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1 Replies and 13 Views No Data values being are used in MNF  13  1 Started by  Alexander Gunyon 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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by  Mari MinariJump to last post
01 Oct 2022 06:33 AM
1 Replies and 161 Views SAM un ENVI Modeler  161  1 Started by  Jose Manuel Lattus 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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by  Mari MinariJump to last post
24 Aug 2022 08:57 AM
0 Replies and 67 Views IDL API for Spectral Smoothing  67  0 Started by  Federico Carotenuto 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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24 Aug 2022 05:02 AM
2 Replies and 82 Views SEGMENTATION IMAGE COMMAND LINE  82  2 Started by  Anouck ody 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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by  Anouck odyJump to last post
15 Aug 2022 06:32 AM
0 Replies and 80 Views SEGMENTATION IMAGE COMMAND LINE  80  0 Started by  Anouck ody 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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15 Aug 2022 05:38 AM
1 Replies and 81 Views ENVI ROI statistics  81  1 Started by  Jordan L 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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by  Mari MinariJump to last post
12 Aug 2022 08:50 AM
0 Replies and 111 Views Linear Unmixing Issue  111  0 Started by  Karen Kowalewsky 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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27 Jul 2022 11:06 AM
2 Replies and 158 Views Spectral Analyst Issue in ENVI 5.6.2  158  2 Started by  Karen Kowalewsky 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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by  Karen KowalewskyJump to last post
27 Jul 2022 11:00 AM
2 Replies and 245 Views Noise spike/bad pixel removal  245  2 Started by  Tom Nordheim 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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by  Tom NordheimJump to last post
22 Jun 2022 04:00 PM
0 Replies and 149 Views ENVI Modeler Question  149  0 Started by  Karen Kowalewsky 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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22 Jun 2022 01:07 PM
5 Replies and 185 Views Unit conversion  185  5 Started by  Karen Kowalewsky 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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by  Karen KowalewskyJump to last post
15 Jun 2022 07:17 AM
1 Replies and 118 Views ENVI Classic vs. ENVI GUI gains/bias values metadata/header file discrepancy  118  1 Started by  Karen Kowalewsky 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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by  Mari MinariJump to last post
15 Jun 2022 06:32 AM
1 Replies and 165 Views Removing bad bands  165  1 Started by  Daniel Amoakoh 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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by  Mari MinariJump to last post
07 Jun 2022 10:14 AM
0 Replies and 300 Views NDVI error  300  0 Started by  Mattia Barsanti 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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22 Apr 2022 07:14 AM
1 Replies and 193 Views annotations not working  193  1 Started by  Dulci Avouris 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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by  Mari MinariJump to last post
14 Apr 2022 10:24 AM
0 Replies and 296 Views Annotations not working ENVI 5.6  296  0 Started by  Dulci Avouris 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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12 Apr 2022 08:45 AM
4 Replies and 351 Views Landsat Collection 2 Level 1 ENVI 5.6.1  351  4 Started by  Jose Manuel Lattus Hello! I'm trying to open a Landsat 9 Collection 2 level 1 in ENVI 5.6.1 and ENVI do not recognize! I try with the MTL.txt file and the xml file I download from earthexplorer site: LC09_L1TP_233079_20220328_20220328_02_T1 please help me! JM Lattus
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by  Jose Manuel LattusJump to last post
31 Mar 2022 06:40 AM
2 Replies and 699 Views ROI with masked pixels but no existing mask  699  2 Started by  Federico Carotenuto I would like to understand better the 'Mask Count' variables under the ROI Statistics tool. I am working with hyperspectral satellite images to which I didn't personally apply any mask. Nevertheless, when I design some ROI and ask ENVI 5.6 (or IDL 8.8 for what matters) to compute the ROI statistics, those are computed only on a subset of the ROI pixels. For example I have a ROI with 11 pixels of which only 1 is used to compute the statistics (and, therefore, no standard deviation) and 10 ...
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by  Federico CarotenutoJump to last post
25 Feb 2022 10:48 AM
0 Replies and 362 Views AST 09XT Preprocessing Steps  362  0 Started by  Orkun TURGAY Hello forum. I am trying to pre-process 09XT data of ASTER but I think it was different from L1B data processing When I trying to change RPC situation from ENVI header (RPC or RSM) it gives error and wanting to be imported RPC coefficient containing file I am thinking first I have to start orthorectification later then start preprocessing steps but I don't know how to apply orthorectification to the 09XT data do you help me
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30 Jan 2022 08:00 AM
0 Replies and 593 Views Confusion matrix bug  593  0 Started by  Enayat Aria Hi, I have a classification map with three classes. I have also a ground truth dataset provided by ROI tools. The numbers of ground truths (pixels) for classes are 870, 1007, and 695. However, when making the confusion matrix to evaluate the classification, it shows different numbers as the ground truth per class i.e. 598, 887, 695. Just for the third class, it is the same. I do not understand the difference. Why is the total number of pixels of ground truth in the confusion matrix per...
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01 Dec 2021 03:28 AM
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