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3 Replies and 1469 Views
Combine Classes. 1469 3
Started by Deleted User
Hi!
I need some help. I have a few layer with some classes and i want to do one image with all classes, using ENVI. How can i overlay/combine all classes in one image
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3 |
1469 |
22 Apr 2014 06:56 AM |
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1 Replies and 1374 Views
User Define Map Projection 1374 1
Started by Deleted User
Can I define new map projections with more spheroids and datums.
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1 |
1374 |
21 Apr 2014 11:05 PM |
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3 Replies and 1327 Views
LANDSAT 8--supervised classification problems 1327 3
Started by Deleted User
Hi--having some problems classifying Landsat 8 imagery that I've never had before. I have an layer stack of 4-bands, and simply trying to do the usual ROI routine (ROIs contain anywhere from 70 to 700 pixels). I keep getting all black images. I checked the rule images, and they're all negative. I think someone may have posted a similar problem a year or two ago, but didn't see an answer. Any idea what I'm doing wrong here Never had an issue before. I have NOT yet run FLAASH corrections-...
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3 |
1327 |
18 Apr 2014 03:55 PM |
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0 Replies and 1313 Views
Spectral Resampling steps 1313 0
Started by Deleted User
Hi
I a trying to do Spectral Resampling of USGS and JPL to resample spectral data files of my endmemebers Extracted from both lab and Image spectra, but due to i am new user for envi i got error results and bad resamples. I've follow help nots and google it but i still have difficulty to do it. could you please help. I am using ENVI 5.1 and Landsat 8 image.
Have a great Day
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1313 |
18 Apr 2014 11:10 AM |
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0 Replies and 1231 Views
Radiometric Correction and Atmosphiric Correction 1231 0
Started by Deleted User
I have some misunderstanding with Image Radiometric Correction and Atmosphiric Correction. I have seen YouTube video for this. I am working with Landsat 8 data and ENVI 5.1. I have seen a video "Atmospheric correction of Landsat 8 Using ENVI 5 0 3" I wants to know when I apply Flaash atmospheric correction is it starts after the result of DOS is it inbuilt with ENVI 5.1 'Radiometric Calibration Tool'
I request you Please share a movie/paper with whole correction proces...
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1231 |
18 Apr 2014 02:34 AM |
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1 Replies and 1633 Views
having an error with FLAASH 1633 1
Started by Deleted User
i'm having an error when running FLAASH
the message windows is like this :
problem:the FLAASH program exited with following errors:
ACC error:avrd:
IDL error:
Illegal subscript range:FIMAGE:
ACC_AVRD
ACC_HYPER2
ACC_ACC
ENVI_ACC_EVENT
ENVI_FLAASH_PROCESS_MANAGER
IDLRTMAIN
$MAIN$
what does this mean How can I fix it
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1 |
1633 |
17 Apr 2014 03:18 AM |
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0 Replies and 1321 Views
How do I chip a file with FULL resolution? 1321 0
Started by Deleted User
I want to save my file as an image (TIFF is fine). But the normal save doesn't include image enhancements such as color tables.
So I tried chipping, but that only exports in screen resolution.
How do I save my file as an image (including modifications to the color tables) - but at FULL resolution
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0 |
1321 |
16 Apr 2014 11:41 AM |
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4 Replies and 1456 Views
SPEAR Relative Water Depth tool and SPOT 1456 4
Started by Deleted User
Hi,
As SPOT doesn't have a blue band, can you confirm whether the SPEAR relative water depth tool automatically substitutes the green and red bands instead of blue and green Or is SPOT imagery not suitable for use with the SPEAR RWD tool.
Thanks in advance,
Conor.
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4 |
1456 |
16 Apr 2014 03:47 AM |
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0 Replies and 1281 Views
Regression in Scatter plot? 1281 0
Started by Deleted User
I am using scatter plot (ENVI 4.8) to plot satellite image data.
Is there a way to perform a linear regression and to draw the regression line along with the 1:1 line in the same plot
I am a new user of ENVI/IDL.
I am sure IDL can help, but I am not familiar with it as to write any code.
Thanks
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0 |
1281 |
13 Apr 2014 05:39 AM |
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7 Replies and 1726 Views
Can&39;t get the Vegetation Index Calculator to work 1726 7
Started by Deleted User
I'm working with ENVI 5.0 (I don't have a say in updating it to 5.1), and I'm using LandSat 8 data. I opened the individual files for all 11 bands, performed layer stacking to get a single multiband file, and edited the header to input the center wavelengths for each band.
When I try to run the Vegetation Index Calculator, I get an error that says "No band combinations can be found that match those required to calculate any available vegetation indices." I would have thought tha...
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7 |
1726 |
11 Apr 2014 11:15 PM |
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0 Replies and 1356 Views
No HSI Image Displayed in ENVI 5.0 1356 0
Started by Deleted User
Hi,
When using ENVI 5.0 no image is displayed when the HSI file is opened. This happens for single band and RGB images. The same file displays fine using ENVI 4.8. If the "Overview" box is checked then an error box opens with the following message:
Internal Error: Tag name TIME is undefined for structure IDLCFVISWORLD
Keith
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1356 |
10 Apr 2014 05:05 PM |
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2 Replies and 1431 Views
Reading Hyperspectral image using ENVI and summing in IDL code 1431 2
Started by Deleted User
Dear Users,
I am trying to write and IDL code in which I read a few hyperspectral cubes with ENVI and sum over all pixels and bands in each cube.
I used the following example:
ENVI_OPEN_FILE, r_file, r_fid=fid
ENVI_FILE_QUERY, fid, dims=dims
data = ENVI_GET_DATA(fid=fid, dims=dims, pos=0)
This gives me the first band image. By changing pos, I am getting the data in different bands. Then by using total(data), I am summing the values within that image. Is there a way to get the data for all ba...
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2 |
1431 |
10 Apr 2014 04:27 PM |
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4 Replies and 2157 Views
Starting ENVI from IDL command line 2157 4
Started by Deleted User
Dear users,
I like starting envi from IDL command line. However, when I type "envi", the "envi classic" starts. But, I want to use the envi 5.1. Is there a way to link "envi 5.1" to the command "envi" in IDL (instead of the classic envi)
Thanks, - NG
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4 |
2157 |
04 Apr 2014 11:31 AM |
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3 Replies and 4855 Views
Band Math for NDWI 4855 3
Started by Deleted User
Hi,
I am very new to this forum and I am wonder how to calculate the (NDWI....WATER INDEX) of WorldView-2 and SPOT-5 images in ENVI 5.0. I just tried of using band math by inserting (b1-b8) / (b1b8) for WV-2 but it gave values not in the range of -1 to 1), hundred something.
How should I address this issue or else any alternative
Thanks for your anticipation.
Zana
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3 |
4855 |
30 Mar 2014 11:44 PM |
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1 Replies and 1429 Views
Scatter Plot. help 1429 1
Started by Deleted User
Hi, I need help.
I have an image composed of two bands, and I need to understand the relation between the values in the two bands. Due to this I used the tool " 2D scatter plots"... now my point is that I need to import this scatter plot to execute some statistical analysis ( e.g. an excel spreadsheet). Is there a way to do this ..( i have seen I can save it as an image,but that's not enough for my analysis) I tried also to use the statistic on both the bands, but in that case, not ha...
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1429 |
29 Mar 2014 02:54 AM |
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3 Replies and 2052 Views
Problem reading MTL file (Rookie question!) 2052 3
Started by Deleted User
Hi all,
I realise this is probably close to the category "stupid questions".
I have worked a bit with the previous version of ENVI, while working with Landsat 7 images to find NDVI values.
We use the program Atcor for atmospheric corrections, and I used to open all the image files (channels 1-7) and the MTL-file into ENVI and creating an ENVI standard file of them all, and take that one into Atcor.
But since sometime last year, they do not provide the old type of MTL files anylonger, ...
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3 |
2052 |
26 Mar 2014 11:21 AM |
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1 Replies and 1615 Views
DN values 1615 1
Started by Deleted User
Hello all,
I'm looking for a quick way to find the percentage of the maximum and minimum values contained in an image. for example, if it was an 8bit image I would be looking for the percentage of pixels that contained a DN value of 0 and 255. Eventually I'd like to turn this into an IDL script to perform this on a large number of images. These images will contain 3 bands (RGB). Can ENVI do this and if so how might I go about it Thanks in advance
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1 |
1615 |
25 Mar 2014 04:14 PM |
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3 Replies and 1467 Views
Similiar to AutoSync ? 1467 3
Started by Deleted User
Questions : if you look at ERDAS Autosync I am wondering if ENVI 5.0 has a similar to it I need to perform alignment some of the ASTER on a Landsat Or is there a tools that will allow me to do that on ENVI Thanks
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3 |
1467 |
24 Mar 2014 10:40 AM |
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0 Replies and 1399 Views
SIEVE 1399 0
Started by Deleted User
Hi,
What is the max Sieve tool (Post Classification) Group Min Th parameter with no error in output
I tried Group Min Th (690) and Number of Neighbors 8. It seems that Group Min Th parameter doesn't work. It sieve the class edges even if the pixel group are 1 million pixels. It seem sieve tools divides classification image into blocks and looks only into this blocks for the paramiters.
Please explain me how the sieve tool works.
Cheers,
Jevgenijs
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0 |
1399 |
21 Mar 2014 12:55 AM |
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1 Replies and 1494 Views
graphical modeler 1494 1
Started by Deleted User
Just an idea...is there any demand for a graphical modeler (similar to ESRI model builder) for ENVI I'd find it would be a nice addition for those who want to create customized workflows but don't want to quite dive into all the IDL stuff. It'd be a good teaching tool as well.
Any thoughts, especially from the ENVI folks
Mike
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1 |
1494 |
20 Mar 2014 09:36 AM |