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2 Replies and 994 Views
No nonblanck pixels found 994 2
Started by Deleted User
Hi
I am trying
to use the FLAASH module on Worldview-2 and it shows the following error “ACC
error: avrd: No nonblanck pixels found”. The tile size in the FLAASH advanced
parameters is 100 and when is increased to 200 its exit in same way.
What can I
do
Thank you
oli
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2 |
994 |
02 Jul 2012 02:15 PM |
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1 Replies and 982 Views
Basic change detection problem 982 1
Started by Deleted User
Hi,
I'm doing change detection from two unsupervised classification images. I can see the differences in their class statistics but when I use the change detection tool it shows me NO change in the classes.
Any idea why
Thanks
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1 |
982 |
29 Jun 2012 08:12 AM |
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1 Replies and 1094 Views
Flaash 1094 1
Started by Deleted User
I am trying to do an atmospheric correction of WV-2 images with FLAASH.
1.-I convert the WV-2
data from DN to radiance using Worldview radiance tool in Envi 4.8. I specify the output to floating point.
2.- I convert to BIL
format
Resulting radiance image
statistics
Basic Stats Min Max
Mean Stdev
Band 1
0.000000 40.228760 3.139071
3.520640
Band 2
0.000000 47.530544 3.079424
3.595684
Band 3
0.000000 31.5597...
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1 |
1094 |
28 Jun 2012 11:21 AM |
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1 Replies and 968 Views
SARScape - Fake_GCP xml file 968 1
Started by Deleted User
I am running "Interferogram to Phase Unwrapping" in the "Interferometry" menu followed by "refinement and reflattening." The Refinement and reflattening steps requires a "Orbital GCP file" input. Sometimes the "Interferogram to Phase unwrapping" produces a file that ends with "fake_gcp.xml" and seems to be suitable for the Refinement "Orbital GCP" file. However, sometimes this file is not produced. Any idea how to make this...
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1 |
968 |
27 Jun 2012 12:01 PM |
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1 Replies and 1282 Views
SARscape DEM creation using Sample Selection 1282 1
Started by Deleted User
I have successfully created a DEM using a pair of COMO SKYMed image and SARScape. I used the "Interferogram to Phase Unwrapping" in the "Interferometry" menu (followed by "refinement and reflattening" and "Phase to height conversion"). I have done this for full image scenes. However, I would like to attempt a higher resolution for a small area (the higher resolution requires too much memory for the entire scene). To create the subset, I used the SARScap...
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1 |
1282 |
27 Jun 2012 11:54 AM |
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4 Replies and 1225 Views
ERS 2 processing 1225 4
Started by Deleted User
Hi everyone.
I am trying to import two ERS-2 (AMI/SAR/IMAGE MODE) images in ENVI. The images seem to open but there is problem with their georeference and their coregister.Any helpful in bullets on how to proceed to the first processing steps of such kind of images woud be really appreciated.
Dimitris
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4 |
1225 |
27 Jun 2012 02:32 AM |
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2 Replies and 2508 Views
Zenith and Azimuth, worldview-2 2508 2
Started by Deleted User
Hi
I need help to calculate Zenith and Azimuth Angles in FLAASH for Worldview2. In my metadata file I have this information:
meanSunAz = 153.5;
meanSunEl = 44.6;
meanSatAz = 110.3;
meanSatEl = 78.3;
meanInTrackViewAngle
= -1.9;
meanCrossTrackViewAngle
= 10.2;
meanOffNadirViewAngle
= 10.3;
Which values should I
use in the Flaash module and how can I calculate them
Any help would be
greatly appreciated.
oli
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2 |
2508 |
22 Jun 2012 03:21 PM |
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2 Replies and 1041 Views
Creating a mask to mask out clouds(values of 1)? 1041 2
Started by Deleted User
hi, I am using ENVI 4.8 and i'm trying to do something here...
I have a Surface reflectance(SR) image which has clouds in it
I have one hdf file with 3 bands in it which are clouds data...
I have a mosaic of the SR and 3 cloud bands.... cloud values of 1 and non cloud values of 0.
I need to create an ROI where surface reflectance clouds are NOT present (i.e., equal to 1) and using THAT as a mask to mask that out of the SR Image.
Is there an easy way of going about this I been reading...
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2 |
1041 |
22 Jun 2012 03:18 PM |
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6 Replies and 1364 Views
How do I run Unsupervised Classification using LiDAR data? 1364 6
Started by Deleted User
Myself along with a few peers are new to ENVI and we've only been using it for a few days. We need to process LiDAR data. We've already obtained the BCAL LiDAR plugin for our usage. Our goal is to get the Unsupervised Classification methods working on our .LAS LiDAR files. We've had no such luck so far and have went through converting it to ASCII (binary) data, and .SHP shape-files as well. We would like to know how we can process the data we have, using the Unsupervised Classification methods p...
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6 |
1364 |
22 Jun 2012 02:46 PM |
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2 Replies and 1756 Views
KT aerosol_Worldview2 1756 2
Started by Deleted User
Hi
I am trying
to use the FLAASH module on Worldview-2 and it shows the following error “if
using KT aerosol retrieval then KT upper and KT lower channels must be defined”.
Recommended
wavelength for channel definition are: KT upper (2100-2250 nm) and KT lower
(640-680). Worldview-2 hasn´t wavelength for KT upper definition. What can I
do
Any help
would be greatly appreciated.
Thank you
oli
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2 |
1756 |
21 Jun 2012 03:52 PM |
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1 Replies and 1741 Views
Measure Area - ENVI 5.0 1741 1
Started by Deleted User
Hi all,
Does anyone know how to get the area of a polygon in ENVI 5.0 This used to be very easy in ENVI Classic. The "mensuration" tool only seems to want to give me line lengths for a polyline but not areas for a polygon.
Thanks, Guy
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1 |
1741 |
21 Jun 2012 02:37 PM |
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2 Replies and 1466 Views
How do I assign bands for batch processing in ENVI band math? 1466 2
Started by Deleted User
I am trying to perform batch processing in ENVI using band math. The input is a 7-band file of MODIS reflectance data which have been converted from hdf to bsq. The data type is integer.
I want to compute a normalized difference ratio using MODIS bands 2 and 6. I know that, in order to get bands 2 and 6, the POS syntax should refer to &911,5&93. I've modified some code from another program (which works fine).
The problem is that the values I get are negative and incorrect when computed usi...
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2 |
1466 |
20 Jun 2012 12:34 PM |
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7 Replies and 4360 Views
Pixel Locator in ENVI 5.0 4360 7
Started by Deleted User
Is the old "Pixel Locator" tool/functionality in ENVI 5.0 Basically, I need to send someone to a particular pixel to qeury the digital number.
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7 |
4360 |
20 Jun 2012 11:25 AM |
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6 Replies and 1303 Views
Co-occurrence Textures - Spatially Invariant? 1303 6
Started by Deleted User
Quick question: if I want to create texture features that are spatially invariant with a 1 pixel offset, what do I need to set the X & Y co-occurrence offsets to Is the x =1, y =1 default setting for spatially invariant features Thanks!
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6 |
1303 |
20 Jun 2012 03:28 AM |
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3 Replies and 1414 Views
ENVI 5 Image Registration Workflow 1414 3
Started by Deleted User
Hello,
Maybe I'm missing something here, but when I try to collect seed points within the Image Registration Workflow, but I cannot use the zoom tools to select the second point on the non-georeferenced image. I want to zoom in to the point I want to select but then it doesn't let me get back to create that point.
Wouldn't it be easier to just have the images side-by-side to select points, like in ENVI 'classic'
My initial excitement about the new ENVI interface is slowly fading, as I'm more...
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3 |
1414 |
19 Jun 2012 12:37 PM |
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2 Replies and 1225 Views
DEM extraction error 1225 2
Started by Deleted User
Hi, I am having a few issues with the DEM extraction wizard. The wizard goes through the full process on building epipolar images, generating parallax etc but fails right at the end of the process quoting the error...
'Point_LUN: Negative position argument not allowed. Position -8589911624, Unit: 100'
i have checked the location of the output filename and all is present and correct with sufficient disk space and am now fresh out of ideas!
Any help would be greatly appreciated.
i am using E...
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2 |
1225 |
19 Jun 2012 03:31 AM |
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0 Replies and 1102 Views
Raster Segments to Vector Data 1102 0
Started by Deleted User
Hello
I am writing to mention a problem I have encountered when trying to vectorize a binary image of segments (georeferenced). The problem occurring is that ENVI is vectorizing both the internal size of the binary image and the external one. In this way the 1 pixel edge image is converted 2 vector polygon. Is there a way to specify to ENVI (or IDL) to only vectorize the outer boundary of the binary image
Thank you in advance
Dimitris
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0 |
1102 |
18 Jun 2012 05:20 AM |
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1 Replies and 947 Views
QuickBird atmospheric corrections 947 1
Started by Deleted User
Hello,
I have QuickBird data which I would like to pre-process, mainly atmospheric corrections. I've read and re-read the QuickBird technical note on this but can't make sense of which band math equation to apply.
Has anyone done this before who could offer some initial tips
Charlotte
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1 |
947 |
17 Jun 2012 02:49 PM |
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0 Replies and 1277 Views
MOD04 AND ENVI 4.7 1277 0
Started by Deleted User
can someone teach me on how to process MOD04 (MODIS DATA) using envi sotware.
What processing options need to select in extracting AOT.
PLEASE HELP ME.
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0 |
1277 |
13 Jun 2012 11:11 PM |
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2 Replies and 1153 Views
Collect spectra in ENVI5 1153 2
Started by Deleted User
Does anyone know how to collect spectra in the spectral profile window in ENVI5 They've moved all the buttons.
Thanks
Victoria
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2 |
1153 |
13 Jun 2012 02:17 PM |