Assessing height precision of laser altimetry dems

Marc Crombaghs, S.J. Oude Elberink, Regine Brügelmann, Erik De Min

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

15 Citations (Scopus)

Abstract

The new Dutch national digital elevation model (DEM), acquired with laser altimetry, is almost complete. The Dutch Survey Department fulfils an intermediary function between laser data suppliers and final users of the DEM. One of the most important tasks of the Survey Department is to guarantee the quality of the delivered laser DEMs to the users. For this purpose, a new height error description scheme is developed, allowing to quantify error effects at different scales. Such a new error description scheme was necessary because the former quality description of DEMs was insufficient. The error behaviour of laser altimetry data, acquired by a complex system of different sensors, cannot be expressed by solely two parameters: a bias and a standard deviation. The former and the new error description scheme will be addressed together with methods to quantify the differently scaled error components. Among them are cross correlation techniques, empirical covariance function analysis from geostatistics and 1d strip adjustment. The contractual demands for maximal allowed error amplitudes, derived from real data, will be presented. The benefit of the error description scheme for DEM users will be illustrated by propagating the error components to the height precision of derived products. Summarizing, it can be stated that this paper deals with the height precision of laser altimetry DEMs and the effects of the different error components on the measured heights. This paper does however not aspire to give methods for eliminating or minimizing these errors.

Original languageEnglish
Title of host publication2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision
Place of PublicationGraz
PublisherInternational Society for Photogrammetry and Remote Sensing (ISPRS)
Pages1-6
Number of pages6
Volume34
Publication statusPublished - 1 Jan 2002
Event2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision, PCV 2002 - Graz, Austria
Duration: 9 Sep 200213 Sep 2002
https://www.isprs.org/proceedings/XXXIV/part3/

Publication series

NameInternational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
PublisherCopernicus
ISSN (Print)1682-1750

Conference

Conference2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision, PCV 2002
CountryAustria
CityGraz
Period9/09/0213/09/02
Internet address

Fingerprint

altimetry
digital elevation model
laser
Lasers
geostatistics
sensor
supplier
Large scale systems
guarantee

Keywords

  • DEM/DTM
  • Height precision
  • Laser altimetry
  • Quality
  • Strip adjustment

Cite this

Crombaghs, M., Oude Elberink, S. J., Brügelmann, R., & De Min, E. (2002). Assessing height precision of laser altimetry dems. In 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision (Vol. 34, pp. 1-6). (International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives). Graz: International Society for Photogrammetry and Remote Sensing (ISPRS).
Crombaghs, Marc ; Oude Elberink, S.J. ; Brügelmann, Regine ; De Min, Erik. / Assessing height precision of laser altimetry dems. 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision. Vol. 34 Graz : International Society for Photogrammetry and Remote Sensing (ISPRS), 2002. pp. 1-6 (International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives).
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Crombaghs, M, Oude Elberink, SJ, Brügelmann, R & De Min, E 2002, Assessing height precision of laser altimetry dems. in 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision. vol. 34, International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, International Society for Photogrammetry and Remote Sensing (ISPRS), Graz, pp. 1-6, 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision, PCV 2002, Graz, Austria, 9/09/02.

Assessing height precision of laser altimetry dems. / Crombaghs, Marc; Oude Elberink, S.J.; Brügelmann, Regine; De Min, Erik.

2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision. Vol. 34 Graz : International Society for Photogrammetry and Remote Sensing (ISPRS), 2002. p. 1-6 (International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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AB - The new Dutch national digital elevation model (DEM), acquired with laser altimetry, is almost complete. The Dutch Survey Department fulfils an intermediary function between laser data suppliers and final users of the DEM. One of the most important tasks of the Survey Department is to guarantee the quality of the delivered laser DEMs to the users. For this purpose, a new height error description scheme is developed, allowing to quantify error effects at different scales. Such a new error description scheme was necessary because the former quality description of DEMs was insufficient. The error behaviour of laser altimetry data, acquired by a complex system of different sensors, cannot be expressed by solely two parameters: a bias and a standard deviation. The former and the new error description scheme will be addressed together with methods to quantify the differently scaled error components. Among them are cross correlation techniques, empirical covariance function analysis from geostatistics and 1d strip adjustment. The contractual demands for maximal allowed error amplitudes, derived from real data, will be presented. The benefit of the error description scheme for DEM users will be illustrated by propagating the error components to the height precision of derived products. Summarizing, it can be stated that this paper deals with the height precision of laser altimetry DEMs and the effects of the different error components on the measured heights. This paper does however not aspire to give methods for eliminating or minimizing these errors.

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KW - Quality

KW - Strip adjustment

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BT - 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision

PB - International Society for Photogrammetry and Remote Sensing (ISPRS)

CY - Graz

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Crombaghs M, Oude Elberink SJ, Brügelmann R, De Min E. Assessing height precision of laser altimetry dems. In 2002 International Symposium of ISPRS Commission III on Photogrammetric Computer Vision. Vol. 34. Graz: International Society for Photogrammetry and Remote Sensing (ISPRS). 2002. p. 1-6. (International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives).