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1 Replies and 1390 Views
SPOT 5 Object based classification in ENVI 1390 1
Started by Deleted User
Folks,
I have SPOT 5 imagery. I have selected ROIs and have classified the imagery. Now I want to make it another way which is object based classification (segmentation) which I believe will improve the classification result and polygon shape. All I have is SPOT 5 imagery and ROIs. How can I do it Any Idea please
Asif
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1 |
1390 |
23 Aug 2013 10:34 AM |
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3 Replies and 3580 Views
Landsat 8 in ENVI Classic 3580 3
Started by Deleted User
Here's the situation (forgive the long lead-up). I have a Landsat 8 image. When downloaded from GloVis each of the bands 1 through 11 is a seperate TIFF image. I will not be using bands 1, 9, 10, or 11 for my evaluation, so I open bands 2-8 in ENVI Classic and create a stacked image of all of those bands (the bands are ordered 2, 3, 4, 5, 6, 7, 8). If I then want to create an NDVI image, which bands do I designate as Red and NIR in the NDVI dialog box. I know that technically those are the ...
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3 |
3580 |
23 Aug 2013 07:48 AM |
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1 Replies and 1193 Views
SVM Support Vectors 1193 1
Started by Deleted User
I'm curious if there is a way in ENVI to determine which ROIs per class were used as the support vectors in an SVM classification My understanding of the SVM algorithm is that it does not necessarily use all of the ROIS indicated as training data in the actual creation of the classification but uses mathmatical calculations to determine the optimal hyperplane and that the ROIS that are closest to that "line" are the support vectors. I'd be curious to know if there was a way to see w...
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1 |
1193 |
22 Aug 2013 07:03 AM |
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1 Replies and 1425 Views
SPOT 5 DEM 1425 1
Started by Deleted User
Hello all,
I am working on SPOT 5 2.5 meter imagery. For orthorectification, I need DEM. From where can I get it
Asif
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1 |
1425 |
21 Aug 2013 12:38 AM |
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2 Replies and 1234 Views
Working with digital terrain model 1234 2
Started by Deleted User
Hi folks,
I have a digital terrain model that I would like to run a basic classification on (two topography classes), but I'm not sure if I can do it with Envi. The help it says there's an additional module for creating DEMs that you can purchase, but this DTM is already made, so I'm not sure if I still need that module.
This DTM came to me in a file format I'm not completely familiar with. I know this is a pretty nebulous question to ask, but can Envi load and classify DTM files The file stru...
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2 |
1234 |
19 Aug 2013 11:11 AM |
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1 Replies and 1311 Views
ENVI tools for Arcgis - thresholding 1311 1
Started by Deleted User
Hi, I would like to use the ENVI for Arcgis thresholding tool to threshold a set of greyscale images. I tried Otsu's method and the results look good. Problem is I can't find anywhere that states what the calculated threshold is!
any suggestions
John.
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1 |
1311 |
15 Aug 2013 04:42 PM |
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2 Replies and 1553 Views
Crop estimation steps in ENVI 1553 2
Started by Deleted User
Folks,
I am working in a project which aims to calculate a specific crop using SPOT 5 imagery. Here are the steps I follow
1. Select ROIs
2. Apply any of the classifiers (I have applied both supervised and unsupervised)
3. Generate statistics
So far, It looks good but I have to verify my results. I have a feeling that it wouldn't be that easy and I would have to do something very complex and technical. If it really is like that, what should I do If not, am I ready to ask a surveyor for results...
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2 |
1553 |
15 Aug 2013 01:46 AM |
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1 Replies and 1268 Views
mosaic tool 1268 1
Started by Deleted User
Hello,
I'm trying to make mosaic from atmospherically corrected (used ATCOR4) lines, also using cutline feathering. Result pop up blank. Result has statistics. I tried play with histogram, nothing.
It works without cutline feathering. It's some kind of issue about this feathering. I want to use nadir information for mosaic, so it need to be solve!:)
With original lines mosaic and also feathering are work.
Any ideas could be good
King regards,
Skywalker
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1 |
1268 |
09 Aug 2013 02:34 AM |
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1 Replies and 2929 Views
how to remove background value in ENVI classic? 2929 1
Started by Deleted User
Hi
I have processed my SPOT 5 imagery until georecitificaiton. But someone really picky wants me to remove the background value from each imagery in order to get her ideal imagery to mosaic. Please teach me how to do that in ENVI classic. Thanks a lot.
Jenny
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1 |
2929 |
08 Aug 2013 02:49 PM |
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3 Replies and 1380 Views
Spectral Angle Mapper 1380 3
Started by Deleted User
Hello,
Could anyone assist me with the use of Spectral Angle Mapper (SAM). I have been trying to use it to identify minerals in a certain area. The software is relatively new to me and i am having trouble applying this method of classification. I have an ASTER image and ASCII data. I was thinking maybe it is the data I have! but just in case, if anyone could help me with the application, I would really appreciate it.
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3 |
1380 |
07 Aug 2013 11:58 AM |
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3 Replies and 1105 Views
scaling 1105 3
Started by Deleted User
Hello everyone,
Is it possible scale (pixel value) only a subset of the image I mean scale pixels under some mask.
I want to scale all image except water objects. I can't make value range in band math and multiple because values are crossing in all bands ( i have 48 band image ). So i wounder before i press process button in bad math i could select spatial subset for non water area and it multiples only subset area. I tried it but it doesn't worked.
I hope for some solutions.
Kind regards,
Sky...
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3 |
1105 |
07 Aug 2013 08:06 AM |
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1 Replies and 1453 Views
color balance in mosaic tool 1453 1
Started by Deleted User
Can anyone tell me what is the algorithm used for color balancing in the mosaic tool or, where too find this information (the content in the help manual is too general)
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1 |
1453 |
07 Aug 2013 07:08 AM |
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4 Replies and 1216 Views
Opening Landsat-7 with metadata file: Error 1216 4
Started by Deleted User
Hi experts,
When I tried to open Landsat-7 bands using its metadata file I got this error:
"there is an error reading the file because array dimensions must be greater than one"
explain this please
Bye
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4 |
1216 |
06 Aug 2013 04:07 PM |
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2 Replies and 1271 Views
Band math 1271 2
Started by Deleted User
Hello everyone,
Help me please. Band math don't do what tell. I wrote an expression ((b1 le 1730)*2)b1, it means that every value less than 1730 multiplys by 2 and then adds the original values. Simply, every value less than 1730 should be 3 times bigger. What the band math do, it adds value 2 to every value which is less than 1730 (for example, if the value is 101, now it is 103, but should be 303).
For more information, for variable i'm choosing 48 band image.
King regards,
Skywalker
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2 |
1271 |
02 Aug 2013 02:06 AM |
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1 Replies and 1233 Views
Build pyramids for raster data 1233 1
Started by Deleted User
I have atmospherically corrected a number of RapidEye (L3A) tiles and one of them appears red in colour. I have re-processed this tile a number of times to ensure that the same methodology was applied to all images, but it looks to me that the raster pyramid is not being built. Can I force ENVI 5.0 to build pyramids for this particular tile
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1 |
1233 |
24 Jul 2013 07:35 PM |
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2 Replies and 1576 Views
Open .SID from GDB or catalog 1576 2
Started by Deleted User
I have .sid I want to mosaic in ENVI, it is currently processed and in a FGDB, in unmanaged catalog or in a datatile. When I try to open it from ENVI using OPEN AS \ Other Format \ .SID and navigate to the FGDB, all I can see is the FGDB are the DB extensions, no image file.
Connecting using REMOTE DATABASE says file UNSUPPORTED
I can open the .sid file if it is in a normal windows explored folder, outside of a FGDD, Catalog or processed data tile.
Bottom line HOW CAN I BRING IN .SID from a FGD...
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1576 |
24 Jul 2013 07:59 AM |
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1 Replies and 1212 Views
Save/restore layers in ENVI 5.0 1212 1
Started by Deleted User
In ENVI Classic, I am able to save a session to script. For the life of me, I cannot figure out how to do the same in ENVI 5.0 via the GUI. Can someone please advise
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1 |
1212 |
23 Jul 2013 05:52 PM |
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3 Replies and 1295 Views
ENVI 5 ROI question 1295 3
Started by Deleted User
I assume I'm missing something obvious, but I've searched through the Help documents and couldn't find a reference to this. I've been working in ENVI Classic and now have access to ENVI 5 but am having some issues getting used to the new interface. Currently my biggest issue is that I cannot find the ENVI 5 equivilent of the Goto feature that was available in the ENVI Classic ROI tool. This let me select an ROI category and easily jump from one point/polygon in that class to the next (handy w...
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3 |
1295 |
23 Jul 2013 01:13 PM |
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2 Replies and 1243 Views
2D Scatter Plots 1243 2
Started by Deleted User
Why doesn’t 2D Scatter Plots show the whole Scroll
Why is it limited to the Image window
How can I get it to show a scatter plot for the whole Scrollwindow
How can I use this function in IDL directly Especially theDensity Slice
Thanks
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2 |
1243 |
22 Jul 2013 08:39 AM |
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1 Replies and 1566 Views
FLAASH and landsat-5 TM scene center 1566 1
Started by Deleted User
Hi experts,
How can I get the scene center and the average altitude of a landsat-5 TM image for input them in FLAASH module. I could not find these data in the metadata file of the scene:
GROUP = L1_METADATA_FILE
GROUP = METADATA_FILE_INFO
ORIGIN = "Image courtesy of the U.S. Geological Survey"
REQUEST_ID = "0101303083969_00001"
PRODUCT_CREATION_TIME = 2013-03-09T04:11:32Z
STATION_ID = "EDC"
LANDSAT5_XBAND = "1"
...
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1 |
1566 |
20 Jul 2013 02:55 PM |