Comparison of DEM Accuracies Generated by Various Methods

Abstract

Presently, various different methods are I. INTRODUCTION being used for Digital Elevation Model (DEM) generation. DEMs can be generated from topographic maps obtained with terrestrial measurements, As known, Digital Elevation Models (DEM) have big Photogrammetric flight data or Remote Sensing importance for surveying and these are used in large variety of technologies. And also a question can be asked that applications and also lots of different engineering disciplines which method is better than others that's why these are used these models for different aims too. In this reason, the DEM generation techniques have been analysed and accuracy of a Digital Elevation Model becomes considerable. the accuracies of DEMs have been compared in this The important point is required accuracy, for some applications study. the accuracy should not be precise but for some it should be. For example, if 10m accuracy is enough for your study you For Zonguldak test field, three types of DEMs have can use a DEM generated by remote sensing but if you want been used. First DEM has been produced by digitized 10cm accuracy you should use a DEM obtained by contour lines of 1:25000 scale topographic maps, photogrammetric or geodesic methods. second one has been produced by photogrammetric flight project data had been made by Zonguldak Lots of different DEM generation techniques are being used Municipality in 2005 and last one has been derived presently and they have different accuracies and also used for from Shuttle Radar Topography Mission (SRTM) Xdifferent aims. In this study, principle DEM generation band data which has used single-pass Interferometric techniques have been determined and their accuracies have Synthetic Aperture Radar (InSAR) technique for been analysed. Firstly DEMs have been determined briefly DEM generation. then generation techniques have been realized and the comparison of accuracies have been done. In the study, all these DEMs have been compared one by one based on selected reference. The DEM II. DIGITAL ELEVATION MODELS (DEMs) produced with Photogrammetric method has approximately 5.5m better accuracy for open and flat, 6.5m better accuracy for forest areas against the DEM The term Digital Elevation Model (DEM) comprises the generated from 1:25000 scale topographic maps.process of representing the elevation characteristics of the SRTM X-band DEM is 4m less accurate for open, terrain in discreet form in a three-dimensional space of a 4,5m less accurate for forest areas against the DEM surface. However, most often it is used to refer specifically to a produced with Photogrammetric method and 9.5m raster or regular grid of spot heights. A Digital Terrain Model less accurate for open, tlm less accurate for forest or DTM contains also information about object locations and areas against the DEM generated from 1:25000 scale actually be a more generic term for any digital representation topographic maps. And at the result, it has been of a topographic surface. A DEM is the simplest form of digital clearly seen that the...

Investigation of temporal baseline effect on DEMs derived from COSMO Sky-Med data

“…Digital Elevation Model (DEM) is defined as a data set that presents the elevation information and characteristics of the topography in 3 dimensions (Sefercik, 2007). DEMs can be used as a base for many analyzes that require elevation information in the field of earth sciences.…”

A comparative appraisal of hydrological behavior of SRTM DEM at catchment level

“…Although several studies confirmed the ±16 m vertical accuracy at 90% confidence level for SRTM DEM, but some other researchers have reported that SRTM has failed to achieve the expected accuracy of ±16 m (Bonnici and Eisner, 2007) or of low accuracy than contour DEM (Sefercik, 2007) or photogrammetric DEM (Bonnici et al, 2013;Li et al, 2013;Nikolakopoulos et al, 2006;Shafique and van der Meijde, 2014;Thomas et al, 2014).…”

Comparison of Accuracy of Two Global DEMs, and the Extracted DEM from the Topographic Map of the Tafilah Governorate

“…DEM data are an essential tool for many applications such as hydrology, climatology, geomorphology and ecology [2][3][4][5][6]. DEMs can be generated using different methodologies that depend on acquisition procedures and techniques, such as satellite-based techniques, field surveying and topographic maps [7][8][9]. Two global DEMs with horizontal resolutions of 90 m and 30 m were freely downloaded for the study area along with the TM (topographic map) to achieve the study goal.…”