Effects of spatial resolution on slope and aspect derivation for regional-scale analysis

Author(s)

Grohmann, Carlos H. ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Energy & Environm, BR-05508010 Sao Paulo - Brazil

• Document type: Journal article
• Source: Computers & Geosciences; v. 77, p. 111-117, APR 2015.
• Web of Science Citations: 17

Abstract

This paper investigates differences between morphometric parameters (slope and aspect) derived from a resampled DEM and resampled morphometric data derived from a medium resolution DEM, with examples for three study areas in South America selected to represent flatlands, hilly terrain, and mountain ranges. Using a low resolution DEM for regional scale morphometric analysis is not an optimal choice, since attenuation of elevation will strongly affect the distribution of calculated parameters. Unless bounded by computational constraints, one should choose to derive basic morphometric parameters from higher resolution data, and resample it to a coarser resolution as needed. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 09/17675-5 - Digital terrain analysis and remote sensing applied to geomorphometric characterization of landforms
• Grantee: Carlos Henrique Grohmann de Carvalho
• Support type: Regular Research Grants
• FAPESP's process: 12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
• Grantee: Lúcia Garcez Lohmann
• Support type: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 13/50297-0 - Dimensions US-BIOTA São Paulo: a multidisciplinary framework for biodiversity prediction in the Brazilian Atlantic forest hotspot
• Grantee: Cristina Yumi Miyaki
• Support type: BIOTA-FAPESP Program - Thematic Grants