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1 Replies and 1200 Views ENVI spectral plots  1200  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
1 1200
19 Jul 2007 06:15 PM
2 Replies and 1116 Views Mosaic__doit: Error: 'An attempt to subscrip UST with K is out of range'  1116  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 ...
2 1116
19 Jul 2007 07:08 AM
1 Replies and 1288 Views adding lat/lon to a file  1288  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
1 1288
18 Jul 2007 03:26 PM
1 Replies and 1266 Views convert floating point data to 8bit grayscale  1266  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
1 1266
18 Jul 2007 09:17 AM
2 Replies and 1165 Views Combine Classifications  1165  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...
2 1165
06 Jul 2007 07:02 AM
1 Replies and 1366 Views resize poligonal area?  1366  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
1 1366
25 Jun 2007 11:46 AM
2 Replies and 1299 Views mosaic_doit doesn't resample?  1299  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....
2 1299
22 Jun 2007 12:52 PM
1 Replies and 1405 Views ASTER L1B orthorectification and misalignment of swir and vnir  1405  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...
1 1405
15 Jun 2007 07:30 AM
0 Replies and 1377 Views Sigma nought: Similar Problem as post ID -> 2236: Importing Radar: Anneley Mcmillan  1377  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...
0 1377
06 Jun 2007 09:04 AM
1 Replies and 1467 Views MOSAIC_DOIT and feathering  1467  1 Started by  Deleted User How can i use feathering with MOSAIC_DOIT function
1 1467
04 Jun 2007 11:33 AM
0 Replies and 1334 Views mosaicking  1334  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
0 1334
01 Jun 2007 12:59 PM
0 Replies and 1381 Views License  1381  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
0 1381
01 Jun 2007 03:20 AM
0 Replies and 1366 Views Batch downsampling problems (RESIZE_DOIT) under solaris; bug?  1366  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...
0 1366
25 May 2007 01:39 AM
1 Replies and 1923 Views to open netcdf file to change its map projection  1923  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...
1 1923
22 May 2007 11:17 AM
1 Replies and 1336 Views statistical methods of feature selection  1336  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!
1 1336
21 May 2007 05:02 PM
2 Replies and 1235 Views Unveiling the Lithology of Vegetated Terrains  1235  2 Started by  Deleted User as I can eliminate the vegetation of an image landsat or aster Christian Vargas
2 1235
20 May 2007 10:48 PM
0 Replies and 1443 Views IKONOS atmospheric correction  1443  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...
0 1443
17 May 2007 03:02 AM
0 Replies and 1374 Views Programmatically Plotting X,Y Data from Excel  1374  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.
0 1374
15 May 2007 01:16 PM
1 Replies and 1223 Views Orthorectify ASTER L1B  1223  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
1 1223
14 May 2007 07:15 AM
3 Replies and 1237 Views LiDAR: ASCII to LAS (Re-posting)  1237  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...
3 1237
13 May 2007 09:18 PM
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