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Evaluation of selected methods for extracting digital terrain models from satellite born digital surface models in urban areas

Krauß, Thomas and Arefi, Hossein and Reinartz, Peter (2011) Evaluation of selected methods for extracting digital terrain models from satellite born digital surface models in urban areas. SMPR2011, 18.-19. May 2011, Tehran, Iran.

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Abstract

For the generation of 3D city models from satellite stereo imagery beyond the generation of digital surface models (DSM) from stereo data the next crucial step is the separation of urban 3D objects from ground. To do this the most common method is the derivation of a so called digital terrain model (DTM) from the DSM. The DTM should ideally contain only the surface of the ground on which the urban objects are located. Since only the surface of the objects can be seen from space, sophisticated methods have to be developed to gain information of the bare ground. In this paper selected methods for the extraction of a DTM from a DSM are described and evaluated. The evaluation is done by applying the methods to synthetically generated DSMs. These synthetical DSMs are a combination of ground and typical urban objects put on top of it. The application of the DTM extraction methods should recover in turn the original ground model as good as possible. Also the sum of the obtained DTM and the profile of the urban objects should reconstruct the original DSM. The profile of the urban objects ist often referenced as normalized digital elevation model (nDEM). But in general the equation DSM = DTM + nDEM is not always valid – especially for buildings situated on the slope of a hill. If the nDEM would simply be the difference of DSM – DTM the slope of the hill – contained in the DTM – will be reflected on the roof of the buildings. So also an advanced method for derivation of the nDEM from DSM and DTM is presented and tested.

Item URL in elib:https://elib.dlr.de/72731/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of selected methods for extracting digital terrain models from satellite born digital surface models in urban areas
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krauß, ThomasDLR, MF-PBUNSPECIFIED
Arefi, HosseinDLR, MF-PBUNSPECIFIED
Reinartz, PeterDLR, MF-PBUNSPECIFIED
Date:18 May 2011
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-7
Status:Published
Keywords:digital surface models, digital terrain models, urban areas, simulation
Event Title:SMPR2011
Event Location:Tehran, Iran
Event Type:international Conference
Event Dates:18.-19. May 2011
Organizer:ISPRS & DLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben hochauflösende Fernerkundungsverfahren
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By: Krauß, Thomas
Deposited On:13 Dec 2011 10:57
Last Modified:31 Jul 2019 19:34

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