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3 Replies and 1815 Views
HYPERION vertical dark stripes 1815 3
Started by Deleted User
I have a HYPERION image and it has a lot of vertical dark stripes.How can I remove that stripes ENVI has a command "replace bad lines" but it does only work on the one-pixel width vertical columns.It doesn't work on more than one columns which are side by side.How can I solve this
Thanks a lot..
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3 |
1815 |
12 Apr 2011 12:47 AM |
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0 Replies and 1902 Views
Co-occurrence Entropy equation 1902 0
Started by Deleted User
Can anyone explain why the filter/co-occurrence on an 8-bit floating point panchromatic image can yield entropy values of > 1 I understood entropy as explained in: http://www.fp.ucalgary.ca/mhallbey/entropy.htm should not exceed 0.5, yet quick stats on ENVI's filter/co-occurrence entropy gives values that range from 0 to 2.19. Can anyone from ITT-VIS provide the actual entropy equation they are using, instead of just the reference to Haralick Thanks in advance!
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1902 |
10 Apr 2011 12:27 PM |
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6 Replies and 2025 Views
Using FLAASH with airborne hyperspectral sensors 2025 6
Started by Deleted User
Hi all,
I've recently had my Specim Eagle and Hawk datasets delivered for my study sites in the UK. I have performed geo-corrections using AZGCORR and now want to atmospherically correct the imagery if possible in FLAASH.
The airborne hyperspectral data is in the correct units of radiance (uW/(cm2*nm*sr)) in the BIL format. Both the Eagle (VIR) and Hawk (thermal) contains ~250 bands at 2nm intervals. Neither of the sensors is listed within the FLAAH settings.
I have made a number of attemp...
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6 |
2025 |
08 Apr 2011 08:32 AM |
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5 Replies and 2637 Views
HYPERION atmospheric correction 2637 5
Started by Deleted User
Hi,
I have a HYPERION image.I downloaded it a few days ago.I have a few questions to you
1) One of USGS employee told me that some of the image's bands are calibrated and some of are not.What did he/she mean by calibratedIs that mean that calibrated bands are atmospherically corrected
2) Do I have to correct that image atmospherically or is that already corrected
3) When I downloaded the image ,image came with some other files (.met, .aux, .fgdc, .hdr). Does one of these files...
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5 |
2637 |
08 Apr 2011 01:48 AM |
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0 Replies and 1477 Views
AFAR and ROC for a particular target detection 1477 0
Started by Deleted User
How can I find out the the hit rate and Average False Alarm Rate (AFAR) for a particular target detection Also how can I find out the ROC curve for the same
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0 |
1477 |
06 Apr 2011 10:44 PM |
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1 Replies and 1514 Views
error in DEM extraction 1514 1
Started by Deleted User
Sir, I am using the dem extraction wizard to create dem from aster stereo images...but in the step to create epipolar images it shows an error " array dimensions must be greater than zero"..Kindly suggest a solution to overcome this
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1 |
1514 |
06 Apr 2011 10:53 AM |
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0 Replies and 1621 Views
combining layers in envi using IDL 1621 0
Started by Deleted User
hello, is any know how to combine a group of layers that are actually land cover classes using a script in IDL. i'm new in this field. thx
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0 |
1621 |
06 Apr 2011 05:41 AM |
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6 Replies and 1554 Views
Calculation of carbon loss, carbon content and forest loss, 1554 6
Started by Deleted User
Hello everyone,
Given two images:
· Landsat TM 1998
· Landsate ETM 2001
How can we measure and calculate the following in ENVI:
1. Carbon loss due to forest clearance between 1989 and 2001 (conversion from mature forest to pasture and agricultural land)
2. Carbon content of the forest
3. Forest loss
Thank you
Regards
Jamal
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6 |
1554 |
05 Apr 2011 06:03 AM |
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0 Replies and 1748 Views
How might the local circumstance affect the choice of remote sensing system (RSS) and consequently t 1748 0
Started by Deleted User
How might the local circumstance affect the choice of remote sensing system (RSS) and consequently the criteria of the required image in case of earthqauke
The characteristics of stricken area (by earthquake):
1. large city
2. the city is in developing country,
3. has a relatively modern city centre,
4. has large areas of high density,
5. Has Informal suburban housing on its outskirts.
6. Has several outlying towns were also affected.
7. There was no rel...
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1748 |
05 Apr 2011 06:00 AM |
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0 Replies and 1551 Views
having one image using different layer. 1551 0
Started by Deleted User
hey, i have a serious prob wish is the combination of 6 layers that represent a classification results for each class. So the goal is to have one image that combine the overall classes for the Accuracy assessment procedure. the same process will be applied to other group of layer for label two (12 layers) and label 3 (18 layers). i tray to use arcgis for that procedure using the mosaic tool, and it doesn't work. Map algebra also doesn't give result (using merge and mosaic function). So please he...
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1551 |
05 Apr 2011 02:56 AM |
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1 Replies and 1625 Views
Getting Stat Values from EVF 1625 1
Started by Deleted User
An example of MODIS Image is posted above and overlaid EVF. My question is: how do I get individual statistical values of each polygon in the EVF The sample EVF has five polygons (boundaries) and I want to get the basic stats of eeach area by using a simple polygon. I presume I could it manually by clipping each area but what if I got fifty images Is there a way in which I could get basic stats of each area by using single EVF Thank you.
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1 |
1625 |
04 Apr 2011 01:43 AM |
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3 Replies and 1563 Views
Satellite Image to Thematic Map 1563 3
Started by Deleted User
I want to map out moisture availability using satellite image but I do not know how to convert the raster image to a thematic map with limiting boundaries like state boundaries.
I am using ArcGIS 9.3 and ENVI 4.3.
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3 |
1563 |
01 Apr 2011 03:46 AM |
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0 Replies and 1361 Views
Using SIR-C data 1361 0
Started by Deleted User
Dear Sirs:
I have some questions on using SIR-C image in ENVI Radar module . If you help me, I will appreciate you very much.
I have download availble Radar images from USGS. These are SLC-images of SIR-C (L- and C- wavelenght).
When I use Radar module and I try to veiw header file (*ldr_ceos) what "record info" should I choose for OFFSET:
"Filname: D:\REMOTE_SENSING\SIR-C\PR42920\pr42920_ldr_ceos
File Descriptor Record
Record Info &911 6...
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0 |
1361 |
31 Mar 2011 07:37 AM |
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0 Replies and 2266 Views
DEM generation from SRTM hgt files 2266 0
Started by Deleted User
Hi,
I am a new SARscaper with an ENVI 4.7 product on my 32-bit Linux system.
When I try to generate a DEM(Digital Elevation Model) from SRTM datas (*.hgt files), I am obtaining a DEM file and an anohter file named same with the DEM file in addition with a suffix ".hdr". I can successfully view my DEM file, but when I progress to the next step in order to generate interferogram with DEM, I am encountering an error message which includes the unavailability of the header fil...
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0 |
2266 |
30 Mar 2011 03:02 AM |
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1 Replies and 1830 Views
Problems Calibrating LANDSAT Imagery 1830 1
Started by Deleted User
I am attempting to calibrate some LANDSAT imagery in order to prepare it for atmospheric correction. However, when I select the input file and click 'OK', I get an error message saying: "Problem: Landsat calibration only works with up to six bands of data with the exception of NLAPS TM5." I have attempted to select a spectral subset of less than 6 bands before selecting 'OK', but I still get the error message. Does anyone know what the issue is
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1 |
1830 |
27 Mar 2011 06:40 AM |
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4 Replies and 1832 Views
Remove clouds 1832 4
Started by Deleted User
Dear all,
I have some landsat7 image, which have clouds. It is really difficult for me to classify with these data. i want to remove these clouds by replacing with other free images at the same study area. But I dont know how to do it.
Any reply would be appreciate. Thanks for the advance.
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4 |
1832 |
25 Mar 2011 03:48 AM |
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8 Replies and 1777 Views
help in Etm data process 1777 8
Started by Deleted User
I got some ETM data from www.
I write some IDL programs to process the ETM data. the data structure of ETM data is
L7*******_B10.TIF
L7*******_B20.TIF
L7*******_B80.TIF, with a MTL.txt file.
I use ENVI to open MTL.txt file, it shows me 3 different files, the first one is with 1 band(pan),
the second is the thermal infrared band with 2 bands, the last is composed with 6 bands.
I use ENVI_OPEN_FILE to open MTL.txt file, the r_fid returned a array of fid. 3 elements
...
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8 |
1777 |
21 Mar 2011 07:55 AM |
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0 Replies and 1342 Views
help in Etm data process 1342 0
Started by Deleted User
I got some ETM data from www.
I write some IDL programs to process the ETM data. the data structure of ETM data is
L7*******_B10.TIF
L7*******_B20.TIF
L7*******_B80.TIF, with a MTL.txt file.
I use ENVI to open MTL.txt file, it shows me 3 different files, the first one is with 1 band(pan),
the second is the thermal infrared band with 2 bands, the last is composed with 6 bands.
I use ENVI_OPEN_FILE to open MTL.txt file, the r_fid returned a array of fid. 3 elements
...
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0 |
1342 |
21 Mar 2011 07:55 AM |
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2 Replies and 1521 Views
Apply identical classification to multiple images? 1521 2
Started by Deleted User
I'd like to apply a classifier developed on one image, image1, to a different image, image2, without training the classifier on image2. That is, apply the classifier (be it MLC, NN, SVM, etc) to image2 as if it were image1. For example, if I believed that there were no spectral differences between the two images, then I should not have to collect training sites and retrain the classifier on image2, I should just be able to directly apply the classifier trained on image1 and expect the same class...
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2 |
1521 |
20 Mar 2011 07:59 AM |
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2 Replies and 1659 Views
Problems with calibrating a SPOT file 1659 2
Started by Deleted User
I'm using the spot_calibrate.sav tool and can't get it to work.
I import my DIMAP through open external file>SPOT>DIMAP using the .DIM.
But when I try to use the tool I get an ENVI warning "File is not a valid SPOT DICOM sensor type".
In my header the sensor type does not seem to be included and is stated as unknown by default. When I change the sensor type to "SPOT" through ENVI and try the tool again I get the prompt for the .DIM file but then ENVI free...
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2 |
1659 |
18 Mar 2011 11:28 AM |