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7 Replies and 2642 Views
Creating a new raster with ROI Tool 2642 7
Started by Deleted User
<p>I am using ENVI 5.3 in Windows 10. I need to create a new smaller raster image from an existing raster that is a tif file. I was under the impression I could do this by using the ROI Tool. I have tried this by creating an ROI from geometry, as instructed on this webpage http://www.exelisvis.com/docs/RegionOfInterestTool.htmlROIGeometry. I draw the rectangle over the raster and make its color solid, then rename it. I have tried saving it, and the only format available is xml. W...
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7 |
2642 |
29 Oct 2015 11:40 AM |
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4 Replies and 1588 Views
What about the radiance gains and offset changes after Gap filling? 1588 4
Started by Deleted User
I have applied USGS Defined method for Gap filling for Landsat ETM data. After i have to apply T-cap... but when i check its spectral properties in ERDAS, it shows slight different values in Radiance Gain and Offset (a addition and subtraction of 0.4 from gain and offset for each of bands 1:, & 7)... My question is... should I use these new values or use the default values for T-cap generation What is the reason for the change in the values<br />
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4 |
1588 |
29 Oct 2015 12:18 AM |
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1 |
1622 |
24 Oct 2015 04:17 AM |
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1 Replies and 1942 Views
NDSI 1942 1
Started by Deleted User
Please comment !what are the steps for atmospheric correction of Landsat 8 imagery to get accurate snow cover map
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1 |
1942 |
24 Oct 2015 02:33 AM |
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1 Replies and 1597 Views
Flaash apply error 1597 1
Started by Deleted User
calculation for solar elevation for given date time log, lat. is very small with a apx value 19.34.
Abrar
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1 |
1597 |
24 Oct 2015 02:27 AM |
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1 Replies and 2700 Views
Invalid Object Reference 2700 1
Started by Deleted User
Hello,
I've run a couple of times the feature extraction module (example based) for a 3 Landsat 8 image mosaic and while running the classifications (SVN) I'm getting the same error: invalid object reference )>. I've seen that there are two more threats but related to ROI creation so not really sure what is happening. Not sure about the internal processing while running the algorithm but as it happens just after starting the process it might be also related. Guess that the first internal step is...
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1 |
2700 |
23 Oct 2015 09:13 AM |
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1 Replies and 2485 Views
Only 1 band available for display in multiband .tif file 2485 1
Started by Deleted User
I have a stacked .tif file with 6 bands from Landsat 5. When I open the image in Envi 5.3 though and choose change RGB bands only the red icon is available and I cant set the green and the blue. Anyone know what might cause this In Envi classic all bands are able to be selected still.
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1 |
2485 |
21 Oct 2015 03:17 PM |
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1 Replies and 1576 Views
Layer Stacking and NoData 1576 1
Started by Deleted User
Dear forum members
I have 18 single-band TIFF files covering approximately the same area and I want to layer stack them. Each file was set to have a data ignore value (0). But I noticed the command (layer stacking with the exclusive range option selected) is not using this value to produce a multi-band image only with valid data in the overlapping pixels. It is also including those pixels that have valid data in some TIFF files and in others.
Thanks
Joao
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1 |
1576 |
21 Oct 2015 08:02 AM |
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3 Replies and 1624 Views
FLAASH error for processing hyperspectral data 1624 3
Started by Deleted User
Dear Support Staff,
I has been trying to use FLAASH to process our UAV hyperspectral data (radiance)
Here is the error message popped out:
ACC error...
IDL error: -362
End of input record encountered on file unit: 0.
in context: convert7
calls:
ACC_CONVERT7 ACC_HYPER2 ACC_ACC
ENVI_ACC_EVENT ENVI_FLAASH_PROCESS_MANAGER IDLRTMAIN
$MAIN$
I also attached the template for anyone who kindly could help identify the issue:
;
;ENVI FLAASH PARAMETERS TEMPL...
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3 |
1624 |
15 Oct 2015 12:14 PM |
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1 Replies and 1619 Views
imagery 1619 1
Started by Deleted User
I've recently purchased a WorldView2 image that I know has been georeferenced and orthorectified, but I'm not sure whether the spectral numbers from the image are digital numbers, radiance, top of atm reflectance, or scaled surface reflectance. I don't see explanation of this in the imagery documentation. How can I find out
Itiya
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1 |
1619 |
14 Oct 2015 01:00 PM |
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2 Replies and 1617 Views
Prevent Layer Stacking from assigning NaN to 0&39;s 1617 2
Started by Deleted User
I have 80 landsat scenes that I have masked out clouds on for each individual band, and now I want to layer stack them and create some histograms. I realized though that when each individual band is stacked the no data pixels are being automatically assigned a value of 0. Is there a way to prevent this from happening since it messes up my histograms Possibly this can only be done in IDL
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2 |
1617 |
12 Oct 2015 11:55 AM |
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3 Replies and 1711 Views
Radiometric calibration & water masking 1711 3
Started by Deleted User
I am trying to calibration a Landsat 8 scene to TOA reflectance but as the scene has water, I would like to mask the water before performing the calibration. I have built a ROI using the Threshold value but when I go to build the mask, the function can't see the ROI I created. Kindly explain what I need to do for the Build Mask function to see the water ROI.
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1711 |
08 Oct 2015 06:47 AM |
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4 Replies and 1332 Views
Any advice n TCT in Confusion Matrix in ENVI 5.2 1332 4
Started by Deleted User
Im working on ENVI 5.2, with Tasseled cap (TCT). The resulted output from this process is in ENVI Standard format, which shows error when used as an input in Confusion Matrix... For this i want its output in ENVI Classification format. I also tried this by using "Edit ENVI Header" tool... This requires Classes for classification... I dont know how to add/select classes from TCT image. Kindly Suggest...
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4 |
1332 |
07 Oct 2015 11:30 AM |
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5 Replies and 1971 Views
Vegetation Indices 1971 5
Started by Deleted User
Dear Exelis support,
I was trying to generate some VIs from surface reflectance Landsat 5 TM data and I find it odd that only the NDVI and SRI are available for this sensor. At least all five broadband greenness indices can be calculated with the spectral information available from the TM sensor.
Thanks
Joao
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5 |
1971 |
07 Oct 2015 03:42 AM |
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6 Replies and 1964 Views
NDVI Usage in Confusion Matrix 1964 6
Started by Deleted User
I am working on NDVI in ENVI... the output file is in Envi Standard format... I required it in Envi Classification format, which can be done through Envi Edit Header tool... This requirement is for its use in Confusion Matrix using Ground Truth Image... but when i performed this, the resulted NDVI image transformed into BLACK color showing as 'unclassified OR class1' portion (what ever name was suggested at the time of conversion into classification format). (As by the editing header, from stand...
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6 |
1964 |
05 Oct 2015 12:59 PM |
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1 |
1664 |
05 Oct 2015 12:44 PM |
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1 Replies and 2334 Views
radiometric calibration for NDVI 2334 1
Started by Deleted User
To calculate the NDVI, I calibrate the level of radiance or reflectance level , because the values are different, you must perform calibration
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1 |
2334 |
30 Sep 2015 04:49 PM |
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1 Replies and 2175 Views
brightness inversion (negative image) 2175 1
Started by Deleted User
I would like to generate a negative image using ENVI 5.3. Can anybody suggest me how to get a negative image.
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1 |
2175 |
29 Sep 2015 11:22 PM |
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3 Replies and 1428 Views
Problems about reading MERIS data 1428 3
Started by Deleted User
Hi all,
I met with a problem when reading MEARIS data. When I tired to open MERIS file by using
envi_open_data_file, filename, /envisat, r_fid=fid, only some auxiliary information can be found. In fact, if opened from GUI of ENVI, some more information can be seen in the 'available band lists'. Does anyone know what the reason is I guess there are a few of parameters missing when I use 'envi_open_data_file, filename, /envisat, r_fid=fid'. Thanks so much for your help!
'
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3 |
1428 |
23 Sep 2015 05:59 PM |
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2 Replies and 1698 Views
WV2 and FLAASH 1698 2
Started by Deleted User
Hi,
I'm trying to use FLAASH to atmospherically correct a WV2 image after using the radiometric calibration tool to format the image for FLAASH; however, when I input that image into FLAASH, it asks for an ascii file with wavelength and FWHM information. I don't see any ascii files in the imagery folders, and the metadata file doesn't work for this. What should I do Separately, is there another way to change radiance values to reflectance for WV2
Itiya
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2 |
1698 |
23 Sep 2015 10:00 AM |