Generation of a Digital Terrain Model (DTM) Fusioning WV-2 Images and RTK-derived Topobathymetric Data

Autor: Elton Vicente Escobar Silva, Cláudia Maria de Almeida, Rômulo Marques-Carvalho, João Vitor Roque Guerrero, Cleber Gonzales de Oliveira
Jazyk: English<br />Portuguese
Rok vydání: 2024
Předmět:
Zdroj: Revista Brasileira de Cartografia, Vol 76, Iss 0a (2024)
Druh dokumentu: article
ISSN: 0560-4613
1808-0936
DOI: 10.14393/rbcv76n0a-70372
Popis: Digital terrain models (DTMs) are digital elevation models (DEMs) that represent the bare ground surface. They are created by multiple sources, including satellite remote sensing, aerial photography, and ground-based surveys, and are often combined with other data sources to create highly detailed models. As the demand for accurate and detailed information about the Earth's surface continues to grow, DTMs have become an increasingly important tool for researchers in different fields. This study aims to create a DTM with a spatial resolution of 0.50 m for São Caetano do Sul, São Paulo, Brazil, integrated with a topobathymetric map of three water courses running along the borders of the study area. For the conventional DTM generation, a WV-2 stereo pair was used. A total of 55 ground control points (GCPs) were collected using the GNSS-RTK method, being 60% used for model building and 40% employed for validation. The topobathymetric survey was accomplished using a GNSS-RTK device placed along the analyzed open streams. For validation purposes, we used bias and MAE metrics. Overall, the methodology presented in this article provides a useful approach for generating high-resolution DTMs that can be used in a range of applications, especially in urban hydrodynamic studies.
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