Validation of the Digital Elevation Model (Srtm) With GNSS Surveying Applied to the Mirim Lagoon Hydrographic Basin

Scalco, Patrícia Andréia Paiola; Iescheck, Andrea Lopes; Corrêa, Iran Carlos Stalliviere; Scottá, Fernando Comerlato; Oliveira, Rafael Mastracusa de; Franchini, Ricardo Augusto Lengler

doi:10.1590/s1982-21702018000300026

Cited by 3 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Global models usually present lower heights and the differences amount to several dozen metres. A known fact from the literature is that the absolute vertical accuracy of the SRTM model varies from a few to several metres, depending on the terrain cover [91]. This was also confirmed by this study.…”

Section: Discussionsupporting

confidence: 88%

The Highest Peaks of the Mountains: Comparing the Use of GNSS, LiDAR Point Clouds, DTMs, Databases, Maps, and Historical Sources

Szombara

Róg²,

Kozioł³

et al. 2021

Energies

View full text Add to dashboard Cite

Advances in remote data acquisition techniques have contributed to the flooding of society with spatial data sets and information. Widely available spatial data sets, including digital terrain models (DTMs) from aerial laser scanning (ALS) data, are finding more and more new applications. The article analyses and compares the heights of the 14 highest peaks of the Polish Carpathians derived from different data sources. Global navigation satellite system (GNSS) geodetic measurements were used as reference. The comparison primarily involves ALS data, and selected peaks’ GNSS measurements carried out with Xiaomi Mi 8 smartphones were also compared. Recorded raw smartphone GNSS measurements were used for calculations in post-processing mode. Other data sources were, among others, global and local databases and models and topographic maps (modern and old). The article presents an in-depth comparison of Polish and Slovak point clouds for two peaks. The results indicate the possible use of large-area laser scanning in determining the maximum heights of mountain peaks and the need to use geodetic GNSS measurements for selected peaks. For the Polish peak of Rysy, the incorrect classification of point clouds causes its height to be overestimated. The conclusions presented in the article can be used in the dissemination of knowledge and to improve positioning methods.

show abstract

Section: Discussionsupporting

confidence: 88%

The Highest Peaks of the Mountains: Comparing the Use of GNSS, LiDAR Point Clouds, DTMs, Databases, Maps, and Historical Sources

Szombara

Róg²,

Kozioł³

et al. 2021

Energies

View full text Add to dashboard Cite

show abstract

“…Table 3, presented in Results Section, briefly confirms the altimetry models conformity to literature studies and the technical descriptions published by models producers (Morais, 2017;Morais et al 2017;Scalco et al 2018;França et al 2019 andOrlandi et al 2019). The free cost low quality models presented an overall similar quality with a slight advantage for the ALOS_ASF over SRTM.…”

Section: Discussionsupporting

confidence: 79%

“…A previous step of adherence assessment is an evaluation of the models ALS, ALOS_ASF and SRTM based in a relative comparison to increase the consistency of the study. It is well known, either by technical descriptions or by literature studies (Morais, 2017;Morais et al 2017;Scalco et al 2018;França et al 2019 andOrlandi et al 2019) that ALS has the best accuracy among the three models, thus an internal evaluation was performed by extracting the basic statistics (minimum, maximum, mean, standard deviation and RMSE) from the models ALS, ALOS_ASF and SRTM, and also from the subtraction models (ALS-ALOS_ASF) and (ALS-SRTM). These statistics values provide a general view of ALOS_ASF and SRTM accuracy compared to ALS for checking if they corroborate literature studies.…”

Section: Assessment Of Results Adherencementioning

confidence: 99%

See 1 more Smart Citation

Assessment of Digital Terrain Models in Dam Break Simulation Studies

et al. 2021

View full text Add to dashboard Cite

Dams are structures built for controlling the flow of water for many useful purposes such as water supply, power generation, retention of mining and industrial waste, as well as recreation and flood control. However, they bring together some risk of dam body collapse causing damage for the dam downstream areas. Therefore, hypothetical dam break studies which provide mapping of areas potentially attainable in the event of a rupture are especially important for planning actions aiming minimization of associated losses. The aim of this research is to assess the degree of adherence or similarity between flood maps obtained by simulation studies and those effectively obtained from the collapse itself occurred in Dam I owned by Vale SA on January 25, 2019. The study focuses mainly on comparing the effects over the simulated flood maps caused by use of different representation of dam downstream topography relief, namely Shuttle Radar Topography Mission (SRTM), Advanced Land Observing Satellite from Alaska Satellite Facility (ALOS_ASF) and Airborne Laser Scanning (ALS) models. The simulations were performed using the HEC-RAS software developed by the US Army Corps of Engineers considering hypothesis of strong influence of relief in flood mapping results. In this way, three simulation tests were carried out for evaluation and discussion. In the first simulation, the digital terrain model derived from ALS was used. The second simulation was carried out associating the digital surface model ALOS_ASF with a spatial resolution of 12.5 m. Finally, the SRTM digital elevation model with 30 m spatial resolution provided by the United States Geological Survey (USGS) was used in third simulation. Results showed better adherence to simulations using data from ALS. This was verified by visual analysis over high resolution orthorectified images and by calculating statistics indicators such as the (F) index. Conclusions pointed out that flood patches resulting from simulation are critical tools for taking actions involving areas and populations to be affected, so the best relief model technologies like ALS data should be used in simulation.

show abstract

“…Due to the advancement of technology, the use of digital elevation models elaborated from SAR (Synthetic Aperture Radar) data has become widespread and used in various fields of science and many of them are freely available. Good examples of quality control tests involving these products are reported in Callahanand Berber (2022), Alba-Fernández (2021), Ariza-López and Reinoso-Gordo (2021), Rodríguez-Avi (2021), Ariza-López et al (2017), Ariza-López and Chicaiza Mora (2018), Boulomytis et al (2017), Egg et al (2013), Ferreira (2014), França et al (2019), Mesa-Mingorance et al (2017), Mesa-Mingorance; Ariza-López (2020), , , Mozas-Calvache et al (2017), Orlandi et al (2019), Polidori et al (2014), Santos et al (2016), Scalco et al (2018), among others.…”

Section: Introductionmentioning

confidence: 99%

Cartographic Accuracy Standard (CAS) of the digital terrain model of the digital and continuous cartographic base of the state of Amapá: case study in the city of Macapá

Filho

Cornero²,

Pereira³

et al. 2022

Bol. Ciênc. Geod.

View full text Add to dashboard Cite

The Cartographic Accuracy Standard (CAS) is a quality parameter used by the Brazilian standard to estimate the positional quality of cartographic products in their degree of precision, also including altimetry. The Digital and Continuous Cartographic Base of Amapá -BCDCA has a large amount of freely available spatial information, for the study of its territory within the state of Amapá. This project, a partnership between the Government of the State of Amapá and the Directorate of Geographical Services of the Brazilian Army (DSG), obtained a large amount of SAR data by interferometry. Among the resulting products, the Digital Terrain Model -DTM has a wide range of applications: watershed analysis, infrastructure program, diagnosis of environmental risks and so many others. Therefore, the present work aims to evaluate the altimetric data (DTM) provided by the BCDCA through 2172 orthometric points calculated from the Brazilian Network for Continuous Monitoring -RBMC measured in the field in the city of Macapá, capital of the State of Amapá. For the level curves, the results presented class A for the 1: 10 000 scale, at an equidistance of 5 m, showing that the DTM product is highly reliable for urban applications.

show abstract

Validation of the Digital Elevation Model (Srtm) With GNSS Surveying Applied to the Mirim Lagoon Hydrographic Basin

Cited by 3 publications

References 17 publications

The Highest Peaks of the Mountains: Comparing the Use of GNSS, LiDAR Point Clouds, DTMs, Databases, Maps, and Historical Sources

The Highest Peaks of the Mountains: Comparing the Use of GNSS, LiDAR Point Clouds, DTMs, Databases, Maps, and Historical Sources

Assessment of Digital Terrain Models in Dam Break Simulation Studies

Cartographic Accuracy Standard (CAS) of the digital terrain model of the digital and continuous cartographic base of the state of Amapá: case study in the city of Macapá

Contact Info

Product

Resources

About