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by MariM 20 Jul 2017 08:57 AM |
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5 Replies and 2773 Views
Applying SAM, SVM and MLC to PCA 2773 5
Started by Deleted User
Hi, I intend to apply the Spectral Angle Mapper (SAM), Maximum Likelihood (MLC) and Support Vector Machine (SVM) algorithms on a hyperspectral dataset but would just like to clarify the steps required. I have performed radiometric correction and a forward PCA rotation which resulted in 3 PCA bands. However, I am slightly confused regarding endmember selection procedures when using PCA. For example, for the MLC algorithm I understand that if I wasnt using PCA I would simply create new ROIs to...
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by Deleted User16 Jul 2017 02:21 PM |
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9 Replies and 3908 Views
Hyperion L1GST Radiancen Gain Values 3908 9
Started by Deleted User
Hi, I'm following the EO-1 Hyperion Vegetation Analysis Tutorial to remove bad bands and convert radiance to reflectance. However, the radiance gain values are slightly different to those in the tutorial. For example, Bands 1 - 70 in the tutorial all have radiance gain values of 0.025. However, in my case the values for Bands 1 - 70 alternate between 0.0125 and 0.025 e.g Band 1 value = 0.0125, Band 2 = 0.025, Band 3 = 0.0125, Band 4 = 0.025. Is this normal If not does anyone know a reaso...
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by MariM11 Jul 2017 06:54 AM |
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5 Replies and 3027 Views
user defined projections in ENVI 5.4/IDL 8.6 3027 5
Started by Deleted User
I have user defined objects in three files - datum.txt, geogcs.txt, and spheroid.txt - that I've put in envi54/idl86/resource/pedata/user_defined and IDL 8.6/ENVI 5.4 do no see them. They don't show up with map_pe_get_option_table, and are they're not available when I try to do projections. These same files worked when placed in similar directories in IDL 8.4-8.5 and ENVI 5.2-5.3. Did the mechanism for user defining objects change Frank
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3027 |
by MariM26 Jun 2017 02:55 PM |
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3 Replies and 2045 Views
Can I perform FLAASH correction on airborne SASI hyperspectral images 2045 3
Started by Deleted User
Hi, I have collected airborne hyperspectral SASI images (950 nm ~ 2450nm), and want to convert the raidance to reflectence by performing FLAASH. However, when I perform FLAASH atmosphere correction module in ENVI, it shows the following error 'ACC_AVHEAD: Error -- some channels found outside 100 to 30000 cm-1'. So I want to know can I use FLAASH module to perform an atmospheric correction on SASI images If I cannot directly perform, can I 'join' CASI and SASI spectra and choose the sensor type ...
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by MariM23 Jun 2017 06:04 AM |
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2 Replies and 2019 Views
Writing ENVI Raster from ENVI Task 2019 2
Started by Deleted User
Hi all, I'm trying to write a foreach loop to convert all bands in an existing ENVI Raster into output PNGs. When I run the following loop: 'foreach i, bandGet do begin Subset = ENVISubsetRaster(raster, bands=&91;i&93;) print, (baseName bNames&91;i&93;) ; Creating the PNG routine from ENVI Docs Task = ENVITask('ExportRasterToPNG') Task.INPUT_RASTER = Subset Task.OUTPUT_RASTER_URI = (baseName bNames&91;i&93;) Task.Execute Task.output_raster ...
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by Deleted User12 Jun 2017 03:25 PM |
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3 Replies and 2505 Views
background pixels in classification 2505 3
Started by Deleted User
Hi,
I want to classify SPOT 7 multispectral image in ENVI 5.1.
After I created subset image of my study area using ROI, background data (the pixel values outside of the ROI data) occurred. Background data has zero pixel value.
In order to mask background pixels, I created ROI from band thresholds and chose thresholds parameters for all bands as min value=0; max values=0 and then saved ROI to .xml.
I selected the subset image as classification input file. I imported "mask ROIs xml"...
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by MariM12 Jun 2017 08:51 AM |
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1 Replies and 2280 Views
Atmospheric correction in ENVI, export to ERDAS 2280 1
Started by Deleted User
I am working on a project using Hyperspectral imagery and have ERDAS Imagine on my home PC and have access to ENVI on another PC at University. Is it possible, for example, to perform the atmospheric correction in ENVI, then import it into ERDAS, and then perform Principal Component Analysis, Minimum Noise Transformation (MNF), supervised classification etc The file is a .l1r file from EO-1 Hyperion downloaded from GloVis. I read here (https://gis.stackexchange.com/questions/91021/imagine-fi...
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2280 |
by MariM12 Jun 2017 05:46 AM |
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1 Replies and 2433 Views
Deep Learning 2433 1
Started by Deleted User
Hi all, i am looking for a deep learning classification solutions in order to extract features and classification from VHR (0.50 and 0.30 meters) multispectral images. Can someone suggest a link to IDL/ENVI based solutions for deel learning Thank, Lorenzo
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2433 |
by MariM01 Jun 2017 11:47 AM |
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1 Replies and 1977 Views
error matrix for unsupervised classification 1977 1
Started by Deleted User
Hi, I work on a diachronic map of vegetation, I use RGB NDVI technique , this technique is based on the use of three ndvi taken in three different dates to quantify the change of the green biomass through the three dates (in my case : 1984, 2001, 2011), In this technique a non-supervised classification was used to quantify the changes. Currently, I find a problem to produce the matrix of confusion, When I read in the literature authors says that the matrix of confusion is done on the basis of ...
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by MariM01 Jun 2017 11:40 AM |
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4 Replies and 3512 Views
FLAASH Error while Processing GeoEye-1 Image 3512 4
Started by Deleted User
While running FLAASH on a 4-band GeoEye-1 image, I receive the following error: 'Problem: The FLAASH program exited with the following errors: ACC error: avrd: IDL error: Illegal subscript range: FIMAGE. ACC_AVRD <( 9)> ACC_HYPER2 <( 524)> ACC_ACC <( 191)> ENVI_ACC_EVENT <(3179)> ENVI_FLAASH_PROCESS_MANAGER <( 581)> $MAIN$ <( 0)>' FLAASH is running properly on 8-band WorldView-2 images. What might be causing this error
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by Deleted User19 May 2017 07:17 AM |
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4 Replies and 3192 Views
Linear 2 Stretch for color display 3192 4
Started by Deleted User
Hello! I am wondering if the linear stretch function has changed between ENVI 5.3.1 and 5.4. The exact same image is displayed differently using the default 2 linear stretch. I think the calculation of the 2 & 98 edges of the histogram is not correct in 5.4. Is this a known issue When I use the histogram stretch tool in 5.4 the 2 linear stretch edge lines are actually at something like 6-7 & 99.98. I can manually move those lines to the correct positions (2, 98) and match the color dis...
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3192 |
by Deleted User17 May 2017 12:00 PM |
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1 Replies and 2148 Views
ENVI classic interface on Linux 2148 1
Started by Deleted User
Hi all, I was wondering if there is any way to change/improve the 'appearance' of the ENVI classic GUI on Linux. Not a big deal, but it is a bit old-style and ugly, and the file browser is really cumbersome to use (at least on my system - KUBUNTU 16.10 - unfortunately I cannot post an image to show that). It's not a big deal, but I'd appreciate any suggestions. regards, Lorenzo
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2148 |
by MariM17 May 2017 09:20 AM |
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1 Replies and 2044 Views
Using Toolbox Tools Via Command Line 2044 1
Started by Deleted User
Is it possible to run the toolbox tools through a command line I am interested in using the 'Photographic Stretch' tool on serveral GeoTiff image products. I would like to write a shell or python script that would be able to execute a command to call the 'Photographic Stretch' tool on these images. Thank you.
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by MariM16 May 2017 12:00 PM |
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5 Replies and 12395 Views
How can I open Sentinel 2A image using ENVI 5.3 12395 5
Started by Deleted User
Hello,
I have downloaded Sentinel data from the scihub.copernicus website and I would like to open the ortho image with ENVI 5.3. In File>Open external file, I don't have the Sentinal-2A menu option. I can open the jpeg2000 file located in the "granule" directory from the File>Open image file menu option but it opens the image without any georeferencing. How can I open the image with the georeferencing
Thank you in advance for your help.
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by MariM16 May 2017 11:19 AM |
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0 Replies and 4845 Views
ENVI Crop Science 1.0 release 4845 0
Started by Deleted User
I am excited to announce that ENVI Crop Science 1.0 is now available. This new product provides remote sensing analytics for precision agriculture and agronomy. It is designed to work with satellite, aerial, and UAV imagery in both a desktop and enterprise environment. Functionality includes: crop counting, crop metrics (crop health), and hotspot analysis. For more information please visit http://www.harrisgeospatial.com/ProductsandTechnology/Software/ENVI.aspxprecisionag. Please contact yo...
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12 May 2017 02:10 PM |
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1 Replies and 1937 Views
ENVIPointCloudViewer not supported on linux 1937 1
Started by Deleted User
Hello, I am running Ubuntu 16.04 and ENVI 5.4. I installed ENVI yesterday. I tried to open a .las file and I get an error 'ENVIPointCloudViewer not supported on linux' Additionally, I am unable to copy a file path (or anything) into the directory path window at the open file GUI - not sure if that is a bug or if that is the excepted functionality. Thanks for any help. John
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1937 |
by Deleted User09 May 2017 07:21 AM |
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2 Replies and 2792 Views
ASTER L1T FLAASH Error 2792 2
Started by Deleted User
Hi, FLAASH module is throwing error, when I want to do atmospheric correction on VNIR and SWIR bands of ASTER L1T . The error is 'Input image has more bands (9) than expected for the selected sensor (14). Please check the sensor type or set to UNKNOWN-MSI if using a custom filter function'. What can be the cause for the error Thanks.
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2792 |
by Deleted User02 May 2017 11:57 PM |
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6 Replies and 3274 Views
FLAASH 3274 6
Started by Deleted User
When I tried to using ENVI FLAASH to do the atmospheric correction for MISR data over water, it reminded me to input the 'filter Function File' in Multispectral Settings. After I input the sensor spectral response file, it reminded me the error of 'Attempt to subscript FF_WL with is out of range'. Is this because the MISR sensor has limited bands, as it only has four bands of 446, 558, 672 and 866nm Thanks!
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3274 |
by Deleted User01 May 2017 10:24 AM |
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1 Replies and 1999 Views
Help Intalling ENVI 5.3 1999 1
Started by Deleted User
Hello All,
Can someone help me with steps to install ENVI 5.3 on a Linux ( red hat 6.x ) virtual machine( command line) please . I have Extracted the tar file but I can see so many files and I have no idea which ones I should copy to my server and start the installation. Thanks in advance
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by Deleted User29 Apr 2017 10:19 AM |