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Timeline of Daniel Aguiar

2015
Dec
01
Published new article




Article

Greenhouse gas balance from cultivation and direct land use change of recently established sugarcane ( Saccharum officin...

Published: 01 December 2015 by Elsevier BV in Renewable and Sustainable Energy Reviews

doi: 10.1016/j.rser.2015.07.137

1 Reads | 3 Citations
2013
Dec
01
Published new article




Article

Greenhouse gas mitigation potential from green harvested sugarcane scenarios in São Paulo State, Brazil

Published: 01 December 2013 by Elsevier BV in Biomass and Bioenergy

doi: 10.1016/j.biombioe.2013.08.040

0 Reads | 7 Citations
2013
Jul
01
Published new article






Spatial statistic to assess remote sensing acreage estimates: An analysis of sugarcane in São Paulo State, Brazil

Published: 01 July 2013 by Institute of Electrical and Electronics Engineers (IEEE) in 2013 IEEE International Geoscience and Remote Sensing Symposium - IGARSS

doi: 10.1109/igarss.2013.6723768

After the launching of the Landsat-5/TM in the 1980's, remote sensing based methods appeared as an alternative to obtain agricultural statistics. Using the case study of sugarcane acreage in São Paulo State, this paper compares, at a municipal scale, the differences between the remote sensing based (Canasat Project) and the official (Brazilian Institute of Geography and Statistics - IBGE) estimates of relative sugarcane acreage in 2010. This evaluation was carried out through graphical and spatial statistical analyses. Despite individual divergences, results indicated that on average Canasat and IBGE are in agreement. Moreover, large differences were rarely observed for municipalities with high sugarcane production. The remote sensing based method seems to be of great potential for agricultural statistics as it tends to maintain the consistence of current official agricultural statistics with the benefit of further improving estimates. The spatial statistical analyses showed to be effective to assess remote sensing based acreage estimates.

0 Reads | 0 Citations
2012
Oct
19
Published new article




Article

A Web Platform Development to Perform Thematic Accuracy Assessment of Sugarcane Mapping in South-Central Brazil

Published: 19 October 2012 by MDPI in Remote Sensing

doi: 10.3390/rs4103201

The ability to monitor sugarcane expansion in Brazil, the world’s largest producer and exporter of sugar and second largest producer of ethanol, is important due to its agricultural, economic, strategic and environmental relevance. With the advent of flex fuel cars in 2003 the sugarcane area almost doubled over the last decade in the South-Central region of Brazil. Using remote sensing images, the sugarcane cultivation area was annually monitored and mapped between 2003 and 2012, a period of major sugarcane expansion. The objective of this work was to assess the thematic mapping accuracy of sugarcane, in the crop year 2010/2011, with the novel approach of developing a web platform that integrates different spatial and temporal image resolutions to assist interpreters in classifying a large number of points selected by stratified random sampling. A field campaign confirmed the suitability of the web platform to generate the reference data set. An overall accuracy of 98% with an area estimation error of −0.5% was achieved for the sugarcane map of 2010/11. The accuracy assessment indicated that the map is of excellent quality, offering very accurate sugarcane area estimation for the purpose of agricultural statistics. Moreover, the web platform showed to be very effective in the construction of the reference dataset.

2 Reads | 6 Citations
2012
Aug
01
Published new article




Article

Object Based Image Analysis and Data Mining applied to a remotely sensed Landsat time-series to map sugarcane over large...

Published: 01 August 2012 by Elsevier BV in Remote Sensing of Environment

doi: 10.1016/j.rse.2012.04.011

0 Reads | 61 Citations
2012
Jul
01
Published new article




Conference paper

Frost damage detection in sugarcane crop using MODIS images and SRTM data

Published: 01 July 2012 by Institute of Electrical and Electronics Engineers (IEEE) in 2012 IEEE International Geoscience and Remote Sensing Symposium

doi: 10.1109/igarss.2012.6352315

The sugarcane production in the South-central region of Brazil has more than doubled over the last decade reaching a maximum of 557 million tons in 2010/11. A significant and unexpected decrease was observed in crop year 2011/12 dropping the production to 494 million tons. Several factors contributed to a major crop yield loss including a sudden frost event in São Paulo state. It is difficult to estimate the frost impact but remote sensing images might be useful to quantify the intensity of the damage and its spatial distribution. The objective of this study is to detect and evaluate the extent of the frost damage using MODIS, Landsat, and STRM data. Field work for classification and validation purposes was conducted shortly after frost occurrence. Preliminary analyses indicated that remote sensing satellite images were useful to detect and evaluate the extent the frost damage on sugarcane fields.

0 Reads | 0 Citations
2012
Jul
01
Published new article




Conference paper

Automatic classification of land cover change associated with the Brazilian sugarcane expansion over the last decade

Published: 01 July 2012 by Institute of Electrical and Electronics Engineers (IEEE) in 2012 IEEE International Geoscience and Remote Sensing Symposium

doi: 10.1109/igarss.2012.6352684

MODIS time series have provided high quality data which allows retrieving land use and land cover change (LUCC) history related to sugarcane expansion in Brazil. Although visual interpretation is accurate, automatic classification methods for remotely sensed data should be tested mainly due to the extent of the Brazilian sugarcane area. Thus, this work aims at introducing automatic approaches to classify MODIS time series in order to retrieve LUCC history regarding sugarcane expansion over the last decade in Brazil. Results showed that about 65% and 20% of sugarcane expansion was over pasture and annual crop land, respectively. Although partial results indicated that automatic classification is a promising tool to analyze MODIS time series for LUCC studies, several improvements have to be considered before achieving reliable results.

0 Reads | 0 Citations
2012
Apr
02
Published new article




Article

Remote Sensing Time Series to Evaluate Direct Land Use Change of Recent Expanded Sugarcane Crop in Brazil

Published: 02 April 2012 by MDPI in Sustainability

doi: 10.3390/su4040574

The use of biofuels to mitigate global carbon emissions is highly dependent on direct and indirect land use changes (LUC). The direct LUC (dLUC) can be accurately evaluated using remote sensing images. In this work we evaluated the dLUC of about 4 million hectares of sugarcane expanded from 2005 to 2010 in the South-central region of Brazil. This region has a favorable climate for rain-fed sugarcane, a great potential for agriculture expansion without deforestation, and is currently responsible for almost 90% of Brazilian’s sugarcane production. An available thematic map of sugarcane along with MODIS and Landast images, acquired from 2000 to 2009, were used to evaluate the land use prior to the conversion to sugarcane. A systematic sampling procedure was adopted and the land use identification prior to sugarcane, for each sample, was performed using a web tool developed to visualize both the MODIS time series and the multitemporal Landsat images. Considering 2000 as reference year, it was observed that sugarcane expanded: 69.7% on pasture land; 25.0% on annual crops; 0.6% on forest; while 3.4% was sugarcane land under crop rotation. The results clearly show that the dLUC of recent sugarcane expansion has occurred on more than 99% of either pasture or agriculture land.

3 Reads | 34 Citations
2011
Dec
13
Published new article




Article

Remote Sensing Images in Support of Environmental Protocol: Monitoring the Sugarcane Harvest in São Paulo State, Brazil

Published: 13 December 2011 by MDPI in Remote Sensing

doi: 10.3390/rs3122682

Traditional manual sugarcane harvesting requires the pre-harvest burning practice which should be gradually banned by 2021 for most of São Paulo State, Brazil, on cultivated sugarcane land (terrain slope ≤12%) according to State Law number 11241. To forward the end of this practice to 2014, a “Green Ethanol” Protocol was established in 2007. The present work aims at analyzing five years of continuous sugarcane harvest monitoring, based on remote sensing images, to evaluate the effectiveness of the Protocol, thus helping decision makers to establish public policies to meet the Protocol’s expected goals. During the last five crop years, sugarcane acreage expanded by 1.5 million ha, which was compensated by a correspondent increase in the green harvested land. However, no significant reduction was observed in the amount of pre-harvest burned land over the same period. Based on the current trend, this goal is likely to be achieved one or two years later (2015–2016), which will be five or six years ahead of 2021 as the goal in the State Law number 11241 states. We thus conclude that the“Green Ethanol” Protocol has been effective with a positive impact on the increase of GH, especially on recently expanded sugarcane fields.

1 Reads | 17 Citations
2011
Jun
01
Published new article




Article

Mapeamento das áreas de cana-de-açúcar na região norte fluminense - RJ por uso de técnicas de sensoriamento remoto

Published: 01 June 2011 by FapUNIFESP (SciELO) in Engenharia Agrícola

doi: 10.1590/s0100-69162011000300016

1 Reads | 1 Citations
2011
Jan
18
Published new article




Article

The Soy Moratorium in the Amazon Biome Monitored by Remote Sensing Images

Published: 18 January 2011 by MDPI in Remote Sensing

doi: 10.3390/rs3010185

The Soy Moratorium is a pledge agreed to by major soybean companies not to trade soybean produced in deforested areas after 24th July 2006 in the Brazilian Amazon biome. The present study aims to identify soybean planting in these areas using the MOD13Q1 product and TM/Landsat-5 images followed by aerial survey and field inspection. In the 2009/2010 crop year, 6.3 thousand ha of soybean (0.25% of the total deforestation) were identified in areas deforested during the moratorium period. The use of remote sensing satellite images reduced by almost 80% the need for aerial survey to identify soybean planting and allowed monitoring of all deforested areas greater than 25 ha. It is still premature to attribute the recent low deforestation rates in the Amazon biome to the Soy Moratorium, but the initiative has certainly exerted an inhibitory effect on the soybean frontier expansion in this biome.

1 Reads | 43 Citations
2011
Jan
01
Published new article




Article

An R implementation for Bayesian networks applied to spatial data

Published: 01 January 2011 by Elsevier BV in Procedia Environmental Sciences

doi: 10.1016/j.proenv.2011.07.048

This work aimed to develop an R algorithm for land use classification based on the relationships among the land use and variables associated to its occurrence on remote sensing images. The algorithm was tested for soybean crop identification in the Brazilian Soy Moratorium context. Probability functions were modeled based on the number of pixels within discrete intervals. The result was encouraging with overall classification accuracy greater than 80%, indicating that the method is promising also to be applied for other land use classifications. The R algorithm is available at http://www.dsr.inpe.br/∼mello.

0 Reads | 0 Citations
2010
Jul
01
Published new article






Modis time series to assess pasture land

Published: 01 July 2010 by Institute of Electrical and Electronics Engineers (IEEE) in 2010 IEEE International Geoscience and Remote Sensing Symposium

doi: 10.1109/igarss.2010.5649388

Land use conversion is a key factor in the mitigation of GHG emission. Maximum mitigation can be achieved when degraded pasture land is converted to biofuel crops. Remote sensing images, and in particular the MODIS time series data, have a great potential to asses degraded pasture land. This work has the objective to identify pasture land and its different levels of degradation in Mato Grosso do Sul state, Brazil. MODIS time series were used to obtain vegetation indices and fraction images. The wavelet technique was applied at various levels of decomposition to extract the input parameters in the WEKA J48 classifier. Pasture land was well distinguished from Cerrado. The distinction among different pasture land presented lower performance with best results for pasture with invasive plants followed by good pasture. Pasture land with bare soil patches and termite mounds were not distinguished from other classes of pasture.

0 Reads | 0 Citations
2010
Apr
09
Published new article




Article

Studies on the Rapid Expansion of Sugarcane for Ethanol Production in São Paulo State (Brazil) Using Landsat Data

Published: 09 April 2010 by MDPI in Remote Sensing

doi: 10.3390/rs2041057

This study’s overarching aim is to establish the areal extent and characteristics of the rapid sugarcane expansion and land use change in São Paulo state (Brazil) as a result of an increase in the demand for ethanol, using Landsat type remotely sensed data. In 2003 flex fuel automobiles started to enter the Brazilian consumer market causing a dramatic expansion of sugarcane areas from 2.57 million ha in 2003 to 4.45 million ha in 2008. Almost all the land use change, for the sugarcane expansion of crop year 2008/09, occurred on pasture and annual crop land, being equally distributed on each. It was also observed that during the 2008 harvest season, the burned sugarcane area was reduced to 50% of the total harvested area in response to a protocol that aims to cease sugarcane straw burning practice by 2014 for mechanized areas. This study indicates that remote sensing images have efficiently evaluated important characteristics of the sugarcane cultivation dynamic providing quantitative results that are relevant to the debate of sustainable ethanol production from sugarcane in Brazil.

0 Reads | 92 Citations
2009
Sep
01
Published new article




Article

Imagens de sensoriamento remoto no monitoramento da colheita da cana-de-açúcar

Published: 01 September 2009 by FapUNIFESP (SciELO) in Engenharia Agrícola

doi: 10.1590/s0100-69162009000300011

7 Reads | 5 Citations
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