中国农业气象 ›› 2015, Vol. 36 ›› Issue (04): 513-520.doi: 10.3969/j.issn.1000-6362.2015.04.016

• 论文 • 上一篇    下一篇

基于FY-3 VIRR的温度植被干旱指数在陕西省的应用及其IDL实现

王卫东,赵青兰,李化龙,周辉   

  1. 陕西省农业遥感信息中心, 西安 710015
  • 收稿日期:2014-11-18 出版日期:2015-08-20 发布日期:2015-10-19
  • 基金资助:
    陕西省气象局科技创新基金(编号2013M-19)

IDL Coding of Fy-3 VIRR-based Temperature Vegetation Drought Index and Application in Shaanxi Province

WANG Wei-Dong,ZHAO Qing-lan,LI Hua-long,ZHOU Hui   

  1. The Remote Sensing Information Center for Agricultural of Shaanxi Province, Xi 'an 710015, China
  • Received:2014-11-18 Online:2015-08-20 Published:2015-10-19

摘要: 以FY-3可见光红外扫描辐射计(VIRR)L1数据为信息源,对FY-3 VIRR L1数据在陕西省云检测、地表温度、温度植被干旱指数(TVDI)等反演方法进行本地化研究,同时使用IDL程序语言研制了FY-3 VIRR L1数据预处理、云检测、地表温度反演、TVDI指数法反演土壤干旱程度等应用程序,以实现利用温度植被干旱指数(TVDI)对陕西省土壤干旱程度的监测,并对检测结果进行数据反演。反演结果表明,利用FY-3 VIRR L1数据生成的TVDI与20cm土壤相对湿度具有良好的负相关性,相关系数在-0.535左右;TVDI能较好地反映陕西省土壤干旱状况,在延安、关中、陕南的TVDI反演结果与实际旱情一致性较好,但在植被覆盖较差的榆林部分地区,反演结果与实际旱情差异较大。

关键词: 地表温度, 归一化植被指数, 温度植被干旱指数, 土壤相对湿度, IDL语言, 陕西省

Abstract: The purpose of the present study is to monitor the soil drought of Shaanxi province based on the temperature vegetable drought index (TVDI). The visible and infrared rafiometer (VIRR) level-1 data from the FY-3 satellite was used as the source of data for the present study on cloud detection and inversion of land surface temperature and TVDI. The Interactive Data Language (IDL) was used to develop an application to preprocess FY3 VIRR level-1 data, implement cloud detection, and inverse the land surface temperature and TVDI-based soil drought. The data inversion proved that the TVDI obtained from FY-3 VIRR level-I data had a negative relation of about -0.535 with the relative humidity of the soil in 20cm underground.It can truly reflect the soil drought of Shaanxi Province. The TVDI data inversion truly reflected the soil drought for stations in Shaanxi province except Yulin where the vegetation coverage is low.

Key words: Land surface temperature, Normalized difference vegetation index(NDVI), Temperature vegetable drought index (TVDI), Relative soil humidity, IDL languages, Shaanxi province