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4 Replies and 1938 Views
Landsat Collection 2 Level 1 ENVI 5.6.1 1938 4
Started by Deleted User
Hello! I'm trying to open a Landsat 9 Collection 2 level 1 in ENVI 5.6.1 and ENVI do not recognize! I try with the MTL.txt file and the xml file I download from earthexplorer site: LC09_L1TP_233079_20220328_20220328_02_T1 please help me! JM Lattus
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by Deleted User 31 Mar 2022 06:40 AM |
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2 Replies and 1483 Views
ROI with masked pixels but no existing mask 1483 2
Started by Deleted User
I would like to understand better the 'Mask Count' variables under the ROI Statistics tool. I am working with hyperspectral satellite images to which I didn't personally apply any mask. Nevertheless, when I design some ROI and ask ENVI 5.6 (or IDL 8.8 for what matters) to compute the ROI statistics, those are computed only on a subset of the ROI pixels. For example I have a ROI with 11 pixels of which only 1 is used to compute the statistics (and, therefore, no standard deviation) and 10 ...
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by Deleted User25 Feb 2022 10:48 AM |
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0 Replies and 1333 Views
AST 09XT Preprocessing Steps 1333 0
Started by Deleted User
Hello forum. I am trying to pre-process 09XT data of ASTER but I think it was different from L1B data processing When I trying to change RPC situation from ENVI header (RPC or RSM) it gives error and wanting to be imported RPC coefficient containing file I am thinking first I have to start orthorectification later then start preprocessing steps but I don't know how to apply orthorectification to the 09XT data do you help me
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1333 |
30 Jan 2022 08:00 AM |
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0 Replies and 1469 Views
Confusion matrix bug 1469 0
Started by Deleted User
Hi, I have a classification map with three classes. I have also a ground truth dataset provided by ROI tools. The numbers of ground truths (pixels) for classes are 870, 1007, and 695. However, when making the confusion matrix to evaluate the classification, it shows different numbers as the ground truth per class i.e. 598, 887, 695. Just for the third class, it is the same. I do not understand the difference. Why is the total number of pixels of ground truth in the confusion matrix per...
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1469 |
01 Dec 2021 03:28 AM |
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1 Replies and 1012 Views
ISODATA Classification 1012 1
Started by Deleted User
Dear all, I am trying to do some unsupervised classification on hyperspectral images using the ISODATA tool. However, I find some unclarity between the GUI options and the ENVI help. ISODATA requires to specify thresholds about standard deviation of the data ('Maximum class Stdv') and the help states that this standard deviation should be expressed in 'DN' (which I guess means 'Digital Number'). But what does it means exactly I am working on scaled reflectance images, how should I convert...
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by MariM29 Nov 2021 11:00 AM |
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3 Replies and 1152 Views
Seamless mosaicking hanging without errors 1152 3
Started by Deleted User
I'm trying to run a seamless mosaicking procedure on a relatively big dataset (25 images, 186 bands per image, roughly 1400*6100 pixels per image). The procedure starts correctly, the progress bar fills completely, but the process never finishes. Even if the progress bar is completely filled, the GUI still shows 'Exporting results' but the mosaic files seems untouched since many hours from the beginning of the procedure: I've started the mosaic yesterday at roughly 8 PM, now it's 1 PM the day...
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by MariM29 Nov 2021 07:50 AM |
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1 Replies and 1035 Views
Calling FLAASH via IDL 1035 1
Started by Deleted User
Hi, I need to do atmospheric correction on more than 2,000 hyperspectral images, which means batch processing. I would like to use FLAASH, as after testing on several images QUAC and FLAASH led to rather different results. I saw that there is no API specifically designed to call FLAASH, but is it only possible to use it through the GUI or may there be other options Thank you
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1035 |
by MariM19 Nov 2021 06:13 AM |
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15 Replies and 88264 Views
Free ENVI 5.3 download 88264 15
Started by Deleted User
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 MariM28 Oct 2021 08:32 AM |
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1 Replies and 1050 Views
ENVIPixelScaleResampleRasterTask 1050 1
Started by Deleted User
I'm running ENVI 5.5.3 (with IDL 8.7.3). I don't think it matters, but I'm on a MacBook Pro running MacOSX 10.14.6. (I've checked an IDL 8.8/ENVI 5.6 that we have and it appears identical.) I've noticed that through the GUI, using Resize Data, when reducing the number of pixels (i.e., making them cover larger physical space on the ground), there is an option that allows pixel aggregation. However, in what seems to be the most closely related task (ENVIPixelScaleResampleRasterTask), the RES...
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by MariM22 Oct 2021 06:28 AM |
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3 Replies and 1235 Views
Radiometric Correction 1235 3
Started by Deleted User
Hello! Sometimes when i get images with Radiometric Correction Applied, this tool (Radiometric Calibration) allow me to do this correction, so this could be a double radiometric calibration. Anyway sometimes I test applying radiometric calibration and then atmospheric correction, or just applying atmospheric correctiom and the result is the same, for example for AST_L1T, or WorldView2 radiance images. If the image is in level: 'Radiance at Sensor' and I apply a Radiometric Calibration, what ...
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by MariM21 Oct 2021 10:38 AM |
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1 Replies and 1132 Views
Average NDVI Per Land Cover Class 1132 1
Started by Deleted User
Hi! I'm currently working on a project assessing the reduction in NDVI following a hurricane. I've created pre and post hurricane NDVI images, and have also undertaken a supervised land cover classification of the Landsat 8 imagery. I was wondering if anyone knew how I might go about calculating the average NDVI value per land cover class, so that I can quantify the difference. I would truly appreciate some ideas. Thanks!
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1132 |
by MariM01 Oct 2021 09:57 AM |
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0 Replies and 1304 Views
ROI with masked pixels but no existing mask 1304 0
Started by Deleted User
I would like to better understand the 'Mask Count' variable in the ROI Statistics tool. I'm working with hyperspectral images to which I personally haven't applied any specific masking. Nevertheless, when I create some ROIs and inspect them with the ROI statistics tool (either in ENVI or IDL) statistics are computed on a subset of the ROI pixels (e.g.: the total number of pixels in the ROI is 11 of which only 1 is used to compute the statistics, and therefore the standard deviation is 0, and ...
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1304 |
30 Sep 2021 09:52 AM |
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0 Replies and 1302 Views
Calculating total sediment load from Sentinel-3 OL_2_WFR TSM_NN band 1302 0
Started by Deleted User
Hi, I did try to calculate the sediment load in a coastal region from the Sentinel-3 OL_2_WFR TSM_NN band in SNAP but could not find a way to do it. I was wondering if there might be a (simple) way to do this in ENVI, e.g. by using pixel statistcs This is a task in beginners remote sensing course - so there must be a (relatively) simple way but I can not find any tutorial whatsoever explaining how to do it - is there maybe anyone who could help Any help very much appreciated!
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1302 |
28 Sep 2021 04:37 PM |
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0 Replies and 1782 Views
Dice raster by vector question 1782 0
Started by Deleted User
I'm trying to tile out a hyperspectral mosaic using the Dice Raster by Vector function, but I want to use an attribute field from the vector .dbf to name each corresponding tile. I don't see this option anywhere. Does anyone know of a solution
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1782 |
21 Sep 2021 08:02 AM |
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4 Replies and 5153 Views
input raster must have valid wavelength metadata 5153 4
Started by Deleted User
I have a demo version in Envi 5.5 and i use a module 'crop science' When i import a multispectral image works well but this is not happen when i import pan- sharpened image and try to calculate spectral indices . i takes this messagethat 'input raster must have valid wavelength metadata' How can i fix it The second question is when i import a UAV image from ebee, i have many troubles in pre - processing image ( radiometric and atmospheric correction . Can we help me i appreciate your help ...
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by MariM21 Sep 2021 07:39 AM |
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2 Replies and 2206 Views
Landsat Collection 2 2206 2
Started by Deleted User
Hello, I was trying to load the new Landsat Collection 2 data in ENVI using the mtl file (downloaded from earthexplorer.usgs.gov) but was unsuccessful (ENVI error message 'unable to recognize this file as a standard format'). I did notice that besides the 'normal' bands, Collection 2 also include additional bands such as 'cloud distance', 'upwelling and downwelling radiance'. I didn't have any issue opening Collection 1 data (downloaded from glovis.usgs.gov), which has the bands only and the mtl...
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2206 |
by Deleted User10 Sep 2021 10:23 AM |
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4 Replies and 1323 Views
FLAASH Advanced Settings 1323 4
Started by Deleted User
Hello! I'm running FLAASH for a Geoeye Image, but I haver negative values in the result. 1. I run with default adavanced Settings 2. Sun Azimuth is 87 in the metadata / Nadir is 18.2 3. I run using Zenith = -93 and Nadir = 180 - 18.2 = 161.8 --> I have negative values always 4. I run using Zenith= -87 and Nadir = 161.8 --> negative values always (anyway higher values than with Zenith -93) any recomendation thanks JM Lattus
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by Deleted User27 Aug 2021 03:29 PM |
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1 Replies and 1288 Views
ENVI advice 1288 1
Started by Deleted User
I am trying to map the change over time of a marine sponge. I have 1000s of RGB images. I was trying to classify -sponge and not sponge within an ROI - a small rectangle around the sponge. my thoughts are supervised image classification but I'm having trouble with classification part. And then I need to apply this classification on all the images (within only the ROI around the sponge)....I'm having some trouble with what tools I should apply to this problem. It's just been a few years since I'v...
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by Deleted User20 Aug 2021 02:55 AM |
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1 Replies and 1403 Views
NVIDIA CUDA Library on AMD Graphicscard 1403 1
Started by Deleted User
I am trying the Deep Learning Tools for the first time and I have noticed while testing the installation and configuration, that the NVIDIA CUDA Library is not installed. I it possible to install the Libary while not having a NVIDIA Graphics card, or is there an alternative for AMD Raedon Thank you in advance, Robert
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1403 |
by MariM07 Jul 2021 10:21 AM |
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1 Replies and 1234 Views
LANDSAT compatibility with ENVI Classic 1234 1
Started by Deleted User
Hi, Does anyone know if there is a workflow to load LANDSAT data products (L1 and L2SP) into ENVI Classic It seems that the TIFF file compression that USGS started using recently is not supported in ENVI Classic (I am running v5.6), but seems to load fine in the Normal ENVI interface. Thanks, Michael
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by MariM06 Jul 2021 07:15 AM |