ANÁLISE DA QUALIDADE DE SUPERFÍCIES BATIMÉTRICAS DE REFERÊNCIA PARA USO EM INFRAESTRUTURA DE DADOS ESPACIAIS MARINHOS

Abstract

In the last years, bathymetric data has presented potential use beyond those restricted to the safety of navigation, varying since of knowledge of the territory, defense, economy, scientific research, external affairs to others. Because of difficulties inherent from their survey, which could involve the improvement of measurement’s technics and high costs, there are many initiatives looking for a seabed mapping suitable of different scales: local, regional and global. Unfortunately, it is still possible to realize the negative impacts from an inefficient availability of that spatial data information for the national researches. Regarding the complex and huge volume of this type of spatial data, recent works present the Marine Spatial Data Infrastructures (MSDI) concept as the best approach to deal with data management, storage, and sharing. So, committed to Brazilian National Spatial Data Infrastructure (INDE) and the Policy of Open Data and Information Access by Directorate of Hydrography and Navigation (NAD-DHN), aligned with the technical guidelines from International Hydrographic Organization (IHO) and Intergovernmental Oceanographic Commission (ICO), this work proposes to analyze the current bathymetric data available and presents a study over a part of a bathymetric surface created by LEPLAC (Brazilian Continental Shelf Survey Project). This action aims to provide a support to an unpublished qualification of this regional bathymetric surface in order to allow it to be used as a reference for national scientific studies. The methodology developed for it concerns on an application of a set of statistical tools capable to support quantitative and qualitative analyses, by the comparison of this surface (LEPLAC Sul) against others digital terrain models available (as ETOPO1 and GEBCO_2014) and a bathymetric data control derived from hydrographic surveys. The tests results show the LEPLAC Sul surface has achieved the highest index of correlation and determination, in addition the lowest value of RMSE (Root Mean Square Error) related to the data control. Furthermore, the bathymetric models GEBCO_2014 and ETOPO1 presented the existence of artifacts; while the LEPLAC Sul was the only one without it. Thus, the LEPLAC Sul surface looks capable to contribute to the implementation of a MSDI, presenting itself as an efficient reference to further scientific researches, like the climate and oceanographic modeling or the detection and set of marine geomorphological provinces and the terrestrial boundaries. Finally, this paper intends to promote the discussion of national interchanges policy of hydrographic data using the best practices involved in the management of sustainable technological solutions.