TTE88

Abstract

Currently there are several tools that facilitate the understanding of the earth's

surface and therefore the study of watersheds.

This project was carried out with the purpose of making a geomorphological

comparison of a watershed using two tools, Google Earth and Dron.

The type of research used for this project is exploratory and quantitative

correlational. For this purpose, ten routes with different orientations were defined

in the same area, in order to obtain twenty digital terrain models (DTM),

originating from the information provided by Google Earth and Dron (ten models

per tool). These models were represented in a geographic information system

(GIS), allowing us to have a perspective of the relief of the studied area.

Subsequently, the watersheds were delimited for each of these models and their

respective morphometric parameters were estimated.

In order to make the comparison and observe the distribution of the results

obtained, dispersion measures and graphs of individual values were used. The

measure of dispersion used to compare the variation of the morphometric

parameters is the coefficient of variation by dimensionality.

The results indicate that the morphometric parameters of the basins obtained with

Google Earth present a lower variability compared to those obtained with Dron.

On average, the variability of the drone for the morphometric parameters of a

watershed corresponds to 11.1% and Google Earth corresponds to 6.9%. The

morphometric parameter with the greatest variability between tools corresponds to

the width of the watershed, with a 7% difference in the coefficient of variation

and the one with the least variability between tools is the length of the main

channel with 0.4%.

Evaluating the average of the results obtained, the watershed generated with the

drone has a larger area and perimeter than the watershed delimited with Google

Earth. The amplitude, length of the main channel and distance to the center of

gravity present less significant differences; on the contrary, the slope of the basin

presents the greatest difference between the tools.

Finally, parameters indicative of shape, coincide for both cases that the basin

studied is oblong and elongated.

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