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0 Replies and 1458 Views
Random Sampling of ROI's 1458 0
Started by Deleted User
Hi,
Has anyone had used the random sampling tool much Once you have generated random samples from a single ROI is there a way to then separate those samples into 2 different ROI's that contain non-repeating pixels among the two I can generate two random samples from the same ROI, but some of the pixels overlap. I'm trying to save some time… hoping that I do not have to create the wheel (IDL code) on this one (lol)! If anyone has some suggestions or an old piece of code for this, I would...
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1458 |
12 Nov 2007 02:25 PM |
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1 |
1256 |
05 Nov 2007 11:17 AM |
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0 Replies and 1276 Views
problem with layer stacking 1276 0
Started by Deleted User
hi
i have a problem with layer stacking , when i link 3 images
one - i make with idl, second - i make with envi GUI interface
third - the input .tif file and i verify cursor location value , data in
corresponding pixels are not the same !
it s mean
.tif -> layer stacking with idl all is ok
.tif -> layer stacking with envi GUI not ok
(0 to max 8 error )
i make a screenshot ilustring my problem
http://rapidshare.com/files/65959833/layers.jpg.html
there are two iages , left ...
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1276 |
02 Nov 2007 11:41 AM |
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0 Replies and 1411 Views
How to fill gaps or Null value pixels using ENVI??? 1411 0
Started by Deleted User
I have a DTM and a particular tile in the DTM has null value surrounding it's North East West and South boundaries. Is there a tool in ENVI where i can process the DTM and fill the voids by interpolation or something
any Inputs are appreciated
thanks
varun
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0 |
1411 |
01 Nov 2007 10:15 AM |
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0 Replies and 1347 Views
bare soil extracting 1347 0
Started by Deleted User
Hi
I have ASTER image and want extrac a mask only the bare soil. I need a idea about tihis process. Thank you very much...
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0 |
1347 |
31 Oct 2007 11:50 PM |
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3 Replies and 2159 Views
0 Data to No Data? 2159 3
Started by Deleted User
How do you convert the perimeter of an image to 'no data' rather then '0'
Have tried applying a mast and changing 'mask value' to 'NaN' but the result is still '0'.
Thanks!
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3 |
2159 |
30 Oct 2007 10:59 AM |
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1 Replies and 1379 Views
combining DEM and CHRIS image 1379 1
Started by Deleted User
Dear anyone..I have a USGS SRTM DEM data and the corresponding satellite image. their data dimensions are slightly different..is thee any way to sort of drape or combine these two images so that I can get to display glacier from my image into the DEM
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1 |
1379 |
25 Oct 2007 07:25 AM |
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1 Replies and 1393 Views
image background 1393 1
Started by Deleted User
Bonjour,
Je travaille avec envi 4.1 et je voudrais changer la couleur de l'arrière plan de l'image( par defaut le logiciel me donne la couleur noire).
Merci beaucoup de votre aide car cela me permettra d'avoir des cartes mieux élaborées.
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1 |
1393 |
25 Oct 2007 05:38 AM |
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0 Replies and 1242 Views
Registering Air Photo 1242 0
Started by Deleted User
Hello. This should be a simple question but I'm rather new to the ENVI interface. I have a mosaicked aerial photo in TIFF format that is not georeferenced. I do have the associated .TFW file and the UTM zone so it can be loaded into ENVI. I also have both an ASTER and a LandSat TM image of the same scene. There seems to be an offset of about 200m between the aerial photo and both satellite images. I would like to link them to help me develop my ROIs for a supervised classification. I trie...
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1242 |
23 Oct 2007 08:36 AM |
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0 Replies and 1798 Views
sigma nought and beta nought 1798 0
Started by Deleted User
I want to use envi to do the radiation calibration of ers2 sar data, to convert DN value into db. But i have no dem data and acturally in my case i need not consider the error caused by topography. I noticed that the unit of beta nought is db. what's the difference between sigma nought and beta nought If i have no dem data, can i use beta nought to replace sigma nought
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0 |
1798 |
23 Oct 2007 08:26 AM |
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0 Replies and 1509 Views
Calibrating to Beta Nought (b0) 1509 0
Started by Deleted User
i use envi to do radiation calibration of ers sar data. I noticed that the beta nought's unit is db. what's the difference between beta nought and sigma nought if i have no dem data, can i use beta nought to replace the sigma nought
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0 |
1509 |
23 Oct 2007 08:25 AM |
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0 Replies and 1252 Views
spectral and spatial resampling 1252 0
Started by Deleted User
Hi,
I am trying to spectrally and spatially resample of HyMap hyperspectral image to ASTER image. Is it possible to do this by using ENVI Is there any tip to get the correct results
Thank you,
Filiz
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0 |
1252 |
23 Oct 2007 08:11 AM |
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1 Replies and 1659 Views
How to get the evaulation license 1659 1
Started by Deleted User
Hi all,
I am new to ENVI 4.3 and i would like to evaluate the new product. I have already obtained the ENVI 4.3 evaluation version from the download website. But i dont know where can i get the evaluation license. Could anyone please tell me where can i get the evaluation license
Thanks!
Cyril.
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1 |
1659 |
22 Oct 2007 08:16 AM |
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0 Replies and 1395 Views
Snow and Cloud separation in CHRIS 1395 0
Started by Deleted User
How do I get to separate snow and cloud usng ENVI in CHris dataI tried the Snow index and did (b3-b18)/(b3b18)...but the result was not a binary one. Since this CHRIS data only has wavelenght range from 0.4 to 1.05 microns...it has been giving me a hassle. I wish i could do something with this data. anyone..please help me. Peg..
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0 |
1395 |
19 Oct 2007 11:01 AM |
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0 Replies and 1308 Views
Statistics using evf 1308 0
Started by Deleted User
Hi:
I have a image (EVI) and a shape file. The shape file convert *.evf and want to take statistics
of data (EVI) from *.evf without using ROI for each poligon.
I want statistics of EVI for each poligon from *.evf file without generated ROI. Is possible to convert the *.evf file into ROI
Thank you very much..
Paulo J.
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0 |
1308 |
18 Oct 2007 01:05 PM |
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0 Replies and 1450 Views
spectral library for glaciers 1450 0
Started by Deleted User
Does anyone have any suggestion as to where I might find a spectral library for glaciers to use it in ENVI come on guys please help me..noone has replied any of my messages for ages.
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0 |
1450 |
18 Oct 2007 08:02 AM |
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1 Replies and 1790 Views
How to use The ASTER mineral ratios.sav 1790 1
Started by Deleted User
Hello Mr. Damien BARACHE
I'm research in the Institute of Informatics and Remote Sensing of the Mongolian academy of Sciences. My profession is a geodesy.
I'm installed the aster mineral ratios.sav. But I don't know to use this code Contribution file.
Please send me user guide of aster mineral ratios.sav file.
My e-mail address: batbayar_20012001yahoo.com
Kind Regards G. Batbayar
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1790 |
18 Oct 2007 01:53 AM |
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0 Replies and 1454 Views
snow reflectance 1454 0
Started by Deleted User
is there a way to normalize my reflectance spectal profile from snow data..becasue the reflectance value it is showing is way above one(which is not possible). this is a moungtainous data set..and the spectral profile really looks discontinuous even though this is a CHRIS image. why is that ..please tell me the answer...i have got my professor to extend my deadline to two weeks. ....pleeasssseee....
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1454 |
16 Oct 2007 12:50 AM |
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0 Replies and 1533 Views
anything 1533 0
Started by Deleted User
My problem is I am supposed to classify an image of K2 glacier...it is CHRIS data/ However, my proff. expects me to get creative out of this boring snow data. So can anyone suggest me how i should start and what I can classify in this image..i have to submit a 'creative' output within 10 days to get a distinction..any form of suggestion is appreciated. seriously what can one classify in snow and i do not even know which tools of ENVI are useful for me.
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0 |
1533 |
15 Oct 2007 08:00 AM |
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0 Replies and 1561 Views
OPEN PIX IN ENVI 1561 0
Started by Deleted User
I have a problem when opening an image landsat in format PIX. the projection of the image is UTM - WGS84 - Zona 18 the South.
When I open the image in ENVI my projection changes to UTM - WGS84 - Zona 18 North.
Somebody knows to that it must
Perhaps ENVI and PCI are not compatible
Greetings
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0 |
1561 |
13 Oct 2007 09:19 AM |