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2 Replies and 1122 Views
histogram - change the binsize 1122 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
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1122 |
by John M Meyer 10 Oct 2023 09:34 AM |
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8 Replies and 3048 Views
band math - if 3048 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
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3048 |
by Marcos Montes15 Sep 2023 07:51 AM |
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0 Replies and 87 Views
ENVI 5 equivalent to User Defined Motion Routine 87 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...
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87 |
15 Sep 2023 07:47 AM |
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1 Replies and 261 Views
No data areas classified 261 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...
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261 |
by Marcos Montes15 Sep 2023 07:16 AM |
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5 Replies and 226 Views
Re-Scale Landsat Data 226 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...
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226 |
by MariM31 Aug 2023 10:28 AM |
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4 Replies and 3973 Views
Error in opening landsat 8 tif 3973 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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3973 |
by Bao Tran Tran23 Jul 2023 08:35 AM |
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0 Replies and 142 Views
Spatial size issue in executing Decision Tree 142 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...
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142 |
07 Jul 2023 11:46 AM |
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1 Replies and 102 Views
FLAASH on WorldView-3 producing negative values 102 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 ...
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102 |
by Glen Shennan05 Jul 2023 02:24 PM |
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0 Replies and 285 Views
Empty Annotation Layer Crashes ENVI 285 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...
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285 |
02 May 2023 10:40 PM |
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0 Replies and 244 Views
Multiband operation in ENVI 244 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...
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244 |
30 Apr 2023 11:29 PM |
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1 Replies and 243 Views
FLAASH with gaps in the SWIR region 243 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
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243 |
by MariM29 Mar 2023 06:06 AM |
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2 Replies and 294 Views
Envi Classic Loading Image File Multiple Times 294 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
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294 |
by Dan Hahn22 Mar 2023 04:49 AM |
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2 Replies and 300 Views
ENVI vs. ENVI Classic: Identical Data but Different Outputs 300 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...
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2 |
300 |
by Krista West21 Feb 2023 01:03 PM |
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1 Replies and 242 Views
Bug in Image Registration Workflow 242 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 |
242 |
by MariM02 Feb 2023 11:54 AM |
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3 Replies and 880 Views
DEM extraction 880 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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880 |
by J. Miguel Quintana27 Jan 2023 01:12 PM |
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1 Replies and 246 Views
Subset Data from ROis in ENVI 5.6.2 246 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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246 |
by MariM25 Jan 2023 11:00 AM |
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1 Replies and 453 Views
ASCII file with wavelengths and FWHM 453 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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453 |
by MariM27 Dec 2022 08:21 AM |
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3 Replies and 1408 Views
EO1-ALi data 1408 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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1408 |
by MariM29 Nov 2022 06:05 AM |
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3 Replies and 336 Views
FLAASH Issue? 336 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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3 |
336 |
by MariM28 Nov 2022 10:12 AM |
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2 Replies and 388 Views
Statistics Issues 388 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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388 |
by Karen Kowalewsky25 Nov 2022 11:40 AM |