Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar
Airborne lidar can observe saltmarshes on a regional scale, targeting phenological and tidal states to provide the information to more effectively utilize frequent multispectral satellite observations to monitor change. Airborne lidar observations from NASA Goddard Lidar Hyperspectral and Thermal (G...
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doaj-44a6f212a8184290b42c83f7d3693ccd2020-11-25T00:46:03ZengMDPI AGRemote Sensing2072-42922019-03-0111550910.3390/rs11050509rs11050509Characterizing a New England Saltmarsh with NASA G-LiHT Airborne LidarIan Paynter0Crystal Schaaf1Jennifer L. Bowen2Linda Deegan3Francesco Peri4Bruce Cook5Universities Space Research Association, Columbia, MD 21046, USASchool for the Environment, University of Massachusetts Boston, Boston, MA 02125, USADepartment of Marine and Environmental Sciences, Northeastern University, Boston, MA 02115, USAWoods Hole Research Center, Falmouth, MA 02540, USASchool for the Environment, University of Massachusetts Boston, Boston, MA 02125, USAEarth Sciences, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAAirborne lidar can observe saltmarshes on a regional scale, targeting phenological and tidal states to provide the information to more effectively utilize frequent multispectral satellite observations to monitor change. Airborne lidar observations from NASA Goddard Lidar Hyperspectral and Thermal (G-LiHT) of a well-studied region of saltmarsh (Plum Island, Massachusetts, United States) were acquired in multiple years (2014, 2015 and 2016). These airborne lidar data provide characterizations of important saltmarsh components, as well as specifications for effective surveys. The invasive Phragmites australis was observed to increase in extent from 8374 m2 in 2014, to 8882 m2 in 2015 (+6.1%), and again to 13,819 m2 in 2016 (+55.6%). Validation with terrestrial lidar supported this increase, but suggested the total extent was still underestimated. Estimates of Spartina alterniflora extent from airborne lidar were within 7% of those from terrestrial lidar, but overestimation of height of Spartina alterniflora was found to occur at the edges of creeks (+83.9%). Capturing algae was found to require observations within ±15° of nadir, and capturing creek structure required observations within ±10° of nadir. In addition, 90.33% of creeks and ditches were successfully captured in the airborne lidar data (8206.3 m out of 9084.3 m found in aerial imagery).http://www.mdpi.com/2072-4292/11/5/509lidarsaltmarshclassificationmodelling |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ian Paynter Crystal Schaaf Jennifer L. Bowen Linda Deegan Francesco Peri Bruce Cook |
spellingShingle |
Ian Paynter Crystal Schaaf Jennifer L. Bowen Linda Deegan Francesco Peri Bruce Cook Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar Remote Sensing lidar saltmarsh classification modelling |
author_facet |
Ian Paynter Crystal Schaaf Jennifer L. Bowen Linda Deegan Francesco Peri Bruce Cook |
author_sort |
Ian Paynter |
title |
Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar |
title_short |
Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar |
title_full |
Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar |
title_fullStr |
Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar |
title_full_unstemmed |
Characterizing a New England Saltmarsh with NASA G-LiHT Airborne Lidar |
title_sort |
characterizing a new england saltmarsh with nasa g-liht airborne lidar |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2019-03-01 |
description |
Airborne lidar can observe saltmarshes on a regional scale, targeting phenological and tidal states to provide the information to more effectively utilize frequent multispectral satellite observations to monitor change. Airborne lidar observations from NASA Goddard Lidar Hyperspectral and Thermal (G-LiHT) of a well-studied region of saltmarsh (Plum Island, Massachusetts, United States) were acquired in multiple years (2014, 2015 and 2016). These airborne lidar data provide characterizations of important saltmarsh components, as well as specifications for effective surveys. The invasive Phragmites australis was observed to increase in extent from 8374 m2 in 2014, to 8882 m2 in 2015 (+6.1%), and again to 13,819 m2 in 2016 (+55.6%). Validation with terrestrial lidar supported this increase, but suggested the total extent was still underestimated. Estimates of Spartina alterniflora extent from airborne lidar were within 7% of those from terrestrial lidar, but overestimation of height of Spartina alterniflora was found to occur at the edges of creeks (+83.9%). Capturing algae was found to require observations within ±15° of nadir, and capturing creek structure required observations within ±10° of nadir. In addition, 90.33% of creeks and ditches were successfully captured in the airborne lidar data (8206.3 m out of 9084.3 m found in aerial imagery). |
topic |
lidar saltmarsh classification modelling |
url |
http://www.mdpi.com/2072-4292/11/5/509 |
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