Accuracy of the new generation elevation models

Hubáček, Martin; Kratochvíl, Vlastimil; Zerzan, Pavel; Ceplova, Lucie; Brenova, Marie

doi:10.1109/miltechs.2015.7153725

“…The multiple average error (± 2σ) was chosen because of the known fact that for onedimensional normal distribution the probability density of the observed phenomenon reaches for this value about 95% (Böhm 1990 The analysis of the accuracy of the models was focused primarily on assessing the accuracy in both the open and forested terrains. The results showed that despite a presence of systematic effects the models comply with the declared accuracy in both the open terrain and the areas covered by vegetation (Hubacek et al 2015).…”

Section: Verification Of Accuracymentioning

confidence: 71%

“…Verification is performed by the CUZK as a principle producer of these models and also by the independent organizations such as universities. Already obtained results of verification can be found for example in (Mikita et al 2013, Hubacek et al 2014, Silhavy and Cada 2015. The following verification methods are recommended: (Brazdil et al 2012a(Brazdil et al , 2012b: -special calibrating bases -known geodetic heights -terrain height measurement in selected areas.…”

Section: Verification Of Accuracymentioning

confidence: 99%

Analysis of Influence of Terrain Relief Roughness on Dem Accuracy Generated From Lidar in the Czech Republic Territory

Hubáček¹,

Kovařík²,

Kratochvil³

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Digital elevation models are today a common part of geographic information systems and derived applications. The way of their creation is varied. It depends on the extent of area, required accuracy, delivery time, financial resources and technologies available. The first model covering the whole territory of the Czech Republic was created already in the early 1980's. Currently, the 5th DEM generation is being finished. Data collection for this model was realized using the airborne laser scanning which allowed creating the DEM of a new generation having the precision up to a decimetre. Model of such a precision expands the possibilities of employing the DEM and it also offers new opportunities for the use of elevation data especially in a domain of modelling the phenomena dependent on highly accurate data. The examples are precise modelling of hydrological phenomena, studying micro-relief objects, modelling the vehicle movement, detecting and describing historical changes of a landscape, designing constructions etc. Due to a nature of the technology used for collecting data and generating DEM, it is assumed that the resulting model achieves lower accuracy in areas covered by vegetation and in built-up areas. Therefore the verification of model accuracy was carried out in five selected areas in Moravia. The network of check points was established using a total station in each area. To determine the reference heights of check points, the known geodetic points whose heights were defined using levelling were used. Up to several thousands of points were surveyed in each area. Individual points were selected according to a different configuration of relief, different surface types, and different vegetation coverage. The sets of deviations were obtained by comparing the DEM 5G heights with reference heights which was followed by verification of tested elevation model. Results of the analysis showed that the model reaches generally higher precision than the declared one in majority of areas. This applies in particular to areas covered by vegetation. By contrast, the larger deviations occurred in relation to the slope of the terrain, in particular in the micro-relief objects. The results are presented in this article.

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“…The analysis of the accuracy of the models was focused primarily on assessing the accuracy in both the open and forested terrains. The results showed that despite a presence of systematic effects the models comply with the declared accuracy in both the open terrain and the areas covered by vegetation (Hubacek et al 2015).…”

Section: Verification Of Accuracymentioning

confidence: 71%

Analysis of Influence of Terrain Relief Roughness on Dem Accuracy Generated From Lidar in the Czech Republic Territory

Hubáček

¹

,

Kovařík

²

,

Kratochvíl

³

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:Digital elevation models are today a common part of geographic information systems and derived applications. The way of their creation is varied. It depends on the extent of area, required accuracy, delivery time, financial resources and technologies available. The first model covering the whole territory of the Czech Republic was created already in the early 1980's. Currently, the 5th DEM generation is being finished. Data collection for this model was realized using the airborne laser scanning which allowed creating the DEM of a new generation having the precision up to a decimetre. Model of such a precision expands the possibilities of employing the DEM and it also offers new opportunities for the use of elevation data especially in a domain of modelling the phenomena dependent on highly accurate data. The examples are precise modelling of hydrological phenomena, studying micro-relief objects, modelling the vehicle movement, detecting and describing historical changes of a landscape, designing constructions etc. Due to a nature of the technology used for collecting data and generating DEM, it is assumed that the resulting model achieves lower accuracy in areas covered by vegetation and in built-up areas. Therefore the verification of model accuracy was carried out in five selected areas in Moravia. The network of check points was established using a total station in each area. To determine the reference heights of check points, the known geodetic points whose heights were defined using levelling were used. Up to several thousands of points were surveyed in each area. Individual points were selected according to a different configuration of relief, different surface types, and different vegetation coverage. The sets of deviations were obtained by comparing the DEM 5G heights with reference heights which was followed by verification of tested elevation model. Results of the analysis showed that the model reaches generally higher precision than the declared one in majority of areas. This applies in particular to areas covered by vegetation. By contrast, the larger deviations occurred in relation to the slope of the terrain, in particular in the micro-relief objects. The results are presented in this article.

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“…The key approach of the article, i.e., identifying the influence of slope accuracy on the results of CCM analyses, was based on both national and international studies. The basic methodology of analysis of elevation models was given in [4]. The study compared the accuracy of heights of terrain models with measured values in the field and assigned them specific output statistics.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Quality of Digital Elevation Data on the Modelling of Terrain Vehicle Movement

Rybanský

¹

,

Rada

²

2022

Applied Sciences

2

0

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This study investigated digital terrain models and options for their evaluation and effective usage. The most important result of this study was the introduction of the slope reduction method for low-detail elevation models. It enabled accurate results of passability analyses by performing adjustments of slopes. In addition, the goal was to determine the strengths and weaknesses of selected data for use in cross-country mobility analyses, followed by recommendations on how to use these databases efficiently to obtain accurate results. The selection of elevation databases (1 m, 5 m, 10 m, 30 m) was determined by the focus of data development projects of NATO and current scientific research projects of the Ministry of Defence of the Czech Republic. Key findings showed potential for use in practise for all tested elevation models. Efficient usage of low-detail models in CCM analyses is limited; nevertheless, they can be augmented with additional vector data or automated remote-sensing technologies.

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Accuracy of the new generation elevation models

Cited by 15 publications

References 7 publications

Analysis of Influence of Terrain Relief Roughness on Dem Accuracy Generated From Lidar in the Czech Republic Territory

Analysis of Influence of Terrain Relief Roughness on Dem Accuracy Generated From Lidar in the Czech Republic Territory

Analysis of Influence of Terrain Relief Roughness on Dem Accuracy Generated From Lidar in the Czech Republic Territory

The Influence of the Quality of Digital Elevation Data on the Modelling of Terrain Vehicle Movement

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