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1 Replies and 1369 Views SPOT 5 Object based classification in ENVI  1369  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
1 1369
23 Aug 2013 10:34 AM
3 Replies and 3508 Views Landsat 8 in ENVI Classic  3508  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 ...
3 3508
23 Aug 2013 07:48 AM
1 Replies and 1177 Views SVM Support Vectors  1177  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...
1 1177
22 Aug 2013 07:03 AM
1 Replies and 1395 Views SPOT 5 DEM  1395  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
1 1395
21 Aug 2013 12:38 AM
2 Replies and 1216 Views Working with digital terrain model  1216  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...
2 1216
19 Aug 2013 11:11 AM
1 Replies and 1295 Views ENVI tools for Arcgis - thresholding  1295  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.
1 1295
15 Aug 2013 04:42 PM
2 Replies and 1505 Views Crop estimation steps in ENVI  1505  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...
2 1505
15 Aug 2013 01:46 AM
1 Replies and 1243 Views mosaic tool  1243  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
1 1243
09 Aug 2013 02:34 AM
1 Replies and 2892 Views how to remove background value in ENVI classic?  2892  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
1 2892
08 Aug 2013 02:49 PM
3 Replies and 1352 Views Spectral Angle Mapper  1352  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.
3 1352
07 Aug 2013 11:58 AM
3 Replies and 1084 Views scaling  1084  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...
3 1084
07 Aug 2013 08:06 AM
1 Replies and 1426 Views color balance in mosaic tool  1426  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)
1 1426
07 Aug 2013 07:08 AM
4 Replies and 1192 Views Opening Landsat-7 with metadata file: Error  1192  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
4 1192
06 Aug 2013 04:07 PM
2 Replies and 1242 Views Band math  1242  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
2 1242
02 Aug 2013 02:06 AM
1 Replies and 1209 Views Build pyramids for raster data  1209  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
1 1209
24 Jul 2013 07:35 PM
2 Replies and 1551 Views Open .SID from GDB or catalog  1551  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...
2 1551
24 Jul 2013 07:59 AM
1 Replies and 1192 Views Save/restore layers in ENVI 5.0  1192  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
1 1192
23 Jul 2013 05:52 PM
3 Replies and 1266 Views ENVI 5 ROI question  1266  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...
3 1266
23 Jul 2013 01:13 PM
2 Replies and 1207 Views 2D Scatter Plots  1207  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
2 1207
22 Jul 2013 08:39 AM
1 Replies and 1542 Views FLAASH and landsat-5 TM scene center  1542  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" ...
1 1542
20 Jul 2013 02:55 PM
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