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1 Replies and 1054 Views
ReprojectRaster tool 1054 1
Started by Deleted User
Hello, all of a sudden I can no longer call EnviTask 'ReprojectRaster', nor use the tool within ENVI - it says it does not exist. Any idea how this happened or how I can fix it Version ENVI 5.4 IDL 8.6
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1054 |
by MariM 03 Jun 2021 07:27 AM |
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1 Replies and 1262 Views
Export All Raster Bands 1262 1
Started by Deleted User
Hello. I performed atmospheric correction and PCA on a hyperspectral raster in ENVI, and I would like to export all raster bands and PCA components so that they may be analyzed in R. Using Export to TIFF creates only a raster with 3 bands, which is not the 170 bands I need. Is there any way to do this in ENVI
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1262 |
by MariM04 May 2021 12:25 PM |
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6 Replies and 3138 Views
WorldView-2 Radiometric calibration 3138 6
Started by Deleted User
Dear team at Harris Geospatial, I saw in the Envi 5.6 release notes under 'Fixed issues' that the 'Radiometric calibration of WorldView data was incorrect.' (ENVI-72153). Does this mean that the calibration with earlier versions was not correct What are the new parameters How big is the difference From my understanding Envi was calculating the Gain from the WorldView metadata file (gain = 0.1* AbsCalF actor / FWHM) and the offset was set to 0. However, Digital Globe published adjusting...
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3138 |
by MariM10 Mar 2021 06:00 AM |
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5 Replies and 2523 Views
FLAASH - zenith and azimuth angle for WorldView-2 2523 5
Started by Deleted User
Dear Team at Harris Geospatial, when I add the zenith and azimuth angles for an image from the off-nadir WorldView-2 sensor taken in New Zealand, the reflectance values in the coastal and blue bands decline to values under zero even in vegetated areas outside shadow and water bodies. I am already using parameters with low water vapor and aerosol according to the clear atmosphere in New Zealand (US standard atmosphere, maritime aerosol, 70km visibility). I wonder if I did something wrong with ca...
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2523 |
by Deleted User20 Feb 2021 03:01 PM |
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9 Replies and 2822 Views
Calibrating Landsat TM and ETM with ENVI 4.7 2822 9
Started by Deleted User
Hello Guys,
this is Vera from Germany!
I feel like an absolute beginner with ENVI and there are several problems I have with Opening Landsat (TM and ETM) Metadata Files with ENVI.
My Goal is to send the file through calibration processing. Program used: ENVI 4.7.; Image is Landsat 7 ETM.
My proceeding:
I downloaded a Level 1 Landsat Data File (27 Feb 2000), unzipped it etc.
The unzipped file is this (copied from metadata.txt):
FILE_NAME_BAND_1 = "LE71940252000058EDC00_B1.TIF"...
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9 |
2822 |
by Deleted User19 Feb 2021 02:24 PM |
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4 Replies and 17912 Views
ENVI 5.4 Trial Version 17912 4
Started by Deleted User
Dear Sir or Mam
I want to know that, is there any trial version for envi 5.4 and idl 8.6 could you guide me please
sincerely,
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4 |
17912 |
by Deleted User15 Feb 2021 04:50 AM |
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1 Replies and 1131 Views
Principal component analysis 1131 1
Started by Deleted User
I am trying to reproduce the PCA implemented in ENVI with IDL. I get the same covariance matrix but when I compute the eigenvectors (by using EIGENQL) I get some different results. The eigenvectors have the same shape but somethimes change sign so the final result is not the same. The same behaviour is obtained if I use the PCOM function. How does ENVI compute the eigenvectors of the covariance matrix Thanks, John
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1131 |
by MariM01 Feb 2021 10:06 AM |
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2 Replies and 1461 Views
AST_05 (Surface Emissivity) 1461 2
Started by Deleted User
Should i apply atmospheric correction AST_05 (Surface Emissivity TIR) data. Also which gets better results for geological features AST_05 (surface emissivity TIR) or AST_09T (surface radiance TIR)
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1461 |
by Deleted User28 Jan 2021 12:29 PM |
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0 Replies and 1788 Views
Class Distribution (SAM) 1788 0
Started by Deleted User
Hi. I am working with AST_07XT(atmospherically and cross talk corrected) product of ASTER in ENVI Classic 5.3. When i use supervised classification method with Spectral Angle Mapper (SAM) algorithm, i open a single color image to display overlay classification. Then i have a look class distribution to decide about which classes i sould convert to vector for GIS. For example i see 15 distribution of hornblend (USGS Spec. Lib.) when choose class ditribution on classification interactive tool opti...
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1788 |
27 Jan 2021 05:04 PM |
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1 Replies and 1503 Views
envi 5.3 hangs just first time 1503 1
Started by Deleted User
I have installed envi 5.3.1 on Linux, also on Windows. The first time I run envi ($envi -classic on Linux) it takes a long time for the popoup window to respond. It hangs for more than 30 minutes. The next times it works fine I have tried: - delete .idl (on user home) - run idl, then run .FULL_RESET_SESSION and restart the computer but it didn't work. Can somebody help me Thanks in advance.
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1503 |
by Deleted User20 Jan 2021 02:25 AM |
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0 Replies and 1664 Views
MNF statistics 1664 0
Started by Deleted User
Hello, I am filtering some hyperspectral data by using the inverse MNF transform. Doing the inverse transform, I eliminate the noisiest MNF components. How do I get an estimate of the signal percentage lost in the denoised data Thanks, John
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1664 |
07 Jan 2021 07:18 AM |
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0 Replies and 1630 Views
Unable to save Custom Equirectangular projection parameters values 1630 0
Started by Deleted User
Hi, I am using ENVI 5.5 and while saving custom Equirectangular projection, the input parameters are not saved correctly in the projection file (map_proj.txt). I am giving different values of parameters but all the values (for Sphere radius, latitude of true scale, longitude of center meridian) are saved as 0 in the projection file (map_proj.txt). Please help me with this issue.
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1630 |
28 Dec 2020 01:10 AM |
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1 Replies and 1564 Views
ENVI modeler: layer stack from multispectral and panchromatic 1564 1
Started by Deleted User
I am trying to use ENVI modeler (I do not have access to IDL), in ENVI 5.6 to process some Worldview-2 satellite imagery. What I have: Worldview-2, level 1b imagery Each 'image strip' consists of 7 multispectral and 7 associated panchromatic images. A .imd file provides information for image calibration A rpc file provides information for orthorectification. What would like to do: Use modeler to open each of the 7 multispectral files, and calibrate to TOA, the orthorectify the ima...
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1564 |
by Deleted User21 Dec 2020 02:00 PM |
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4 Replies and 2074 Views
ENVI 5.3 classic startup issue - envi_check_updates / json_parse error 2074 4
Started by Deleted User
ENVI 5.3 classic mode does not seem to run across our Linux systems anymore. Below is the full error: JSON_PARSE: Unknown JSON, expecting true, false, null, number, string, '{', or '&91;' : / Execution halted at: ENVI_CHECK_UPDATES 594 ENVI_CLASSIC 493 ENVI 445 $MAIN$
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2074 |
by Deleted User12 Nov 2020 12:00 PM |
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5 Replies and 2455 Views
ASTER 07XT Available Band List 2455 5
Started by Deleted User
I want to work with '07XT_ASTER L2 Surface Reflectance VNIR and Crosstalk Corrected SWIR V003' product. So recently i order and download ASTER scene ( AST_07XT_00305192005082601_20201001075438_21295.hdf and *.hdf.met files) for my project. I order this AST_07XT data level because i don't want to apply any atmospheric or cross talk correction to AST_L1T data set. But when i import the data to ENVI 5.3, band order and wavelengths are listed as below; ASTER VNIR Band1: 0.6610 ASTER VNIR Ban...
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5 |
2455 |
by MariM03 Nov 2020 05:56 AM |
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1 Replies and 1751 Views
ENVI modeler specify stretch with Max and Min value 1751 1
Started by Deleted User
I am trying to use ENVI modeler to speed up my raster stretch process for many images. However, one aspect that slows me down is that I would like to perform a square root stretch in envi modeler. To do this I need to first calculate statistics for each file, and add in the min and max values as a vector for each band (e.g. &91;12,74,160,619,42,138,1293&93;). Is there a way to speed this up by specifying that I just want the module to use the minimum and maximum values for each band (e.g. &91...
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1751 |
by Deleted User26 Oct 2020 02:43 PM |
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3 Replies and 1647 Views
FeatureExtraction Workflow problem 1647 3
Started by Deleted User
Hi, we discovered that after running the classification in the workflow, if you go back to alter your segments (or change attributes), the Next button is grayed out/non selectable. also classes cannot be saved at this point. So, you have to start from scratch. is there any way around this it seems going back and forth would be part of a 'workflow' and would improve the final classification. (ENVI 5.5.3).
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1647 |
by Deleted User08 Oct 2020 08:58 AM |
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1 Replies and 1412 Views
Capturing ENVI commands in IDL 1412 1
Started by Deleted User
Hello, I am trying to help a Ph.D. student process ~80 satellite images. She has a series of steps -Combine 66 img files into one file with that many bands. -Aggregate to a lower resolution -Convert to geotiff -extract regions of interest (ROIs) She can do all this with ENVI manually, but it sure would be nice to automate to process. I have coded in IDL before (it's been a while, but I remember the basics). What I am hoping is that there's a way to see the underlying IDL command b...
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1412 |
by Deleted User01 Oct 2020 08:25 AM |
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2 Replies and 1551 Views
no data value dropped in layer stack 1551 2
Started by Deleted User
I have a large Worldview 3 scene that is composed of a panchromatic image and a multispectral image. I am using ENVI modeler to create a layer stack of the pan, multispectral, and some veg indices (e.g. NDVI). I need the resulting stack to be in byte data format (0-255) At the start of my process the multispectral and pan band images have a no data value of 0. From the multispectral I create the indices I need, then perform a linear percent stretch raster. I also stretch the multispectral ban...
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1551 |
by Deleted User23 Sep 2020 09:21 AM |
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1 Replies and 1438 Views
Stretch error with large raster 1438 1
Started by Deleted User
I have a large raster (42212 x 232880, unsigned integer pansharpened WV-3 image strip, saved as an ENVI .dat file) that I would like to convert to byte data with a square root stretch. When I choose 'stretch data' and choose 'equalize' or 'square root', by percent, with output values from 0-255, I get an error: 'stretch_doit: An error has occurred during processing Error: 'attempt to subscript IN_HIST with LOC is out of range' The result may be invalid'. If I select ok, the process ends and...
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1438 |
by Deleted User28 Aug 2020 01:42 PM |