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1 Replies and 1187 Views spectrograph definition file - FWHM factor  1187  1 Started by  Deleted User I am unsure how to determine the FWHM factor required when creating a spectrograph definition file derived from the reference absorption feature. Is it based on the FWHM of the one specific channel where the absorption feature is centred Or is it based on the FWHM of the absorption feature itself, which spans more than one band
1 1187
23 Jul 2010 09:40 AM
3 Replies and 8253 Views How to merge single-band images into one multi-band image  8253  3 Started by  Deleted User Hi! Does ENVI has a tool for merging single-band images into one multi-band image I have LANDSAT MSS and TM data and I want all of the 4 and accordingly 7 bands to be merged into one file containing all bands. Otherwise I would have to do the mosaicking for every single band separately. Thanks in advance! Moana
3 8253
16 Jul 2010 08:25 AM
0 Replies and 828 Views Overlay on 3D surfaceview  828  0 Started by  Deleted User Hi Folks, I would like to know how to add overlay (e.g. grid, north arrow, scale bar, colorbar...) in the 3d surfaceview of ENVI. I found how to do that for contour lines, but not for features previously mentioned. Thank you for any feedback!
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15 Jul 2010 05:11 PM
0 Replies and 1010 Views Application of universal values reflect plant  1010  0 Started by  Deleted User Hello everyone, I' ve a question : Correlation between the value of reflection spectrum of popular handheld devices to measure the value of the object reflected in Optical Remote Sensing Thanks for sharing !
0 1010
15 Jul 2010 06:07 AM
2 Replies and 1328 Views Band Threshold to ROI  1328  2 Started by  Deleted User Hi everyone I want to know how can determinate Min Thresh Value and Max Thresh Value in the Band Threshold to ROI box. Already I determine value above from -20 to -3, but I don't know on base of which equation working this threshold. If somebody knows please tell me how can define Min and Max thresh value Please tell me with equation, because I need it on base of scientific solution. I will be please if you help me. Best Hadi
2 1328
15 Jul 2010 05:25 AM
0 Replies and 900 Views Automatic class labeling in Landsat using a spectral library?  900  0 Started by  Deleted User Is it possible thank you
0 900
14 Jul 2010 05:42 PM
1 Replies and 1014 Views How can extraction temperature of ASTER data?  1014  1 Started by  Deleted User Hi every one I have a question about ASTER data. I want to extract temperature from TIR bands but I don’t know how can proceed that in ENVI. Could you give me more details about this matter I will be appreciated if you help me Sincerely Yours, Hadi
1 1014
13 Jul 2010 07:34 PM
0 Replies and 1095 Views application spectrum reflected from the handheld device spectrometer ( GER 1500)  1095  0 Started by  Deleted User Hello everyone, I am doing research on the application spectrum reflected from the handheld device its spectrometer GER (GER 1500), I want to establish a correlation between the value function of the spectrometer with universal values of the reflectance spectrum is used images remote sensing (ASTER, AVNIR ...) I want to find those threads have been applied Appreciate your sharing ! :)
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13 Jul 2010 02:53 AM
0 Replies and 1010 Views Exact Tasseled Cap Transformation Matrix  1010  0 Started by  Deleted User Hi, I have done some research on Tasseled Cap recently, and I can easily find out the Transformation Matrix from ERDAS UI. So what about the exact Tasseled Cap Transformation Matrix used in Envi
0 1010
11 Jul 2010 09:07 PM
2 Replies and 888 Views subseting area of interest  888  2 Started by  Deleted User Good afternoon, i have remote sensing data on .tif format representing a very vast area and i have also my area of interest, which is included in the .tif data, in shapefile format. Is there any way by using the shapefile information to some how extract this specific area that i'm interested in in order to reduce the volume of data in ENVI Thank you for your time Stathis
2 888
05 Jul 2010 08:52 AM
1 Replies and 1001 Views From fid to array  1001  1 Started by  Deleted User Dear community, I have following problem. I want to stack two (or more) masks (each with three pixel values: 0,11 and 14) with the help of ENVIIDL. My testcode works at now with only 2 masks whose pixel-sizes and scene-sizes are different (for that reason the /EXCLUSIVE-command). The code works right until the last few lines. I want to get an three-dimensional array (img_stacked) with the two band-layers each with the same x and y dimension (the one from the bigger mask). I'm an IDL-beg...
1 1001
05 Jul 2010 08:33 AM
0 Replies and 1060 Views unsupervised classification and masking with evf.  1060  0 Started by  Deleted User Hello, I want to do an unsupervised classification and want to mask out certain areas that have no vegetation. I have these no vegetation areas in a evf. file. When I open the unsupervised classification for ISO I can put in select by subset BUT than it will only analyze the evf ROI and that's the opposite of what I want to do. When I hit mask band, the same thing happens it analyse only the areas in the evf file. How can I analyse all areas in the image EXCEPT for the areas in the evf ...
0 1060
04 Jul 2010 10:13 AM
4 Replies and 1169 Views Use a multispectral as panchromatic  1169  4 Started by  Deleted User Hello everyone ,this is my first post here and i would like to ask if there is a way to use a multispectral image as panchromatic.I have a QuickBird multispectral image and i want to use it as panchromatic.I am using band math to calculate the average of three bands and making a new image .I would like to know if the programm is taking the new image as panchromatic or multispectral. Thank you in regard.
4 1169
01 Jul 2010 04:43 AM
3 Replies and 1693 Views Topographic normalization  1693  3 Started by  Deleted User Dear users I'm wondering if someone of you has developed some adds for topographic normalization to eliminate shadowing present in mountainous satellite images. I need to eliminate these shadows to perform a more precise classification, but I'm unable to find a correct procedure on the net, and I haven't found any tools available on ENVI software to apply this kind process. Many thanks for any help and/or suggestions Enrico
3 1693
01 Jul 2010 03:56 AM
0 Replies and 1268 Views Neural Network majority-based pruning  1268  0 Started by  Deleted User Hi all I'm dealing with neural network classification with ENVI and I have to decrease the number of imput layers through MB pruning technique. I'm not familiar with this kind of classification. I don't find any tool/script in ENVI/IDL that allows me to apply such method. Is there anybody who can help me
0 1268
30 Jun 2010 01:48 AM
4 Replies and 1959 Views FLAASH PROCESSING OF LANDSAT TM  1959  4 Started by  Deleted User HI, I am very new to this forum, I am trying atmospherically correct Landsat TM using the FLAASH Module of ENVI. I ahve been getting some problem and need your suggestions 1. what should be a radiance scale factor, and whether it should be ally to all bands in one time or it should be implemented band by band. But I use this as 10 because I read it in some of posts in the forum. 2. In FLAASH parameters, I am confuse about Ground Elevation(km) what does that mean and I can not f...
4 1959
29 Jun 2010 10:20 AM
1 Replies and 1181 Views I have problem with DEM Extraction wizard  1181  1 Started by  Deleted User hi everybody Already I have ASTER data foe dem extraction and I have licenses, and I performed orthorectification. However, when I put left and right image to the diagram. I have error like ‘Error importing RPC coefficient parameter’. I do not know where problem is. I will be appreciated if somebody helps me. Thank you Sincerely yours, Hadi
1 1181
28 Jun 2010 11:27 PM
2 Replies and 1199 Views Problems opening MODIS MOD09GQ products  1199  2 Started by  Deleted User Dear alls, i am using ENVI 4.4 and have problems opening MOD09GQ products. Do you know how to open this hdf files. Many thanks, NTL
2 1199
27 Jun 2010 11:43 AM
4 Replies and 993 Views Duplicate ROI?  993  4 Started by  Deleted User Hello, I was wondering if anyone knows if ther is a way to duplicate an ROI, but in a different location in the same TIFF image I am trying to select 3 ROI's of equal area but it is impossible to do it manually, I can get close but not exact! I tried editing the pixel size in the ROI tool and it was a no go. I couldn't find anything in the help, so I'm hoping someone knows how to do such a thing. Thanks in advance!
4 993
24 Jun 2010 03:18 AM
1 Replies and 1220 Views PCA - select subset from eigenvalues  1220  1 Started by  Deleted User I am running PCA on 160-band data. Is there a way to select a non-contiguous subset of eigenvalues I don't just want the first 10 or so PCA bands, I want a set of individual bands (7, 10, 22, 34, etc.). I know I can spectrally subset the final output, but I want to perform an inverse transformation and I'm not sure how to exclude all of the other components. Thoughts
1 1220
23 Jun 2010 10:14 AM
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