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0 Replies and 1295 Views Random Sampling of ROI's  1295  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 1295
12 Nov 2007 02:25 PM
1 Replies and 1063 Views Does I need to apply FLASH Atmospheric Correction Module to Multispectral Data obtained through MASTER Airborne Simulator?  1063  1 Started by  Deleted User Hi Dears: Has any body corrected MASTER sensor data using FLASH module My data has Moderate Haze. Regards,
1 1063
05 Nov 2007 11:17 AM
0 Replies and 1137 Views problem with layer stacking  1137  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 1137
02 Nov 2007 11:41 AM
0 Replies and 1189 Views How to fill gaps or Null value pixels using ENVI???  1189  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 1189
01 Nov 2007 10:15 AM
0 Replies and 1182 Views bare soil extracting  1182  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 1182
31 Oct 2007 11:50 PM
3 Replies and 1875 Views 0 Data to No Data?  1875  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 1875
30 Oct 2007 10:59 AM
1 Replies and 1210 Views combining DEM and CHRIS image  1210  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 1210
25 Oct 2007 07:25 AM
1 Replies and 1215 Views image background  1215  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 1215
25 Oct 2007 05:38 AM
0 Replies and 1084 Views Registering Air Photo  1084  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 1084
23 Oct 2007 08:36 AM
0 Replies and 1618 Views sigma nought and beta nought  1618  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 1618
23 Oct 2007 08:26 AM
0 Replies and 1301 Views Calibrating to Beta Nought (b0)  1301  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 1301
23 Oct 2007 08:25 AM
0 Replies and 1080 Views spectral and spatial resampling  1080  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
0 1080
23 Oct 2007 08:11 AM
1 Replies and 1491 Views How to get the evaulation license  1491  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 1491
22 Oct 2007 08:16 AM
0 Replies and 1212 Views Snow and Cloud separation in CHRIS  1212  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 1212
19 Oct 2007 11:01 AM
0 Replies and 1123 Views Statistics using evf  1123  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 1123
18 Oct 2007 01:05 PM
0 Replies and 1280 Views spectral library for glaciers  1280  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 1280
18 Oct 2007 08:02 AM
1 Replies and 1617 Views How to use The ASTER mineral ratios.sav  1617  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 1617
18 Oct 2007 01:53 AM
0 Replies and 1276 Views snow reflectance  1276  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....
0 1276
16 Oct 2007 12:50 AM
0 Replies and 1354 Views anything  1354  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.
0 1354
15 Oct 2007 08:00 AM
0 Replies and 1339 Views OPEN PIX IN ENVI  1339  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
0 1339
13 Oct 2007 09:19 AM
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Page 116 of 137 << < 114115116117118 > >>