Evaluation of the altimetry from SRTM-3 and planimetry from high-resolution PALSAR FBD data for semi-detailed topographic mapping in the Amazon Region

Abstract

The Brazilian Amazon has a deficit of 35% of coverage regarding topographic mapping at semi-detailed (1:100,000) scale. This paper presents an alternative to overcome this scenario using a combination of planialtimetric information from two orbital SAR (Synthetic Aperture Radar) missions. The altimetry was acquired from Shuttle Radar Topography Mission (SRTM), while the planimetry was provided from Fine Beam Dual (FBD) images of the Phased Array L-band Synthetic Aperture Radar (PALSAR) sensor. The research was carried out in the mountainous area of the Serra dos Carajás (Pará State), located on the Amazon region. The quality of the orbital topographic information was evaluated regarding precise planialtimetric measurements acquired from Global Positioning System (GPS) field campaigns. The evaluations were performed following two approaches: (1) the use of Root Mean Square Error (RMSE) and (2) tendency and precision hypothesis tests. The investigation has shown that the planialtimetric quality of the orbital products fulfilled the Brazilian Map Accuracy Standards requirements for 1:100,000 A Class map. Thus, the use of combination of information provided by PALSAR and SRTM-3 data can be considered a promising alternative for production and update of semi-detailed topographic mapping in similar environments of the Amazon region, where topographic information is lacking or presents low quality.

Método de dimensionamento espacial aplicado para vazamentos hipotéticos de depósitos de rejeitos de mineração

“…Observa-se que em certos pontos a mancha se delineia excluindo as áreas com cotas mais elevadas. Rodrigues et al (2011) argumentam sobre a qualidade planialtimétrica dos dados SRTM, havendo a presença de deslocamento da componente vertical, que pode ser parcialmente atenuado durante o processamento dos modelos, porém, destacam o efeito da vegetação na altimetria gerada.…”

Conformity of the NASADEM_HGT and ALOS AW3D30 DEM with the Altitude from the Brazilian Geodetic Reference Stations: A Case Study from Brazilian Cerrado

“…Thus, the orthometric altitudes referenced to the EGM96 geoid model was converted to the orthometric altitudes referenced to the Imbituba vertical datum and SIRGAS 2000 horizontal datum. The following steps were performed, based on the methodologies employed by [ 2 , 48 , 49 ].…”

Uncontacted Waorani in the Yasuní Biosphere Reserve: Geographical Validation of the Zona Intangible Tagaeri Taromenane (ZITT)

“…Three types of Digital Elevation Models (DEM) maps have been used to deeply investigate both the terrain morphology and river dynamics [113]–[116]: an IGM-DEM map [117], a Shuttle Radar Topographic Mission (SRTM) map [79], and a GDEM derived by the Aster satellite [78].…”