X
Search this forum:
Search
You are not authorized to create a new topic
Page 36 of 137 << < 3435363738 > >>
Topics
 Replies
 Views
 Last Post
4 Replies and 1462 Views Optimized Linear Stretch  1462  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
4 1462
02 Sep 2014 02:25 PM
1 Replies and 1285 Views NDVI  1285  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
1 1285
02 Sep 2014 07:18 AM
1 Replies and 1138 Views Using SPEAR relative water dpeth wizard with DN  1138  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...
1 1138
31 Aug 2014 09:57 PM
1 Replies and 1484 Views DEM extraction from Landsat??  1484  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
1 1484
29 Aug 2014 02:23 AM
8 Replies and 1529 Views Regarding Gram schmidt sharpening  1529  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
8 1529
26 Aug 2014 10:43 PM
1 Replies and 1385 Views Envi/IDL Versions  1385  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.
1 1385
26 Aug 2014 09:38 PM
3 Replies and 1420 Views Image to image equalization  1420  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
3 1420
25 Aug 2014 02:47 AM
1 Replies and 1350 Views data for Vegetation Index calculator  1350  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
1 1350
25 Aug 2014 02:04 AM
3 Replies and 1479 Views Envi Feature Extraction  1479  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...
3 1479
25 Aug 2014 12:51 AM
1 Replies and 2551 Views Landsat 7 destriping  2551  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...
1 2551
24 Aug 2014 10:12 PM
1 Replies and 3925 Views Convert from 16 bit pixel depth to 8 bit pixel depth  3925  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...
1 3925
21 Aug 2014 07:06 AM
1 Replies and 1348 Views FLAASH error: acc_called_t5set  1348  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: "*****************&...
1 1348
19 Aug 2014 01:36 AM
4 Replies and 1589 Views &39;Parts&39; Attribute after &39;Classification to Vector&39; conversion  1589  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
4 1589
18 Aug 2014 01:13 AM
1 Replies and 1462 Views Using ENVI_GEOREF_FROM_GLT with a SuperGLT  1462  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...
1 1462
15 Aug 2014 05:10 PM
0 Replies and 1401 Views Cancelled  1401  0 Started by  Deleted User Disregard
0 1401
14 Aug 2014 10:13 AM
5 Replies and 2789 Views Landsat 8  2789  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
5 2789
07 Aug 2014 07:43 AM
1 Replies and 1243 Views color infraread imagery  1243  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
1 1243
31 Jul 2014 12:56 PM
0 Replies and 1463 Views Using band mask in SVM classification and help with threshold parameter  1463  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...
0 1463
25 Jul 2014 04:14 AM
1 Replies and 1443 Views Band Math Help  1443  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.
1 1443
23 Jul 2014 05:54 PM
4 Replies and 1651 Views Georeference SPOT 6  1651  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.
4 1651
15 Jul 2014 07:37 AM
You are not authorized to create a new topic
Page 36 of 137 << < 3435363738 > >>