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0 Replies and 81 Views Change Color Table  81  0 Started by  Marcos Montes 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', ...
0 81
13 Feb 2024 12:47 PM
0 Replies and 95 Views Replacing pixel values depending on minimum value band.  95  0 Started by  Matti Roivainen 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...
0 95
30 Jan 2024 09:42 AM
2 Replies and 1272 Views histogram - change the binsize  1272  2 Started by  Catherine K. 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
2 1272
by  John M MeyerJump to last post
10 Oct 2023 09:34 AM
8 Replies and 3342 Views band math - if  3342  8 Started by  Sarah Harris 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
8 3342
by  Marcos MontesJump to last post
15 Sep 2023 07:51 AM
0 Replies and 223 Views ENVI 5 equivalent to User Defined Motion Routine  223  0 Started by  Marcos Montes 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...
0 223
15 Sep 2023 07:47 AM
1 Replies and 346 Views No data areas classified  346  1 Started by  Vistorina Amputu 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...
1 346
by  Marcos MontesJump to last post
15 Sep 2023 07:16 AM
5 Replies and 359 Views Re-Scale Landsat Data  359  5 Started by  Krista West 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...
5 359
by  MariMJump to last post
31 Aug 2023 10:28 AM
4 Replies and 4398 Views Error in opening landsat 8 tif  4398  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
4 4398
by  Bao Tran TranJump to last post
23 Jul 2023 08:35 AM
0 Replies and 259 Views Spatial size issue in executing Decision Tree  259  0 Started by  Ildiko Pechmann 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...
0 259
07 Jul 2023 11:46 AM
1 Replies and 177 Views FLAASH on WorldView-3 producing negative values  177  1 Started by  Glen Shennan 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 ...
1 177
by  Glen ShennanJump to last post
05 Jul 2023 02:24 PM
0 Replies and 414 Views Empty Annotation Layer Crashes ENVI  414  0 Started by  Kevin Davies 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...
0 414
02 May 2023 10:40 PM
0 Replies and 383 Views Multiband operation in ENVI  383  0 Started by  Chander Shekhar 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...
0 383
30 Apr 2023 11:29 PM
1 Replies and 331 Views FLAASH with gaps in the SWIR region  331  1 Started by  Douglas Santos 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
1 331
by  MariMJump to last post
29 Mar 2023 06:06 AM
2 Replies and 374 Views Envi Classic Loading Image File Multiple Times  374  2 Started by  Dan Hahn 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
2 374
by  Dan HahnJump to last post
22 Mar 2023 04:49 AM
2 Replies and 481 Views ENVI vs. ENVI Classic: Identical Data but Different Outputs  481  2 Started by  Krista West 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...
2 481
by  Krista WestJump to last post
21 Feb 2023 01:03 PM
1 Replies and 319 Views Bug in Image Registration Workflow  319  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...
1 319
by  MariMJump to last post
02 Feb 2023 11:54 AM
3 Replies and 959 Views DEM extraction  959  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
3 959
by  J. Miguel QuintanaJump to last post
27 Jan 2023 01:12 PM
1 Replies and 400 Views Subset Data from ROis in ENVI 5.6.2  400  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...
1 400
by  MariMJump to last post
25 Jan 2023 11:00 AM
1 Replies and 579 Views ASCII file with wavelengths and FWHM  579  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
1 579
by  MariMJump to last post
27 Dec 2022 08:21 AM
3 Replies and 1492 Views EO1-ALi data  1492  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.
3 1492
by  MariMJump to last post
29 Nov 2022 06:05 AM
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