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1 Replies and 21 Views Reordering Spectral Bands  21  1 Started by  Karen Kowalewsky I thought I could reorder the spectral bands in the Raster Management Build Band Stack or Build Layer Stack routine. Apparently not and the combined raster stack has an odd band order of R,G,B,NIR,Red Edge, Deep Blue. The image display doesn't seem to care but spectrally I wonder if it matters. How can I reorder the bands I tried to manually edit in the metadata but received an image that spectrally and visually is incorrect.
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by  Mari MinariJump to last post
12 May 2022 07:26 AM
4 Replies and 132 Views Radiometric Calibration for WorldView 3 SWIR data  132  4 Started by  Yu-Ting Yu Hi, I was working with WorldView 3 SWIR data. For some reason, many areas of my SWIR data will be removed after I apply Radiometric Calibration in ENVI 5.6. When I say 'remove', I mean the area have information in the original data and it became blank after calibration. The product was obtained from L3Harris, originally from Maxer I think. The SWIR band was storage in 11-bit from 1 to 2047. Based on the metadata, the product type was 'Basic 1B'. The followings are the product description from...
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by  Yu-Ting YuJump to last post
05 Apr 2022 04:14 PM
1 Replies and 600 Views netcdf maximum number of variables  600  1 Started by  Kostas Tsigaridis I am trying to create a netcdf file with IDL that will contain 19,000 variables. The code executes without errors, but then the file only contains 8191 variables. I know that the netcdf library has a limit that you can overcome by recompiling in older versions (the limit is gone in very new versions), but how can I get this to work in IDL Thanks
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by  Ben CastellaniJump to last post
14 Mar 2022 05:02 PM
1 Replies and 69 Views IDL_IDLBridge parallel computation  69  1 Started by  WWei XXue Dear all, I am working on IDL parallel computation by using IDL_IDLBridge. One problem arises when I tried to transfer the structure variable from parent to child. Using SetVar does not work! I searched the reason, saying 'Only scalar or array variables of numeric or string type can be transferred. Structures, pointers, and object references cannot be transferred between processes using the IDL_IDLBridge object'. My Structure variable (list variable) contains 56 2000column*1000row matrix. I...
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by  Ben CastellaniJump to last post
14 Mar 2022 11:59 AM
3 Replies and 1135 Views Gain and offset values for Sentinel-2  1135  3 Started by  Ale Briseno Hello! I am new to ENVI and attempting to do a radiometric calibration and dark subtraction on Sentinel 2 L1C images. The metadata in the ENVI header shows 0.000 for the gain and offset values of all of the bands. I believe this is why I am getting 'no data' when I attempt the radiometric calibration. Where can I find or calculate the gain and offset values to input them using the 'Apply Gain and Offset' tool. I haven't found this information in the metadata, but I probably don't know wh...
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by  Mari MinariJump to last post
19 Apr 2021 12:06 PM
0 Replies and 356 Views SarScape Installation  356  0 Started by  jorge lira Upon installation of the package SarScape, the following message appears: “This computer does not seem to have any OpenCL platform suitable for SarScape. Since SarScape 5.1, OpenCL is a strict requirement” It seems to be that SarScape does not recognize the OpenCL platform.
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18 Apr 2021 03:45 PM
1 Replies and 894 Views ROI Statistics  894  1 Started by  CCC MMM Hello all, I am new to this online community and may be asking some random general questions in the coming months. I would like to be able to interpret the statistics of an ROI, using ASTER L2 Surface Temperature (AST_08) data. My main objective is to be able to extract the average temperature within a 100 pixel area. I understand that this can be done by right clicking on the ROI layer and exporting the Statistics to a text file. When I do this, however, I can't make sense of any of the d...
1 894
by  Mari MinariJump to last post
10 Mar 2021 11:07 AM
1 Replies and 1961 Views change color -Nan pixels  1961  1 Started by  alison cramer Hello, Does anyone know if there is a way to change the color of -nan pixels I have masked my shadows, and am now doing band depth images. I would prefer my shadows to show up as a color other than white.
1 1961
by  Mari MinariJump to last post
01 Sep 2020 10:30 AM
0 Replies and 631 Views change color -Nan pixels  631  0 Started by  alison cramer Hello, I am wondering if anyone knows a quick way to change the color of -Nan values in Envi. Doing some band math and band threshold images, and I masked the shadows in my data. Then I did continuum removal, and my shadows are now -Nan values. This is fine, however, I don't want them to be white in the image. Is there an easy way to change them to a different color
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25 Aug 2020 03:06 PM
26 Replies and 9830 Views Access Denied - Verification Pending  9830  26 Started by  Lisa Upton
(Topic has multiple pages1 2 )
Why did I receive an "Access Denied - Verification Pending" error message
26 9830
by  Brandon HenryJump to last post
04 Jul 2020 11:26 AM
1 Replies and 1318 Views SVM on multispectral satellite data  1318  1 Started by  Adomas Liepa Hello everyone, I am using Support Vector Machine (SVM) classifier on ASTER and Sentinel-2 datasets to map geological units. I am familiar with the basic statistical concept of SVM classifier, but in more practical terms, how does it use the spectral data from the satellite imagery to classify different classes How does it determine the most accurate fit from the image-based training dataset Cheers!
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by  Mari MinariJump to last post
27 Apr 2020 05:58 AM
1 Replies and 1305 Views Subset landsat image using ROI  1305  1 Started by  Dennis Kiyeng The final result isn't georeferenced, did I miss something on subset using ROI
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by  Mari MinariJump to last post
19 Feb 2020 10:39 AM
3 Replies and 1194 Views Spectral Hourglass Wizard  1194  3 Started by  Stavroula Giannakopoulou Hello everyone, I have a question regarding the routine of Spectral Hourglass Wizard. I want to implement the procedure of Wizard at my hyperspectral data. So my question is if I should try the MNF procedure. My thought is to see if the results without the step of MNF are also valid. Thank you very much for your help!!!
3 1194
by  Mari MinariJump to last post
06 Feb 2020 05:34 AM
21 Replies and 5928 Views Regarding FLAASH correction  5928  21 Started by  Bisma Qazi
(Topic has multiple pages1 2 )
Hi, I am trying to do atmospheric correction on AWiFS data onboard IRS-P6 using FLAASH module of ENVI 5.1. I have some doubts in the parameters that need to be inputted into the module. In the multispectral settings tab, there is an option for water reference channel, what does it mean Also an option for index to first band is there, If the value is set from 1 to 4, then it displays the following error message. 'filterfunctionfile'.sli doenot contain enough bands for the given input image. plea...
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by  Lari PilotJump to last post
29 Jan 2020 09:38 AM
2 Replies and 681 Views Results from SFF  681  2 Started by  Stavroula Giannakopoulou Hello everyone, I have a question related to the results from SFF. Because of the fact that there are created 4 different images for each mineral, I can't find a solution to combine those data and to create an overall map. Is there a way to solve thisThank you very much in advance!
2 681
by  Stavroula GiannakopoulouJump to last post
06 Jan 2020 03:57 PM
1 Replies and 782 Views Downloading ENVI recorded webinar videos  782  1 Started by  Nasir Hameed I am wondering there is no option available to download ENVI's recorded webinars available online at; https://www.harrisgeospatial.com/Company/Events/Webinar/ Particularly, I am interested to learn SAR data analysis for agriculture applications. These relevant recorded webinar videos are also not available over ENVI's Youtube channel. The users like me who don't have regular internet access prefer to download and listen such useful content to increase understanding about the topic th...
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by  Mari MinariJump to last post
10 Dec 2019 09:10 AM
2 Replies and 777 Views Radiometric normalisation of hyperspectral images  777  2 Started by  Malin Hoeppner Hi, I need to perform radiometric normalisation of two hyperspectral images that were acquired on the same day but do not overlap in order to do supervised classification. I was thinking to mosaic them but the seamless mosaic tool does not work for hyperpsectral data. Otherwise I found the exact tool to match two images using IDL (https://www.harrisgeospatial.com/docs/ENVIRadiometricNormalizationTask.html) but I can't use IDL so am looking for another way in ENVI. Thank you, Malin
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by  Malin HoeppnerJump to last post
08 Dec 2019 10:04 PM
4 Replies and 1387 Views ENVI FLAASH error  1387  4 Started by  Prabha Rupasinghe Hi, I am trying to apply FLAASH to a Landsat 8 image. I receive following error: Problem: The FLAASH program exited with the following errors: ACC error:Adjacents5: IDL error: Attempt to subscript VALUE with UAV is out of range. ACC_ADJACENTS5 ACC_HYPER2 ACC_ACC ENVI_ACC_EVENT ENVI_FLAASH_PROCESS_MANAGER IDLRTMAIN $MAINS$ We recently moved the license from an old computer to a new computer. I get this message after transferring the license and did not get it before. ...
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by  Prabha RupasingheJump to last post
15 Nov 2019 01:12 PM
25 Replies and 5713 Views FLAASH ACC Error  5713  25 Started by  kdsingh85
(Topic has multiple pages1 2 )
Hi Ben, I was trying to use FLAASH for my hyperspectral data atmospheric correction, but it is not processing any data and continuously showing error messages (ACC_AUTOCHAN: No water absorption channels selected). I fixed Error-1 by choosing water absorption band, but I never understand why it is still showing Error-2 (ACC error: convert7; IDL error: End of input record encountered on file unit:0); ACC_CONVERT7 ACC_HYPER2.... I am also attaching my FLAASH restore file. Let me know how I...
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by  Mari MinariJump to last post
28 Oct 2019 01:56 PM
1 Replies and 851 Views Issue with the Y scale factor!  851  1 Started by  Stavroula Giannakopoulou Hello everyone, I am trying to resample a number of spectral signatures from a specific spectral library. The problem is that I can't figure out which is the Y scales factors and the Wavelength units that are asked in the window 'Scale Incoming Curve Data'. Is there a way to identify them somehow Any advice will be very helpful!T hank you very much in advance!
1 851
by  Mari MinariJump to last post
09 Oct 2019 12:22 PM
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