Mechanism and algorithm for addressing the impact of multiple scattering on surface elevation extraction in photon-counting LiDAR data

Remote Sensing of Environment, Год журнала: 2025, Номер 318, С. 114603 - 114603

Опубликована: Янв. 15, 2025

Язык: Английский

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Synergistic mapping of urban tree canopy height using ICESat-2 data and GF-2 imagery

International Journal of Applied Earth Observation and Geoinformation, Год журнала: 2025, Номер 136, С. 104348 - 104348

Опубликована: Янв. 31, 2025

Язык: Английский

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Accuracy assessment of topography and forest canopy height in complex terrain conditions of Southern China using ICESat-2 and GEDI data

Frontiers in Plant Science, Год журнала: 2025, Номер 16

Опубликована: Март 20, 2025

ICESat-2 and GEDI offer unique capabilities for terrain canopy height retrievals; however, their performance measurement precision are significantly affected by conditions. Furthermore, differences in data scales complicate direct comparisons of capabilities. This study evaluates the accuracy retrievals from LiDAR complex environments. Jinghong City Pu’er Southwest China were selected as areas, with high-precision airborne serving a reference. Ground elevation retrieval accuracies compared before after scale unification to 30 m × under varying slope Results indicate that shows significant advantage retrieval, RMSE values 4.75 4.21 unification, respectively. In comparison, achieved 4.94 4.96 m. Both systems maintain high flat regions, but declines increasing slope. For outperforms ICESat-2. Before an R² 0.73 5.15 m, 0.67 5.32 contrast, showed lower performance, 0.65 7.42 0.53 8.29 unification. maintains higher across all levels. Post-scale both show ground being superior. achieves better accuracy. These findings highlight synergistic strengths ICESat-2’s photon-counting GEDI’s full-waveform techniques, demonstrating advancements satellite laser altimetry retrieval.

Язык: Английский

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Creation of ICESat-2 Footprint Level Global Geodetic Control Points Using Crossover Analysis

Remote Sensing, Год журнала: 2025, Номер 17(7), С. 1159 - 1159

Опубликована: Март 25, 2025

Precise measurements of the Earth’s surface are possible using satellite laser altimetry data, as demonstrated by NASA’s ICEsat-2 mission. Recently, vertical accuracy ICESat-2 data has been validated to <3 cm (bias) and <15 RMSE, making these a prime candidate for global reference system. This research will demonstrate methodology results creation network global, geodetic points based on crossover heights. In this study, we explore feasibility utilizing terrain heights at locations look evaluate from different beam combinations (i.e., strong–strong, weak–weak, weak–strong) well impact acquisition time, land cover, presence snow results. Comparisons high-quality crossovers against airborne lidar serving were found have mean error less than 15 each AOR examined RMSE 35 two three sites; value 85 was obtained third site. Preliminary indicate even in forested regions can be used vertically constrain other products such DEMs.

Язык: Английский

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A Robust InSAR-DEM Block Adjustment Method Based on Affine and Polynomial Models for Geometric Distortion

Remote Sensing, Год журнала: 2025, Номер 17(8), С. 1346 - 1346

Опубликована: Апрель 10, 2025

DEMs derived from Interferometric Synthetic Aperture Radar (InSAR) imagery are frequently influenced by multiple factors, resulting in systematic horizontal and elevation inaccuracies that affect their applicability large-scale scenarios. To mitigate this problem, study employs affine models polynomial function to refine the relative planar precision accuracy of DEM. acquire high-quality control data for adjustment model, introduces a DEM feature matching method maintains invariance geometric distortions, utilizing filtered ICESat-2 ATL08 as enhance accuracy. We first validate effectiveness features proposed InSAR-DEM algorithm select 45 ALOS high-resolution scenes with different terrain block experiments. Additionally, we additional Sentinel-1 Copernicus verify reliability multi-source adjustment. The experimental results indicate errors across areas were reduced approximately 50% 5%, while improved around 93% 17%. TPs extraction paper is more accurate at sub-pixel level compared traditional sliding window methods robust case non-uniform deformations.

Язык: Английский

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Influence of water quality on satellite laser altimeter underwater measurement accuracy

Frontiers in Environmental Science, Год журнала: 2025, Номер 13

Опубликована: Апрель 25, 2025

With the growing demand for global water environment monitoring, satellite laser altimeters (SLA) have considerable advantages underwater measurements. However, changes in suspended solids, turbidity, and other optical properties of affect propagation SLA pulses water. This can accuracy reliability study analyzed impact quality Oahu Island region Hawaii on un-derwater measurements based ICESat-2, MODIS, Landsat-8, situ data. Underwater photons were obtained from ICESat-2 ATL03 data through an Adaptive Elevation Difference Threshold, combined with to calculate potential altimetry deviation. Using inverted Landsat-8 as a reference, MODIS kd490 was implemented random forest regression. The quantified by combining bias that matched footprint. There is positive correlation between photon permeability. more turbid quality, smaller proportion penetrate surface. maximum measurement deviation caused multiple scattering body could reach meter level. Future bathymetry corrections need consider scattering. findings are importance environmental protection, resource management, policy formulation, processing.

Язык: Английский

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ICESat-2 Performance for Terrain and Canopy Height Retrieval in Complex Mountainous Environments

Remote Sensing, Год журнала: 2025, Номер 17(11), С. 1897 - 1897

Опубликована: Май 30, 2025

Accurate estimation of forest canopy height and understory terrain in mountainous regions is crucial for carbon stock assessment under the Paris Agreement but remains challenging. This study aimed to evaluate ICESat-2’s performance these complex environments. To achieve this, ICESat-2 ATL03 Version 6 photon data were processed using a novel adaptive DBSCAN algorithm (BDT-ADBSCAN) Pu’er City, China, biodiversity hotspot, results validated against airborne LiDAR. achieved high retrieval accuracy (R2 = 1.00, RMSE 0.91 m), primarily affected by slope, while was less accurate 0.53, 6.45 m) with systematic underestimation, mainly influenced itself. Nighttime strong-beam acquisitions substantially improved accuracies both products. research demonstrates viability high-resolution digital modeling provides quality control thresholds structure challenging regions, addressing validation gaps Asian hotspots supporting monitoring UN Sustainable Development Goals.

Язык: Английский

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NASA ICESat-2: Space-Borne LiDAR for Geological Education and Field Mapping of Aeolian Sand Dune Environments

Remote Sensing, Год журнала: 2023, Номер 15(11), С. 2882 - 2882

Опубликована: Июнь 1, 2023

Satellites are launched frequently to monitor the Earth’s dynamic surface processes. For example, Landsat legacy has thrived for past 50 years, spanning almost entire application spectrum of Earth Sciences. On other hand, fewer satellites with a single specific mission address pressing scientific questions, e.g., study polar icecaps and their response climate change using Ice Cloud Land Elevation Satellite (ICESat) program ICESat-1 (decommissioned in 2009) ICESat-2. ICESat-2 been operational since 2018 provided unprecedented success space-borne LiDAR technology. provides exceptional details topographies covering inland ice, snow, glaciers, land, waterbodies, vegetation three-dimensional (3D) space time, offering unique opportunity quantify Nevertheless, is not well known some disciplines, Geology Geomorphology. This study, first introduces use aeolian sand dune studies, purely from an remote sensing data perspective. Two objectives investigated. first, simplified approach understanding products along domains. Additionally, processing methods software applications briefly explained unify information article. Secondly, exemplified environments analyzed compared global Digital Models (DEMs), Shuttle Radar Topography Mission (SRTM). Our investigation shows that high-resolution topographic desert significant improvements existing methods, thereby facilitating geological education field mapping. Aeolian can be better understood, at present, traditional DEM-based methods.

Язык: Английский

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Correction of ICESat-2 terrain within urban areas using a water pump deployment criterion with the vertical contour of the terrain

Remote Sensing of Environment, Год журнала: 2023, Номер 298, С. 113817 - 113817

Опубликована: Сен. 20, 2023

Язык: Английский

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Can ICESat-2 estimate stand-level plant structural traits? Validation of an ICESat-2 simulator

Science of Remote Sensing, Год журнала: 2023, Номер 7, С. 100086 - 100086

Опубликована: Апрель 28, 2023

Global measurement of plant structural traits like canopy height, cover and Plant Area Volume Density (PAVD) profiles form a key input for many emerging fields in ecology meteorology. Here, we test the ability an ICESat-2 simulator, based on GEDI simulator presented by Hancock et al. (2019) pre-launch simulations Neuenschwander Magruder (2016), to replicate measurements retrieved from observations and, through this, explore sensitivity not currently ATL08 product. The takes Airborne Laser Scanning (ALS) data, produces pseudo-waveform then samples individual photons real measurements. Because assumes that photon-cloud distribution is proportional ALS vertical profile, which has been shown be sensitive structure, accurate would indicate traits. data are used re-classify ICESat-2, removing any classification error product order allow direct comparison returned photon profiles, simulation parameters - pure vegetation ground rates calculated. tracks intersect range sites forest types identified simulated, allowing one-to-one simulated observed photon-profiles trait cover, Relative Height metrics PAVD calculated similar, with having average height bias less than 50 cm 1.5% relative where canopy:ground reflectance ratio well constrained, indicating stand-level Noise differences between reflectances found two influences accuracy so measurement. This research suggests that, global mapping correctly classified product, it possible derive ICESat-2.

Язык: Английский

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