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1 Replies and 1213 Views
ENVI spectral plots 1213 1
Started by Deleted User
Hello,
I am an ENVI user. I intend to create 2-D spectral plots of two full scenes, one versus the other. The software is not giving the option of the ' Full scene' tab for the scatter plots.
Do any of you know what the problem might be
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1213 |
19 Jul 2007 06:15 PM |
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2 Replies and 1134 Views
Mosaic__doit: Error: 'An attempt to subscrip UST with K is out of range' 1134 2
Started by Deleted User
Hi,
I have just started using ENVI and upon trying to mosaic two images I get the error mentioned in the subject. Any idea which part of the mosaic_doit command could cause this
The relavent code is:
ENVI_FILE_QUERY, r_fid_AL_BH_N, ns=nafr_ns, nl=nafr_nl
ENVI_FILE_QUERY, r_fid_AL_BH_S, ns=safr_ns, nl=safr_nl
mosfids=&91r_fid_AL_BH_N,r_fid_AL_BH_S&93
dims = &91&91-1,0,nafr_ns-1,0,nafr_nl-1&93,&91-1,0,safr_ns-1,0,safr_nl-1&93&93
pos=&91&910&93,&910&93&93
...
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2 |
1134 |
19 Jul 2007 07:08 AM |
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1 Replies and 1312 Views
adding lat/lon to a file 1312 1
Started by Deleted User
Hello,
I have 2 files in envi format. In file 1, I have hyperspectral data and in file 2 i have two bands: the lat and the lon for each of the pixels of file 1.
How can i combine both files so that i get one file with the hyperspectral image and the geolocation information attached to it
Thanks,
Raul
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1 |
1312 |
18 Jul 2007 03:26 PM |
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1 Replies and 1280 Views
convert floating point data to 8bit grayscale 1280 1
Started by Deleted User
Dear Forum,
I would like to convert some floating point data to 8bit grayscale imagery. Is it suitable to use the
fix(b1)
option in band math or should I use the
interactive stretching
in enhancements
Kind regards,
Wesley
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1 |
1280 |
18 Jul 2007 09:17 AM |
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2 Replies and 1185 Views
Combine Classifications 1185 2
Started by Deleted User
Hi everyone,
I am doing a post-classification change detection on a barrier island, ultimately preforming a hurricane Dennis impact analysis. For date1, I have several single band ISODATA classification files. In each file, some of the clusters are labeled, and others were intentionally left unidentified. I then would mask out known pixels and re-run the ISODATA classification on unknown pixels. This 'cluster bust' approach to classification has produced multiple classification files.
Thi...
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2 |
1185 |
06 Jul 2007 07:02 AM |
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1 Replies and 1380 Views
resize poligonal area? 1380 1
Started by Deleted User
Good afternoon.
I´m a new user of ENVI.
My study area is in the coast and for a posterior classification a need to cut only the continent.
How I make this
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1 |
1380 |
25 Jun 2007 11:46 AM |
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2 Replies and 1313 Views
mosaic_doit doesn't resample? 1313 2
Started by Deleted User
From the ENVI help (mosaic_doit chapter), i quote the following statement:
'You can mosaic and automatically resample individual bands, entire files, and multi-resolution georeferenced images. '
How do I turn on the resampling when using a multi-resolution dataset (OMEGA) When I change the pixel_size argument to my preferred pizel size, the function will merely patch together the images in their original resolutions and relabel the pixel size in the projection info to the specified value....
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2 |
1313 |
22 Jun 2007 12:52 PM |
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1 Replies and 1427 Views
ASTER L1B orthorectification and misalignment of swir and vnir 1427 1
Started by Deleted User
Hello list,
lately I have been trying to orthorectify an ASTER scene for several hours. I have corrected the vnir band to a Landsat 7 panchro and used an ASTER DEM as elev source. Then I tried to link the viewer with the VNIR GCPs to a viewer with the SWIR bands and transfered the exact location of the GCPs to the SWIR image while using the geolocation info acquired during the VNIR orthorectification. Nonetheless when I layerstack the two resulting ortho files they are shifted. Any ideas why th...
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1 |
1427 |
15 Jun 2007 07:30 AM |
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0 Replies and 1401 Views
Sigma nought: Similar Problem as post ID -> 2236: Importing Radar: Anneley Mcmillan 1401 0
Started by Deleted User
Hi All,
So I have got a problem similar to Anneley.
I have a Radarsat image collected in SAR FINE 4F, PATH IMAGE nominal resolution 6.25m.
I used the method suggested in the Link ID 2236 to georeference the beta nought image. I would now like to convert the beta nought to sigma nought. As I understand it you need the beta nought to perform the conversion, see this link
www.space.gc.ca/asc/pdf/tn5001r4.pdf
e.g. beta nought -> conversion to -> sigma nought
Once again though I run int...
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0 |
1401 |
06 Jun 2007 09:04 AM |
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1 Replies and 1482 Views
MOSAIC_DOIT and feathering 1482 1
Started by Deleted User
How can i use feathering with MOSAIC_DOIT function
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1 |
1482 |
04 Jun 2007 11:33 AM |
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0 Replies and 1358 Views
mosaicking 1358 0
Started by Deleted User
Bonjour,
j'ai des cartes topo et je voudrais er le mosaiquage de ces cartes.
Je voudrai avoir les etapes que je dois suivre sur envi
Merci
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0 |
1358 |
01 Jun 2007 12:59 PM |
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0 Replies and 1397 Views
License 1397 0
Started by Deleted User
J'ai télécharger ENVI 4.3 et je voudari avoi la license car la version que j'ai est en demo
merci
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0 |
1397 |
01 Jun 2007 03:20 AM |
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0 Replies and 1380 Views
Batch downsampling problems (RESIZE_DOIT) under solaris; bug? 1380 0
Started by Deleted User
Hello,
The resize-doit function seems to yield strange results when downsampling hyperspectral (OMEGA) datasets under solaris under version 4.3 of ENVI. The resulting cube has all even lines distorted. The relative spectral signature is still fine, but the even lines show a periodic distortion, with reflectance values ranging from ~900 to 1800, whereas they should be in the 0-1 range. The odd lines seem unaffected. This all does NOT happen if I manually resample the data using the ENVI-widget...
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0 |
1380 |
25 May 2007 01:39 AM |
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1 Replies and 1939 Views
to open netcdf file to change its map projection 1939 1
Started by Deleted User
Hi, i have been using IDL6.2 and ENVI4.2 and i am trying to open a netcdf file which is basically a lambert map projection with Hg air concentration values. i am trying to open the netcdf file so that i can change the cental meridian to match my domain and then extract ROI, but so far i am not been able to do so, each time i open up the file i have to input the header and it gives me an error, can someone tell me if this version is able to view netcdf file.
i can see that the new version has pr...
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1 |
1939 |
22 May 2007 11:17 AM |
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1 Replies and 1369 Views
statistical methods of feature selection 1369 1
Started by Deleted User
I want to use something like the divergence or Jeffreys-Matisota distance equation to determine the optimum subset of bands to use when classifying my image (I have several texture layers and topographic layers in addition to the spectral layers so it would be nice to reduce the dataset if possible).
Do I have to write a code for this in IDL or is there anything built in Any tips
Thanks!
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1 |
1369 |
21 May 2007 05:02 PM |
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2 |
1258 |
20 May 2007 10:48 PM |
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0 Replies and 1465 Views
IKONOS atmospheric correction 1465 0
Started by Deleted User
Hi All,
We recently purchased some IKONOS data for our study area. We got the geo-ortho kit with RPC's 15CE 90 (11bit)
Having orthorectified the imagery using a 15m DEM I am now attempting to atmospherically correct the data using FLAASH. Following the ortho I converted the 11bit data to at aperture-radiance using the calibration coefficients supplied by space imaging
http://www.geoeye.com/products/imagery/ikonos/spectral.htm
According to the spaceimaging website the data are then in...
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0 |
1465 |
17 May 2007 03:02 AM |
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0 Replies and 1391 Views
Programmatically Plotting X,Y Data from Excel 1391 0
Started by Deleted User
I was wondering if there is a way to directly plot x,y data from an excel spreadsheet onto AVHRR imagery in ENVI. If it is possible to use a script in IDL, that would be preferable.
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0 |
1391 |
15 May 2007 01:16 PM |
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1 Replies and 1238 Views
Orthorectify ASTER L1B 1238 1
Started by Deleted User
I am trying to orthorectify a subset of an L1B ASTER scene using GCPs. I have the RPC info saved in the header file. I am using an orthophoto (1 m NAIP) as the source of the GCPs. Everything seems to process ok, but the resulting image is blank (all 0s). Any suggestions
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1238 |
14 May 2007 07:15 AM |
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3 Replies and 1263 Views
LiDAR: ASCII to LAS (Re-posting) 1263 3
Started by Deleted User
I'm not sure what happened to my other thread, it appears to have been somewhat mangled on page 2! I'll repeat what I posted there.
I'm new to LiDAR and am trying to view our strips in ENVI. The data is currently in .all ASCII format with 9 fields, of which fields 2-5 are x, y, z and i from the last pulse and fields 6-9 are the corresponding values for the first pulse. When trying to use the 'ASCII to LAS' function I downloaded as part of the LiDAR Tools from the code library, using the 'I...
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3 |
1263 |
13 May 2007 09:18 PM |