Feasibility of CBERS-4A images in urban planning and planted forest mapping in Curvelo, MG
DOI:
https://doi.org/10.6008/CBPC2179-6858.2022.011.0024Keywords:
CBERS-4A, Urban planning, Mapping of planted forests, Object-oriented classificationAbstract
The objective of this work was to verify the potential for thematic accuracy of images from the CBERS-4A constellation in mapping planted forests and their potential for use in urban planning in the municipality of Curvelo/MG. All analyzes and processing were carried out using free data and software from official bodies. Initially, 2 multispectral images, free of clouds, from the month of October 2020 were selected. During the digital processing of the images (conversion of coordinate and reference systems, conversion of data into different formats, mosaic, cropping, etc.) the fusion of bands, uniting the panchromatic image (spatial resolution of 2 m) with the multispectral image (spatial resolution of 8 m), giving rise to a synthetic RGB image with a spatial resolution of 2 meters. Next, object-oriented classification was carried out, considering the following classes: a) Natural Forest, b) Planted Forest (Eucalyptus), c) Undergrowth, d) Agriculture, e) Urban Infrastructure, f) Exposed Soil and g) Rivers and Lakes. To evaluate the accuracy of the mapping, a confusion matrix was generated and, shortly afterwards, the Kappa Index was calculated. Additionally, the mapping carried out was compared with data from MapBiomas. The classified CBERS-4A image had a Kappa Index of 0.838, the value of which is qualified as “Excellent”. This value is identical for the MapBiomas mapping (0.83). The percentage of planted forest in the municipality of Curvelo/MG is 17.18% (56,530 ha) for the mapping derived from CBERS-4A images and 15.48% (51,000 ha) in the MapBiomas mapping. It was possible to observe the high potential of the fused CBERS-4A image in aiding urban planning given the excellent visual quality of the fused image. It was also observed that the classified CBERS-4A image is satisfactory for mapping planted forests and urban infrastructure in the municipality of Curvelo/MG. The research developed is original and as the proposed methodology used only free tools and public data from official bodies, we believe that this measure can contribute to the replicability of the work.
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