Water Body Extraction Research Based on S Band SAR Satellite of HJ-1-C

Liu Liang,Huo Hongyuan,Li Xianbin,Jiang Xiaoguang,Zhang Xuehua,Zhang Wei

doi:10.23953/cloud.ijarsg.43

Abstract

The C Satellite of Environment and Disaster Monitoring and Forecasting Small Satellite Constellation (HJ-1-C) was launched successfully on 19 November 2012. It is the first Synthetic Aperture Radar (SAR) satellite for civil use in China and the only S-band SAR satellite on orbit in the world at present. One of its applications is to extract water body, which can be used for assessing the severity of floods or drought . As the user of the S Band SAR Satellite of HJ-1-C, the National Disaster Reduction Center of China (NDRCC) has the responsibility to assess its water body extraction capability and precision. This study validates the water extraction precision using the HJ-1-C by means of comparison with water body delineation using optical images of the HJ-1-B and ZY-3. The result shows that, the C Satellite has a prominent advantage in extracting details of water bodies as compared with the HJ-1-A and HJ-1-B.

Highlights

Environment and Disaster Monitoring and Forecasting Small Satellite Constellation (HJ-1) is the first small satellite constellation that is used on environment and disaster monitoring and forecasting, and the first civilian earth observation system with multiple satellites and multiple payloads in China
The “2+1” constellation consists of two small optical satellites (HJ-1-A, HJ-1-B) and one small radar satellite (HJ-1-C) [1]
The data used for precision validation of the extraction result is HJ-1-B CCD optical image with 30 m spatial resolution, which were obtained on 8 March 8 2013, when the most recent cloud-free HJ-1-C data for the study area were acquired

Summary

Introduction

Environment and Disaster Monitoring and Forecasting Small Satellite Constellation (HJ-1) is the first small satellite constellation that is used on environment and disaster monitoring and forecasting, and the first civilian earth observation system with multiple satellites and multiple payloads in China. The “2+1” constellation consists of two small optical satellites (HJ-1-A, HJ-1-B) and one small radar satellite (HJ-1-C) [1]. After more than seven years’ operation, HJ-1-A and HJ-1-B have become irreplaceable data resources in the Chinese comprehensive disaster prevention and reduction operation system. State-owned satellites that are specialized in Chinese disaster management work, stably operate onorbit. This marks the establishment of environmental and disaster reduction satellite “2+1” constellation, which continuously provides remotely, sensed data in these fields. Geometric precision correction,registration extract water body information based on region growing method and human interaction interpretation extract water body information based on region growing method and human interaction interpretation

Accuracy Analysis and Result Evaluation

Evaluation Standard

Test Results

Conclusions and Prospects