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0 Replies and 2 Views
Bug in Image Registration Workflow 2 0
Started by Federico Carotenuto
I am running the image co-registration workflow in ENVI 5.6.2, but it keeps asking to overwrite the tie-points file, restarting the co-registration and so on and so forth. I have two file: BaseFile.dat (with corresponding BaseFile.hdr), WarpFile.dat (with corresponding WarpFile.hdr). I try to co-register them with the image co-registration workflow, I reach the window where it runs the co-registration, the progress bar finishes, then instead of completing the procedure ENVI keeps asking if I...
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31 Jan 2023 02:56 AM |
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3 Replies and 591 Views
DEM extraction 591 3
Started by Drew
Hi,
I have worldview stereo imagery that i plan to use to extract a DEM. However, the imagery lies across two swaths and has two seperate pairs of RPC files. Although i can mosiac the imagery, the DEM extraction wizard only gives you the option to select one RPC file. After some googling i notice that Geomatica OrthoEngine has an option to stitch imagery together and combine the relative RCP files. Is this possible in ENVI
Thanks in advance of any advice.
Andy
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591 |
by J. Miguel Quintana 27 Jan 2023 01:12 PM |
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1 Replies and 24 Views
Subset Data from ROis in ENVI 5.6.2 24 1
Started by Josiane Lavoie-Bélanger
We purchased a copy of ENVI 5.6.2 last year in October. Our motive is to work with a novel ocean-centric Hyperspectral data, named WISE in ENVI. We are looking to extract reflectance value from specific ROis for hyperspectral data (from an experimental sensor, so not registered on any software). I have field station data I wanna compare to our hyperspectral imagery reflectance value. We found ENVI very useful to read/write the large hyperspectral tiles and see the variation in spectral reflectan...
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by MariM25 Jan 2023 11:00 AM |
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1 Replies and 80 Views
ASCII file with wavelengths and FWHM 80 1
Started by Glen Shennan
Hi, I'm using the FLAASH tool on some pre-processed data in which the band information has been lost. The tool is asking for the 'ASCII Filename containing wavelengths and fwhm'. I have the band details but I need to know what format the ASCII file is in. As in: what are the column and row names, what units should each value be in. Thanks
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by MariM27 Dec 2022 08:21 AM |
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3 Replies and 992 Views
EO1-ALi data 992 3
Started by charlie
How do I import EO1-Ali L1GST images into ENVI..Also for atmospheric correction, when asked for the sensor type; ALI sensor is not in the list...so how do i proceed with it.
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by MariM29 Nov 2022 06:05 AM |
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3 Replies and 109 Views
FLAASH Issue? 109 3
Started by Karen Kowalewsky
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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by MariM28 Nov 2022 10:12 AM |
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2 Replies and 165 Views
Statistics Issues 165 2
Started by Karen Kowalewsky
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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by Karen Kowalewsky25 Nov 2022 11:40 AM |
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1 Replies and 147 Views
ENVI Modeler 147 1
Started by Manaf Alkhuzaei
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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by Manaf Alkhuzaei23 Nov 2022 08:13 AM |
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2 Replies and 118 Views
Using NIST spectral data in ENVI 118 2
Started by Filip Topheri
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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by Filip Topheri22 Nov 2022 12:24 AM |
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1 Replies and 202 Views
No Data values being are used in MNF 202 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 MariM01 Oct 2022 06:33 AM |
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1 Replies and 335 Views
SAM un ENVI Modeler 335 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 MariM24 Aug 2022 08:57 AM |
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0 Replies and 257 Views
IDL API for Spectral Smoothing 257 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 |
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2 Replies and 233 Views
SEGMENTATION IMAGE COMMAND LINE 233 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 288 Views
SEGMENTATION IMAGE COMMAND LINE 288 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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288 |
15 Aug 2022 05:38 AM |
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1 Replies and 207 Views
ENVI ROI statistics 207 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 MariM12 Aug 2022 08:50 AM |
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0 Replies and 300 Views
Linear Unmixing Issue 300 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 |
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2 Replies and 309 Views
Spectral Analyst Issue in ENVI 5.6.2 309 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 399 Views
Noise spike/bad pixel removal 399 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 320 Views
ENVI Modeler Question 320 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 345 Views
Unit conversion 345 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 |