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Maximum Fraction Images Derived from Year-Based Project for On-Board Autonomy-Vegetation (PROBA-V) Data for the Rapid Assessment of Land Use and Land Cover Areas in Mato Grosso State, Brazil

1
National Institute for Space Research (INPE), Av. dos Astronautas, 1758, CEP: 12.227-010 São José dos Campos, SP, Brazil
2
Embrapa Cerrados, BR-020, km 18, CEP: 73301-970 Planaltina, DF, Brazil
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Author to whom correspondence should be addressed.
Land 2020, 9(5), 139; https://doi.org/10.3390/land9050139
Received: 16 March 2020 / Revised: 17 April 2020 / Accepted: 28 April 2020 / Published: 2 May 2020
(This article belongs to the Special Issue Monitoring Brazilian Natural and Human-modified Landscapes)
This paper presents a new approach for rapidly assessing the extent of land use and land cover (LULC) areas in Mato Grosso state, Brazil. The novel idea is the use of an annual time series of fraction images derived from the linear spectral mixing model (LSMM) instead of original bands. The LSMM was applied to the Project for On-Board Autonomy-Vegetation (PROBA-V) 100-m data composites from 2015 (~73 scenes/year, cloud-free images, in theory), generating vegetation, soil, and shade fraction images. These fraction images highlight the LULC components inside the pixels. The other new idea is to reduce these time series to only six single bands representing the maximum and standard deviation values of these fraction images in an annual composite, reducing the volume of data to classify the main LULC classes. The whole image classification process was conducted in the Google Earth Engine platform using the pixel-based random forest algorithm. A set of 622 samples of each LULC class was collected by visual inspection of PROBA-V and Landsat-8 Operational Land Imager (OLI) images and divided into training and validation datasets. The performance of the method was evaluated by the overall accuracy and confusion matrix. The overall accuracy was 92.4%, with the lowest misclassification found for cropland and forestland (<9% error). The same validation data set showed 88% agreement with the LULC map made available by the Landsat-based MapBiomas project. This proposed method has the potential to be used operationally to accurately map the main LULC areas and to rapidly use the PROBA-V dataset at regional or national levels. View Full-Text
Keywords: spectral unmixing; machine learning; fraction images; cloud computing spectral unmixing; machine learning; fraction images; cloud computing
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MDPI and ACS Style

Godinho Cassol, H.L.; Arai, E.; Eyji Sano, E.; Dutra, A.C.; Hoffmann, T.B.; Shimabukuro, Y.E. Maximum Fraction Images Derived from Year-Based Project for On-Board Autonomy-Vegetation (PROBA-V) Data for the Rapid Assessment of Land Use and Land Cover Areas in Mato Grosso State, Brazil. Land 2020, 9, 139.

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