIRS). The NIIRS is widely used for overall image quality assessment in the remote sensing field. We estimate the NIIRS by employing the General Image Quality Equation (GIQE) version 4. This GIQE is composed of many spatial characteristics such as Relative Edge Response (RER), Ground Sample Distance (GSD), Signal to Noise Ratio (SNR) and edge overshoot. A hyperbolic tangent function is proposed in this work to construct a step edge profile. This function shows an excellent correlation to step edge response and can be used to estimate the RER and edge overshoot. NIIRS of THEOS panchromatic system is derived from the level-1A data product from 2009 to 2015. The experimental results show a slight change of the RER, H and NIIRS. The SNR also decreases, but it is an insignificant effect for the NIIRS estimation. The average NIIRS of THEOS level-1A panchromatic imaging system is about 3.42. This proves that THEOS panchromatic system is still in an excellent condition after 8 years in operation.