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2 Replies and 2975 Views
Radiometric and atmospheric correction in UAV images 2975 2
Started by Deleted User
hi everybody, i am running a demo version ENVI 5.5. I have many troubles in the radiometric and atmospheric correction in UAV image with parrot sequoia multispectral sensor. I don't know which metadata file to open and generally all the process. when I run worldview 2 image, works perfectly. don't understand what i do wrong. Can you help me to overcome this problem Moreover, I test a module crop science, when i import a multispectral image works very well but this does not happen when i impo...
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by Deleted User 03 Aug 2018 07:09 AM |
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1 Replies and 1756 Views
Classification Workflow Not Responding 1756 1
Started by Deleted User
I have two hyperspectral datasets. One I consider to be the 'original' dataset and the other which has been clipped to remove areas of substrate prior to classification. When I run the original data set through the classification workflow (using MLC) it works fine and gives a good output. However, when I attempt the same process on the clipped data set the workflow does not respond for a long time before resetting itself. I do use different sets of ROI's for both. I don't know if by clipping ...
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by MariM30 Jul 2018 08:52 AM |
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1 Replies and 1820 Views
ENVITask('RasterViewShed') 1820 1
Started by Deleted User
For the RasterViewshed task: 1) It seems like Pixel_Location is specified as pixel indices. Is this the only acceptable format In other words, could one specify a lat/lon or UTM coordinates instead Also, in the example on the help pages, the file is subset first (see http://www.harrisgeospatial.com/docs/ENVIRasterViewshedTask.html). The pixel location is then explicitly with respect to the subset, right Is there a way to specify the pixel location with respect to the original coordinat...
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1820 |
by MariM20 Jul 2018 03:26 PM |
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3 Replies and 1723 Views
Reprojection method used by ENVI layer stacking of rasters of different projections 1723 3
Started by Deleted User
Hi, I notice that ENVI's tool 'Reproject Raster' needs to select a conversion parameter of Method from Polynomial, Triangulation and Rigorous. When I do 'Layer Stacking' of rasters of different projections, ENVI automatically reproject the rasters to the same projection for me. But I can't find out what conversion parameter of Method the Layer Stacking uses for the reprojection. I seem to have no control over this reprojection parameter in the Layer Stacking. I have a few rasters that are re...
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1723 |
by MariM20 Jul 2018 11:52 AM |
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1 Replies and 1827 Views
Errors adding extension to ENVI 5.4 1827 1
Started by Deleted User
I think I may have something basically wrong in the way I am working with ENVI extensions. In IDL, I’ve created a linked project that points to my code in my development folder. When I’m ready to test it I copy the code over to the ENVI extensions folder: C:\Program Files\Harris\ENVI54\extensions When ENVI runs, it shows my project in the correct extensions folder and the project executes correctly. However, it also shows the list of the sub-procedures that project calls and flags an err...
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1827 |
by Deleted User17 Jul 2018 02:47 PM |
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2 Replies and 1598 Views
idenifying diced element of image 1598 2
Started by Deleted User
I diced a photomosaic into 50 meter squares, yielding about 64 tiles. I can't figure out how to ID which tile in the photo corresponds to any particular .dat file in the Layer Manager. Thanks
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1598 |
by Deleted User12 Jul 2018 01:41 PM |
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5 Replies and 1958 Views
ENVI_FILE_OPEN Fid returning -1 1958 5
Started by Deleted User
Code excerpt outfile = '/home/ims/ims/src_bobg/nowice2/Scaled_AMSR2.dat' openw, uunit, outfile, /get_lun writeu, uunit, dataref2 free_lun, uunit ; envi, /restore_base_save_files envi_open_file, outfile, r_fid=fid /NO_REALIZE No matter what I do, this returns -1. Is there something obvious that I'm missing
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by MariM09 Jul 2018 09:10 AM |
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3 Replies and 1612 Views
Big georeferenced-based mosaic 1612 3
Started by Deleted User
Hello, Since > 10 years, I strongly appreciate the memory allocation of ENVI. But this time, I am quite upset since the georeferenced-based mosaic can only be implemented in manually tiling the dataset by a factor 10... I can create a RGB mosaic with 14000 x 900 dimensions, but impossible to create a 14000 x 1800, and even less a 14000 x 9000 despite the 64-bit version, an i9 processor (10 cores) and 64 Go RAM. Hereafter is the recurrent message: ENVI Retrieve Data: An error has occurr...
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by MariM09 Jul 2018 08:16 AM |
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1 Replies and 1724 Views
FLAASH atm correction without water retrieval 1724 1
Started by Deleted User
Hello, We have a hyperspectral imager that cover the region between 670 nm and 780 nm. Thus we don't have a water retrieval band. I used FLAASH to perform some atm correction and I selected NO water retrieval. However, I still got the error that says ''No water absorption channels selected'. Is there a way to bypass the water retrieval
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1724 |
by MariM03 Jul 2018 05:53 AM |
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3 Replies and 1493 Views
ENVI 5.5: How to add a new spectral library 1493 3
Started by Deleted User
Hello, I would like to use a spectrum I downloaded, but I didn't succeeded to load it in ENVI. I have a .txt files like this one: S07WV3 Record=4157: Montmorillonite-Na CU93-52A BECKc AREF 1.9322328e-001 2.5150448e-001 3.4166631e-001 4.2895776e-001 4.5956072e-001 4.8911583e-001 5.0407648e-001 5.0435984e-001 5.2898306e-001 5.2644795e-001 5.3021705e-001 5.2787507e-001 4.7677675e-001 4.5206088e-001 4.5573318e-001 4.3987176e-001 Can you help me figure this...
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1493 |
by MariM14 Jun 2018 10:05 AM |
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2 Replies and 1655 Views
ENVI 5.5: Percentiles 1655 2
Started by Deleted User
Hello, I have a band ratio image and I would like to save the image as a geotiff and just include the 90th percentile. Do you have an idea to do that precisely without using Interactive Stretching Thank you, Ludovic
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by Deleted User14 Jun 2018 07:46 AM |
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2 Replies and 1721 Views
ForwardPCATransform Parameters 1721 2
Started by Deleted User
I would like to apply 'Forward PCA Rotation New Statistics and Rotate' model in ENVI on 500 images using 'ForwardPCATransform' task, but I could not find any document about the 'ForwardPCATransform' task parameters. For Example how to define 'Mask Band' or how to define 'Stats Subset' or 'output State file name' or calculate using 'Covariance Matrix or Correlation matrix' or 'Number of Output PC Bands'. Any idea Thanks
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by Deleted User09 Jun 2018 03:42 AM |
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1 Replies and 1515 Views
Modify Preferences 1515 1
Started by Deleted User
I'm using ENVI 5.2. I want to change the 'processing tile size' preference under file -->preferences, as described here: http://www.harrisgeospatial.com/docs/Preferences.html However, my preferences options ends at 'Display Errors on Screen', and the 'processing tile size' menu isn't even visible. Is there some other way to modify this option in ENVI Thanks.
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1515 |
by MariM07 Jun 2018 06:03 AM |
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1 Replies and 1579 Views
Exact spectral bands for NDVI 1579 1
Started by Deleted User
I have a hyperspectral image and am using vegetation index calculator to calculate NDVI. My question is what are the exact bands that ENVI uses for NDVI band calculation in the documentation, it says NIR and Red which is a broad definition. I couldn't find the narrowband NDVI bands.
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1579 |
by MariM06 Jun 2018 10:55 AM |
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5 Replies and 3338 Views
MNF and Hyperion 3338 5
Started by Deleted User
Greetings,
I am trying to perform a Forward MNF Rotation using noise statstics from a Hyperion scene, and am consistently receiving the same error regardless of how many bands or spatial extent that I have run through the MNF. When I run the MNF, I receive the following error:
"The numer of pixels in the shift difference spatial subset should be greater than the number of input bands. Please enlarge the spatial subset for noise statistics."
I have tried this in both ENVI ...
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3338 |
by MariM05 Jun 2018 10:30 AM |
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2 Replies and 3587 Views
Atmospheric correction with Worldview 3 image 3587 2
Started by Deleted User
I have a worldview 3 image (Level 1B product with 17 bands, 1 Pan, 8 MS, and 8 SWIR). I need to apply an atmospheric correction to the image. After I apply radiometric calibration with ENVI 5.4, SWIR bands result in no data pixels in some areas covered with water. This happens with both FLAASH settings and default settings in radiometric calibration. As I understand, only option I have with ENVI is I can apply QUAC for the original image. Then apply (B1 le 0)*0(B1 ge 10000)*1(B1 gt 0 and B1 lt...
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by Deleted User04 Jun 2018 09:05 PM |
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1 Replies and 1798 Views
Modeler process 1798 1
Started by Deleted User
i try to work in the modeler for doing calibration and make a mosaiking, because i work with many imagenes, but it result a little difficult because in the mosaiking process when i want to select the imagen which i want to be the 'Reference'. i would like some help for doing this. Also, i would like to know if is it possible to conect that process with a decision tree. thank you
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by MariM29 May 2018 11:36 AM |
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1 Replies and 1719 Views
No Data Problem in Calculations 1719 1
Started by Deleted User
Hi there, I was recently searching for a solution for not considering NoData values in ENVI calculations, but I was not able to find any solution in the user guides or even online. Basically, I have a big chunk of images organized in large time series, witch results in more than 300 bands (dates) images. My initial purpose is to calculate a few statistics based on this images, followed by vegetation indexes (per date). Obviously, NoData (witch in my MODIS images have the value of -9999) can ...
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by MariM29 May 2018 10:45 AM |
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1 Replies and 1771 Views
Surface Temperature in Landsat 5 TM 1771 1
Started by Deleted User
Hello! For get Surface temperature in Lansat7, 8 and ASTER y follow this steps. 1) Radiometric Calibration (radiance). 2)Thermal Atmospheric Correction. 3) Emissivity Normalization. But in Landsat 5 is not possible to run 'Atmospheric Correction' because it needs more than one thermal band! The Brightness Temperature I can get using Radiometric Calibration is not comparable to Surface Temperature. So, I can jump the 'Atmospheric Correction' and just use 1) Radiometric Calibration. 2)Emissivity N...
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1771 |
by MariM29 May 2018 10:28 AM |
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3 Replies and 2531 Views
Tasseled Cap in Landsat 8 2531 3
Started by Deleted User
Hello! I know that TassCap use coefficients derived from Landsat images (MMS, TM), in case of Landsat 8 it's necesary to redefine those coefficients What if I perform a Spectral Subset to Landsat 8, saving just the same 6 bands present in Landsat 7 and apply the Tasseled Cap transformation in ENVI selecting this Pseudo Landsat 7 TM (derived from Landsat 8) thanks for any comment José Manuel Lattus
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by Deleted User23 May 2018 10:25 AM |