High-resolution DEM generation from spaceborne and terrestrial remote sensing data for improved volcano hazard assessment - A case study at Nevado del Ruiz, Colombia

被引：24

作者：

Deng, Fanghui ^{[1
]}

Rodgers, Mel ^{[1
]}

Xie, Surui ^{[1
]}

Dixon, Timothy H. ^{[1
]}

Charbonnier, Sylvain ^{[1
]}

Gallant, Elisabeth A. ^{[1
]}

Lopez Velez, Cristian Mauricio ^{[2
]}

Ordonez, Milton ^{[2
]}

Malservisi, Rocco ^{[1
]}

Voss, Nicholas K. ^{[1
]}

Richardson, Jacob A. ^{[3
,4
]}

机构：

[1] Univ S Florida, Sch Geosci, Tampa, FL 33620 USA

[2] Colombian Geol Serv, Dept Geol Hazards, Manizales, Colombia

[3] NASA, Goddard Space Flight Ctr, Planetary Geol Geophys & Geochem Lab, Greenbelt, MD 20771 USA

[4] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

来源：

REMOTE SENSING OF ENVIRONMENT | 2019年 / 233卷

基金：

英国自然环境研究理事会; 美国国家科学基金会;

关键词：

Nevado del Ruiz; Digital elevation model; TanDEM-X; InSAR; Terrestrial radar interferometry; Structure from motion; DEM fusion; Volcanic flow modeling; DIGITAL ELEVATION MODELS; 13; NOVEMBER; 1985; FROM-MOTION PHOTOGRAMMETRY; LAVA FLOW-VOLUME; TANDEM-X DATA; RADAR INTERFEROMETRY; JAKOBSHAVN ISBRAE; ASTER; ERUPTION; SRTM;

D O I：

10.1016/j.rse.2019.111348

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Volcanoes with rugged terrain remain a challenging target for generating high-resolution digital elevation models (DEMs), especially in tropical areas with frequent cloud cover. Using Nevado del Ruiz volcano as an example, we combined DEMs from the TanDEM-X (TDX) satellite mission, terrestrial radar interferometry (TRI), and Structure from Motion (SfM), to generate a new DEM with 10-m spatial resolution. This is the first study combining satellite radar, ground-based radar, photography, and freely available global DEMs to generate a high-resolution DEM without data gaps. TDX data from ascending and descending orbits were combined to generate the base DEM. Instead of using a raster format to fuse DEMs generated from different data sets with different resolutions, we developed a methodology based on 3-D point clouds: 1) re-georeference the 5-m TRI and similar to 1-m SfM DEMs to the 10-m TDX DEM using the iterative closest point (ICP) algorithm to minimize the horizontal and vertical discrepancy between DEMs; then 2) merge the multiple point clouds to generate a final DEM without data gaps using an adaptive algorithm that uses two search distances to smooth the transition at the edges of different data sets. We assess the new 10-m DEM by comparing simulated inundation zones obtained with two volcano flow models, LaharZ (for lahars) and VolcFlow (for pyroclastic flows), and find significant differences with respect to the 30-m SRTM DEM. Our LaharZ simulation over the new DEM shows a longer lahar run-out distance. For pyroclastic flows, the VolcFlow simulation over the new DEM produces highly channelized flows over the steep portions of a river channel and gives a larger extent of thicker deposits compared to those obtained with the 30-m SRTM DEM. Quantitative and qualitative geomorphic analysis suggests that up-to-date DEMs with high spatial resolution (similar to 10 m or even better) need to be generated to improve volcano hazard assessment for active volcanoes.

引用

页数：19