Timeline for ENVI band math incorrect values
Current License: CC BY-SA 3.0
31 events
| when toggle format | what | by | license | comment | |
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| Aug 26 at 8:00 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 27 at 20:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| Dec 13, 2021 at 19:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 11, 2021 at 22:00 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 10, 2021 at 13:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 9, 2020 at 15:04 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 11, 2020 at 14:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 13, 2020 at 14:00 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 14, 2019 at 23:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 14, 2019 at 9:00 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jul 15, 2019 at 8:13 | answer | added | Mikkel Lydholm Rasmussen | timeline score: 0 | |
| Jul 15, 2019 at 8:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Mar 17, 2019 at 7:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Feb 15, 2019 at 4:56 | answer | added | AmirHossein Ahrari | timeline score: 0 | |
| Mar 23, 2018 at 1:09 | history | edited | user5858 | CC BY-SA 3.0 |
Added an edit
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| Mar 22, 2018 at 21:28 | comment | added | user5858 | I'm unsure to send the raw AVIRIS data to ArcMap. When I try to use the NDVI tool in ENVI I crash the program. Anyways, thanks for your help! | |
| Mar 22, 2018 at 21:00 | comment | added | Aaron♦ | Try calculating the index in ArcGIS using the Raster Calculator to see how the results differ. | |
| Mar 22, 2018 at 20:59 | comment | added | user5858 | When I check with the cursor value, the strip at the edge of the band with no actual data has a value of -0. When I import this into ArcMap and set null to <-1.5 the lowest value then becomes -1.4, indicating that -1.163 isn't the null. | |
| Mar 22, 2018 at 20:51 | comment | added | Aaron♦ | What is the NoData value? | |
| Mar 22, 2018 at 20:50 | comment | added | user5858 | I got the same answer. However, when I imported the band into ArcMap I couldn't find pixels <-1, and by using the identify tool all the pixels seem to be in the valid range. Could this just be an artifact of how ENVI band math works? | |
| Mar 22, 2018 at 20:34 | comment | added | Aaron♦ |
Try the following syntax: (float(b1)-float(b2))/(float(b1)+float(b2))
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| Mar 22, 2018 at 20:27 | comment | added | user5858 | I'm using band math. | |
| Mar 22, 2018 at 20:26 | comment | added | Aaron♦ | Which tools are you using to calculate the indices? | |
| Mar 22, 2018 at 20:24 | history | edited | Aaron♦ | CC BY-SA 3.0 |
deleted 2 characters in body; edited tags
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| Mar 22, 2018 at 20:21 | history | asked | user5858 | CC BY-SA 3.0 |