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1 Replies and 1116 Views
Launching ROI tool from script 1116 1
Started by Deleted User
I have written a program that creates rois (using envi_create_roi) that I may (or may not) want to display in my image group. However these rois do not display without me remembering to have the roi tool already open (which I sometimes forget to launch because I use this program somewhat infrequently).
Anyway, is there a way that I can automatically open and close the roi tool for a display group from a script
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1 |
1116 |
27 Aug 2007 10:03 AM |
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1 Replies and 1562 Views
Principal Components analysis/factor loadings 1562 1
Started by Deleted User
Hi there--
I'm learning my way around ENVI (and remote sensing in general)...
I've run a PCA analysis on all 12 bands of an ASTER image. I'm trying to figure out how to interpret the stats file--I get a covariance matrix, a correlation matrix, eigenvalues, and the other data I expect to find. However, in all the matrices, both the rows and the columns are labeled Band 1-12. I can't tell which one pertains to the original bands, and which pertains to the PC's.
Usually, I see cell he...
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1 |
1562 |
21 Aug 2007 03:32 PM |
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1 Replies and 1242 Views
Sensor line in building RPCs 1242 1
Started by Deleted User
In the ENVI help for 'Building RPCs', the diagram for the line central projection method shows the flight direction perpendicular to the scan lines. By selected X or Y for the 'Sensor line along axis' option, can you make the program work with a flight line that is parallel to the scan line (as for CORONA satellite images) Or does the program always assume the flight line and scan lines are perpendicular
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1 |
1242 |
21 Aug 2007 11:05 AM |
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1 Replies and 1152 Views
Vegetation Analysis/Vegetation Index Calculator 1152 1
Started by Deleted User
I am a new ENVI user. I have used the NDVI and Tasseled Cap vegetation indices that are built into the ENVI program on my images and everything worked fine. I want to use a few more, but when I tried using the vegetation index calculator on my images an error message kept coming up. The error message says 'wavelengths must be defined to calculate vegetation indices.' I am not sure what I am supposed to do to get the vegetation index calculator to work.
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1 |
1152 |
20 Aug 2007 08:31 PM |
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1 Replies and 1121 Views
Histograms and Supervised Classifications 1121 1
Started by Deleted User
Hi--I'm new to ENVI--using it in an archaeological context. Here's my question--I have some ROI's defined for a river delta. I also have a survey area that takes up a small part of the river delta--but since the survey area is unexplored, there are no ROI's from that area. I tried using an Endmember classification with some interesting results. The endmember spectra were just imported from the ROI's for the original image. But can I do this, or do I need to match the historgrams first Wil...
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1 |
1121 |
20 Aug 2007 03:50 PM |
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0 Replies and 1197 Views
The definition of the envi-standard header file 1197 0
Started by Deleted User
Dear sir/madam:
My name is Michal. I have a question to ask! How can I get the definition of the envi-standard header file for reading the data£¿Just like a document to help me to know that the significance that parameter represent!
Please help me .I will very appreciate it if I can gain your reply as soon as possible!
yours truely
Michal Gr...
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0 |
1197 |
17 Aug 2007 11:49 PM |
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1 Replies and 1179 Views
Convert Map Projection Error - Rigorous 1179 1
Started by Deleted User
I'm trying to convert a map projection of a very large (i.e., 61000 by 17000 pixels) image using ENVI 4.3's 'Rigorous' conversion parameter. I get an error when trying to convert the full image but not when I do a smaller subset.
The error is: 'array dimensions must be greater than 0.'. Any thoughts or suggestions
Thanks
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1 |
1179 |
17 Aug 2007 08:30 PM |
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0 Replies and 1093 Views
empirical line 1093 0
Started by Deleted User
Hi Everybody,
I am trying to get reflectance value from Aster L1B data (VNIR ans SWIR bands). I wanted to use empirical line method from ENVI 4.3. I tried to process but at the end of the process I lost my band 9. At beginning I have 9 bands after application my band 9 become completly dark. Do you know what is the reason of this
thank you,
Filiz
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0 |
1093 |
16 Aug 2007 08:40 AM |
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1 Replies and 1487 Views
empirical line 1487 1
Started by Deleted User
Hi Everybody,
I am trying to get reflectance value from Aster L1B data (VNIR ans SWIR bands). I wanted to use empirical line method from ENVI 4.3. I tried to process but at the end of the process I lost my band 9. At beginning I have 9 bands after application my band 9 become completly dark. Do you know what is the reason of this
thank you,
Filiz
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1 |
1487 |
16 Aug 2007 08:40 AM |
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0 Replies and 1083 Views
The definition of the envi-standard images 1083 0
Started by Deleted User
Dear sir/madam:
My name is Michal. I have a question to ask! How can I get the definition of the envi-standard images for reading the data£¿Just like a document to help me to know that the significance that data represent!
Please help me .I will very appreciate it if I can gain your reply as soon as possible!
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0 |
1083 |
15 Aug 2007 08:30 PM |
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0 Replies and 1162 Views
Altering multiple ROIs 1162 0
Started by Deleted User
Hi
Anyone know how I can change the details of multple ROI's at the same time I want to change the name and colour of multiple ROI's at the same time to the same vasue. It would be great to be able to change them in a text editor, or to import from a text file to multiple ROIs.
Cheers.
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0 |
1162 |
14 Aug 2007 05:22 PM |
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2 Replies and 1081 Views
Altering multiple ROIs 1081 2
Started by Deleted User
Hi
Anyone know how I can change the details of multple ROI's at the same time I want to change the name and colour of multiple ROI's at the same time to the same vasue. It would be great to be able to change them in a text editor, or to import from a text file to multiple ROIs.
Cheers.
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2 |
1081 |
14 Aug 2007 05:22 PM |
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0 Replies and 1142 Views
estimate SNR? 1142 0
Started by Deleted User
Hi folks,
I've seen papers where the SNR for a scene has been estimated for a scene using the data itself. These papers have brief discussions of how they did it, but it didn't quite make sense to me. Can anyone give a fairly complete outline of how this is done
Jeff
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0 |
1142 |
09 Aug 2007 02:07 PM |
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0 Replies and 1038 Views
without cloudy 1038 0
Started by Deleted User
If somebody knows how to elimanate image's cloudy.
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0 |
1038 |
06 Aug 2007 08:49 AM |
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1 Replies and 1371 Views
ENVI Spectral Math Question 1371 1
Started by Deleted User
Is there a way to subtract a spectrum from every pixel in an image simultaneously The ENVI spectral math help only seems to address it on a pixel-by-pixel basis, and I need to subtract the Martian dust spectrum from an entire image.
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1 |
1371 |
06 Aug 2007 07:35 AM |
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1 Replies and 1394 Views
Read/write associated DEM file name? 1394 1
Started by Deleted User
So am I missing something, or can you not programmatically read or write the name of an associated DEM (the 'dem file' and 'dem band' settings) to a header file If this isn't possible, any chance of getting it into ENVI 4.4
Jeff
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1 |
1394 |
01 Aug 2007 01:51 PM |
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2 Replies and 1344 Views
Adding tiling to an ENVI/IDL program - smoothing/averaging HSI data 1344 2
Started by Deleted User
I have code for IDL to smooth hyperspectral data by utilizing a moving average. I need to add a function to tile the information, because I am currently limited to what memory my computer has available (which isn't much). Alternatively, are there any modules in ENVI that can average spectra, because I have used the spatial smoothing functions, but perhaps there is a way to apply this to the spectral data
I've included my code below.
Thanks!
============================================...
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2 |
1344 |
30 Jul 2007 08:34 AM |
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1 Replies and 1584 Views
Cannot install ENVI 4.3 on Ubuntu Linux 7.04 (x86_64) 1584 1
Started by Deleted User
Hi,
I'm having difficulty installing ENVI on Ubuntu 7.04 (x86_64). I can run the installer, accept the license, and choose the options to install, and get past the installation summary. After that, I get an immediate error:
/usr/local/rsi/idl_6.3/bin/post_unpack was not found. There may be errors setting up the product environment.
This is followed by a number of other errors stating that various scripts were not found or files were not found so no links were created.
/usr/loca...
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1 |
1584 |
26 Jul 2007 01:15 AM |
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0 Replies and 1259 Views
Importing OMEGA data into ENVI 1259 0
Started by Deleted User
Does anyone know how to import OMEGA (from Mars Express) data into ENVI to overlay it on a MOLA basemap
Thanks,
~Tanya
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0 |
1259 |
25 Jul 2007 08:32 AM |
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1 Replies and 1204 Views
ENVI on windows vista 1204 1
Started by Deleted User
Hi listers,
Does anyone knows if envi works on windows vista
Andrew
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1 |
1204 |
24 Jul 2007 10:40 AM |