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4 Replies and 1482 Views
Optimized Linear Stretch 1482 4
Started by Deleted User
Hello
I need to save a full fusioned and orthorectified SPOT-6 16 bit-image with the optimized linear stretch applied without loss of radiometric or spatial resolution. I looked up the ENVI 5.1 help and I found a way using "chip view to" but there was loss in the resulting image. I also tried to export using the "Save as" from the Image window of ENVI Classic but I could not find the Optimized Linear Stretch available. Can anyone help me
Orlando
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4 |
1482 |
02 Sep 2014 02:25 PM |
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1 Replies and 1306 Views
NDVI 1306 1
Started by Deleted User
Salut
je travaillle avec une serie de NDVI (layer stacking) je veux determiner MIN and MAX and Mean pour la serie pour calculer VEGETATION CONDITION INDEX (VCI)
Merci d'avance
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1 |
1306 |
02 Sep 2014 07:18 AM |
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1 Replies and 1162 Views
Using SPEAR relative water dpeth wizard with DN 1162 1
Started by Deleted User
Could anyone give me the heads up on why I might be getting better results using Landsat 5 DN files than radiometrically and atmospherically corrected Landsat files. The example of the tool use by David Huslander ( A quantitative comparison of Traditional and image derived bathymetry...") includes this preprocessing before running the tool. However when I run the tool with preprocessed files the results show no sensitivity to depth, while just including raw DN files produces a much bette...
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1 |
1162 |
31 Aug 2014 09:57 PM |
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1 Replies and 1502 Views
DEM extraction from Landsat?? 1502 1
Started by Deleted User
Hi all!
I've been looking through the landsat 7 and 8 images for a while and was just wondering, if it is possible at all to extract a DEM from landsat images My initial hunch says no. Although there is slight offset of those images, but the angle seems too small to be able to extract terrain info.
Any ideas
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1 |
1502 |
29 Aug 2014 02:23 AM |
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8 Replies and 1552 Views
Regarding Gram schmidt sharpening 1552 8
Started by Deleted User
Hi all, I'm looking to pansharpen a Landsat 7 imagery using its multispectral 30m and panchromatic 15 m bands. I started up GS sharpening tool and input the relevant files and subsets. Upon pressing OK, there is no progress bar appearing. Instead, the 'PansharpGSS' text is constantly appearing in the bottom right hand status.
I have waited for half an hour or so, but there is still no result.
Anyone has any idea on what is wrong here
Thanks!
Regards
Corse
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8 |
1552 |
26 Aug 2014 10:43 PM |
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1 Replies and 1402 Views
Envi/IDL Versions 1402 1
Started by Deleted User
I've been trying to find what versions of IDL was included with what version of ENVI. The program I'm writing requires IDL 7.0 and I need to determine if that is acceptable for our users.
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1 |
1402 |
26 Aug 2014 09:38 PM |
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3 Replies and 1441 Views
Image to image equalization 1441 3
Started by Deleted User
Hi all
I have two images, one from Landsat 7 and one from Landsat 8. Due to the time of acquisition, the intensities for each are different. Is there any module in Envi that allows me to adjust the radiometric fidelity of one image in reference of another
Thanks!
Regards
Corse
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3 |
1441 |
25 Aug 2014 02:47 AM |
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1 Replies and 1376 Views
data for Vegetation Index calculator 1376 1
Started by Deleted User
How is it possible to get input data for the vegetation index calculator in ENVI for Asian country
Other than AV IRIS data, from which data is it possible to conduct all the indices available at ENVI
Could any one suggest for downloading data required for this calculator
shambhu paudel
Nepal
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1 |
1376 |
25 Aug 2014 02:04 AM |
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3 Replies and 1495 Views
Envi Feature Extraction 1495 3
Started by Deleted User
I have a question about the fuzzy tolerance and calculating the left and right border for the S-type membership function. If I use the default fuzzy tolerance as 0.05, how the left and right borders for “LT”, “GT” and “IB” can be manually calculated.
For the value of less than (LT) 16.881, How can I calculate a and c for left and right borders
In case of “IB”, I have an attribute with a range of &91-0.2569, -0.1082&93, how should I calculate the...
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3 |
1495 |
25 Aug 2014 12:51 AM |
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1 Replies and 2587 Views
Landsat 7 destriping 2587 1
Started by Deleted User
Hi all ! I'm new to processing of LANDSAT 7 imagery and have read up on the SLC-off issues in the images. I followed the link here (https://www.exelisvis.com/Support/HelpArticlesDetail/TabId/219/ArtMID/900/ArticleID/9800/1311.aspx) for the destriping of landsat 7 imagery. I believe I have to download the Dong Yanqing's destripe tool for Landsat 7. However, I am unable to find the download link of the tool. Are there any way of getting the destripe tool or alternative
Thank you in advance!
Rega...
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1 |
2587 |
24 Aug 2014 10:12 PM |
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1 Replies and 3955 Views
Convert from 16 bit pixel depth to 8 bit pixel depth 3955 1
Started by Deleted User
Hi,
I'm new to Envi and don't have much experience in image processing.
I have a 16 bit image that has 3 bands and a maximum DN of 1362, 1451 and 2114 in the 3 bands.
These values seem very low to me given that the maximum possible value would be 65536 in a 16 bit image.
I'm having some problems with this image, one of which is its size on disk. Would it make sense to convert the image to 8 bit and somehow scale down the DNs in the three bands to a representative value in the 0-255 range
If s...
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1 |
3955 |
21 Aug 2014 07:06 AM |
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1 Replies and 1373 Views
FLAASH error: acc_called_t5set 1373 1
Started by Deleted User
Hi,
I'm processing GOCI (Geostationary Ocean Color Imager launched by Korea) radiance data, and tried to use FLAASH to correct atmospheric effects.I know there are some requirements of the data format by FLAASH, so I converted the radiance data type to float, convert BSQ to BIL, correct the image coordinates.
FLAASH failed and the following error poped up:
ACC error: acc_called_t5set:read tape5 back in to check format.
IDL error:
Unable to apply format code F to input: "*****************&...
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1 |
1373 |
19 Aug 2014 01:36 AM |
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4 Replies and 1613 Views
&39;Parts&39; Attribute after &39;Classification to Vector&39; conversion 1613 4
Started by Deleted User
After parallelpiped classification of a SPOT2.5m image in ENVI classic, i used the option: 'Post Classification > Classification to Vector'. The vector file i obtain has certain attributes i.e., Length, Area, and Parts. I want to ask what do you mean by 'Parts' attribute, how ENVI calculate it
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4 |
1613 |
18 Aug 2014 01:13 AM |
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1 Replies and 1479 Views
Using ENVI_GEOREF_FROM_GLT with a SuperGLT 1479 1
Started by Deleted User
I'm trying to use the IDL 8.3 CLI interface on Linux to have ENVI create a GLT and GeoRef image to export to a GeoTIFF. I'm primarily using the functions ENVI_GLT_DOIT and ENVI_GEOREF_FROM_GLT_DOIT.
I was able to get this working using the following code:
e = ENVI(/HEADLESS)
geo_raster = e.OpenRaster("/path/to/locationFile.dat")
data_raster = e.OpenRaster("/path/to/dataFile.dat")
geo_fid = ENVIRasterToFID(geo_raster)
data_fid = ENVIRasterToFID(data_raster)
E...
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1 |
1479 |
15 Aug 2014 05:10 PM |
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0 Replies and 1421 Views
Cancelled 1421 0
Started by Deleted User
Disregard
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0 |
1421 |
14 Aug 2014 10:13 AM |
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5 Replies and 2823 Views
Landsat 8 2823 5
Started by Deleted User
Hi,
I am having trouble opening Landsat 8 images in ENVI when trying to open as GeoTIFF with Metadata using the _MTL.txt file. I have tried in ENVI 5.0 and get the error: Unable to recognise the file type of the input, as well as ENVI Classic which gives me the error: Array dimensions must be greater than 0. I would also like to calibrate the data (once opened) in order to view radiance/reflectance values as opposed to DNs. Is this possible for Landsat 8 in any version of ENVI
Thanks
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5 |
2823 |
07 Aug 2014 07:43 AM |
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1 Replies and 1281 Views
color infraread imagery 1281 1
Started by Deleted User
I've downloaded Landsat 7 imagery, but the bands are displayed as separate files. I want to view a 5-4-3 band combo for a color infrared image, but I get a message saying I can't create a layer from multiple files. I'm brand new at this and would appreciate knowing what I'm doing wrong.
Thank you,
Dominique
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1 |
1281 |
31 Jul 2014 12:56 PM |
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0 Replies and 1491 Views
Using band mask in SVM classification and help with threshold parameter 1491 0
Started by Deleted User
Hi there,
I am working on classification of plant species from hyperspectral imagery. I have found support vector machine (SVM) classification to be very efficient in this task. However the problem is that there is no possibility to select a Mask band in the Classification input file window. For example Spectral angle mapper has this possibility in the same window. Is there any way to use a mask band with SVM classification in ENVI
Additionally there is some confusion the Exelis documentary a...
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0 |
1491 |
25 Jul 2014 04:14 AM |
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1 Replies and 1464 Views
Band Math Help 1464 1
Started by Deleted User
I want to enter this formula in mathematics bands in ENVI:
PCP = b1 (true) and b3 (true) and b3 (true) and b4 (true)
please help.
Deseo ingresar esta formula en ENVI en matematica de bandas:
PCP = b1(true) and b3(true) and b3(true) and b4(true)
por favor ayudarme.
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1 |
1464 |
23 Jul 2014 05:54 PM |
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4 Replies and 1682 Views
Georeference SPOT 6 1682 4
Started by Deleted User
Hi everyone,
I have a problem when I want to geroreference a SPOT6 image (Original format: *.dimap,xml) with ENVI 5.1. The problem is that I need a leader file (*.dat) that I haven't. Anyone know where to find this file.
P.D. I have the rpc file but in xml format.
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4 |
1682 |
15 Jul 2014 07:37 AM |