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Hansen Global Forest Change - Forest Loss Year - Dates Clarification


Change Detection ArcGIS with multiple datesMethodology for Hansen classification of Global Forest Watch?Automated Forest Change Detection“First” and “Last” from Global Forest ChangeHow to compute Tree Cover Loss by year in QGIS?Extracting value from global forest coverAddition and subtraction of rasterbrick objects in R













0















I have scoured both the GFC website, research papers and Stack Exchange, but haven't been able to find a clear and reliable explanation of what the "Year of gross forest cover loss event" pixel values represent.



Using V1.6 as an example, if I download the "lossyear" dataset, I see values in the range of 0-18:
Assuming 0 equals no loss, does 18 equal a loss event between 1st January 2018 and 31st December 2018? Or does 18 equal a loss event between 1st January 2017 and 1st January 2018?



People I have spoken to regarding this have assumed that pixel value 18 equals a loss within the year of 2018, so 1st Jan 2018 to 31st Dec 2018. But looking at a chart from the paper has confused me.



enter image description here



According to this, I would expect loss between 2000 and 2001 to be value 1, so therefore in my dataset a pixel value of 18 would represent loss that occurred between 2017 and 2018.



Can anyone clarify this for me?










share|improve this question




























    0















    I have scoured both the GFC website, research papers and Stack Exchange, but haven't been able to find a clear and reliable explanation of what the "Year of gross forest cover loss event" pixel values represent.



    Using V1.6 as an example, if I download the "lossyear" dataset, I see values in the range of 0-18:
    Assuming 0 equals no loss, does 18 equal a loss event between 1st January 2018 and 31st December 2018? Or does 18 equal a loss event between 1st January 2017 and 1st January 2018?



    People I have spoken to regarding this have assumed that pixel value 18 equals a loss within the year of 2018, so 1st Jan 2018 to 31st Dec 2018. But looking at a chart from the paper has confused me.



    enter image description here



    According to this, I would expect loss between 2000 and 2001 to be value 1, so therefore in my dataset a pixel value of 18 would represent loss that occurred between 2017 and 2018.



    Can anyone clarify this for me?










    share|improve this question


























      0












      0








      0








      I have scoured both the GFC website, research papers and Stack Exchange, but haven't been able to find a clear and reliable explanation of what the "Year of gross forest cover loss event" pixel values represent.



      Using V1.6 as an example, if I download the "lossyear" dataset, I see values in the range of 0-18:
      Assuming 0 equals no loss, does 18 equal a loss event between 1st January 2018 and 31st December 2018? Or does 18 equal a loss event between 1st January 2017 and 1st January 2018?



      People I have spoken to regarding this have assumed that pixel value 18 equals a loss within the year of 2018, so 1st Jan 2018 to 31st Dec 2018. But looking at a chart from the paper has confused me.



      enter image description here



      According to this, I would expect loss between 2000 and 2001 to be value 1, so therefore in my dataset a pixel value of 18 would represent loss that occurred between 2017 and 2018.



      Can anyone clarify this for me?










      share|improve this question
















      I have scoured both the GFC website, research papers and Stack Exchange, but haven't been able to find a clear and reliable explanation of what the "Year of gross forest cover loss event" pixel values represent.



      Using V1.6 as an example, if I download the "lossyear" dataset, I see values in the range of 0-18:
      Assuming 0 equals no loss, does 18 equal a loss event between 1st January 2018 and 31st December 2018? Or does 18 equal a loss event between 1st January 2017 and 1st January 2018?



      People I have spoken to regarding this have assumed that pixel value 18 equals a loss within the year of 2018, so 1st Jan 2018 to 31st Dec 2018. But looking at a chart from the paper has confused me.



      enter image description here



      According to this, I would expect loss between 2000 and 2001 to be value 1, so therefore in my dataset a pixel value of 18 would represent loss that occurred between 2017 and 2018.



      Can anyone clarify this for me?







      raster remote-sensing






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 14 hours ago









      PolyGeo

      53.8k1781244




      53.8k1781244










      asked 14 hours ago









      LewisLewis

      407




      407




















          2 Answers
          2






          active

          oldest

          votes


















          1















          Assuming 0 equals no loss, does 18 equal a loss event between 1st
          January 2018 and 31st December 2018?




          My understanding is that this is correct. Those values from 0-18 indicate the year in which the loss occurred.



          I think the tricky concept here is that the "loss" occurs when looking at the difference between two different years of data. So that 2018 might be the first year in which the "loss" occurs, i.e. an area that was previously forested is no longer so.



          The chart seems to indicate this as well, so that the column entitled "00-01" is looking at the difference between years 2000 and 2001, and counting pixels which were forested in 2000 but no longer forested in 2001.



          You could verify by looking at the individual year layers and noting where & what time the forest loss occurs, and if that does correspond to the loss year that they're indicating.






          share|improve this answer






























            0














            Matt Hansen kindly responded to an email and clarified that it is indeed as Mike N detailed. The pixel value refers to the calendar year that loss was observed. Therefore 18 equals a loss event between 1st January 2018 and 31st December 2018.




            Year of gross forest cover loss event (lossyear) Forest loss during
            the period 2000–2018, defined as a stand-replacement disturbance, or a
            change from a forest to non-forest state. Encoded as either 0 (no
            loss) or else a value in the range 1–17, representing loss detected
            primarily in the year 2001–2018, respectively. So, 1 = 2001 calendar
            year, and so on.
            Note 'primarily' as our detection of loss can be
            delayed and we misallocate a portion of the disturbance events.







            share|improve this answer






















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              2 Answers
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              2 Answers
              2






              active

              oldest

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              active

              oldest

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              active

              oldest

              votes









              1















              Assuming 0 equals no loss, does 18 equal a loss event between 1st
              January 2018 and 31st December 2018?




              My understanding is that this is correct. Those values from 0-18 indicate the year in which the loss occurred.



              I think the tricky concept here is that the "loss" occurs when looking at the difference between two different years of data. So that 2018 might be the first year in which the "loss" occurs, i.e. an area that was previously forested is no longer so.



              The chart seems to indicate this as well, so that the column entitled "00-01" is looking at the difference between years 2000 and 2001, and counting pixels which were forested in 2000 but no longer forested in 2001.



              You could verify by looking at the individual year layers and noting where & what time the forest loss occurs, and if that does correspond to the loss year that they're indicating.






              share|improve this answer



























                1















                Assuming 0 equals no loss, does 18 equal a loss event between 1st
                January 2018 and 31st December 2018?




                My understanding is that this is correct. Those values from 0-18 indicate the year in which the loss occurred.



                I think the tricky concept here is that the "loss" occurs when looking at the difference between two different years of data. So that 2018 might be the first year in which the "loss" occurs, i.e. an area that was previously forested is no longer so.



                The chart seems to indicate this as well, so that the column entitled "00-01" is looking at the difference between years 2000 and 2001, and counting pixels which were forested in 2000 but no longer forested in 2001.



                You could verify by looking at the individual year layers and noting where & what time the forest loss occurs, and if that does correspond to the loss year that they're indicating.






                share|improve this answer

























                  1












                  1








                  1








                  Assuming 0 equals no loss, does 18 equal a loss event between 1st
                  January 2018 and 31st December 2018?




                  My understanding is that this is correct. Those values from 0-18 indicate the year in which the loss occurred.



                  I think the tricky concept here is that the "loss" occurs when looking at the difference between two different years of data. So that 2018 might be the first year in which the "loss" occurs, i.e. an area that was previously forested is no longer so.



                  The chart seems to indicate this as well, so that the column entitled "00-01" is looking at the difference between years 2000 and 2001, and counting pixels which were forested in 2000 but no longer forested in 2001.



                  You could verify by looking at the individual year layers and noting where & what time the forest loss occurs, and if that does correspond to the loss year that they're indicating.






                  share|improve this answer














                  Assuming 0 equals no loss, does 18 equal a loss event between 1st
                  January 2018 and 31st December 2018?




                  My understanding is that this is correct. Those values from 0-18 indicate the year in which the loss occurred.



                  I think the tricky concept here is that the "loss" occurs when looking at the difference between two different years of data. So that 2018 might be the first year in which the "loss" occurs, i.e. an area that was previously forested is no longer so.



                  The chart seems to indicate this as well, so that the column entitled "00-01" is looking at the difference between years 2000 and 2001, and counting pixels which were forested in 2000 but no longer forested in 2001.



                  You could verify by looking at the individual year layers and noting where & what time the forest loss occurs, and if that does correspond to the loss year that they're indicating.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 13 hours ago









                  Mike NMike N

                  363




                  363























                      0














                      Matt Hansen kindly responded to an email and clarified that it is indeed as Mike N detailed. The pixel value refers to the calendar year that loss was observed. Therefore 18 equals a loss event between 1st January 2018 and 31st December 2018.




                      Year of gross forest cover loss event (lossyear) Forest loss during
                      the period 2000–2018, defined as a stand-replacement disturbance, or a
                      change from a forest to non-forest state. Encoded as either 0 (no
                      loss) or else a value in the range 1–17, representing loss detected
                      primarily in the year 2001–2018, respectively. So, 1 = 2001 calendar
                      year, and so on.
                      Note 'primarily' as our detection of loss can be
                      delayed and we misallocate a portion of the disturbance events.







                      share|improve this answer



























                        0














                        Matt Hansen kindly responded to an email and clarified that it is indeed as Mike N detailed. The pixel value refers to the calendar year that loss was observed. Therefore 18 equals a loss event between 1st January 2018 and 31st December 2018.




                        Year of gross forest cover loss event (lossyear) Forest loss during
                        the period 2000–2018, defined as a stand-replacement disturbance, or a
                        change from a forest to non-forest state. Encoded as either 0 (no
                        loss) or else a value in the range 1–17, representing loss detected
                        primarily in the year 2001–2018, respectively. So, 1 = 2001 calendar
                        year, and so on.
                        Note 'primarily' as our detection of loss can be
                        delayed and we misallocate a portion of the disturbance events.







                        share|improve this answer

























                          0












                          0








                          0







                          Matt Hansen kindly responded to an email and clarified that it is indeed as Mike N detailed. The pixel value refers to the calendar year that loss was observed. Therefore 18 equals a loss event between 1st January 2018 and 31st December 2018.




                          Year of gross forest cover loss event (lossyear) Forest loss during
                          the period 2000–2018, defined as a stand-replacement disturbance, or a
                          change from a forest to non-forest state. Encoded as either 0 (no
                          loss) or else a value in the range 1–17, representing loss detected
                          primarily in the year 2001–2018, respectively. So, 1 = 2001 calendar
                          year, and so on.
                          Note 'primarily' as our detection of loss can be
                          delayed and we misallocate a portion of the disturbance events.







                          share|improve this answer













                          Matt Hansen kindly responded to an email and clarified that it is indeed as Mike N detailed. The pixel value refers to the calendar year that loss was observed. Therefore 18 equals a loss event between 1st January 2018 and 31st December 2018.




                          Year of gross forest cover loss event (lossyear) Forest loss during
                          the period 2000–2018, defined as a stand-replacement disturbance, or a
                          change from a forest to non-forest state. Encoded as either 0 (no
                          loss) or else a value in the range 1–17, representing loss detected
                          primarily in the year 2001–2018, respectively. So, 1 = 2001 calendar
                          year, and so on.
                          Note 'primarily' as our detection of loss can be
                          delayed and we misallocate a portion of the disturbance events.








                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 10 hours ago









                          LewisLewis

                          407




                          407



























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