Abstract
During the night pass, NOAA satellites transmit processed AVHRR CH.3 and CH.4 data in APT (Automatic Picture Transmission) format. A method to improve the spatial resolution of APT for practical use is proposed. More than 120 APT scenes received at around 11 Z in winter season from 1994 to 1995 were examined to select 55 meso-scale pictures of cloud-free sea areas around the Japan. Islands. Through the comparison of average temperature between APT-CH.A (AVHRR-CH.3) and CH.B (CH.4), the difference is found to be negligible only when the sea surface temperature is below 18-C. By reconstructing an interlaced imagery from these two images, spatial resolution improvements can be accomplished. Several examples show the improvement by one hundred and several tens of percentage in the extraction of current front edges in the cloud-free sea.
