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2 Replies and 538 Views
IDL_IDLBridge parallel computation 538 2
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 Jasmine Kurb 05 Apr 2023 01:11 AM |
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1 Replies and 543 Views
map3d ? 543 1
Started by Ronn Kling
I've looked around and not found anything. The demo has a direct graphics one. I see from the help that plot3d does have a mapForward and mapinverse, so maybe I could use that Of course, I'm pressed for time and if anyone has a example using plot3d I would appreciate it. I want to put a satellite orbit over the earth. -Ronn
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543 |
by Ben Castellani11 Aug 2022 01:59 PM |
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3 Replies and 471 Views
Execution Failed Error - Displacement Mapping 471 3
Started by Antóin O'Sullivan
Hello, I ran into an error when attempting to follow the self-paced training video for displacement mapping in SARscape on the ENVI application. After attempting the first step in the video (to run the displacement mapping program from the toolbox) I got an error that said 'Execution Failed &91;Process Import&93;, &91;Directory not found EC:40020&93;' It referenced the output folder as a potential cause of the error. I downloaded the course data from the website again, and tried closing and ...
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471 |
by Mari Minari17 Jun 2022 09:32 AM |
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4 Replies and 389 Views
Format for inputting metadata 389 4
Started by Karen Kowalewsky
What is the text format for inputting spectral band gains/offsets I created a text file with the gains for 400 bands I get an error massage that the number of lines and number of elements to not match. I have 400 lines, two columns band number and gain value. How is this file supposed to be assembled short of me fat fingering these values in the gui Thanks,
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by Karen Kowalewsky15 Jun 2022 07:12 AM |
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2 Replies and 503 Views
Reordering Spectral Bands 503 2
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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503 |
by Karen Kowalewsky13 Jun 2022 01:47 PM |
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4 Replies and 568 Views
Radiometric Calibration for WorldView 3 SWIR data 568 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 Yu05 Apr 2022 04:14 PM |
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1 Replies and 1158 Views
netcdf maximum number of variables 1158 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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1158 |
by Ben Castellani14 Mar 2022 05:02 PM |
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3 Replies and 2049 Views
Gain and offset values for Sentinel-2 2049 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 Minari19 Apr 2021 12:06 PM |
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0 Replies and 935 Views
SarScape Installation 935 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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935 |
18 Apr 2021 03:45 PM |
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1 Replies and 1560 Views
ROI Statistics 1560 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...
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1560 |
by Mari Minari10 Mar 2021 11:07 AM |
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1 Replies and 2941 Views
change color -Nan pixels 2941 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.
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2941 |
by Mari Minari01 Sep 2020 10:30 AM |
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0 Replies and 1078 Views
change color -Nan pixels 1078 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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1078 |
25 Aug 2020 03:06 PM |
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11935 |
by Brandon Henry04 Jul 2020 11:26 AM |
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1 Replies and 1724 Views
SVM on multispectral satellite data 1724 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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1724 |
by Mari Minari27 Apr 2020 05:58 AM |
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1 Replies and 1708 Views
Subset landsat image using ROI 1708 1
Started by Dennis Kiyeng
The final result isn't georeferenced, did I miss something on subset using ROI
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1708 |
by Mari Minari19 Feb 2020 10:39 AM |
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3 Replies and 1699 Views
Spectral Hourglass Wizard 1699 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!!!
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1699 |
by Mari Minari06 Feb 2020 05:34 AM |
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21 Replies and 6936 Views
Regarding FLAASH correction 6936 21
Started by Bisma Qazi
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 Pilot29 Jan 2020 09:38 AM |
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2 Replies and 1021 Views
Results from SFF 1021 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!
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1021 |
by Stavroula Giannakopoulou06 Jan 2020 03:57 PM |
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1 Replies and 1213 Views
Downloading ENVI recorded webinar videos 1213 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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1213 |
by Mari Minari10 Dec 2019 09:10 AM |
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2 Replies and 1221 Views
Radiometric normalisation of hyperspectral images 1221 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 Hoeppner08 Dec 2019 10:04 PM |