MOC-Based Parallel Preprocessing of ZY-3 Satellite Images

Abstract

The launch of the ZY-3 surveying and mapping satellite (ZSMS) by China has resulted in a significant increase in the volume of image data collected for subsequent processing. In this letter, we present our research on the message passing interface (MPI), open multiprocessing (OpenMP), and compute unified device architecture (CUDA)-based (MOC-based) preprocessing of ZSMS images in a system that consists of multiple central processing units (CPUs) and graphics processing units (GPUs). First, CPUs and GPUs in the system are organized into atomic computing resources (ACRs) by means of an MPI. Then, three cooperative methods are proposed for potential performance improvement of the processors with OpenMP and CUDA. The input/ output (I/O) overhead is also addressed in this letter. The experimental results show that the total execution time of the 12 ZSMS nadir images with four ACRs is reduced to 86.10 s, which could provide near-real-time response for the time-critical applications that follow. Index Terms-Central processing units (CPUs), graphics processing units (GPUs), input/output (I/O), MOC, parallel preprocessing, ZY-3 surveying and mapping satellite (ZSMS) images.

Petrocodon rubiginosus, a new species of Gesneriaceae from Guangxi, China

“…After thorough comparisons of diagnostic morphological and anatomical features of similar taxa from China, Vietnam and Thailand ( Wang et al 1990 , 1998 , Li and Wang 2005 , Phuong 2005 , Wei et al 2010 , Middleton et al 2015 ), it has been revealed that its morphological characters do not fit any known species, therefore, we conclude that it is a new species to science and accordingly describe it herein. Its morphological characters are compared with the closely related species, Petrocodon hechiensis .…”

“…At the same time, the specimen’s images and name list of the above-mentioned species were obtained and checked from Tropicos ( http://www.tropicos.org ), JSTOR Global Plants ( http://plants.jstor.org ), The Plant List ( http://www.plantlist.org/ ) and the International Plant Names Index ( http://www.ipni.org ). All morphological characters were studied under dissecting microscopes and are described using the terminology presented by Wang et al (1990 , 1998 ).…”

Chayamaritia vietnamensis (Gesneriaceae), a new species from Son La Province, northern Vietnam

“…These morphological characters of newly-proposed species were compared with those of the two known Chayamaritia species from protologues, type specimens and living plants. The description of the new species followed the terminology used by Harris and Harris (2001) and Wang et al (1998) . Assessment of the conservation status of the new species was according to Categories and Criteria of the IUCN (2019) .…”

Actinostephanus (Gesneriaceae), a new genus and species from Guangdong, South China

“…18) ( Wang et al 1990 , Wang et al 1998 ). Boeicopsis , Buxiphyllum , Schistolobos and Tumidinodus were treated as synonyms of Boeica Clarke, Paraboea (Clarke), Ridley, Opithandra Burtt, and Anna Pellegr, respectively ( Wang et al 1990 , Wang et al 1998 ; Li and Wang 2005 ). In addition, Opithandra was merged into Oreocharis Benth.…”