Avaliação Da Acurácia Posicional Planimétrica Em Modelos Digitais De Superfície Com O Uso De Feições Lineares

Abstract

Resumo:Atualmente, tem-se aumentado a preocupação com a avaliação da acurácia posicional em dados espaciais, principalmente em dados com informações altimétricas. Contudo, vários trabalhos avaliam apenas a componente altimétrica, desconsiderando a acurácia posicional planimétrica. Assim, este trabalho tem como objetivo avaliar a acurácia posicional planimétrica dos principais MDSs disponíveis gratuitamente para o Brasil, como os modelos SRTM (banda C e X), Aster GDEM versão 2 e TOPODATA. Para a avaliação da acurácia posicional planimétrica dos MDSs, fez-se a extração de feições características do terreno como linhas de cumeadas e linhas de hidrografia numérica. Em seguida, de posse destas feições lineares, aplicou-se o método do Buffer Duplo para avaliar a acurácia posicional planimétrica de acordo com o padrão definido no Decreto-lei n° 89.817/ET-ADGV. Para a comparação destes modelos, utilizou-se como referência um MDS, na escala de 1:25.000, obtido do sensor ALOS/PRISM. Os resultados da avaliação posicional planimétrica apresentaram Classe C na escala 1:100.000 para os MDS SRTM-X e Aster GDEM; para os MDS TOPODATA e SRTM-C, as classificações obtidas foram Classe B e Classe C na escala de 1:250.000, respectivamente. Palavras-chave:Modelo Digital de Superfície, Acurácia Posicional, Feições Lineares. Abstract:Currently, the concern over positional accuracy assessment in spatial data has grown, primarily in data with altimetric data information. However, several studies only assess the altimetric component, disregarding the planimetric positional accuracy. Thus, this work aims to evaluate the planimetric positional accuracy of the main MDSs available for free in Brazil, such as SRTM (band C and X), Aster GDEM version 2 and TOPODATA models. To evaluate the planimetric positional accuracy ridge lines and numerical hydrography lines were extracted as terrain

Comparison Between Absolute and Relative Positional Accuracy Assessment - A Case Study Applied to Digital Elevation Models

“…To obtain surface elevation data, ASTER sensors placed on TERRA satellite captured stereoscopic images between 2000 and 2010, operating in the bands of the near infrared spectrum. The GDEM is the most complete model of the Earth's surface, covering 99% of its surface, between the latitudes of 83 ° N and 83 ° S (Celestino and Philips, 2016;Santos et al, 2016). ASTER GDEM v.2 is provided by the USGS Earth Explorer in the GeoTIFF image format in 1°x1° geographic cutouts, with spatial resolution of 1 arc-second (about 30 meters near the equator).…”

“…The SRTM was a project of NASA and the National Geospatial-Intelligence Agency (NGA), which had the international collaboration of the German Space Agency (Deutsches Zentrum für Luft-und Raumfahrt -DLR) and the Italian Space Agency (Agenzia Spaziale Italiana -ASI) to acquire radar data with the objective of creating the first global altimetric model (USGS, 2015, Santos et al, 2016.…”

Comparison Between the Double Buffer Method and the Equivalent Rectangle Method for the Quantification of Discrepancies Between Linear Features

“…Fonseca Neto et al (2017), Cruz and Santos (2016), Santos et al (2016) and Santos et al (2015) arbitrated for the x value of the buffer the EM that in their works they denominate simply of PEC.…”

“…The DBM has been suggested by Santos et al (2016), Fonseca Neto et al 2017and Cruz and Santos (2016) for the evaluation of the positional accuracy of linear features due to the best results presented in studies developed by Santos et al (2015).…”

“…In Brazil, Fonseca Neto et al (2017) used the Double Buffer Method to determine the planimetric positional accuracy of linear features in the evaluation of the quality of orthoimages generated from a sensor embedded in a drone platform. Santos et al (2016) used the same method to evaluate the planimetric positional accuracy of digital surface models (DSM) from linear features extracted from the models (ridges and drainage lines).…”