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Explaining ENVI equations?


Needing more explanation?ENVI Vegetation Index CalculatorWhat is meaning of Emissive in ENVI?Loading ENVI file into ArcGIS Desktop?Asking linear regression between NDVI and LST using ENVIatmospheric correction in ENVI 5.1Parameter names and meaning of their values in an ENVI header fileOpen Sentinel-1 products using ENVI 5.3How to spatial subset (clip) TerraSAR-X SSC data (.cos) using vector files and one of the softwares (ENVI, PCI Geomatica, Erdas Imagine, etc)?ENVI band math incorrect valuesOther ideas on flaash?






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0















Could you please explain the meaning of this equation:



(b1 le 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 et b1 lt 10000) * float (b1) / 10000 b1.


What do ge, gl etc mean?










share|improve this question









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    0















    Could you please explain the meaning of this equation:



    (b1 le 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 et b1 lt 10000) * float (b1) / 10000 b1.


    What do ge, gl etc mean?










    share|improve this question









    New contributor




    alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      0












      0








      0








      Could you please explain the meaning of this equation:



      (b1 le 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 et b1 lt 10000) * float (b1) / 10000 b1.


      What do ge, gl etc mean?










      share|improve this question









      New contributor




      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      Could you please explain the meaning of this equation:



      (b1 le 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 et b1 lt 10000) * float (b1) / 10000 b1.


      What do ge, gl etc mean?







      envi






      share|improve this question









      New contributor




      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited Apr 2 at 20:56









      PolyGeo

      53.9k1781245




      53.9k1781245






      New contributor




      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      asked Apr 2 at 10:29









      alexandraalexandra

      11




      11




      New contributor




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      New contributor





      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          2 Answers
          2






          active

          oldest

          votes


















          3















          • ge means "greater or equal" (i.e. >=)


          • gt means "greater than" (i.e. strictly greater, >)


          • le means "lower or equal" (i.e. <=)


          • lt means "lower than" (i.e. strictly lower, <)

          et is probably a mistake (French for and).






          share|improve this answer
































            1














            These are relational Operators. See here: https://www.harrisgeospatial.com/docs/Relational_Operators.html



            I'm not sure what et stands for, but using these, the equation becomes:



            (b1 <= 0) * 0 + (b1 >= 10000) * 1 + (b1 > 0 et b1 < 10000) * float (b1) / 10000 b1.






            share|improve this answer























              Your Answer








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              2 Answers
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              active

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              2 Answers
              2






              active

              oldest

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              active

              oldest

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              active

              oldest

              votes









              3















              • ge means "greater or equal" (i.e. >=)


              • gt means "greater than" (i.e. strictly greater, >)


              • le means "lower or equal" (i.e. <=)


              • lt means "lower than" (i.e. strictly lower, <)

              et is probably a mistake (French for and).






              share|improve this answer





























                3















                • ge means "greater or equal" (i.e. >=)


                • gt means "greater than" (i.e. strictly greater, >)


                • le means "lower or equal" (i.e. <=)


                • lt means "lower than" (i.e. strictly lower, <)

                et is probably a mistake (French for and).






                share|improve this answer



























                  3












                  3








                  3








                  • ge means "greater or equal" (i.e. >=)


                  • gt means "greater than" (i.e. strictly greater, >)


                  • le means "lower or equal" (i.e. <=)


                  • lt means "lower than" (i.e. strictly lower, <)

                  et is probably a mistake (French for and).






                  share|improve this answer
















                  • ge means "greater or equal" (i.e. >=)


                  • gt means "greater than" (i.e. strictly greater, >)


                  • le means "lower or equal" (i.e. <=)


                  • lt means "lower than" (i.e. strictly lower, <)

                  et is probably a mistake (French for and).







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited Apr 2 at 12:01

























                  answered Apr 2 at 10:46









                  ArMoraerArMoraer

                  4,69121640




                  4,69121640























                      1














                      These are relational Operators. See here: https://www.harrisgeospatial.com/docs/Relational_Operators.html



                      I'm not sure what et stands for, but using these, the equation becomes:



                      (b1 <= 0) * 0 + (b1 >= 10000) * 1 + (b1 > 0 et b1 < 10000) * float (b1) / 10000 b1.






                      share|improve this answer



























                        1














                        These are relational Operators. See here: https://www.harrisgeospatial.com/docs/Relational_Operators.html



                        I'm not sure what et stands for, but using these, the equation becomes:



                        (b1 <= 0) * 0 + (b1 >= 10000) * 1 + (b1 > 0 et b1 < 10000) * float (b1) / 10000 b1.






                        share|improve this answer

























                          1












                          1








                          1







                          These are relational Operators. See here: https://www.harrisgeospatial.com/docs/Relational_Operators.html



                          I'm not sure what et stands for, but using these, the equation becomes:



                          (b1 <= 0) * 0 + (b1 >= 10000) * 1 + (b1 > 0 et b1 < 10000) * float (b1) / 10000 b1.






                          share|improve this answer













                          These are relational Operators. See here: https://www.harrisgeospatial.com/docs/Relational_Operators.html



                          I'm not sure what et stands for, but using these, the equation becomes:



                          (b1 <= 0) * 0 + (b1 >= 10000) * 1 + (b1 > 0 et b1 < 10000) * float (b1) / 10000 b1.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Apr 2 at 10:50









                          Devdatta TengsheDevdatta Tengshe

                          31.1k21109214




                          31.1k21109214




















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