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0 Replies and 1368 Views how to read SIR-C tar files  1368  0 Started by  Deleted User Hi, I found that USGS is distributing now SIR-C MLC images trough ftp (tar files). Is it any way arround to read such data to ENVI I think that the proper way it should be troug tape utilities but I have no clue how to force ENVI to read tar file instead of tape device. Does anybody faced with this problem already And/or maybe is aother way arround Any suggestions Thanks in advance! Zbigniew
0 1368
13 Jul 2006 09:10 AM
0 Replies and 1486 Views Multilook SIR-C data!  1486  0 Started by  Deleted User Hi there, I've been trying to multilook both single-look and multi-look complex SIR-C data with ENVI with no success. The problem appears when I wish to synthesize the .cdp file generated by the multi-look process. Although the number of rows and columns changes, the header of the new multilooked file is exactly the same as the original one. Does anybody know what happens with especially the offset as well as with the nr. rows and columns of the image when it is multilooked Any help will be...
0 1486
28 Jun 2006 01:18 PM
0 Replies and 1597 Views Using ENVI_SELECT in compiled idl program  1597  0 Started by  Deleted User Dear all, I created a program in which several ENVI routines are being used. It works fine as long as the source code has not been compiled. When I compile the program and call the .sav routine on another machine, it crashes when I select a file. Files are being selected using ENVI_SELECT. The failure message is the following: Variable is undefined: E_INVISIBLE_FLAG (ENVI_GLOBALS1_COMMON). Execution halted at: ENVI_ENTER_FILE ENVI_OPEN_FILE ...
0 1597
12 Jun 2006 11:33 AM
0 Replies and 1692 Views MNF-transform field spectra  1692  0 Started by  Deleted User have some field spectra that was collected with a ASD field spectrometer. I want to be able to use this data as endmembers for classifying a Hymap image. Problem is the Hymap is MNF-transformed, and the field spec is in reflectance. Its easy to transform an image, but I cant figure out how to MNF-transform a spectral library signature. Anybody have any ideas for this - CHarlie F
0 1692
12 Jun 2006 05:06 AM
0 Replies and 1553 Views ndvi  1553  0 Started by  Deleted User Hello, I am trying to compute the ndvi of a landsat picture dataset by using ENVI 3.5 i am using band 4 and 3 by using the bandmath tool in the envi menu but it seems the result is not correct to me (i have compared with ER MAPPER results), i maybe forget to do something while i am loading the bands someone could help me I thank you very much, nicolas
0 1553
09 Jun 2006 05:06 AM
0 Replies and 1482 Views Changing Class code  1482  0 Started by  Deleted User Hi I have a classified file with few classes. Each class has a code- Is it possible to change the class code (for example from class code 2 to 4...). Thanks Gil
0 1482
06 Jun 2006 08:15 AM
0 Replies and 1578 Views Command line saving of metafiles?  1578  0 Started by  Deleted User I'm trying to hunt down the IDL code to save a set of files as an envi metafile -- any ideas on how I do this
0 1578
05 Jun 2006 07:49 PM
2 Replies and 1851 Views Image enhancement techniques  1851  2 Started by  Deleted User Greetings! I am currently looking into the various image enhancement tools available in ENVI and would appreciate if someone can give me guidance. I have a set of satellite images and there are some situations where I need to perform enhancement. They are: 1. Areas that are covered by cloud shadows and need to be dodged to bring out the features 2. Areas that are over-exposed and need to be 'darkened' 3. Adjacent images in which one is taken on a 'misty' day while the other is tak...
2 1851
04 Jun 2006 09:53 PM
0 Replies and 1562 Views import text layer from mapinfo 2 envi  1562  0 Started by  Deleted User i want to import layrs with text from mapinfo table to envi. to superposed this text, wich are the toponimy, to an image thank's
0 1562
29 May 2006 08:47 AM
0 Replies and 1607 Views importer du text à partir d'une table mapinfo  1607  0 Started by  Deleted User salut je veut importer une table mapinfo de toponimie sur ENVI càd une couche ou se trouve du text mai je ne peu po le faire mai pour les vecteur càd les ligne ya po de pb j'aimerai bien ke j'aurai la répense sur mon émail et merci
0 1607
29 May 2006 07:33 AM
0 Replies and 1585 Views help for stitching SRTM images together  1585  0 Started by  Deleted User I m working on SRTM tiles and I m trying to stitch 6 of them together. Therefore I m using the Mosaicking option in Envi. The problem is that I just arrive to stitch 2 georefernced tiles together (1401x1201 pixels)and not all the 6 of them (2401x3601 Pixels). It s possible for me to stitch them together in the pixelbased mode but I need the georeferenced mosaicking. Maybe there is just a parameter to change, but whichHow can I do
0 1585
26 May 2006 07:43 AM
2 Replies and 1753 Views help for stitching SRTM images together  1753  2 Started by  Deleted User I m working on SRTM tiles and I m trying to stitch 6 of them together. Therefore I m using the Mosaicking option in Envi. The problem is that I just arrive to stitch 2 georefernced tiles together (2401x1201 pixels)and not all the 6 of them (2401x3601 Pixels). It s possible for me to stitch them together in the pixelbased mode but I need the georeferenced mosaicking. Maybe there is just a parameter to change, but whichHow can I do
2 1753
26 May 2006 07:43 AM
0 Replies and 1622 Views Supervised classification  1622  0 Started by  Deleted User Can I apply the rules learned from the ROIs in one image to different images How can this be done Thanks a lot.
0 1622
25 May 2006 06:10 PM
0 Replies and 1582 Views Spilt Images  1582  0 Started by  Deleted User I have a image from a state and i want to split this image in other ones delimited buy the boundaries of the counties. It is possible in ENVI
0 1582
22 May 2006 12:06 PM
1 Replies and 1849 Views Bad Line Correction  1849  1 Started by  Deleted User Dear Friends, I have a pushbroom hyperspectral imaging system, which scans from 1000 to 1800 nm. The camera is equipped with an InGaS detector array of size 320 x 243 (spatial x spectral); and it has about 2 bad pixels. So, in the hyperspectral image, for each bad pixel, I am getting a bad line. The location of bad line varies from one band to the other and some of them are visible only at particular band. I tried to run PCA. But it couldn't get through because the image had -NaN valu...
1 1849
22 May 2006 11:35 AM
0 Replies and 1515 Views ROC Curve analysis  1515  0 Started by  Deleted User Hello Before I classify my hyperspectral image i pull up my training ROIs and reconcile them to the original image and then perform max likelihood classification after that I pull up my testing ROIs and reconcile them to my classified image and then I go to post classification (ROC CURVES) but for some reason it wont bring up my testing files in add the combination ( my input parameters are input file is selected as the original image and the ground truth img is the classified image as it wont...
0 1515
11 May 2006 10:50 AM
0 Replies and 1784 Views rotate/transpose the hyperspectral image  1784  0 Started by  Deleted User Hi group: I have a hyperspecttal image (x,y,l). I want to transpose this 3D matrix such that the resulting image is (x, l, y). That is, one spatial axis became spectral axis and vice versa. How can I do this in ENVI or IDL Thanks in advance. Jeyam.
0 1784
08 May 2006 09:09 AM
0 Replies and 1697 Views questions about segmentation theory  1697  0 Started by  Deleted User hello i need some explains about 'segmentation image' from 'basic tools' menu 1. i was looking at help and meet 'DN value'. What is this 2. does i need make segmentation before classification or after classification why segmentation included in 'post classification' menu thanks at advance
0 1697
05 May 2006 11:53 AM
0 Replies and 1575 Views Using ENVI for Hyperion corrections  1575  0 Started by  Deleted User Hi, I'm trying to correct a few Hyperion images from Radiance to Reflectance. I'm using ENVI 4.2 and FLAASH. I've read a few hands-on processing instructions that i got from the internet, but none seem to give me accurate results. Anybody know if there is a full processing outline for Hyperion processing with ENVI out there thanks
0 1575
05 May 2006 09:54 AM
0 Replies and 1670 Views Tree Counting  1670  0 Started by  Deleted User Any possible way to do tree counting technique or any commercial tools that can i purchase for it
0 1670
28 Apr 2006 06:32 PM
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