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1530 |
30 Mar 2015 12:16 PM |
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5 Replies and 1972 Views
Calling ENVI in a Function 1972 5
Started by Deleted User
Hi all,
I'm trying to call ENVI in an IDL procedure. When I type "e = ENVI()" as is reccomended on this tutorial on a newly started IDL session, ENVI start up. However, if I open a session where I've tested some scripts I'm trying to run, I usually get the following error:
^
Syntax error.
If I call ENVI as a function as I've seen in other examples, the same script will say ENVI is not a defined function. What could I be doing wrong
Thanks!
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5 |
1972 |
27 Mar 2015 01:30 PM |
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6 Replies and 1784 Views
Opening IMG dem error 1784 6
Started by Deleted User
I have several lidar DEMs in img format with no header info. When I try to open them in ENVI I get an error that ENVI can't open ERDAS files, which I assume is because it has no header. How do I either 1. create a header for a lidar dem or 2. convert the filetype into something it will open
I don't have ENVI lidar so that's not an option unfortunately.
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6 |
1784 |
26 Mar 2015 06:19 AM |
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1 Replies and 1318 Views
Aster 1b mosaic - convert to radiance 1318 1
Started by Deleted User
Hi
I have a set of Aster 1b images that I have corrected using quac, layer stacked and mosaicked. In the data manager after the Quac and layer stacking the bands are still refered to as Aster bands - for example - Layer (QUAC(Aster VNIR Band2:Prdat011.dat)etc. However I not note that after I have mosaicked the images they are not called aster bands anymore - for example Band1 (0.5560). I know that there is no need to convert aster 1b data to radiance because envi does it automatically but ...
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1318 |
25 Mar 2015 03:51 PM |
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3 Replies and 1499 Views
Rx algorithm 1499 3
Started by Deleted User
Hello everyone,, I'm working on Rx Anomaly Detection,, I'm using hyperion datacube,, I just loaded the data and ran Rx Anomaly detection in envi. I'm getting output but its not matching with the theory what i have read before applying the algorithm. I know i'm missing something very basic. So please can anyone tell me how it works (bottom to top explanation) or suggest me some material to read. Thank you
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3 |
1499 |
24 Mar 2015 11:48 PM |
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1 Replies and 1520 Views
How to remove scan line noises 1520 1
Started by Deleted User
After calculating the emissivity values for ASTER thermal bands using Temperature-Emissivity Separation(TES) algorithm some sub-horizontal noises are appearing in the image. Are they the scan line noises of ASTER thermal scanner If it is so, how to remove those noises
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1520 |
24 Mar 2015 05:16 AM |
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1 Replies and 1438 Views
Unable to find ENVI Tools in ArcGIS 1438 1
Started by MariM
I installed ENVI and ArcGIS but when I open ArcGIS, I do not see the ENVI Tools. Why is this
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1438 |
23 Mar 2015 01:10 PM |
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7 Replies and 1692 Views
Endmember collection 1692 7
Started by Deleted User
When I am using SAM(Spectral Angle Mapper), while collecting the spectral endmembers or importing the spectra from an ASCII file for a single mineral, where does the no. of bands comes from For a single mineral there are so many bands! Please note that I am using the thermal bands of the ASTER data for my work. Also why is status showing as "Invalid"
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7 |
1692 |
19 Mar 2015 05:43 AM |
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1 Replies and 1442 Views
flaash error 1442 1
Started by Deleted User
apply flaash correction in hyperion data then reflectance value minus(-).
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1 |
1442 |
19 Mar 2015 03:04 AM |
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1 Replies and 1561 Views
applying a mask to thermal atmospheric correction 1561 1
Started by Deleted User
Hi
I have 11 Aster 1b images. I have applied the thermal atmospheric correction tool to the TIR bands for each image, but unlike the atmospheric correction tool for SWIR and VNIR bands I cannot mask out the black surrounds. So after I apply the TAC I get negative values for the black surrounds. I then wish to mosaic the images using seamless mosaic, but because the black surrounds have now been "corrected" they are no longer 0 so I can not use this as the data ignore value. Please...
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1561 |
19 Mar 2015 12:06 AM |
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1 Replies and 2180 Views
Thermal Atmospheric correction- Aster 2180 1
Started by Deleted User
Hi
Using the thermal atmospheric correction tool for Aster TIR bands what scale factor do I apply please
thanks
Alison
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1 |
2180 |
18 Mar 2015 11:00 PM |
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3 Replies and 1663 Views
AVIRIS Radiance to Reflectance w/out FLAASH or QUAC 1663 3
Started by Deleted User
What procedures can I use to convert my AVIRIS data from radiance to reflectance I remember doing this years ago with ENVI's precursor SIPS. Thoughts
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3 |
1663 |
18 Mar 2015 01:04 PM |
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2 Replies and 1688 Views
Ano maly detection 1688 2
Started by Deleted User
Hi,, I'm trying to process a Hyperspectral image for target detection but when i run the 'Anomaly Detection Workflow' I'm getting a error like your Covariance matrix is singular. What may be the reason am I missing something How can i correct it
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2 |
1688 |
17 Mar 2015 03:30 AM |
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3 Replies and 1707 Views
TIFF to ENVI 1707 3
Started by Deleted User
Hello,
I have hundreds of TIFF files downloaded that I need to convert to ENVI format with a header. Files range from 1-6 bands. Is there an easy way to do this I tried working up an IDL code but couldn't figure it out-- it seems like there must be an easier way than opening the file in ENVI and clicking "Save As" hundreds of times.
Appreciate the help.
Cheers,
bw
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3 |
1707 |
17 Mar 2015 01:51 AM |
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1 Replies and 1335 Views
Opening downloaded ASU spectral library 1335 1
Started by Deleted User
I have downloaded the spectral signatures of some minerals from the ASU spectral library in ASCII(zipped) format. After extracting the file how to open the spectral signature in ENVI. After extracting the file there are two files naming "common" and "meta". The "meta" file seem to be the meta data of the file. In that case how to open the "common" file
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1335 |
16 Mar 2015 11:57 AM |
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6 Replies and 2528 Views
ROI problem 2528 6
Started by Deleted User
I was wondering whether anyone could help me with regards to a problem I'm having.
I wish to extract pixel values (all 8 bands) for known ROIs. I created ROIs from a vector (shapefile containing co-ordinates of known points).
Once all the ROIs are created - I was wondering whether it's possible to extract the pixel values for all bands via ASCII or .csv file
When I right click on the ROI - I don't get an option to Save (it's not highlighted) and if I click Save As then my only option is to sav...
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6 |
2528 |
16 Mar 2015 11:04 AM |
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4 Replies and 1454 Views
ROI Tool Question 1454 4
Started by Deleted User
I am trying to create a ROI file from bhtmref.img using ENVI 5.2. I clicked on the ROI tool, chose a Rectangular geometry with both Multi Part and Vertex Snap unchecked. I drew the rectangle and chose "Accept Rectangle". Then in the ROI Tool window, I chose File | Export | Export to Classic, and saved as bhtm_nd.roi.
I then ran the following neural network program on IDL 8.4, and got the solid colored ROI shape with no map features for testimg. I don't think that is what it should ...
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4 |
1454 |
16 Mar 2015 10:21 AM |
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2 Replies and 1746 Views
Mosaic Modis data 1746 2
Started by Deleted User
I get two ENVI format images by using Modis conversion toolkit and I'd like to mosaic the two images. I want to keep the original data in the non-overlapping area and obtain mean data in the overlapping area. I have done many tests, but all failed. anybody encounter this who can help me
I set the parameters as follows:
case 1: I use "Seamless Mosaic" in ENVI5.1. I set color matching action as: img1(reference)img2(none); feathering distance(0). In this case, the data in the area wher...
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1746 |
16 Mar 2015 06:03 AM |
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1 Replies and 1218 Views
Aster 1b data processing order 1218 1
Started by Deleted User
Hello
I've got a set of Aster 1b data and I would like to confirm the processing order please.
atmospheric correction - dark subtraction - layer stack- mosaic. I'm unsure when to do orthorectification do I do it before or after the layer stacking Or have I got everything around the wrong way. Thanks for your assistance
Alison
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1 |
1218 |
15 Mar 2015 09:30 PM |
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1 Replies and 1519 Views
abnormal pixel 1519 1
Started by Deleted User
how to remove abnormal pixel in hyperion data
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1 |
1519 |
14 Mar 2015 01:54 AM |