Mapeo de lineamientos a partir de un DEM (SRTM3): desarrollo y aplicaciones para el estudio de un área de los Andes Patagónicos Septentrionales

Authors

  • Ernesto Gallegos Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires
  • Carmen I. Martínez Dopico Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad deBuenos Aires
  • Yanina Berbeglia Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires

Keywords:

Mapping, DEM, SRTM, Lineaments, Patagonian Andes

Abstract

This paper explores the usefulness of mapping lineaments with shaded relief maps produced by satellite image analysis software from Digital Elevation Models (DEM) of three seconds spatial resolution. The area of study is located between 39ºS and 39º30´S and between 71ºW and 71º30’W and three shaded relief maps were use with incident light at 45º from the horizontal and azimuths of 120º, 240º and 360º. Three operators mapped lineaments separately in the different images obtaining a result of nine independent maps. Reproducible lineaments were considered only those mapped in at least two shaded relief maps by at least two operators or by three operators in at least one image, in the end 23 lineaments were obtained. The tendencies observed were 55º, 106º, 140º and 153º. These lineaments were compared with lineaments mapped in a GeoCoverTM Landsat Enhanced Thematic Mapper Imagery ortorrectified compressed mosaic, in the geologic map 1:200.000 (SEGEMAR) and in topographic maps 1: 50.000 (IGM). Some lineaments that were clearly identified with the
DEM were not observed in the geological and topographic maps or in the Landsat imagery. The authors consider there are certain advantages in applying digital elevation models in the mapping of regional lineaments: 1) the users can control the incident angle and its azimuth; 2) The working scale can be change as needed; 3) in contrast to aerial photography, the satellite data have no deformation and it doesn't show any kind influences with anthropologic features or interference in the interpretation due to vegetation. Another advantage of the DEM (SRTM3 V2) and the GeoCover™ image used in this procedure is that the data is for free access and almost cover all the Earth. The correlation between the presented technique and geology, faults and fractures 44 suggest that DEM can be a very important component in the geological mapping. The obtained lineaments must be checked with the structural information obtained in the field to be validated.

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References

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Published

2008-12-12

How to Cite

Gallegos, E., Martínez Dopico, C. I., & Berbeglia, Y. (2008). Mapeo de lineamientos a partir de un DEM (SRTM3): desarrollo y aplicaciones para el estudio de un área de los Andes Patagónicos Septentrionales. Geoacta, 33, 43–47. Retrieved from https://revistas.unlp.edu.ar/geoacta/article/view/13403

Issue

Vol. 33 (2008)

Section

Scientific work

License

Copyright (c) 2008 Ernesto Gallegos, Carmen I. Martínez Dopico, Yanina Berbeglia

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