Needing more explanation? [on hold]Other ideas on flaash?Explaining ENVI equations?

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Needing more explanation? [on hold]


Other ideas on flaash?Explaining ENVI equations?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








-4















Why do we use this comparison with the numbers 0; 10000 and ... I do not understand these values.



What are they for?



In this equation (b1 the 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 and b1 lt 10000) * float (b1) / 10000 b1.



Is the value 10000 why is it used here?



Similarly for 0 and 1. Why do we compare them with band 1?



This has nothing to do with my previous question, whose answers have been given in half.










share|improve this question









New contributor




alexandra is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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put on hold as unclear what you're asking by J.R, Erik, Vince, Andre Silva, Spacedman Apr 2 at 13:28


Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.













  • 1





    Possible duplicate of Explaining ENVI equations

    – Erik
    Apr 2 at 12:11






  • 1





    Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

    – Vince
    Apr 2 at 12:23











  • Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

    – smiller
    Apr 2 at 14:20












  • Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

    – smiller
    Apr 2 at 14:35











  • As per the Tour there should be only one question asked per question.

    – PolyGeo
    Apr 2 at 20:59

















-4















Why do we use this comparison with the numbers 0; 10000 and ... I do not understand these values.



What are they for?



In this equation (b1 the 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 and b1 lt 10000) * float (b1) / 10000 b1.



Is the value 10000 why is it used here?



Similarly for 0 and 1. Why do we compare them with band 1?



This has nothing to do with my previous question, whose answers have been given in half.










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.











put on hold as unclear what you're asking by J.R, Erik, Vince, Andre Silva, Spacedman Apr 2 at 13:28


Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.













  • 1





    Possible duplicate of Explaining ENVI equations

    – Erik
    Apr 2 at 12:11






  • 1





    Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

    – Vince
    Apr 2 at 12:23











  • Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

    – smiller
    Apr 2 at 14:20












  • Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

    – smiller
    Apr 2 at 14:35











  • As per the Tour there should be only one question asked per question.

    – PolyGeo
    Apr 2 at 20:59













-4












-4








-4








Why do we use this comparison with the numbers 0; 10000 and ... I do not understand these values.



What are they for?



In this equation (b1 the 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 and b1 lt 10000) * float (b1) / 10000 b1.



Is the value 10000 why is it used here?



Similarly for 0 and 1. Why do we compare them with band 1?



This has nothing to do with my previous question, whose answers have been given in half.










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.












Why do we use this comparison with the numbers 0; 10000 and ... I do not understand these values.



What are they for?



In this equation (b1 the 0) * 0 + (b1 ge 10000) * 1 + (b1 gt 0 and b1 lt 10000) * float (b1) / 10000 b1.



Is the value 10000 why is it used here?



Similarly for 0 and 1. Why do we compare them with band 1?



This has nothing to do with my previous question, whose answers have been given in half.







flaash






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 20:58









PolyGeo

53.9k1781245




53.9k1781245






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.









asked Apr 2 at 11:47









alexandraalexandra

11




11




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.





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.






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




put on hold as unclear what you're asking by J.R, Erik, Vince, Andre Silva, Spacedman Apr 2 at 13:28


Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.









put on hold as unclear what you're asking by J.R, Erik, Vince, Andre Silva, Spacedman Apr 2 at 13:28


Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.









  • 1





    Possible duplicate of Explaining ENVI equations

    – Erik
    Apr 2 at 12:11






  • 1





    Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

    – Vince
    Apr 2 at 12:23











  • Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

    – smiller
    Apr 2 at 14:20












  • Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

    – smiller
    Apr 2 at 14:35











  • As per the Tour there should be only one question asked per question.

    – PolyGeo
    Apr 2 at 20:59












  • 1





    Possible duplicate of Explaining ENVI equations

    – Erik
    Apr 2 at 12:11






  • 1





    Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

    – Vince
    Apr 2 at 12:23











  • Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

    – smiller
    Apr 2 at 14:20












  • Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

    – smiller
    Apr 2 at 14:35











  • As per the Tour there should be only one question asked per question.

    – PolyGeo
    Apr 2 at 20:59







1




1





Possible duplicate of Explaining ENVI equations

– Erik
Apr 2 at 12:11





Possible duplicate of Explaining ENVI equations

– Erik
Apr 2 at 12:11




1




1





Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

– Vince
Apr 2 at 12:23





Welcome to GIS SE. As a new user, please take the Tour. Unfortunately, GIS SE is an English language forum. Please make use of translation software to post questions (you can leave the original French for reference). Please qualify how this is different from your previous point and include a link to the reference from which you are working.

– Vince
Apr 2 at 12:23













Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

– smiller
Apr 2 at 14:20






Possible reference (takes a while to load): apfnet.cn/en/uploads/file/20171113/1510562479730765.pdf. The equation in this document is given as part of a section called "Post FLAASH equation" and states "For the positive Digital number’s value use following equation (B1 le 0)*0+(B1 ge 10000)*1+(B1 gt 0 and B1 lt 10000)*float (b1)/10000"

– smiller
Apr 2 at 14:20














Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

– smiller
Apr 2 at 14:35





Per a comment on researchgate.net/post/…, this band math is used to eliminate negative values. That's as far as I can get without more information. Please include your reference.

– smiller
Apr 2 at 14:35













As per the Tour there should be only one question asked per question.

– PolyGeo
Apr 2 at 20:59





As per the Tour there should be only one question asked per question.

– PolyGeo
Apr 2 at 20:59










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