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3 Replies and 1489 Views
FLAASH Issue? 1489 3
Started by Deleted User
I am working with some sensor test data and need to atmospherically correct it. When I run QUAC, no problems with the data converting from radiance to reflectance. However, when I run FLAASH (ENVI 5.6.3 and ENVI 5.6.2) I get negative values in the blue to green region of the spectrum. The radiance data is in W/cm-2 - sr - um and I use the conversion/gain factor of 1000 to convert to um/cm-2 - sr - nm for FLAASH. The data is float point data in BIP format. Conditions are MLS profile, urban aeroso...
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1489 |
by MariM 28 Nov 2022 10:12 AM |
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2 Replies and 1342 Views
Statistics Issues 1342 2
Started by Deleted User
I have an image that ran successfully through QUAC and when I try to run a SAM classification I get a 'Zero Array' error message. I'm using ENVI 5.6.2 looking at Planet Scope data. I run a simple band statistics and get the following: Dims: Full Scene (30,223,820 Points) Basic Stats Min Max Mean StdDev Band 1 1 12885 328.570124 270.797651 Band 2 1 11342 333.476376 334.043302 ...
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1342 |
by Deleted User25 Nov 2022 11:40 AM |
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1 Replies and 1343 Views
ENVI Modeler 1343 1
Started by Deleted User
I want to split my ROIs into training and testing, but I want to do it multiple times and get multiple results for the classification, so I created an array where the value is the SplitFraction for the SplitExamples Task and connected it to an iteration task then on to the SplitExamples Task. In ENVI Modeler I import my raster and ROIs, use ExtractExamplesFromRaster then ShuffleExamples after that, I connect it to SplitExamples. I don't understand how to select only the testing ROIs from the out...
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1343 |
by Deleted User23 Nov 2022 08:13 AM |
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2 Replies and 1431 Views
Using NIST spectral data in ENVI 1431 2
Started by Deleted User
Hello ENVI community, I'm new to this so sorry for the noob questions. I'm trying to detect atmospheric methane in hyperspectral satellite data, specifically PRISMA and EnMAP, so the process should be similar to using AVIRIS-ng. The L3Harris tutorials have good guidance on how to perform spectral profile processing for ground features, but my target is atmospheric methane and I have a few questions that I hope the community can help me with. Firstly, as my target spectrum is in the atmosp...
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1431 |
by Deleted User22 Nov 2022 12:24 AM |
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1 Replies and 1371 Views
No Data values being are used in MNF 1371 1
Started by Deleted User
I have set the No Data value in the envi header file but these no data values are being used in the MNF. I know the no data setting is effective because it has removed the black area that was previously around the image. This black area that was removed by the no data tag reappears after running forward 'mnf estimate noise statistics', implying this no data area is being used in the MNF stats How do I stop this from happening Thanks
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1371 |
by MariM01 Oct 2022 06:33 AM |
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1 Replies and 1535 Views
SAM un ENVI Modeler 1535 1
Started by Deleted User
Hello! I try to run a Spectral Angle Mapper Classification in ENVI Modeler, but the input I want to search is a spectra on an Spectral Library (just one spectra) nad need the Rule file. The tool ask me for MEAN, that is Number of Bands and classes... but I cannot understand, I bput all image bandas and one class : &91;322,1&93; ... the I try with two spectra and choos &91;322,2&93; I have different warnings error in both. Also when you have a ROI you can export ir to CSV, this is not po...
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1535 |
by MariM24 Aug 2022 08:57 AM |
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0 Replies and 2184 Views
IDL API for Spectral Smoothing 2184 0
Started by Deleted User
Is there a way to programmatically perform THOR Spectral Smoothing in an IDL script I could not find an API for that function. While the THOR spectral smoothing is based on the Savitsky-Golay Filter (SAVGOL in IDL), I can't manage to CONVOL it to a raster (CONVOL only accepts arrays as input, and I need to apply it to an hyperspectral image). Thanks!
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2184 |
24 Aug 2022 05:02 AM |
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2 Replies and 1353 Views
SEGMENTATION IMAGE COMMAND LINE 1353 2
Started by Deleted User
Hi, I would like to use the ENVI tool 'segmentation image' in command line in IDL. Is it possible Or, how can I do to obtain similar results with IDL Thank you in advance, A.
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1353 |
by Deleted User15 Aug 2022 06:32 AM |
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0 Replies and 1860 Views
SEGMENTATION IMAGE COMMAND LINE 1860 0
Started by Deleted User
Hi, I would like to use the ENVI tool 'segmentation image' in command line in IDL. Is it possible Or, how can I do to obtain similar results with IDL Thank you in advance, A.
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1860 |
15 Aug 2022 05:38 AM |
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1 Replies and 1336 Views
ENVI ROI statistics 1336 1
Started by Deleted User
I'm trying to gather information from ROI in an image that I am looking at and when I compute statistics, the DN values are binned. Is there a way to get the exact values of each pixel instead of binning the values together
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1336 |
by MariM12 Aug 2022 08:50 AM |
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0 Replies and 1767 Views
Linear Unmixing Issue 1767 0
Started by Deleted User
I'm trying to unmix the spectra in a single, 30m pixel. The input raster has 349 bands and the input spectral file that I'm using as the endmember file has 349 bands and 200 spectra. I keep getting that the number of endmembers should match the raster input file. They match, so I'm confused on the issue here unless the pixel only contains one endmember.
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1767 |
27 Jul 2022 11:06 AM |
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2 Replies and 1622 Views
Spectral Analyst Issue in ENVI 5.6.2 1622 2
Started by Deleted User
I am trying to an analysis using Spectral Analyst and when I select my spectral library and hit apply instead of getting a set of spectra to select to use in the analysis, my selection is 'Histogram' and no spectral is available to select. Is this a data issue or an ENVI 5.6.2 issue Thanks.
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1622 |
by Deleted User27 Jul 2022 11:00 AM |
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2 Replies and 2037 Views
Noise spike/bad pixel removal 2037 2
Started by Deleted User
This should be a pretty basic one: I have a small number of hyperspectral image cubes where there are occasional artifacts in individual spatial pixels. These usually come in the form of one or several spectral bands that have obviously erroneous values (e.g. large noise spikes) and are usually easy to spot when manually inspecting the cubes using the z profile tool. However, the affected spectral bands are not identical across a scene, so I cannot simply simply remove or flag the bands across t...
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2037 |
by Deleted User22 Jun 2022 04:00 PM |
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0 Replies and 1863 Views
ENVI Modeler Question 1863 0
Started by Deleted User
I have to process a bunch of files and keep doing the same tasks with each file. So, I thought..write a program in ENVI Modeler to do the rescale, remove bad bands, and atmospheric correction. Well, easier said than done. How do I do the band math option where I apply the same scale factor to each of the 421 spectral bands I know how to do it manually, but it seems that the band math module in ENVI modeler does not give me the option to apply the band math expression to all spectral bands. Is t...
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1863 |
22 Jun 2022 01:07 PM |
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5 Replies and 1820 Views
Unit conversion 1820 5
Started by Deleted User
What is the recommended way to apply the conversion factor (10^-3) to convert J/cm^2 sr um or W*s/cm^2 sr um to uW/cm^2 sr nm Would I do this is ENVI Classic Basic Tools or in the ENVI GUI Raster Tools or Radiometric correction tools
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1820 |
by Deleted User15 Jun 2022 07:17 AM |
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1 Replies and 1388 Views
ENVI Classic vs. ENVI GUI gains/bias values metadata/header file discrepancy 1388 1
Started by Deleted User
I have some *.img data that was generated using DIRSIG. This is odd. When I review the data in ENVI Classic I see that each wavelength has a gain and offset values associated with it. When I review the same data in the ENVI 5.6.2 GUI and look at Spectral the gains and offset values are missing. What is the difference here between the two forms of ENVI
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1388 |
by MariM15 Jun 2022 06:32 AM |
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1 Replies and 2167 Views
Removing bad bands 2167 1
Started by Deleted User
I removed bad bands from HySpex Hyperspectral image in ENVI. There a flat line instead of gap in the interval of removed bands. Please help. I want the removed bands to show as gaps and not a flat line. Thank you
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2167 |
by MariM07 Jun 2022 10:14 AM |
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0 Replies and 2035 Views
NDVI error 2035 0
Started by Deleted User
Using the NDVI algorithm in the toolbox I get an error window: Variable is undefined: . I use a Sentinel-2 (JPEG2000) img with the 4 bands Red (665.0) Green (559.0) Blue (492.3) and NIR (833.0). Data type: Uint Why am I getting this message that does not allow me to calculate NDVI Thanks
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2035 |
22 Apr 2022 07:14 AM |
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1 Replies and 1418 Views
annotations not working 1418 1
Started by Deleted User
I'm making some figures and want to export a color bar with my image. I have loaded a greyscale layer and changed the color scheme. When I click on the annotations button the menu is not showing up. This just started today (April 11, 2022). Last week I was able to use the same image for a figure and the annotations worked normally.
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1418 |
by MariM14 Apr 2022 10:24 AM |
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0 Replies and 1937 Views
Annotations not working ENVI 5.6 1937 0
Started by Deleted User
The annotations button is not working in the ENVI 5.6 version that I am currently using. This is a recent options failure. It was working in late March, 2022. Any suggestions I am making figures and need a color bar. Thanks!
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1937 |
12 Apr 2022 08:45 AM |