Relating soil surface moisture to reflectance

Liu, Weidong; Baret, Frédéric; Gu, Xingfa; Qing-Xi, Tong; Lanfen, Zheng; Zhang, Fangfang

doi:10.1016/s0034-4257(01)00347-9

Cited by 314 publications

(111 citation statements)

References 18 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…When the vegetation cover is decreased, the wet soil surface or the presence of surface water reduces the total reflectance (e.g. Weidong et al, 2002). Some of our field spectra show a low reflectance despite high vegetation vitality, which is possibly related to the very moist surface conditions on-site (e.g.…”

Section: Characterization Of Periglacial Surface Features By Field Spmentioning

confidence: 84%

“…Chabrillat et al, 2002;Okin et al, 2001;Pinker & Karnieli, 1995;Schmidt & Skidmore, 2003;van Til et al, 2004), often with focus on soil moisture (e.g. Weidong et al, 2002), leaf biochemistry (e.g. Elvidge, 1990;Jago et al, 1999), or vegetation water content (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A coarse-grained, wet soil has lower reflectance than a fine-grained, dry soil (Clark, 1999;van der Meer, 2004). Generally, the reflectance decreases when soil moisture increases (Weidong et al, 2002). Estimating soil moisture using distinct waterabsorption features is rather difficult if the soil is covered by vegetation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectral characterization of periglacial surfaces and geomorphological units in the Arctic Lena Delta using field spectrometry and remote sensing

Ulrich

Grosse

Chabrillat

et al. 2009

Remote Sensing of Environment

View full text Add to dashboard Cite

Important environmental parameters in arctic periglacial landscapes (i.e. permafrost temperature, activelayer depth, soil moisture, precipitation, vegetation cover) will very likely change in a warming climate. The thawing of permafrost, especially, might cause massive landscape changes due to thermokarst and an enhanced release of greenhouse gasses from the large amounts of carbon stored in frozen deposits, resulting in positive climate-warming feedback. For the identification, mapping, and quantification of such changes on various scales up to the entire circum-Arctic, remote sensing and spatial data analysis are essential tools. In this study an extensive field-work dataset including spectral surface properties, vegetation, soils, and geomorphology was acquired in the largest Arctic delta formed by a single river, the Siberian Lena River Delta. A portable field spectrometer (ASD FieldSpec Pro FR®) was used for spectral surveys of terrain surfaces, and optical satellite data (Landsat Enhanced Thematic Mapper (ETM+), CHRIS-Proba) were used for the characterization, manual mapping, and automatic classification of typical periglacial land-cover units in the Lena Delta. Qualitative data from soils, vegetation, soil moisture, and relief units were correlated with the field-spectral data and catalogued for a wide variety of surface types. The wide range of micro-and mesoscale variations of periglacial surface features in the delta results in distinctive spectral characteristics for different land-cover units. The three main delta terraces could also be spectrally separated and characterized. The present dataset provides a basis for further spectral data acquisitions in the Lena Delta and for comparisons with periglacial surfaces from other regions.

show abstract

Section: Characterization Of Periglacial Surface Features By Field Spmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectral characterization of periglacial surfaces and geomorphological units in the Arctic Lena Delta using field spectrometry and remote sensing

Ulrich

Grosse

Chabrillat

et al. 2009

Remote Sensing of Environment

View full text Add to dashboard Cite

show abstract

“…The averaged NIR reflectance for the tundra sites never exceeded 31%. It is well known that the presence of water reduces the overall reflectance, where the vegetation cover is more open [79]. Therefore, at Deadhorse (DH_z with 70 Vol% moisture) and the Franklin Bluffs wet site (FB_w with 74 Vol% moisture), despite the relative high averaged height of the vegetation structure, the high surface moisture absorbs in the NIR, and the NIR reflectance is thereby reduced.…”

Section: Overview Of Field Characterization and Spectral Properties Amentioning

confidence: 99%

Ground-Based Hyperspectral Characterization of Alaska Tundra Vegetation along Environmental Gradients

et al. 2013

View full text Add to dashboard Cite

Abstract:Remote sensing has become a valuable tool in monitoring arctic environments. The aim of this paper is ground-based hyperspectral characterization of Low Arctic Alaskan tundra communities along four environmental gradients (regional climate, soil pH, toposequence, and soil moisture) that all vary in ground cover, biomass, and dominating plant communities. Field spectroscopy in connection with vegetation analysis was carried out in summer 2012, along the North American Arctic Transect (NAAT). Spectral metrics were extracted, including the averaged reflectance and absorption-related metrics such as absorption depths and area of continuum removal. The spectral metrics were investigated with respect to "greenness", biomass, vegetation height, and soil moisture regimes. The results show that the surface reflectances of all sites are similar in shape with a reduced near-infrared (NIR) reflectance that is specific for low-growing biomes. The main spectro-radiometric findings are: (i) Southern sites along the climate gradient have taller shrubs and greater overall vegetation biomass, which leads to higher reflectance in the NIR. (ii) Vegetation height and surface wetness are two antagonists that balance each other out with respect to the NIR reflectance along the toposequence and soil moisture gradients. (iii) Moist acidic OPEN ACCESSRemote Sens. 2013, 5 3972 tundra (MAT) sites have "greener" species, more leaf biomass, and green-colored moss species that lead to higher pigment absorption compared to moist non-acidic tundra (MNT) sites. (iv) MAT and MNT plant community separation via narrowband Normalized Difference Vegetation Index (NDVI) shows the potential of hyperspectral remote sensing applications in the tundra.

show abstract

“…Moreover, they consider a soil layer depth of 1-mm, which is too thin to be appropriate for most land surface models. Liu et al [2002] indicate that different soil reflectances measured across the solar spectrum decrease with soil moisture up to a critical point and then increase before saturation.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of bare soil albedo to surface soil moisture on the moraine of the Zongo glacier (Bolivia)

Gascoin

Ducharne

Ribstein

et al. 2009

Geophysical Research Letters

View full text Add to dashboard Cite

International audienceThe dependence of bare soil albedo on soil water content is investigated using in situ data collected on the moraine of an Andean glacier (Bolivia). This study demonstrates a high negative correlation between the two variables that is best approximated by an exponential function, in agreement with previous studies. More importantly, the average snow-free albedo value during the rainy season is 40% lower than during the dry season (0.16 vs. 0.26). These results are relevant for climate and land surface modeling applications, where bare soil albedo is often considered as a constant parameter

show abstract

Relating soil surface moisture to reflectance

Cited by 314 publications

References 18 publications

Spectral characterization of periglacial surfaces and geomorphological units in the Arctic Lena Delta using field spectrometry and remote sensing

Spectral characterization of periglacial surfaces and geomorphological units in the Arctic Lena Delta using field spectrometry and remote sensing

Ground-Based Hyperspectral Characterization of Alaska Tundra Vegetation along Environmental Gradients

Sensitivity of bare soil albedo to surface soil moisture on the moraine of the Zongo glacier (Bolivia)

Contact Info

Product

Resources

About