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3 Replies and 1154 Views FLAASH Issue?  1154  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...
3 1154
by  MariMJump to last post
28 Nov 2022 10:12 AM
2 Replies and 1043 Views Statistics Issues  1043  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 ...
2 1043
by  Deleted UserJump to last post
25 Nov 2022 11:40 AM
1 Replies and 1048 Views ENVI Modeler  1048  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...
1 1048
by  Deleted UserJump to last post
23 Nov 2022 08:13 AM
2 Replies and 1087 Views Using NIST spectral data in ENVI  1087  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...
2 1087
by  Deleted UserJump to last post
22 Nov 2022 12:24 AM
1 Replies and 1064 Views No Data values being are used in MNF  1064  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
1 1064
by  MariMJump to last post
01 Oct 2022 06:33 AM
1 Replies and 1205 Views SAM un ENVI Modeler  1205  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...
1 1205
by  MariMJump to last post
24 Aug 2022 08:57 AM
0 Replies and 1825 Views IDL API for Spectral Smoothing  1825  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!
0 1825
24 Aug 2022 05:02 AM
2 Replies and 1091 Views SEGMENTATION IMAGE COMMAND LINE  1091  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.
2 1091
by  Deleted UserJump to last post
15 Aug 2022 06:32 AM
0 Replies and 1525 Views SEGMENTATION IMAGE COMMAND LINE  1525  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.
0 1525
15 Aug 2022 05:38 AM
1 Replies and 1044 Views ENVI ROI statistics  1044  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
1 1044
by  MariMJump to last post
12 Aug 2022 08:50 AM
0 Replies and 1474 Views Linear Unmixing Issue  1474  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.
0 1474
27 Jul 2022 11:06 AM
2 Replies and 1317 Views Spectral Analyst Issue in ENVI 5.6.2  1317  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.
2 1317
by  Deleted UserJump to last post
27 Jul 2022 11:00 AM
2 Replies and 1651 Views Noise spike/bad pixel removal  1651  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...
2 1651
by  Deleted UserJump to last post
22 Jun 2022 04:00 PM
0 Replies and 1514 Views ENVI Modeler Question  1514  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...
0 1514
22 Jun 2022 01:07 PM
5 Replies and 1416 Views Unit conversion  1416  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
5 1416
by  Deleted UserJump to last post
15 Jun 2022 07:17 AM
1 Replies and 1103 Views ENVI Classic vs. ENVI GUI gains/bias values metadata/header file discrepancy  1103  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
1 1103
by  MariMJump to last post
15 Jun 2022 06:32 AM
1 Replies and 1793 Views Removing bad bands  1793  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
1 1793
by  MariMJump to last post
07 Jun 2022 10:14 AM
0 Replies and 1704 Views NDVI error  1704  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
0 1704
22 Apr 2022 07:14 AM
1 Replies and 1145 Views annotations not working  1145  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.
1 1145
by  MariMJump to last post
14 Apr 2022 10:24 AM
0 Replies and 1650 Views Annotations not working ENVI 5.6  1650  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!
0 1650
12 Apr 2022 08:45 AM
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