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1 Replies and 1898 Views
ENVI batch - rotate 1898 1
Started by Deleted User
I would like to use ENVI batch to rotate my images.
When I use ENVI to rotate the images the rotation angle is already in the rotation parameters. How do I write an ENVI batch program that will also do this automatically so that I do not have to enter a different angle for each image
Any feedback will be greatly appreciated.
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1 |
1898 |
23 Jul 2009 06:14 PM |
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1 Replies and 1749 Views
spectral resampling 1749 1
Started by Deleted User
Dear all,
I am trying to do spectral resampling from ASD field spectra to Hyperion data. I checked in ENVI spectral resampling module but I did not find Hyperion file in that. Could you please tell me is there any way to do this in ENVI Do you have any other suggestions
Thanks in advance,
Filiz
&160;
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1 |
1749 |
21 Jul 2009 11:37 PM |
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0 Replies and 1104 Views
use the function ENVI_FX_DOIT in VC or VB 1104 0
Started by Deleted User
I have a question.
I want to use the function "ENVI_FX_DOIT" in my own program for example VC 6 or VB.
what should I do&160;
may I compile the ".pro" file into dll to use this "pro" program
&160;
thank you in advance.
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0 |
1104 |
20 Jul 2009 07:12 PM |
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1 Replies and 1477 Views
how can i use gps points to resample spectral. 1477 1
Started by Deleted User
i have bunch of GPS points and they will supervise the next step's classifciation.
how can i input all the data and ask ENVI extracts the spectral automatically.&160; i'm wondering if any special data format for the ascii file
thanks.
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1 |
1477 |
20 Jul 2009 11:46 AM |
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0 Replies and 1210 Views
How to Calculate Zenith Angle for AVIRIS image? 1210 0
Started by Deleted User
Hi all,
Could anybody tell me how to calculate zenith angle for AVIRIS sensor I downloaded free data from JPL but do not know how to use data to compute zenith angle.
Any kind of feedback will be appreciated. Thanks in advance,
Lin
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1210 |
20 Jul 2009 11:22 AM |
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1 Replies and 2192 Views
How to get RPCs of a LANDSAT image? 2192 1
Started by Deleted User
Dear users,
I'm making a orthorectification with ENVI 4.5, but I don't have the RCPs. I would like to know if it is possible to get the RPC of a LANDSAT image somewhere.
Thank you so much
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1 |
2192 |
17 Jul 2009 04:53 AM |
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1 Replies and 1363 Views
Accuracy assessment - Confusion matrix - Selecting validation ROI's 1363 1
Started by Deleted User
Dear all,
&160;
I have performed a maximum likelihood classification on an ASTER image using ground truth ROI’s.
What I would like to do is validate the classified image, by using 95 of my ROI’s for the classification and 5 for the validation.
I have randomly selected 95 of my ROI’s (by generating a random sample of my ROI’s), but the problem is I need the other 5 for my validation. I made an image of the 95 ROI’s and tried to substract them to get the 5 , so that I can use that ...
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1 |
1363 |
14 Jul 2009 04:05 AM |
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0 Replies and 1167 Views
Accessing Multiple Cores with the Orthorectification Module 1167 0
Started by Deleted User
I have searched the forums but not found a solution to my problem.&160; I have a new processing machine with dual quad cores, but the Orthorectification module only accesses one core at a time.&160; It appeared to load balance on my dual core machine and the information on ENVI claims that the software makes use of multicore systems.&160; Does anyone have experience with this&160; Thanks in advance for your help!
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0 |
1167 |
08 Jul 2009 02:29 PM |
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0 Replies and 1668 Views
PARASOL image georeference 1668 0
Started by Deleted User
G'day - has anyone used ENVI to georeference a PARASOL satellite image
I have downloaded an aerosol daily orbit image file in native PARASOL format. The Lille University PARASOL visualisation tool can convert this file to HDF (although not, I think, a fully standard HDF). I have not yet had success in georeferencing this file so that I can insert it to ArcGIS.
Has anyone managed to georeference a PARSOL file - in its native format or its HDF form
regards Michael Hewson (The University of Qu...
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0 |
1668 |
07 Jul 2009 07:23 PM |
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0 Replies and 1615 Views
Evaluation of Image Classification software 1615 0
Started by Deleted User
Good day, i am research student working on d subject above.
Please i will want to know your expert views on Envi compared to Edras, Edras mapping and eCognition software on image classification.
I will also appreciate journals, websites or any information that can help me with my reseach
Email: deade115yahoo.com
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0 |
1615 |
07 Jul 2009 12:10 PM |
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1 Replies and 1855 Views
Maximum value composite expression 1855 1
Started by Deleted User
sorry, stupid question...
How to write&160;a band math expression for a maximum value composite (from a 3-band image I have to locate the maximum values for all pixels and&160;form&160;new image from those pixels) I tried expressions such as: MAX(b1,b2,b3) for the respective bands, but it returns a syntax error.
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1 |
1855 |
07 Jul 2009 09:43 AM |
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0 Replies and 1436 Views
Forest Health, Fire Fuel, Veg Stress Documentation 1436 0
Started by Deleted User
Hi All
Results from the Forest Health, Fire Fuel and Vegetation Stress functionalities of ENVI are not coming bad. But I am pressed for lack of documentation regarding their implementation in ENVI. Because while making presentation, I should not be vague!!
I request any details about their implementation, any papers. Specifically, I would like a flowchart or decision tree enumerating the steps used in bringing out the classification maps.
Thanks
Neeraj
TERI
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0 |
1436 |
06 Jul 2009 10:23 PM |
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1 Replies and 1404 Views
How to Use a Spectral Library with Missing Data 1404 1
Started by Deleted User
Hi all,
I am a green hand for ENVI and IDL. My problem is that I am using s06av95a_envi.sli spectral library (a resampled library for AVIRIS sensor from splib06 file) to analyze my endmembers. But not all spectra in that library file have reflectance data in all bands from 0.4 to 2.5 micrometers. Instead, a lot of spectra just have values in a subset of that region and have a '*' in other bands. After I used SAM classification, all the materials with missing data would have a score of zero du...
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1 |
1404 |
05 Jul 2009 10:21 PM |
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0 Replies and 1468 Views
How to get bright temperature? 1468 0
Started by Deleted User
How to get modis 1B 31th band bright temperature data with projection information&160; in ENVI&160; Thanks for your help!
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0 |
1468 |
05 Jul 2009 06:53 AM |
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3 Replies and 1246 Views
Parameters in ANN method using ENVI4.5 1246 3
Started by Deleted User
Dear users,
I am conducting a research about image classification using ANN method included in ENVI 4.5.
The ENVI4.5 offers users a friendly interface to fill out the parameters involved in the construction of an ANN. These parameters consist of activation, training threshold, training rate, momentum, number of hidden layers and number of training iterations etc. Unfortunately,&160; there is no information about the number of neurons per hidden layer. Actually, the number of neurons is consid...
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3 |
1246 |
05 Jul 2009 03:51 AM |
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1 Replies and 1612 Views
Spectral Hourglass Wizard 1612 1
Started by Deleted User
Hello
&160;
I am new to using ENVI. Am analyzing hyperion data using the spectral hourglass wizard and have some issues. Firstly, am getting an erroneous PPI image composed of white dots uniformy spaced in alternate rows. What can be the problem
Secondly, i don't know how to use the MTMF and SMA results for classification.
Lastly, in the last stage ENVI is not outputting the SAM results with an error message that says : Keyword VISIBLE_PTR not allowed in call to WIDGET_PMENU.
Thanks
Neer...
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1 |
1612 |
05 Jul 2009 01:53 AM |
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3 Replies and 1459 Views
Linear Spectral Unimixing 1459 3
Started by Deleted User
Hi there,
&160;
I&180;m trying to do a Linear Spectral Unimixing Analysis on a SPOT-5 image, which has 4 bands, for estimating impervious surfaces. After running the MNF rotation, only the three first bands are significant. According to the ENVI&180;s help, endmembers must be less than the number of bands. The problem is that, after analyzing the scatter plots, I&180;ve got up to 5 different endmembers, all of them necessary for the analysis.
&160;
Would the results be incorrect if I ru...
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3 |
1459 |
29 Jun 2009 01:45 AM |
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1 Replies and 1634 Views
Opening Mars THEMIS data in ENVI 4.6 1634 1
Started by Deleted User
Hello, There is displayed diagonal strips throughout the image. Also, in between the strips, the image itself is distorted, almost smeared and elongated, but still somewhat recognizable. I would appreciate any help that could be provided, I'm sure this is a small error. Thank you, ~Matt
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1 |
1634 |
26 Jun 2009 08:28 PM |
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1 Replies and 1979 Views
Continuum removal question. 1979 1
Started by Deleted User
Hi All,
I have a question regarding the continuum removal procedure implemented in ENVI. From the references (in particular CLARK et al. 1987 - "Automatic continuum analysis of reflectance spectra"), it sounds like continuum removal is performed by first detecting a set of local maxima within the spectrum, and then defining the continuum as a set of straight-line segments between local maxima. However, for spectra that are mostly concave (for instance, given a bowl-shaped spectrum wit...
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1 |
1979 |
26 Jun 2009 03:56 PM |
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1 Replies and 1405 Views
Resize_doit other results than resize 1405 1
Started by Deleted User
hi forum,
i've got a strange picture, when comparing the results of (i thought) identical processes. at the time, i resize my images in ENVI with Basic Tools - Resize Data (xfac=0.5; yfac=0.5; Pixel aggregate) to achieve an image with the double pixel size. because i try to automatize the process with resize_doit in envi batch mode.
&160;
envi_doit, 'resize_doit', $
fid=fid, pos=pos, dims=dims,$
interp=3,rfact=&912.,2.&93,$
out_name=out_name, r_fid=r_fid
&160;
&160;
if i now co...
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1 |
1405 |
26 Jun 2009 02:38 AM |