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1 Replies and 15 Views Mathematical operation in Raster stack  15  1 Started by  Rajeev Bhattarai Hi, I have a raster stack of 15 rasters and another stack of the same number of raster layers. Now I want to subtract one layer from another from two stacks. How can I do that quickly ENVI allows me to do calculations only in a single band basis. Is there any way to do operations in a stack quickly Thanks in advance.
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by  Mari MinariJump to last post
18 Apr 2019 10:08 AM
6 Replies and 290 Views EO-1 Hyperion Orthorectification  290  6 Started by  telepinu Hello, I am want to Orthorectify Hyperion images, what is the best way of doing so Hyperion sensor is not defined in ENVI. Best Regards Mustafa
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by  Mari MinariJump to last post
09 Apr 2019 07:58 AM
5 Replies and 564 Views QUAC  564  5 Started by  Itiya Aneece *sorry if this is a duplicate post. I didn't see a confirmation that the other was submitted successfully, so am posting again. I'm trying to run QUAC on a Hyperion image but keep getting the error "QUAC correction failed. Unable to extract the endmembers from input raster. Try a different sensor option or apply a mask." I tried this choosing Hyperion and choosing Generic/ unknown sensor. When I run it on a radiometrically corrected image, it says "QUAC correction failed. Max...
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by  Mari MinariJump to last post
01 Apr 2019 10:38 AM
2 Replies and 19 Views NDVI and Band math  19  2 Started by  Janine Van Der Linden Hello all, I have 2 images of the same are taken before and after a natural disaster. I converted them to NDVI images and now I want to see the differences between the 2 NDVI images to see where and how much changes occurred. I know I need to use band math, but not sure how to do it. Can anyone help Thank you
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by  Janine Van Der LindenJump to last post
01 Apr 2019 09:19 AM
1 Replies and 28 Views Extending ENVI with IDL - read .hsi and .hdr files  28  1 Started by  Princess Dantes Hi, I have .hsi and .hdr files (hyperspectral images) which I can open and process in ENVI. I tried using IDL and extend ENVI but these files would not be read. Please help me what codes or procedures to perform to achieve this first task. Thanks, Tiffany
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by  Mari MinariJump to last post
01 Apr 2019 07:23 AM
27 Replies and 1089 Views Hyperion Preprocessing  1089  27 Started by  Salaj
(Topic has multiple pages1 2 )
Can the Vertical stripe removal in the SPEAR tools of ENVI 4.7 be used for hyperion preprocessing and if yes kindly do send me details on how this tool works as the information about this tool is not sufficient in ENVI help.Expecting a reply soon.
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by  Mari MinariJump to last post
28 Mar 2019 02:35 PM
4 Replies and 65 Views converting SPECPR file formats in to ENVI readable spectral library files  65  4 Started by  kalani lakshani The SPECPR files available with USGS spectra files are readable using the plugins which are tested with envi. specially envi 4.5 and 4.8. how ever is it possible to convert the full spectrum of specpr file in to a spectral library format in envi when converting the SPECPR file in to ascii format and generating the spectral library it is giving an error message of not containing the full spectra of the SPECPR file. I used envi 4.5 and i used a plugin type function compatible with ENVI which faci...
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by  Mari MinariJump to last post
20 Mar 2019 05:22 AM
2 Replies and 53 Views ASTER bands 4-5-6, too high negative values  53  2 Started by  joseph kafka After Radiometric Correction -> FLAASH Atmospheric Correction, ASTER L1T bands 4 - 5 - 6 has too high negative values. I've used 'Aerosol model, Aerosol Retrieval - None' as the area is a terrain region. Is it normal to get such high negative values Basic Min Max Mean Stdev Band 1 -686 4696 485.896568 400.115968 Band 2 -263 5461 580.587626 504.316090 Band 3 -639 6975 1484.227743 1133.655309 Band 4 -706 144 -141.317726 123.1...
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by  joseph kafkaJump to last post
15 Mar 2019 06:51 PM
1 Replies and 52 Views Shadow to Height tool  52  1 Started by  Santanu Dutta Please suggest shadow to height tool is available in latest version If yes.. Please share the link..
1 52
by  Mari MinariJump to last post
13 Mar 2019 10:17 AM
8 Replies and 150 Views Hyperspectral radiance to reflectance with calibration panel  150  8 Started by  Colin Axel How can I convert radiance hyperspectral images to reflectance using a calibration panel in the scene with a known reflectance
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by  Mari MinariJump to last post
12 Mar 2019 07:31 AM
4 Replies and 71 Views INVI Data Series  71  4 Started by  fatma tarek How can I convert data series (for 400 tifs) to individual tifs in INVI 5.3
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by  fatma tarekJump to last post
11 Mar 2019 01:01 PM
3 Replies and 71 Views Converting L8 OLI Thermal bands to surface reflectance  71  3 Started by  joseph kafka Hi, I would like to convert a Level 1c Landsat 8 OLI product to surface reflectance like that of the multispectral bands. Do i have to follow the same procedure of Level 1C bands -> Radiometric calibration -> FLAASH or is there intermediate steps that has to be included for thermal bands
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by  Mari MinariJump to last post
11 Mar 2019 05:51 AM
1 Replies and 80 Views Saving displayed image  80  1 Started by  Tae-Sung Shin As using ENVI 5.3 (non-classic), I couldn’t find a way to save displayed image (RGB) of a hyperspectral cube with some annotations to an image file with same size but without margins. I can use “Chip to file” menu item to save it into a tif file. But the saved image has different size and white margins in all sides. Thus, my question is: How to save displayed image to original size without the margins
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by  Mari MinariJump to last post
01 Mar 2019 05:15 AM
0 Replies and 34 Views Normalizing a single band of landsat 8 imagery w.r.t an adjacent one  34  0 Started by  joseph kafka Hi We have 23 landsat 8 level 2 imageries which has to be mosaiced. Based on date, we have mosaiced individual bands (B1, B2, B3, B4, B5, B6) and now it's down to 5 imageries. But we are not getting a seamless mosaic as the there is one month difference between the five imageries. Is it possible to 'normalize' the values of one image w.r.t another one. Of course, vegetation plays a huge role in this process. But can't we match terrain and soil ( 100 is not possible) as seamless as possible ...
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28 Feb 2019 06:20 PM
1 Replies and 41 Views Neural net with saved spectral library input  41  1 Started by  sofia Hi, I have a selection of spectral dataset that I want to split for neural net training and testing. I can collect a combined subset of spectral library from each dataset and plan to use those spectral library to other dataset using neural network classification, But for now, the only I see for neural net import is either .roi or .evf and can be imported from the same dataset. Is there a way to use spectral library in .txt or .ascii from other dataset for the neural net Thanks for your h...
1 41
by  Mari MinariJump to last post
28 Feb 2019 10:58 AM
1 Replies and 60 Views First derivative conversion for hyperspectral data  60  1 Started by  Yongsik Jeong How to directly get First Derivative band images from hyperspectral reflectance band images (0 to 288 bands) using ENVI software or band math 1. I have the stacked reflectance 288 bands in a .dat file. 2. I want to know how to convert reflectance spectral bands to first derivative reflectance spectral bands by using mathmatical matrix to obtain spectral derivative value in ENVI. If you can provide band math equations or IDL code, it would be really greatful. Thanks in advance and c...
1 60
by  Mari MinariJump to last post
28 Feb 2019 08:52 AM
11 Replies and 197 Views Linear Percent Stretch Raster API might be broken  197  11 Started by  Dulci Avouris Hello! I had an algorithm that used the ENVILinearPercentStretchRaster function to stretch my image for display. It worked, overall, but since the upgrade, the code no longer produces an image where the no-data pixels are excluded from the color stretch. I have a 4- band image, where I want to do a 2 linear stretch on each band individually, and then change the color table to rainbow, and export the colored image as a geoTIFF. I have two options here. I have two four-band images, one whe...
11 197
by  Mari MinariJump to last post
20 Feb 2019 11:37 AM
10 Replies and 29353 Views Free ENVI 5.3 download  29353  10 Started by  Vy Nguyen I've already created an account to download previous ENVI and IDL versions. But I got message that my access is denied due to verification pending process. So I have to wait up to 24 working hour and later on I can download previous version for free. Please reconfirm if I misunderstood any information! Thank you so much!
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by  Mari MinariJump to last post
19 Feb 2019 05:05 AM
6 Replies and 209 Views F masking  209  6 Started by  Rajeev Bhattarai According to the tutorial provided by 'https://www.harrisgeospatial.com/docs/CalculateCloudMaskUsingFmask.html' I created a cloud mask for Sentinel 2 imagery, but while I tried to apply the mask the mask only gets applied to 10 m bundle of the image while denies for 20 and 60m bundles. Can anyone please help me on this or do anyone have a better idea to mask out clouds Thanks in advance.
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by  Mari MinariJump to last post
24 Jan 2019 01:36 PM
2 Replies and 118 Views Import Metadata for Corrections  118  2 Started by  Jose Manuel Lattus Hello! For many issues we need to perform numerous correction to images, for some of them ENVI need the original metadata of the files, but this metadata is lost when you process. A simply 2 pre-processing are for example: Orthorectification and Radiometric Calibration. When you orthorectify you can't use Radiometric Calibration Tool When you calibrate you can't use orthorectification tool (RPC less) So I othorectify the image, then I import metadata (Gain and Offset, Sensor, Solar issues...
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by  Jose Manuel LattusJump to last post
16 Jan 2019 03:27 PM
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