ALOS PRISM (AW3D05 STANDARD) and Sentinel-1: Evaluation of New Sources of Digital Elevations Models

Giuliano Sant'Anna Marotta,Tati De Almeida,Suzan Waleska Pequeno Rodrigues,Vitória Rodrigues Ferreira Barbosa,Rejane Ennes Cicerelli

doi:10.26848/rbgf.v13.5.p2319-2331

Giuliano Sant'Anna Marotta, Tati De Almeida + Show 3 more

Open Access

https://doi.org/10.26848/rbgf.v13.5.p2319-2331

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Abstract

Digital Elevation Models (DEM) have many uses and many characteristics that influence choice of model to be used depending on the scale and research objectives. With the advancement of technology, new DEMs have emerged, as well as credible and widespread products such as Sentinel-1 and Advanced Land Observations Satellite World 3D (ALOS AW3D), each with distinct configurations. The height quality evaluation was performed based on Cartographic Accuracy Standard (PEC-PCD) analysis, tendency tests and examination of a profile in a region with rugged relief. A comparison was made with traditional DEM such as SRTM, ALOS PRISM, ALOS PALSAR and ASTER GDEM 2 with new DEMs AW3D Standard and MDS generate from Sentinel-1. The news DEMs have been classified as PEC B at regional scales (1:50,000). The AW3D Standard offers the best result, being rated PEC C for 1:25,000 scale. Another aspect should also be considered, the standard AW3D is capable of presenting more details on the terrain surface, while the DEM from Sentinel-1 SAR data presents a smoothed pattern. Sentinel-1 compared with products of the same spatial resolution, it is concluded that SRTM, ALOS PRISM, ALOS PALSAR products presented superior altimetric accuracy. While that the AW3D, despite the improvement in spatial resolution and altimetric accuracy remained in the same category as the PEC-PCD of the others.

Highlights

Computation of land surface height values is obtained by several modes, including topographic/ geodesic field surveys, aerophotogrammetric and images from terrestrial, airborne or orbital, optical or radar sensors and/or LiDAR
Sentinel-1 compared with products of the same spatial resolution, it is concluded that Shuttle Radar Topography Mission (SRTM), Advanced Land Observing Satellite (ALOS) panchromatic remote-sensing instrument for stereo mapping (PRISM), ALOS Phased Array type L-band Synthetic Aperture Radar (PALSAR) products presented superior altimetric accuracy
In many cases the problems are caused by the lack of familiarity of the peculiarities of the Digita l Eleva tion Models (DEM), which have different characteristics depending on the method of acquisition, processing, extension, spatial resolution or even by the type, digital surface model (DSM) or digital terrain model (DTM) (Egg et al, 2013)

Summary

Introduction

Computation of land surface height values is obtained by several modes, including topographic/ geodesic field surveys, aerophotogrammetric and images from terrestrial, airborne or orbital, optical or radar sensors and/or LiDAR (light detection and ranging). The resulting products are costly in acquisition and analysis because they involve highly specialized teams, specific software and high-performance hardware, making it untenable for many applications (Oliveira et al, 2017). Faced with this problem,a plentyof studies about the use of Geographic Information System (GIS) and Digital Terrain Models (DTM) or Digital Surface Models (DSMs) has been presented with the free and global alternatives. In many cases the problems are caused by the lack of familiarity of the peculiarities of the DEM, which have different characteristics depending on the method of acquisition, processing, extension, spatial resolution or even by the type, digital surface model (DSM) or digital terrain model (DTM) (Egg et al, 2013)

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