Abstract
Abstract. In the last decades, the Brazilian Cerrado biome has undergone major transformations due to the expansion of the agricultural frontier. The region called MATOPIBA acronym for states Maranhão, Tocantins, Piauí, and Bahia can be considered very attractive for agricultural expansion. The Cerrado predominates in the MATOPIBA region (91% of the area), also having small areas of the Amazon and Caatinga biomes to the northeast and east, respectively. In this work, we will present a study to identify center pivot irrigation systems in the MATOPIBA region using remote sensing images from Landsat-8 satellite. The methodology is based on the use of robust edge detection techniques such as Canny, Circular Hough Transform (CHT) and time series extraction through the Moderate Resolution Imaging Spectroradiometer (MODIS) product MOD13Q1 which has two vegetation indices NDVI and EVI. These time series will be used to filter the detected circles, seeking to eliminate the circles that do not correspond to center pivots. Our approach detected 80% of the center pivots mapped by the Brazilian National Water Agency (ANA) used as a knowledge base. The states with better detection were Piauí and Bahia that showed the accuracy of 90% and 85% respectively, Maranhão obtained 57% and Tocantins 41%.
Highlights
Brazil is currently expanding its agricultural activity towards the Cerrado
Based on the aforementioned considerations, this paper proposes a novel approach to locating and quantifying center pivot irrigation systems based on objects detection using Circular Hough Transform (CHT) over a maximum vegetation response field (Greenest Pixel) and time series analysis of vegetation indices
Another information used was the maximum response of vegetation, getting the pixel of major value from product Normalized Difference Vegetation Index (NDVI) estimated from bands of Operational Land Imager (OLI) on Landsat 8 (Roy et al, 2014) for period of study
Summary
Brazil is currently expanding its agricultural activity towards the Cerrado. There is an indication that the expansion in this area occurred mainly due to the Soy Moratorium in the Amazon Biome (MAPA, 2017). It is important to mention that agricultural expansion in this area impacts mainly native vegetation, and water resources are under pressure, especially in highly mechanized crops. Irrigation is an agricultural practice that employs a set of equipment and techniques to address the total or partial deficiency of water for cultivation. Irrigation activity in Brazil is responsible for the largest volume withdrawal (969 m3/s) and consumption (745 m3/s), this means about 46% of total water withdrawal (2105 m3/s) and 67% of total water consumption (1110 m3/s) (Figure 1) (ANA, 2017)
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