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The use of LIDAR as a data source for digital elevation models : a study of the relationship between the accuracy of digital elevation models and topographical attributes in northern peatlands

Hasan, A LU orcid ; Pilesjö, P LU and Persson, Andreas LU (2011) In Hydrology and Earth System Sciences Discussions 8(3). p.5497-5522
Abstract
It is important to study the factors affecting estimates of wetness since wetness is crucial in climate change studies. The availability of digital elevation models (DEMs) generated with high resolution data is increasing, and their use is expanding. LIDAR earth elevation data have been used to create several DEMs with different resolutions, using various interpolation parameters, in order to compare the models with collected surface data. The aim is to study the accuracy of DEMs in relation to topographical attributes such as slope and drainage area, which are normally used to estimate the wetness in terms of topographic wetness indices. Evaluation points were chosen from the high-resolution LIDAR dataset at a maximum distance of 10 mm... (More)
It is important to study the factors affecting estimates of wetness since wetness is crucial in climate change studies. The availability of digital elevation models (DEMs) generated with high resolution data is increasing, and their use is expanding. LIDAR earth elevation data have been used to create several DEMs with different resolutions, using various interpolation parameters, in order to compare the models with collected surface data. The aim is to study the accuracy of DEMs in relation to topographical attributes such as slope and drainage area, which are normally used to estimate the wetness in terms of topographic wetness indices. Evaluation points were chosen from the high-resolution LIDAR dataset at a maximum distance of 10 mm from the cell center for each DEM resolution studied, 0.5, 1, 5, 10, 30 and 90 m. The interpolation method used was inverse distance weighting method with four search radii: 1, 2, 5 and 10 m. The DEM was evaluated using a quantile-quantile test and the normalized median absolute deviation. The accuracy of the estimated elevation for different slopes was tested using the DEM with 0.5 m resolution. Drainage areas were investigated at three resolutions, with coinciding evaluation points. The ability of the model to generate the drainage area at each resolution was obtained by pairwise comparison of three data subsets. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Hydrology and Earth System Sciences Discussions
volume
8
issue
3
pages
26 pages
publisher
Copernicus GmbH
ISSN
1812-2108
DOI
10.5194/hessd-8-5497-2011
language
English
LU publication?
yes
id
99c651b0-4415-4b66-b1a0-63da5a3f18b7
date added to LUP
2019-05-29 11:16:51
date last changed
2020-06-23 15:13:45
@article{99c651b0-4415-4b66-b1a0-63da5a3f18b7,
  abstract     = {It is important to study the factors affecting estimates of wetness since wetness is crucial in climate change studies. The availability of digital elevation models (DEMs) generated with high resolution data is increasing, and their use is expanding. LIDAR earth elevation data have been used to create several DEMs with different resolutions, using various interpolation parameters, in order to compare the models with collected surface data. The aim is to study the accuracy of DEMs in relation to topographical attributes such as slope and drainage area, which are normally used to estimate the wetness in terms of topographic wetness indices. Evaluation points were chosen from the high-resolution LIDAR dataset at a maximum distance of 10 mm from the cell center for each DEM resolution studied, 0.5, 1, 5, 10, 30 and 90 m. The interpolation method used was inverse distance weighting method with four search radii: 1, 2, 5 and 10 m. The DEM was evaluated using a quantile-quantile test and the normalized median absolute deviation. The accuracy of the estimated elevation for different slopes was tested using the DEM with 0.5 m resolution. Drainage areas were investigated at three resolutions, with coinciding evaluation points. The ability of the model to generate the drainage area at each resolution was obtained by pairwise comparison of three data subsets.},
  author       = {Hasan, A and Pilesjö, P and Persson, Andreas},
  issn         = {1812-2108},
  language     = {eng},
  number       = {3},
  pages        = {5497--5522},
  publisher    = {Copernicus GmbH},
  series       = {Hydrology and Earth System Sciences Discussions},
  title        = {The use of LIDAR as a data source for digital elevation models : a study of the relationship between the accuracy of digital elevation models and topographical attributes in northern peatlands},
  url          = {http://dx.doi.org/10.5194/hessd-8-5497-2011},
  doi          = {10.5194/hessd-8-5497-2011},
  volume       = {8},
  year         = {2011},
}