Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1117/12.793829 |
Radiometric cross-calibration of the Terra MODIS and Landsat 7 ETM+ using an invariant desert site | |
Choi, Taeyoung (Jason)1; Angal, Amit1; Chander, Gyanesh2; Xiong, Xiaoxiong (Jack)3 | |
通讯作者 | Choi, Taeyoung (Jason) |
会议名称 | Conference on Earth Observing Systems XIII |
会议日期 | AUG 11-13, 2008 |
会议地点 | San Diego, CA |
英文摘要 | A methodology for long-term radiometric cross-calibration between the Terra Moderate Resolution Imaging Spectroradiometer (MODIS) and Landsat 7 (L7) Enhanced Thematic Mapper Plus (ETM+) sensors was developed. The approach involves calibration of near-simultaneous surface observations between 2000 and 2007. Fifty-seven cloud-free image pairs were carefully selected over the Libyan desert for this study. The Libyan desert site (+28.55 degrees, +23.39 degrees), located in northern Africa, is a high reflectance site with high spatial, spectral, and temporal uniformity. Because the test site covers about 12 kmx 13 km, accurate geometric preprocessing is required to match the footprint size between the two sensors to avoid uncertainties due to residual image misregistration. MODIS Level I B radiometrically corrected products were reprojected to the corresponding ETM+ image's Universal Transverse Mercator (UTM) grid projection. The 30 m pixels from the ETM+ images were aggregated to match the MODIS spatial resolution (250 m in Bands 1 and 2, or 500 m in Bands 3 to 7). The image data from both sensors were converted to absolute units of at-sensor radiance and top-of-atmosphere (TOA) reflectance for the spectrally matching band pairs. For each band pair, a set of fitted coefficients (slope and offset) is provided to quantify the relationships between the testing sensors. This work focuses on long-term stability and correlation of the Terra MODIS and L7 ETM+ sensors using absolute calibration results over the entire mission of the two sensors. Possible uncertainties are also discussed such as spectral differences in matching band pairs, solar zenith angle change during a collection, and differences in solar irradiance models. |
英文关键词 | Terra MODIS Landsat 7 ETM+ cross-calibration relative spectral response (RSR) reflectance desert Libya calibration |
来源出版物 | EARTH OBSERVING SYSTEMS XIII |
ISSN | 0277-786X |
出版年 | 2008 |
卷号 | 7081 |
ISBN | 978-0-8194-7301-1 |
出版者 | SPIE-INT SOC OPTICAL ENGINEERING |
类型 | Proceedings Paper |
语种 | 英语 |
国家 | USA |
收录类别 | CPCI-S |
WOS记录号 | WOS:000262056800029 |
WOS关键词 | AVHRR |
WOS类目 | Instruments & Instrumentation ; Remote Sensing ; Optics |
WOS研究方向 | Instruments & Instrumentation ; Remote Sensing ; Optics |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/297056 |
作者单位 | 1.Sci Syst & Applicat Inc, 10210 Greenbelt Rd,Suite 600, Lanham, MD 20706 USA; 2.SGT Inc, USGS, EROS, Sioux Falls, SD 57198 USA; 3.NASA, Sci & Explorat Directorate, GSFC, Greenbelt, MD 20771 USA |
推荐引用方式 GB/T 7714 | Choi, Taeyoung ,Angal, Amit,Chander, Gyanesh,et al. Radiometric cross-calibration of the Terra MODIS and Landsat 7 ETM+ using an invariant desert site[C]:SPIE-INT SOC OPTICAL ENGINEERING,2008. |
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