Modelos digitales de elevación generados por captura directa e indirecta de datos fuente
Analytical and descriptive methodologies yield basic information on the relief of a watershed, and thereby make it possible to determine the physical parameters needed to analyze projects involving natural resources, such as the comprehensive management of watersheds, environmental impact studi...
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| Publicado en: | Revista de la Facultad de Ciencias Agrarias |
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| Autores principales: | , , , , , , , , , |
| Materias: | |
| Acceso en línea: | https://bdigital.uncu.edu.ar/fichas.php?idobjeto=3181 |
| Sumario: | Analytical and descriptive methodologies yield
basic information on the relief of a watershed, and
thereby make it possible to determine the physical parameters
needed to analyze projects involving natural
resources, such as the comprehensive management
of watersheds, environmental impact studies, and
studies of soil degradation, deforestation, and the
conservation of water resources, among others. All
of these have an important spatial component which
makes the use of Geographic Information Systems
(GIS) extremely helpful. Digital Elevation Models
(DEM) and their derivatives constitute a relevant
part of this source of data. The products derived
from these models, like slope, direction or curvature,
will be as precise as the DEM used to derive them.
Other way, is fundamental to maximize the ability
of the model to represent land variations; for it, is
necessary a correct grid size selection, according to
the available data for its generation. In this work the
topographical quality of six DEMs generated from
two different capture systems of source data and
different grid size. To determinate the accuracy of
DEMs, habitually is used a group of control points
considered like “field truth” which are compared with
the generated by the model in the same geographic
position. The selected area to apply the study, is
located at Arrecifes locality, in Buenos Aires province
(Argentina), and have a surface of approximately
297 acres. The obtained results for both algorithms
and three size grid analyzed, have presented these
results: the algorithm DEM from contourn, a RMSE
of ± 0.11 m (grid size of 1 m), ± 0.11 m (grid size of
5 m) and ± 0.15 m (grid size of 10 m). The algorithm
DEM from vector/points, a RMSE of ± 0.09 m (grid
size of 1 m), ± 0.11 m (grid size of 5 m) and of ± 0.11 m
(grid size of 10 m). The results allow to conclude that
only the DEM generated from field heights points
like source data with the small grid size satisfies the
standards mentioned in the national and international
bibliography. So, it appear as apt for natural resources
projects, concerning to the ecotopo (predial scale).
The rest of the generated DEMs, display a RMSE
that allows to assure their aptitude for the evaluation
of natural resources projects, concerning landscape
unit (group of ecotopos)
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