Uso de veículo aéreo não tripulado na determinação de Índice de vegetação em área de pastagem em Nova Mutum-MT
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2016-07-15
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Universidade Federal de Goiás
Resumo
This study aimed to evaluate the performance of an Unmanned Aerial Vehicle (UAV) used to
analysis of cultivated pasture areas. This evaluation was based on the comparison between
the products of Vegetation Index calculated by orthomosaics from photos acquired by a UAV
and the Percentage of Green collected in the ground level. The UAV Vegetation Index was the
Modified Photochemical Reflectance Index (MPRI). It was held also a comparison between the
Vegetation Indexes obtained with the UAV and an orbital platform being these the MPRI and
the Normalized Difference Vegetation Index (NDVI) respectively. The data were collected
monthly between July and December 2014. For comparison between the Percentage of Green
and the MPRI was used 25 samples distributed along of transect established in ground level
into the pasture area. For comparison between MPRI and NDVI other 15 samples were
distributed along of the pasture area. The Percentage of Green relied on vertical photos
acquired in the ground level. The MPRI resulted from aerial surveys done by UAV’s model
“TIRIBA” that used the Canon PowerShot S100 camera coupled. The orthomosaics from aerial
photos acquired on aerial surveys were generated in the Agisoft PhotoScan to calculate the
MPRI after. The NDVI was calculated from surface reflectance images acquired by Landsat-8
satellite. Has been observed that Percentage of Green and MPRI are correlated and the same
to be observed for MPRI and NDVI. There is also relationship in behavior of these products
over time so was possible to conclude that both products could provide the necessary
information for the characterization of the development of pasture between July and
December 2014. Both products – Percentage of Green, MPRI and NDVI – feature advantages
and limitations: the Percentage of Green is most sensitive for the changes into the pasture
because of their detail high level (spatial resolution) but doesn’t have the income that the
MPRI/UAV has and not provide the analysis of the whole area being necessary use to
sampling; the MPRI/UAV has a higher sensitivity to record of the behavior of pasture when
compared to NDVI/Landsat-8 bus the gain in the area imaged by orbital platform should not
be disregarded. The correlation between Percentage of Green and MPRI and between MPRI
and NDVI also suggests that these products can be used in conjunction to perform the
monitoring of pasture areas.
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LINHARES, Mayklyns Marcos de Almeida. Uso de veículo aéreo não tripulado na determinação de índice de vegetação em área de pastagem em Nova Mutum-MT. 2016. 121 f. Dissertação (Mestrado em Geografia) - Universidade Federal de Goiás, Goiânia, 2016.