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0 Replies and 6421 Views
Change Color Table 6421 0
Started by Deleted User
Question: Is there API access to the 'Change Color Table' for grayscale images In the ENVI UI, one can change from using a 'Grayscale' for a single band to some other color table: Select the layer in the view, right click, and then 'Change Color Table'. It is mentioned on the Help page 'Raster Layers'. However, I cannot find any reference to an API for programmatically changing/setting the Color Table. ENVIRasterLayer does not show a color table choice. One can set a 'Quick_Stretch', ...
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6421 |
13 Feb 2024 12:47 PM |
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0 Replies and 3786 Views
Replacing pixel values depending on minimum value band. 3786 0
Started by Deleted User
Need help handling MRDR products from the Mars Reconnaissance Orbiter. The multispectral data has 72 listed channels inside the header, and their corresponding band centers in nanometers. The pixel values represent reflectance. I have created new band stacks around the wavelengths where the absorption bands I'm looking for reside. From these selected bands, a minimum reflectance value has to be found on a pixel basis. I did this with the Compute pixel statistics tool, but it is not suitable f...
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3786 |
30 Jan 2024 09:42 AM |
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2 Replies and 3325 Views
histogram - change the binsize 3325 2
Started by Deleted User
Hi everyone,
when I get the histogram values, I showed the binsize was equal to 17. How can I have a binsize = 1
I looked in "compute statistics" but I couldn't find where to modify that parameter...
Thank you,
Catherine
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3325 |
by Deleted User 10 Oct 2023 09:34 AM |
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8 Replies and 8701 Views
band math - if 8701 8
Started by Deleted User
Using band math is there a way that I could assign all values that equal zero to another value without affecting the other digital numbers.
For example how could I write if b1=0 make equal to 100
Thanks
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8701 |
by Deleted User15 Sep 2023 07:51 AM |
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0 Replies and 3523 Views
ENVI 5 equivalent to User Defined Motion Routine 3523 0
Started by Deleted User
I had written a tool long ago for use with the setting 'ENVI User Defined Motion Routine'. What I am trying to do is something similar, but with the modern ENVI (i.e., ENVI 5 and later), which, as far as I can tell, does not have this setting. I understand that if I write I procedure with an e=envi() call, I can certainly use it for mouse motion events, such as in the help pages for Advanced Concepts -> Event Handler Class. Another 'help' page says: 'In the main program where you run ENV...
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3523 |
15 Sep 2023 07:47 AM |
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1 Replies and 2050 Views
No data areas classified 2050 1
Started by Deleted User
Hi, I use ENVI 5.6.3 for my drone imagery analysis. The background around of my region of interest is set to No Data via edit metadata with the data ignore value set to 0, and thus appears as white (or mabye this is transparent). I am applying thresholds via the decision tree classifer to classify my drone imagery into bare, herbaceous and woody classes. But, the background area also gets classified as bare, which affects the statistics and the confusion matrix calculations. I tried to subset th...
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2050 |
by Deleted User15 Sep 2023 07:16 AM |
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5 Replies and 3199 Views
Re-Scale Landsat Data 3199 5
Started by Deleted User
When I downloaded Landsat data and imported the MTL file to ENVI in the past, I needed to perform Spectral Math to re-scale the data per USGS information. Meaning, if the Landsat metadata's REFLECTANCE_MULT_BAND_1 = 2.75e-05 and REFLECTANCE_ADD_BAND_1 = -0.2, I would enter the expression: 's1*.0000275 - 0.2' and then Map Variable to Input File. Now, when I perform Spectral Math steps on Landsat Collection 2, Level-2 data, the resulting spectra do not look right. When I don't perform Spectr...
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3199 |
by MariM31 Aug 2023 10:28 AM |
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4 Replies and 7742 Views
Error in opening landsat 8 tif 7742 4
Started by Deleted User
Hello,
I use ENVI Version 5.0. I have LANDSAT8 data that I download from the web. Although it worked in the past, I cannot open the files properly:
I use: Open AS - Landsat - geotiff with metadata text file, select the MTL file, and get the error message:
"File does not appear to be a valid tiff file"
Although I use the original TIFF files and it worked in the past.
The problem is with images from the Sixth of June 2013, path 174 row 37-39.
Thanks
Gilad
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7742 |
by Deleted User23 Jul 2023 08:35 AM |
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0 Replies and 2020 Views
Spatial size issue in executing Decision Tree 2020 0
Started by Deleted User
I am trying to run a Decision Tree based classification using LiDAR and NDVI images. The projection is the same. The pixel size was different, but I resampled the LiDAR to match the NDVI's image pixel size, hoping that would resolve the issue. The spatial extension is slightly different as the sensors were flown separately, and the pixels are not lining up perfectly. Could that be causing the problem I'd be glad to learn a bit more about how data consumption works when working with the Deci...
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2020 |
07 Jul 2023 11:46 AM |
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1 Replies and 2057 Views
FLAASH on WorldView-3 producing negative values 2057 1
Started by Deleted User
I have an 8 band WorldView-3 multispectral image. I am trying to process it to surface reflectance using ENVI. The trouble is I keep getting strong negative values of the reflectance, with no data areas rendered in bright blue, probably due to colour stretching. My procedure is: 1. Import WV3 .TIL file. This imports metadata such as FWHM, gains and offsets. 2. Resize (clip) the raster to remove no data values around the edge of the image. 3. Use the radiometric calibration tool with the ...
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2057 |
by Deleted User05 Jul 2023 02:24 PM |
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0 Replies and 2589 Views
Empty Annotation Layer Crashes ENVI 2589 0
Started by Deleted User
This occurred to me on ENVI for Mac (MacOS 13.3.1, ENVI 5.6.3, XQuartz 2.8.5). It took me a while to figure out why restoring a session file would cause ENVI to crash, so I am posting this here in case someone else runs into the same issue. Not sure if this issue happens on ENVI for Windows/Linux. Steps to reproduce: 1. Add an image (e.g. qb_boulder_msi) 2. From Annotations drop-down menu button select Text 3. Click on the image to create the Annotation layer but don't type any text or a...
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2589 |
02 May 2023 10:40 PM |
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0 Replies and 2308 Views
Multiband operation in ENVI 2308 0
Started by Deleted User
I have 07 bands/layers stacked into one image (say Test.hdr or test.dat) using band stack operation in ENVI. I have 07 floating values (kept in one dimensional array) corresponding to seven bands in a separate text file (e.g. (1.2, 1,3, 0.3, 3.4, 2.1, 2, 1). I want to divide first band of test.dat with first value in my array of 07 Numbers. Then second band of Test.dat with second number in the array and so on. I want to generate the output file as seven bands stacked in one file only. How to g...
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2308 |
30 Apr 2023 11:29 PM |
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1 Replies and 2358 Views
FLAASH with gaps in the SWIR region 2358 1
Started by Deleted User
Hello, I am trying to convert PRISMA images from TOA to BOA using FLAASH, but once prepocessed the spectrum of the FLAASH file gets gaps in the SWIR region. Can you tell what might be causing this Thanks
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1 |
2358 |
by MariM29 Mar 2023 06:06 AM |
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2 Replies and 2408 Views
Envi Classic Loading Image File Multiple Times 2408 2
Started by Deleted User
Envi Classic 5.3.1 RHEL 6.10 HP ProLine Gen9 I'm observing this behavior on one of the systems. After I open an image file and select 'Load Band' from the 'Available Bands List' window, 'Input Data From Disk' window is displayed more than 10-30 times. It should appear once. This happens to the most of images I open specially the first image file. Is this some configuration issue (since this is observed on a one system so far) Thanks in advance. DH
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2408 |
by Deleted User22 Mar 2023 04:49 AM |
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2 Replies and 3096 Views
ENVI vs. ENVI Classic: Identical Data but Different Outputs 3096 2
Started by Deleted User
Using the same input Collection 2, Level-2 Landsat data set (spatially and spectrally subset, values below 0 and above 1 masked, both WGS 1984 UTM Zone 11N, pixels reportedly 30 m) to perform Linear Spectral Unmixing, I observe different ROI pixel coverage and reported areas depending on whether I use ENVI Classic IDL (64-bit) or 'New' (ENVI 5.6.3 IDL 8.8.3, 64-bit). When I use the ROI Tool with the three ROIs that have 6, 6, and 3 pixels (which I created in ENVI 'New'): When I apply thos...
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2 |
3096 |
by Deleted User21 Feb 2023 01:03 PM |
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1 Replies and 2330 Views
Bug in Image Registration Workflow 2330 1
Started by Deleted User
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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1 |
2330 |
by MariM02 Feb 2023 11:54 AM |
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3 Replies and 3072 Views
DEM extraction 3072 3
Started by Deleted User
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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3 |
3072 |
by Deleted User27 Jan 2023 01:12 PM |
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1 Replies and 3242 Views
Subset Data from ROis in ENVI 5.6.2 3242 1
Started by Deleted User
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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1 |
3242 |
by MariM25 Jan 2023 11:00 AM |
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1 Replies and 2670 Views
ASCII file with wavelengths and FWHM 2670 1
Started by Deleted User
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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2670 |
by MariM27 Dec 2022 08:21 AM |
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3 Replies and 3495 Views
EO1-ALi data 3495 3
Started by Deleted User
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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3 |
3495 |
by MariM29 Nov 2022 06:05 AM |