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6 Replies and 65 Views LAI inbuilt spectral indices tool limitations  65  6 Started by  Yahampath Marambe I am using ENVI to produce LAI map series. ENVI use the following equation to calculate LAI. (Eq1) - LAI= (3.618*EVI) - 0.118 However, the value range of EVI is -1 to 1. Then the maximum value of LAI should be 3.50 according to the equation if EVI reaches to its maximum. Typically, ENVI gives LAI values greater than that value (3.50) also. Is ENVI using a higher upper limit for EVI than the typical range (-1 to 1) This equation also gives negative values for the LAI. I wo...
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by  Mari MinariJump to last post
19 Oct 2017 10:36 AM
0 Replies and 7 Views Trouble Verifying Account  7  0 Started by  Claire Leyden I received a verification e-mail, but when I click on it, I'm prompted to login. Once I login I receive the message 'You are using an unverified account. Please verify your account by clicking on the link contained in the verification email that has been sent to you.'
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13 Oct 2017 07:58 AM
5 Replies and 535 Views Access Denied - Verification Pending  535  5 Started by  Lisa Upton Why did I receive an "Access Denied - Verification Pending" error message
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by  Mari MinariJump to last post
24 Jul 2017 08:43 AM
5 Replies and 276 Views IDL batch export to tiff from problematic hdf files  276  5 Started by  PBreeze123 I have a large number of (nearly a thousand) rasters in .hdf (hdf4) format from the GLASS albedo product. Unfortunately there is a problem with the projection information/header data which means ARCGIS, GDAL, QGIS, SAGA, and GRASS all seem to have problems with the data/will not recognise the projection. This problem has been acknowledged by the product support team as a known issue, but will not be resolved until the next release, until which time they suggest manually editing the headers (see ...
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by  Mari MinariJump to last post
23 Jun 2017 08:44 AM
2 Replies and 269 Views Use of classification classes in ENVI Band Math  269  2 Started by  ahmad hmdan Hi, I have produced a crop map, and I need to calculate a number of biophysical variables using specific equations for specific crop class . I did it before using Matlab. But how can I do that using ENVI-Band math Thanks
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by  josh edwardsJump to last post
21 Jun 2017 03:59 AM
1 Replies and 405 Views  405  1 Started by  Jade Williams On your blog page you reference a column sort routine, and give a link to download it at: I am unable to access the site. Help please!
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by  Mari MinariJump to last post
17 Apr 2017 11:20 AM
20 Replies and 414 Views Regarding FLAASH correction  414  20 Started by  Bisma Qazi
(Topic has multiple pages1 2 )
Hi, I am trying to do atmospheric correction on AWiFS data onboard IRS-P6 using FLAASH module of ENVI 5.1. I have some doubts in the parameters that need to be inputted into the module. In the multispectral settings tab, there is an option for water reference channel, what does it mean Also an option for index to first band is there, If the value is set from 1 to 4, then it displays the following error message. 'filterfunctionfile'.sli doenot contain enough bands for the given input image. plea...
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by  Bisma QaziJump to last post
17 Apr 2017 03:37 AM
0 Replies and 236 Views Band Math  236  0 Started by  ahmad hmdan Hi, I would like to specify the Conditional Statements using Band math of Envi for this equation (Ln(1-(B1/b))) to avoid the NAN values. When B1 is equal to b then I got NAN values (ln (0)), because the real natural logarithm function ln(x) is defined only for x>0. Thanks
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15 Jan 2017 08:55 AM
1 Replies and 187 Views Band Math  187  1 Started by  Bisma Qazi How can i write this expression in ENVI band math r=(∑_i¦(x_i-x_m ) (y_i-y_m))/(√(∑_i¦(x_i-x_m ) ^2 ) √(∑_i¦(y_i-y_m ) ^2 ))
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05 Dec 2016 04:18 AM
3 Replies and 182 Views error in flaash of EO-1 Hyperision image  182  3 Started by  rajchandar padmanaban I am a user of ENVI5.2, Now I have a problem in dealing with Flaash. we want to use Flaash for our EO-1 hyperison image, the image has 179 bands after the pre-procession. and the faash always enconter an error after the process bar went to 58 done, the error shows: ACC error: h2oinv: h2oinv IDL error MOMENT: X error must contain 2 OR more elements. if I do not choose water retrieval, there is also an error: tile0.img, the process did not finish correctly I DO NOT know where the problem is,and...
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20 Oct 2016 05:46 AM
2 Replies and 184 Views PCA  184  2 Started by  Bisma Qazi Firstly,I would like to ask that why am I unable to access my previous posts. Secondly, I performed PCA on an image in ENVI and also in ERDAS. There was a huge difference between Eigen values and Eigen vector matrix computed in the two platforms. Why is it so Also, do the rows of the eigen vector matrix represent different PCS or original bands in ENVI. Say, for example, if I got a matrix like this Eigenvector Band 1 Band 2 Band 3 Band 4 Band 1 0.587621 0.598896 0.543896 ...
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10 Oct 2016 06:23 AM
1 Replies and 192 Views MTMF Result display  192  1 Started by  Rakesh Kumar Mishra I have classified an HSI image using MTMF method. The outputs are MF Score and Infeasibility for each class. I am trying to display all classes together in one image with different color for each class (similar to the SAM result). I am sure there should be a way in ENVI to display MTMF result where we can see all classes together with different color in one image. Can anyone please let me know how to do this Thanks you !
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14 Aug 2016 09:35 AM
6 Replies and 167 Views SAM classification using ASCII file  167  6 Started by  Samira Safaee We are trying to create a comprehensive spectral libraries for both 'soil' and 'salt' based on 8 study areas and use those spectral libraries in Spectral Angle Mapper algorithm in order to map the salt pans existed in the entire world. To do so we need to use ASCII files which contain only band values of each individual pixel in each band without location information. I have read that the right format for importing spectral information is the one that has 2 columns of number of bands and mea...
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02 May 2016 12:44 PM
1 Replies and 167 Views How do I change my password?  167  1 Started by  Lisa Upton How do I change my password
1 167
22 Jan 2016 02:43 PM
0 Replies and 147 Views login  147  0 Started by  Javier Corripio Exelis denies access because it is an unverified account (it used to work perfectly, as I have been using IDL for many years). To verify you need to follow a link that was never sent and the page does not give the option for requesting another verification link. Really poor, poor web security design. Anyone else having a similar problem
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06 Oct 2015 04:05 AM
0 Replies and 152 Views CAnt download IDL  152  0 Started by  Jošt Hobič When i go under downloads > all downloads in my account it is all empty and i cant download IDL or anything else. Whats wrong
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04 Oct 2015 09:33 AM
1 Replies and 136 Views Syntax error with FUNCTARGS  136  1 Started by  Mai Truong Hi, I'm new to IDL, and I'm trying to compile a .pro file in Exelis in my Mac OSX. I know that this code runs in other machines, but when I compile it, I get a syntax error message, which I don't know where to start looking to fix: Compiled module: FITCIRC_MPFIT_FUNC. FUNCTARGS={XPP:xpp&91sel&93,YPP:ypp&91sel&93,VLOS:vlos&91sel&93,AON:aon&91sel&93},$ ^ Syntax error. The part of the code with this problem is: for i=0,nn-1 do begin sel = Rind.(i...
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23 Jul 2015 02:30 PM
1 Replies and 146 Views IDL 7.1 operating system support  146  1 Started by  Kate Kear Can my older operating systems be updated to newer operating systems and support running IDL 7.1
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22 Jul 2015 11:51 AM
1 Replies and 161 Views Are ENVI and IDL supported on Windows 8 with touchscreen?  161  1 Started by  Mari Minari I am considering purchasing a new system that runs Windows 8 and has a touch screen. Can I use ENVI and IDL on this system and will it work with a touch screen
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13 Apr 2015 11:44 AM
2 Replies and 153 Views Digitalglobe data for research  153  2 Started by  Mamadou Coulibaly I am looking for high resolution data of the city of Abidjan, Ivory Coast (cote d'Ivoire). The data is to be used for research purposed only and I have no grant money at all to pay for it. Any idea where I could find it it or is there a Digitalglobe support for research activity. Thanks
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10 Apr 2015 05:58 PM
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