Validation of DEMs derived from radar interferometry, airborne laser scanning and photogrammetry by using GPS-RTK

Abstract

A high resolution digital elevation model (DEM) enables easy derivation of subsequent information for various applications. This paper uses Real-Time Kinematic (RTK) GPS to examine the quality of some DEMs generated by such means as radar interferometry (InSAR), airborne laser scanning (ALS) and photogrammetry. The preliminary results show that a DEM generated from ALS has the highest accuracy with a RMS error of 0.09 ~ 0.3m. The RMS errors of DEMs derived by photogrammetric and radar interferometric techniques are 1.03 ~ 3.75m and 4.26 ~ 27.81m respectively.

Sub-pixel precision image matching for measuring surface displacements on mass movements using normalized cross-correlation

“…The phase differences due to topography can be removed in different ways. (1) (Bamler and Hartl, 1998;Catani et al, 2005a;Catani et al, 2005b;Hsing-Chung et al, 2004;Kenyi and Kaufman, 2003;Luckman et al, 2003;Strozzi et al, 2004;Strozzi et al, 2002).…”

“…In most cases, they are complementary to each other; meaning, the weaknesses of one is covered by the others and vice versa. Summary of the strengths and limitations of each of the techniques is given in Table 3-1 (Baltsavias, 1999;Colesanti et al, 2003;Hsing-Chung et al, 2004;Lingua et al, 2008;Strozzi et al, 2004).…”

Coastal wetland response to sea‐level rise in a fluvial estuarine system

“…Lidar‐derived DEMs are a generally accepted means to generate accurate topographic surfaces over large areas [ Medeiros et al , ; Bilskie and Hagen , ]. While the ability to cover vast geographic regions at relatively low cost makes lidar an attractive proposition, there are well‐documented topographic errors, especially in coastal marshes, when compared to Real Time Kinematic (RTK) topographic survey data [ Hsing‐Chung et al , ; Hladik and Alber , ; Medeiros et al , ]. The accuracy of lidar DEMs in salt marsh systems is limited primarily because of the inability of the laser to penetrate through the dense vegetation to the true marsh surface [ Hladik and Alber , ].…”

The history of peak bagging

“…These are based on the measurement, using various instruments, of radiation emitted and/or reflected by the terrain, without the need for an on-site observer. For relief mapping, lidar, interferometric synthetic-aperture radar and aerial survey photogrammetry techniques have proved the most effective [88]. Because the instruments have to be airborne, remote sensing has only been able to develop thanks to advances in aviation and, above all, the launch of the first observation satellites Note 37 [89].…”