长江流域城市湖泊夜光影像(NPP-VIIRS-NTL)空间降尺度方法适用性研究
Spatial downscaling method applicability for NPP-VIIRS-NTL of urban lakes, Yangtze River Basin
- 2026年30卷第1期 页码:79-92
收稿:2025-02-11,
纸质出版:2026-01-07
DOI: 10.11834/jrs.20255083
移动端阅览
收稿:2025-02-11,
纸质出版:2026-01-07
移动端阅览
夜光遥感影像已广泛应用于城市环境、社会经济、生态保护、武装冲突灾后评估等领域。然而,由于长时序高空间分辨率夜光遥感数据的缺失,城市水体环境评估在夜光遥感研究中相对匮乏。本研究旨在弥补夜光遥感在内陆水体环境研究中的缺失,以长江流域面积>3 km
2
的形态各异的城市湖泊为研究对象,综合湖泊水体亮度温度LBT(Lake Brightness Temperature)、浮游藻类指数FAI(Floating Algae Index)和水色指数FUI(Forel-Ule Index)等水环境遥感评估参数,借鉴DisTrad、地理加权回归GWR(Geographically weighted Regression)和随机森林RF(Random Fores
t)等适用于热红外遥感数据的空间降尺度方法,引入面向对象的理论和相关性统计方法,探索适用于不同形态内陆水体区域Suomi极轨卫星Suomi-NPP(Suomi National Polar-orbiting Partnership)可见光红外成像辐射计VIIRS(Visible Infrared Imaging Radiometer Suite)夜光影像NTL(Nighttime Light)的最佳空间降尺度方法。结果表明:基于LBT和FAI,面向对象的DisTrad方法(OD-TA)具有一定的稳定性,而基于LBT和FUI,面向对象的地理加权回归方法(OGWR-TU)在滇池和巢湖等大面积(
>
10 km
2
),形状复杂度较高(PARA
>
65)的城市湖泊中表现出色;湖泊空间形态、湖滨夜间灯光的社会人文属性是影响空间降尺度方法适用性的主要因子。本研究结果不仅弥补了水体区域长时序高空间分辨率NTL影像的缺失,还可为城市湖泊光污染评估及滨湖环境社会人文环境分析等提供方法和数据支撑。
Remote sensing images of nighttime lights (NTL) have been widely used in diverse fields
including urban environment
socioeconomics
ecological protection
post-conflict assessment of armed conflicts. However
NTL pollution in urban water lakes is seldom studied due to the coarse spatial resolution of existing NTL images
such as those from the Defense Meteorological Satellite Program and the Suomi National Polar-Orbiting Partnership (Suomi-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS). Spatial downscaling techniques are needed to support NTL pollution studies for urban lakes. Urban lakes of provincial capitals in Yangtze River Basin are selected as our study area
which had been polluted by NTL because of rapid urbanization. This study aims to develop optimal spatial downscaling methods for NPP-VIIRS NTL images of urban lakes
using NPP-VIIRS NTL
LJ-1 01 NTL
and Landsat 8 OLI/TIRS images
to overcome the absence of remote sensing images of NTL in the study of inland water environment.
Lake brightness temperature (LBT)
floating algae index (FAI)
and Forel-Ule index (FUI) are selected as interpretive factors of urban lakes. These interpretive factors have four combinations: LBT(T)
LBT and FAI(TA)
LBT and FUI(TU)
LBT
FAI and FUI(TAU). Three downscaling models
namely
disaggregation procedure for radiometric surface temperature (DisTrad)
geographically weighted regression (GWR)
and random forest (RF)
are used with these combinations. A total of 11 object-oriented do
wnscaling methods are employed for every urban lake. These methods are evaluated using the coefficient of determination (
R
²) and root mean square error (RMSE) to identify the most effective approach for different types of urban lakes. Finally
this study employed the area and perimeter area ratio
average brightness of NTL (ANTL) and brightness threshold (RNTL)
and lakeside greenness to explore the impact factors on the applicability of NTL spatial downscaling methods.
The downscaling NPP NTL images are significantly correlated with LJ-1 01 NTL images for most of the urban lakes
except South Lake of Wuhan and Yao Lake of Nanchang. The RMSE between downscaling NPP images and LJ-1 01 images are less than 3 nW/(cm²∙sr) for urban lakes except for highly influenced urban lakes
such as East Lake
Huangjia Lake
South Lake
and Qingshan Lake. Among object-oriented DisTrad (OD)
object-oriented GWR (OGWR)
and object-oriented random forest (ORF) models
OD is robust
while ORF is unstable
the performance of OGWR is relatively moderate. The optimal combination of interpretive factors is different for the three spatial downscaling models. LBT and FUI (-TU) is the best combination for the OGWR model
while LBT and FAI (-TA) is the optimal combination for the OD model. No stable and ideal interpretive factor combination is available for the ORF model. The morphology of urban lakes and the intensity of human activities affect the applicability of NTL downscaling methods considerably. Meanwhile
the weather conditions of Landsat 8 OLI/TIRS acquisition dates may affect the performance of each model in different urban lakes.
OD-TA is the most robust
while OGWR-TU is most suitable for lakes with large areas (
>
10 km
2
) and high PARA (
>
65). OD-TA is mainly applicable to urban lakes with area
<
30 km
2
PARA
>
50
and greenness between 30—50. OGWR-TU is most suitable for Dianchi Lake and Chaohu Lake. The study underscores the importance of spatial morphology and built-up
area attributes in the downscaling method’s performance
providing a methodological foundation for urban lake NTL pollution assessment and environmental analysis.
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