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0 Replies and 1103 Views
Extracting individual pixels from an ROI 1103 0
Started by Deleted User
Hi,
I need to extract the individual pixels from an ROI to an ASCII file for further processing. It would also need to loop through multiple files and print their pixel values too.
This is my current code but I can't seem to get ENVI_GET_ROI_DATA to work. Any help would be much appreciated.
Thanks
;restore the base ENVI save files
envi,/restore_base_save_files
;initialize batch mode
envi_batch_init, log_file='batch.txt'
; create a string
tiles="...
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0 |
1103 |
17 Nov 2010 09:11 AM |
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1 Replies and 1352 Views
Replacing Bad Line 1352 1
Started by Deleted User
I am using Landsat MSS data downloaded from USGS website. The image has many bad line running from left to right, throughout the image. The lines are not exactly horzontal but slightly tilted.
Could you please suggest me how to replace these lines by taking average of line above and below these bad lines.
I am using Envi 4.5.
I tried using replace bad line option but it asks for line number to be replaced. The problem is the bad lines keep on changing when we move from left to right....
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1 |
1352 |
16 Nov 2010 01:44 AM |
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0 Replies and 1134 Views
Replacing Bad Line 1134 0
Started by Deleted User
I am using Landsat MSS data downloaded from USGS website. The image has many bad line running from left to right, throughout the image. The lines are not exactly horzontal but slightly tilted.
Could you please suggest me how to replace these lines by taking average of line above and below these bad lines.
I am using Envi 4.5.
I tried using replace bad line option but it asks for line number to be replaced. The problem is the bad lines keep on changing when we move from left to right....
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0 |
1134 |
16 Nov 2010 01:43 AM |
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3 Replies and 1140 Views
Spatial subset problem 1140 3
Started by Deleted User
Dear All
When i am going for spatial subset of Hyperion image (Original Image or Atmospherically corrected using FLAASH) ENVI is asking for resampling of the data. Which deteorate my data as Hyperions spatial resolution is 30 m. How I can spatially subset data without resampling
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3 |
1140 |
15 Nov 2010 07:42 AM |
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1 Replies and 1345 Views
Negative Values in Processed Image 1345 1
Started by Deleted User
Dear All
I have applied Atmospheric correction to Hyperion image. Now the corrected image contains negative values. How it can be removed Recentaly I have applied ICA, in ICA output image most of the pixels also contains negative values. How we can solve this problem
Hasmukh
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1 |
1345 |
15 Nov 2010 07:04 AM |
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1 Replies and 1218 Views
SVM combination method 1218 1
Started by Deleted User
I was wondering what envi uses as the combination scheme in SVM classification. Is it One Against All (OAA) or One Against One (OAO)
Thanks,
Yasser
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1 |
1218 |
14 Nov 2010 12:04 PM |
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1 Replies and 1225 Views
SCM classifucation inENVi 1225 1
Started by Deleted User
doae any know how it is possible to have spectral correlation mapper in ENVI
it is really urgent for me.please
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1 |
1225 |
10 Nov 2010 11:55 AM |
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1 Replies and 1133 Views
how to put threshold for rule classifier? 1133 1
Started by Deleted User
Dear all,
I have problem for rule classification.well in there we should inter a threshold for each class but what is the suitable value
I tried first to put the angle in the SAM calssification and then by checking the pre material values in the rule images which was zero for all pure materials and put the max to zero but it does not work.
I would be happy to have any guidance over that.
Best regards,
Bita
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1 |
1133 |
10 Nov 2010 11:52 AM |
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1 Replies and 1603 Views
new datum for map projection ETRS 1989 1603 1
Started by Deleted User
Hi all,
I can't open CORINE landcover rasterdata (http://www.eea.europa.eu/data-and-maps/data/corine-land-cover-2006-raster) in envi because the correct datum for the map projection is missing.
I tried to build a new datum European Terrestrial Reference System 1989 ETRS1989 for the Lambert azimuthal equal area coordinate reference system
(http://epp.eurostat.ec.europa.eu/portal/page/portal/gisco/documents/MAP_PROJECTIONS_FOR_EUROPE.PDF page 123)
according to http://www.ittvis.c...
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1 |
1603 |
10 Nov 2010 04:27 AM |
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7 |
1487 |
08 Nov 2010 11:25 PM |
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0 Replies and 1167 Views
assign roi color via code 1167 0
Started by Deleted User
Hi all,
How (via code) can I change the color/name values of an existing ROI If the ROI has to be redefined and created, how can I get the xpts/ypts for the existing ROI
After talking to tech support, the answer is 'you can't'. The current option is to create a new roi with the colors/names redefined. Unfortunately, the xpts/ypts for polygons are unrecoverable so, the simplest option is to create the new roi as a set of all points in the original roi.
Jim
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0 |
1167 |
04 Nov 2010 01:20 PM |
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1 Replies and 1115 Views
extracting ndvi from landsat tm 1115 1
Started by Deleted User
i used envi software to get the ndvi of my landsat image, I clicked on transform ndvi, then in my output result i chose file then in the output data i clicked on floating point, is that correct when i displayed the ndvi image i got a grayscale image, is that right if so, how do i find the ndvi values of the pixels that ranges from -1 to 1 so that i ll be able to know if its vegetated or not. anyone please i need the answer asap thanks
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1 |
1115 |
03 Nov 2010 11:17 PM |
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0 Replies and 1376 Views
problem with the scroll window in envi 1376 0
Started by Deleted User
Hi,
I am having a strange problem with the scroll window of envi. When I want to maximize it, it first becomes tiny and goes to one corner and then after about 10-20 secs it maximizes. Then when I want to link two windows that also takes about 20 secs before the link window opens up. It was not doing this before. Does it have to do something with the memory of my laptop. I am running envi on a 64 bit Windows 7 operating system with 4GB RAM. Any kind of suggestions will of great help.
Tha...
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0 |
1376 |
02 Nov 2010 01:55 PM |
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1 Replies and 1241 Views
Envi Orthoretification 1241 1
Started by Deleted User
Can anyone help me in doing Orthorcetification in ENVI
I am trying to orthorectify IKONOS image. I downloaded both ASTER DEM and SRTM for the orthorectification, and then changed the projection of IKONOS image from JGD2000 to UTM ( this image was taken in Japan) by ENVI to adapt with the projection of ASTER or SRTM. However, after filling all of the necessary parameters in the Orthorectification Parameter table, I could not process the image due to an error: "Problem: Image and DEM do...
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1 |
1241 |
02 Nov 2010 02:11 AM |
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0 Replies and 1350 Views
help for procedure 'ENVI_MASK_DOIT' 1350 0
Started by Deleted User
hi, folks
when I conduct clipping an image via an vector EVF file, I found some guy employed procedure 'ENVI_MASK_DOIT' to create a mask for the image file.
But I can not find any information about this procedure in ENVI / IDL help. what I can make sure is that this is not an user defined procedure. I want to know the detail information of this procedure,
ps: the code is :
====================
ENVI_MASK_DOIT,$
AND_OR =1, $
/IN_MEMORY, $
ROI_IDS= roi_ids, $
n...
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0 |
1350 |
01 Nov 2010 08:03 PM |
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0 Replies and 997 Views
output_to_external data type 997 0
Started by Deleted User
Hello,
I'd like to export .img (binary) files to ArcView raster (.bil). I can do this successfully in the GUI w/ File>Save As>Arc View Raster however I need to batch it.
My script 'works' except the output is long integer rather than byte (the binary is float-- I don't know why envi converts it to long integer). The GUI gives me this selection option (for byte, long etc) but the key word data_type isn't accepted for the function envi_output_external_format
Any suggestions Code bel...
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0 |
997 |
01 Nov 2010 03:49 PM |
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0 Replies and 1230 Views
Automatically Coregister Images 1230 0
Started by Deleted User
Dear all,
anyone know which method used in "Automatically Coregister Images"
I mean "Area-based image matching" used NCC LSM or which one method to calculate
and which method used in "Feature-based image matching" just can saw the progress show some about DoG....
I did some test but want to get more detail,
thanks,
Best,
Kevin
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0 |
1230 |
27 Oct 2010 09:53 PM |
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2 Replies and 1458 Views
12-bit 8-bit image comparison. 1458 2
Started by Deleted User
The image of the right is a histogram of a NITF file loaded with a 1 band image (using 12-bit jpeg2000 compression, or C8)
The image of the left is a histogram of the JPEG file that was saved from the loaded NITF file (using ENVI of course)
I was wondering what kind of algorithm does ENVI apply to the 12-bit image to properly reduce it to 8-bit
Obviously it is more than just division by 16. Thoughts I would like to be able to use this technique.
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2 |
1458 |
27 Oct 2010 08:50 PM |
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7 Replies and 1306 Views
Minimum & Maximum from Image stack 1306 7
Started by Deleted User
Dear all
I'm searching for a function that allow me to calculate an image containing the Minimum and (separately) Maximum from a multiband image.
What I need is to obtain an image where for each pixel correspond the Minimum DN of the vertical pixels of stacked layers composing an image. The same for the Maximum.
In the menu Basic Tools > Statistics > Sum Data Bands are available different interesting outputs but not the Min & Max .
Someone can help me Any solution using the Band...
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7 |
1306 |
27 Oct 2010 03:48 AM |
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1 Replies and 1488 Views
ENVI Zoom toolbox 1488 1
Started by Deleted User
Hi everybody,
I am trying to use some of the tools of ENVI 4.7 in ENVI Zoom, but cannot show up the ENVI Favorites folder in the Toolbox window... Is that a license problem or it's just something about settings thanks a lot!
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1 |
1488 |
26 Oct 2010 12:45 PM |