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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 Minari 01 Oct 2022 06:33 AM |
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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 Minari24 Aug 2022 08:57 AM |
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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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67 |
24 Aug 2022 05:02 AM |
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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 ody15 Aug 2022 06:32 AM |
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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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80 |
15 Aug 2022 05:38 AM |
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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 Minari12 Aug 2022 08:50 AM |
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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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111 |
27 Jul 2022 11:06 AM |
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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 Kowalewsky27 Jul 2022 11:00 AM |
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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 Nordheim22 Jun 2022 04:00 PM |
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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 |
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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 Kowalewsky15 Jun 2022 07:17 AM |
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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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118 |
by Mari Minari15 Jun 2022 06:32 AM |
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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 Minari07 Jun 2022 10:14 AM |
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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 |
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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 Minari14 Apr 2022 10:24 AM |
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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 |
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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 Lattus31 Mar 2022 06:40 AM |
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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 Carotenuto25 Feb 2022 10:48 AM |
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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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362 |
30 Jan 2022 08:00 AM |
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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 |