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1 Replies and 2341 Views Reflectance formula for SPOT 6  2341  1 Started by  mega I have tried to calculate manually from digital number to radiance for SPOT 6. The result is the same with Envi Tool that is from DN to radiance. But, when I calculate manually from radiance to reflectance, the result is not the same with Envi Tool. So, how the formula to Envi to calculate radiance to reflectance for SPOT 6
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by  MariMJump to last post
24 Jan 2019 05:23 AM
3 Replies and 2256 Views Iterative SVM classification  2256  3 Started by  Prabha Rupasinghe Hello, I am trying to iterate SVM classification for 100 outputs and I need classification error matrices for all 100 outputs so that I can perform some statistical analysis to compare time series. I need to do this for several time series for two sites, so I guess my only option is using IDL as this is lots of work to be done manually. I used the IDL example given in the link; https://www.harrisgeospatial.com/docs/ProgrammingGuideClassification_CodeExampleSVMAPIObjects.html for my images. I ch...
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by  MariMJump to last post
16 Jan 2019 01:08 PM
2 Replies and 3959 Views Convert an image with BSQ to BIL or BIP  3959  2 Started by  Stavroula Giannakopoulou Hello!I have a very simple question about my image. It' s an image that is radiometrically corrected with bsq interleave. I want to convert it to bil or bip in order to correct it atmospherically with the FLAASH method, but I don't know how!Any advice will be very useful! Thank you very much in advance!
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by  Stavroula GiannakopoulouJump to last post
16 Jan 2019 10:10 AM
0 Replies and 21391 Views Access Denied - Verification Pending  21391  0 Started by  jeong hoon hyun As stated in the subject, why did I receive an 'Access Denied - Verification Pending' error message when I clicked 'Downloads' in my account page to download 'IDL'. How can my account be verified
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19 Dec 2018 03:35 AM
1 Replies and 2384 Views BASE IS ARBITRARY error  2384  1 Started by  kdsingh85 Hi, I can't open a file in ENVI associated with the below .HDR file. It is showing 'BASEISARBITRARY' error. Let me know what is this 'BASEISARBITRARY' means Thanks, Keshav ---------------.HDR File-------------------- ENVI description = &91;' Georeferenced Image built from input GLT. &91;'Mon Sep 17 16:36:09 2018'&93;'&93; samples = 1326 lines = 932 bands = 150 header offset = 0 file type = ENVI Standard data type = 4 interleave = bip sensor type = Unknown byte order ...
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by  MariMJump to last post
03 Dec 2018 07:17 AM
4 Replies and 2454 Views Sub-pixel classification to Sentinel 2 images  2454  4 Started by  Prabha Rupasinghe Hi, I am trying to use sub-pixel classification to Sentinel 2 image to map an invasive plant. I tried spectral hourglass wizard and tried to modify the endmembers by comparing the ROIs with my image to be classified. I need only 5 classes for my end product. Should I use only the endmembers for those 5 classes or should I use all the possible endmembers Also, the SAM classification results at the end is very poor. Can I use another set of ROIs I created to re-run another classification method (...
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by  Prabha RupasingheJump to last post
10 Oct 2018 10:41 AM
1 Replies and 2354 Views TOA conversion  2354  1 Started by  zarifet I have a set of Landsat images (TM, ETM and OLI) for change detection analysis and I would like to convert Top of the Atmosphere OLI images from 16-bit to 8-bit. How to do it with ENVI 5.3. Thank you in advance
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by  MariMJump to last post
20 Sep 2018 08:37 AM
4 Replies and 3819 Views Combining classified images in ENVI  3819  4 Started by  Prabha Rupasinghe Hello, I am using Sentinel 2 images for image classification for a pretty large area. So I had to break the images into smaller blocks before classification and process them separately. Now I want to do a change detection for the entire area at once. Is there a way to combine these blocks into a one classified image in ENVI I could not find a specific tool for that. I tried to do it with ArcGIS, but couldn't find a good way to do it. I really appreciate any help on this. Thank you!
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by  MariMJump to last post
21 Aug 2018 04:07 PM
1 Replies and 2630 Views Color a number of pixels in a grayscale image  2630  1 Started by  Malcolm Druett I have grayscale images and wish to highlight specific, fairly large groups of pixels in each image, e.g. by re-coloring those pixels. I have arrays of all the pixels to highlight for each image. Overplotting with a transparent mask seems like an arduous way to go about this. Is there a better way Thanks.
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by  MariMJump to last post
05 Jul 2018 06:54 AM
15 Replies and 3525 Views ENVI - Estimate Noise Statistics From Data - Error  3525  15 Started by  Vicente Jeria Hi everyone! I have this problem: when I am calculating the Estime Noise Statistics From Data in ENVI, I get the following error: 'The number of the pixels in the shift difference spatial subset should greater than the number of input bands. Please enlarge the spatial subset for noise statistics'. In other topic, I read that this problem may occur due bad bands, maybe identical min and max values or values equal to 0 and that I have to edit the header of image. In this sense, I don´t know how...
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by  MariMJump to last post
06 Jun 2018 06:33 AM
0 Replies and 22257 Views Problem with the projection of Worldview 3 image  22257  0 Started by  Tharindu Abeysinghe Hi, I have a WorldView 3 image with multispectral (only 8 bands; Coastal, Blue, Green, Yellow, Red, Rededge, NIR1, NIR2) and panchromatic band. I can open one (either multispectral or panchromatic) of them without any problem in ENVI 5.4. But when I open both images in same ENVI window, both multispectral and panchromatic bands get distorted (looks like both are projected to a different coordinate system). Both images are in Geographic coordinate system- GCS_WGS_1984, Datum- D_WGS_1984. Can ...
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14 May 2018 07:21 PM
6 Replies and 3138 Views SVM classification for multiple scenes with one set of ROIs  3138  6 Started by  Prabha Rupasinghe I am trying to classify Sentinel 2 images for a very large area using the SVM classification. Currently, I can only process an area about 25 sq km at a time to get the desired accuracy. I also explored other classification methods but only SVM gives me good accuracy for my purpose. As my area is very large, it takes me ever to define ROIs for small pieces of images. Is there a way I can use a single set on ROIs for all my pieces Or is there any other method to make this process easier and fast...
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by  Prabha RupasingheJump to last post
11 May 2018 10:47 AM
1 Replies and 1767 Views DarkSubtractionCorrection Task  1767  1 Started by  Deleted User Running the 'DarkSubtractionCorrection' task in an API on reflectance values from a calibrated Worldview 2 data where the image boundary data has a pixel state of 1 are being calculated as negative values on the output raster. How do I stop this Here is the section of code doing the calculation (with forcing 'data ignore value' param). ;***Add data ignore value to the metadata **** IF (metadata.HasTag ('data ignore value')) THEN BEGIN metadata.UpdateItem, 'data ignore value', 0. ...
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by  MariMJump to last post
20 Apr 2018 12:26 PM
1 Replies and 1528 Views Harris Support Request Webpage is balnk  1528  1 Started by  Wayne Rigby The link http://www.harrisgeospatial.com/Support/tabid/2283/ctl/Edit/mid/MyAccount/NewSupportIncident.aspx doesn't do anything currently (from Chrome or Internet Explorer). I'd like to report an IDL bug, but I can't contact you. --Wayne
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by  MariMJump to last post
02 Apr 2018 11:01 AM
0 Replies and 22149 Views Water band removal error for HSI image at time of FLAAST process  22149  0 Started by  Jay Mishra FLASH shows the error when the Water removal option is activated, I have changed the tile value from the 100 to 2000 MB, but not change of error. It is requested to kindly help me. Error Message: https://drive.google.com/file/d/1jINQ4QSQqqXr-ZV5LbbLrd0zWak78-PX/viewusp=sharing
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21 Feb 2018 12:29 PM
2 Replies and 2575 Views Linear Spectral Unmixing (LSU)  2575  2 Started by  Bisma Qazi Hi, How do we decide the weight in case of LSU I am getting values >1 and < 0 in the output images even after applying the sum constraint and setting the weight to default value (1)
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by  Bisma QaziJump to last post
13 Dec 2017 05:10 AM
10 Replies and 3615 Views LAI inbuilt spectral indices tool limitations  3615  10 Started by  Yahampath Marambe I am using ENVI to produce LAI map series. ENVI use the following equation to calculate LAI. (Eq1) - LAI= (3.618*EVI) - 0.118 However, the value range of EVI is -1 to 1. Then the maximum value of LAI should be 3.50 according to the equation if EVI reaches to its maximum. Typically, ENVI gives LAI values greater than that value (3.50) also. Is ENVI using a higher upper limit for EVI than the typical range (-1 to 1) This equation also gives negative values for the LAI. I wo...
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by  MariMJump to last post
06 Dec 2017 03:14 PM
5 Replies and 3798 Views IDL batch export to tiff from problematic hdf files  3798  5 Started by  PBreeze123 I have a large number of (nearly a thousand) rasters in .hdf (hdf4) format from the GLASS albedo product. Unfortunately there is a problem with the projection information/header data which means ARCGIS, GDAL, QGIS, SAGA, and GRASS all seem to have problems with the data/will not recognise the projection. This problem has been acknowledged by the product support team as a known issue, but will not be resolved until the next release, until which time they suggest manually editing the headers (see ...
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by  MariMJump to last post
23 Jun 2017 08:44 AM
2 Replies and 2677 Views Use of classification classes in ENVI Band Math  2677  2 Started by  nadia akdim Hi, I have produced a crop map, and I need to calculate a number of biophysical variables using specific equations for specific crop class . I did it before using Matlab. But how can I do that using ENVI-Band math Thanks
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by  josh edwardsJump to last post
21 Jun 2017 03:59 AM
1 Replies and 3063 Views colsort.pro  3063  1 Started by  Jade Williams On your blog page http://www.harrisgeospatial.com/Company/PressRoom/Blogs/IDLDataPointDetail/TabId/902/ArtMID/2926/ArticleID/13072/A-column-sort-routine.aspx you reference a column sort routine, and give a link to download it at: ftp://download.exelisvis.com/groups/esg/blog/colsort.pro I am unable to access the site. Help please!
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by  MariMJump to last post
17 Apr 2017 11:20 AM
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