This page collects deforestation alert data published by Brazil’s National Institute for Space Research (INPE) and Imazon, a Brazilian NGO. INPE's system is call DETER, while Imazon’s is called SAD.

As explained here, month-to-month deforestation is highly variable. Short-term, alert-based deforestation detection systems do not penetrate cloud cover, so during the rainy season — from roughly November to April — estimates are notoriously unreliable when compared to the same month a year earlier. Furthermore, most forest clearing in the Amazon occurs when it is dry. So if the dry season is early, deforestation may increase earlier than normal. For these reasons, the most accurate deforestation comparisons are made year-on-year. For Brazil, the deforestation “year” ends July 31: the peak of the dry season when the largest extent of forest is typically visible via satellite.

Short-term data isn’t useless though — it can provide insights on trends, especially over longer periods of time. Generally, comparing 12 consecutive months of alert data will provide a pretty good indication of deforestation relative to other years. Therefore the charts below include monthly data as well as the 12-month moving average (Trailing Twelve Months = "TTM").

Monthly deforestation alert data for the "Legal Amazon" in Brazil according to INPE and Imazon.

Last update: 2019-Sep-8

Table: Monthly deforestation in the Brazilian Amazon. All figures in square kilometers

MonthDETERDETER TTMSADSAD TTM
2008-041,1249,1901565,707
2008-051,0969,0642945,603
2008-068718,5366125,716
2008-073247,8352765,031
2008-087578,4001024,470
2008-095878,4573213,679
2008-105418,5541023,257
2008-113558,013612,251
2008-121777,342502,233
2009-012226,925512,202
2009-021436,343622,201
2009-03186,214572,144
2009-04375,1271212,109
2009-051244,1551571,972
2009-065783,8621501,510
2009-078364,3755321,766
2009-084984,1162731,937
2009-094003,9292161,832
2009-101763,5641941,924
2009-11723,281741,937
2009-12 3,104161,903
2010-01232,905631,915
2010-021852,947881,941
2010-03522,981761,960
2010-04522,996651,904
2010-051102,982961,843
2010-062442,6471721,865
2010-074852,2961551,488
2010-082652,0632101,425
2010-094482,1111701,379
2010-103892,3241531,338
2010-111212,372651,329
2010-12212,3941751,488
2011-01362,407831,508
2011-0212,223631,483
2011-031162,287461,453
2011-044772,7122981,686
2011-052682,8711651,755
2011-063132,940991,682
2011-072252,680931,620
2011-081632,5782401,650
2011-092542,3841701,650
2011-103862,3811021,599
2011-111332,393161,550
2011-12752,446401,415
2012-01222,432331,365
2012-023072,7371071,409
2012-03602,681531,416
2012-042332,437711,189
2012-05992,268431,067
2012-061082,062351,003
2012-072142,0511401,050
2012-085222,4102321,042
2012-092832,4394311,303
2012-102772,3314871,688
2012-112052,403551,727
2012-121312,459821,769
2013-0192,447351,771
2013-022702,410451,709
2013-03282,378801,736
2013-041472,2931401,805
2013-054652,659841,846
2013-062102,7621841,995
2013-072172,7661522,007
2013-082892,5321851,960
2013-094432,6921031,632
2013-101552,569431,188
2013-111082,472371,170
2013-12932,434561,144
2014-01752,5001071,216
2014-021192,349111,182
2014-03532,374201,122
2014-041662,3941001,082
2014-052712,2001851,183
2014-065352,5258431,842
2014-077293,0363552,045
2014-088903,6384372,297
2014-097363,9314022,596
2014-102984,0742442,797
2014-11774,0431952,955
2014-12854,035952,994
2015-011294,0892893,176
2015-02614,031423,207
2015-031554,133583,245
2015-043344,3011373,282
2015-055884,6183893,486
2015-068554,9374943,137
2015-079145,1225423,324
2015-086544,8854153,302
2015-095044,6532293,129
2015-103774,7322303,115
2015-112404,896993,019
2015-12894,8991753,099
2016-01634,832522,862
2016-025345,305- 2,820
2016-031235,2742132,975
2016-044365,3751833,021
2016-057845,5714743,106
2016-061,4316,1479723,584
2016-077385,9715393,581
2016-081,0235,9215823,748
2016-096885,8893873,906
2016-107415,8582023,878
2016-113665,890373,816
2016-12175,866- 3,641
2017-01586,938423,631
2017-021016,505- 3,631
2017-03746,456973,515
2017-041256,145963,428
2017-053485,7093653,319
2017-065894,8685372,884
2017-074554,5855442,889
2017-082893,8521842,491
2017-093933,5562412,345
2017-104563,2722612,404
2017-113593,265562,423
2017-122893,5381842,607
2018-011793,659702,635
2018-021513,7082142,849
2018-033583,9932873,039
2018-045084,3762173,160
2018-055384,5656343,429
2018-065054,4811,1694,061
2018-076104,6357784,295
2018-085204,8655454,656
2018-097235,1954444,859
2018-104915,2301874,785
2018-112655,1362875,016
2018-12674,9142465,078
2019-011404,8751085,116
2019-021314,855934,995
2019-032424,739674,775
2019-042384,4681954,753
2019-057024,6337974,916
2019-069195,0488014,548
2019-072,0926,5301,2875,054
2019-081,6947,705

 

* In August 2016, the table data for the DETER columns switches from DETER to DETER-B, Brazil's new deforestation detection system.

 

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