@Article{ValerianoRoss:2017:ReLoGe,
author = "Valeriano, M{\'a}rcio de Morisson and Rossetti, Dilce de
F{\'a}tima",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "Regionalization of local geomorphometric derivations for
geological mapping in the sedimentary domain of central
Amaz{\^o}nia",
journal = "Computers and Geosciences",
year = "2017",
volume = "100",
pages = "46--56",
month = "Mar.",
keywords = "Amaz{\^o}nia, Geological mapping, Geomorphometry, Sedimentology,
SRTM.",
abstract = "This paper reports procedures to prepare locally derived
geomorphometric data for geological mapping at regional scale in
central Amaz{\^o}nia. The size of the study area, approximately
1.5 million km2, and the prevailing flat topography of the
targeted environment were the constraints motivating the aims, at
spatial and numerical synthesis of the detailed geomorphometric
information derived from SRTM DEM. The developed approach
consisted in assigning single (average) values to terrain patches,
to represent the regional distribution of pixel-based
geomorphometric information (slope, profile curvature and relative
relief). In analogy to the nature of sedimentary packs, patches
were established as contiguous elevation strata, constructed
through a procedure combining segmentation, filterings and range
compressions. For slope only, pre-processing of locally derived
data with median filtering effectively avoided the typical
flattening of the regionalized results due to input distribution
characteristics. Profile curvature was transformed into absolute
values and thus a different meaning from the original (pixel)
variable was considered in the interpretation, also avoiding the
compensation of original values (positive and negative) tending to
zero value when averaged through a regionally flat extension.
Examinations near major river valleys showed patched elevation to
depict alluvial terraces. In the interfluves and floodplains,
contrasting patterns in the averaged variables among patches of
similar elevations allowed the recognition of important relief
features. In addition to the reduction of the distribution ranges,
the correlation between regionalized geomorphometric variables was
higher than observed in the originally local data, due to the
thematic synthesis following regionalization. Depth of dissection,
claimed to be related to the relative age of sedimentary units,
was the main factor to explain the overall variations of the
geomorphometric results. The developed regionalization process
improved the potential of local geomorphometric data for updating
and revision of geological maps and for guiding future surveys in
the sedimentary domain of Amaz{\^o}nia.",
doi = "10.1016/j.cageo.2016.12.002",
url = "http://dx.doi.org/10.1016/j.cageo.2016.12.002",
issn = "0098-3004",
language = "en",
targetfile = "valeriano_regionalization.pdf",
urlaccessdate = "27 abr. 2024"
}