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0 Replies and 1309 Views Random Sampling of ROI's  1309  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...
0 1309
12 Nov 2007 02:25 PM
1 Replies and 1081 Views Does I need to apply FLASH Atmospheric Correction Module to Multispectral Data obtained through MASTER Airborne Simulator?  1081  1 Started by  Deleted User Hi Dears: Has any body corrected MASTER sensor data using FLASH module My data has Moderate Haze. Regards,
1 1081
05 Nov 2007 11:17 AM
0 Replies and 1149 Views problem with layer stacking  1149  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 ...
0 1149
02 Nov 2007 11:41 AM
0 Replies and 1212 Views How to fill gaps or Null value pixels using ENVI???  1212  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
0 1212
01 Nov 2007 10:15 AM
0 Replies and 1196 Views bare soil extracting  1196  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...
0 1196
31 Oct 2007 11:50 PM
3 Replies and 1924 Views 0 Data to No Data?  1924  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!
3 1924
30 Oct 2007 10:59 AM
1 Replies and 1224 Views combining DEM and CHRIS image  1224  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
1 1224
25 Oct 2007 07:25 AM
1 Replies and 1232 Views image background  1232  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.
1 1232
25 Oct 2007 05:38 AM
0 Replies and 1099 Views Registering Air Photo  1099  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...
0 1099
23 Oct 2007 08:36 AM
0 Replies and 1636 Views sigma nought and beta nought  1636  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
0 1636
23 Oct 2007 08:26 AM
0 Replies and 1329 Views Calibrating to Beta Nought (b0)  1329  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
0 1329
23 Oct 2007 08:25 AM
0 Replies and 1097 Views spectral and spatial resampling  1097  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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23 Oct 2007 08:11 AM
1 Replies and 1511 Views How to get the evaulation license  1511  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.
1 1511
22 Oct 2007 08:16 AM
0 Replies and 1229 Views Snow and Cloud separation in CHRIS  1229  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..
0 1229
19 Oct 2007 11:01 AM
0 Replies and 1142 Views Statistics using evf  1142  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.
0 1142
18 Oct 2007 01:05 PM
0 Replies and 1295 Views spectral library for glaciers  1295  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.
0 1295
18 Oct 2007 08:02 AM
1 Replies and 1627 Views How to use The ASTER mineral ratios.sav  1627  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
1 1627
18 Oct 2007 01:53 AM
0 Replies and 1291 Views snow reflectance  1291  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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16 Oct 2007 12:50 AM
0 Replies and 1368 Views anything  1368  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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15 Oct 2007 08:00 AM
0 Replies and 1359 Views OPEN PIX IN ENVI  1359  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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13 Oct 2007 09:19 AM
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Page 116 of 137 << < 114115116117118 > >>