Comparação entre os Modelos Digitais de Terreno gerados por Radar em Banda P e LiDAR na Amazônia, um estudo de caso no Amapá (Brasil).: Comparison between Digital Terrain Models generated by P-Band Radar and LiDAR in the Amazon, a case study in Amapá (Brazil).

• Autor(a) principal: Tanajura Caldeira, Carlos Rodrigo
• Data de Publicação: 2023
• Outros Autores: Polidori, Laurent, El Hage, Mhamad, Cobacho Ortega Caldeira, Mayara, Bastos Gorgens, Eric, Pierre Henry Balbaud Ometto, Jean
• Tipo de documento: Artigo
• Idioma: por; eng
• Título da fonte: Revista de Geociências do Nordeste
• Texto Completo: https://periodicos.ufrn.br/revistadoregne/article/view/31573

The Digital Terrain Model (DTM) is an important product used in geosciences, but its extraction in dense forest areas is still a challenge. One of the major difficulties in extracting a DTM via remote sensors is in dense forest areas, as the generated information becomes degraded due to the fact that the most commonly used techniques can only measure canopy elevation and not terrain elevation, limiting cartography in areas such as the Amazon. The most appropriate technique for extracting a DTM is airborne LiDAR (Light Detection And Ranging), but there are limitations of time and cost for large areas. P-band radar waves have a great capacity for penetrating through dense vegetation, making it a promising tool for digital terrain modeling in forested areas. This technique was used for the latest update of the cartography of the Amapá state (Brazil). This article aims to evaluate the overall quality of a DTM produced using airborne P-band radar interferometry in relation to LiDAR data (used as a reference) in 4 regions of the Amapá state, using various criteria. In addition to the visual comparison confirming the general similarity of the two products, the difference in terms of elevation and slope was evaluated, with an average error in elevation of -0.52 m, while having a standard deviation and average RMSE below 3 meters, with a difference in slope of approximately -4° and a standard deviation and average RMSE of 4.74° and 6.14°, respectively. This study provides an estimate of the accuracy of P-band radar DTM, both in terms of elevation and slope, which are essential variables for characterizing landforms.