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0 Replies and 1291 Views batch Output ROIs to ASCII  1291  0 Started by  Deleted User Are there any batch or doit routines that mimic the 'Output ROIs to ASCII' command that is on the ROI tool I can get the ROI data values with ENVI_GET_ROI_DATA but I also need the map coordinates that correspond to each ROI value. Thanks, Kyle Cavanaugh
0 1291
27 Mar 2008 07:52 AM
1 Replies and 1172 Views what _doit routine should use to convert image's data(0-255) to 0-1 data?  1172  1 Started by  Deleted User I am using hdf files now, I want to convert the data of the files to 0 and 1 data, the aim is to realize: if (0
1 1172
27 Mar 2008 07:22 AM
1 Replies and 1499 Views Spectral Library from MASTER Spectral Response Files (SRF)  1499  1 Started by  Deleted User Hi, I am trying to build spectral library to be used in atmospheric correction software (FLAASH). What I am doing is: 1- Copying the wavelengths and spectral response values for each band (VNIR - SWIR) from the MASTER website and saving in seperate folders ( 25 folders total). 2- After this I click spectral -> spectral library -> spectral library builder -> ... Import. I select ASCII file. 3- In this way, I import all the files into spectral libray dialog and the change their name t...
1 1499
24 Mar 2008 11:44 AM
0 Replies and 1354 Views neg values for pan-sharpened image  1354  0 Started by  Deleted User Hi, I have an image, corrected to QuickBird radiance values, that I pan-sharpened. Minimum values in bands 3 and 4, which were close to zero in the multi-spectral image, came up negative in the PC pan-sharpened image. Following up with band ratios produced truly wacky numbers. Has anybody run into this before Is there a way to constrain the lower values to just over 0 Also, I'm trying to figure out how to get the ratio of incoming and outgoing radiance for QuickBird imagery, not just...
0 1354
21 Mar 2008 09:29 AM
0 Replies and 1221 Views Endmember Collection  1221  0 Started by  Deleted User Somebody could explain me how to use this method or which is the use of this method. Thanks
0 1221
20 Mar 2008 01:59 PM
1 Replies and 1355 Views Masks and Compute Difference  1355  1 Started by  Deleted User Hi. I'm running the Compute Difference method on an island scene. All I really want to do is derive two change classes from one scene in 1988 to another in 2007: vegetation to vegetation (little or no change beyond seasonal, which are minimal as the location is tropical) and vegetation to developed. I've already georeferenced them and performed a dark object subtraction to minimize atmospheric effects. I would like to be able to eliminate the surrounding ocean water from the analysis but d...
1 1355
17 Mar 2008 07:44 PM
0 Replies and 1458 Views Simple Post-Classification Analysis  1458  0 Started by  Deleted User Hello. I produced two separate Maximum Likelihood classifications of the same scene 13 years apart (using the same classes). How can I produce a change detection map (and data) between them based on pixel-level classification differences Thanks, Mike
0 1458
17 Mar 2008 06:56 PM
1 Replies and 1902 Views Apply Gain and Offset dialog...  1902  1 Started by  Deleted User Hello. In the Gain and Offset Values dialog box, it lists the bands of the image I've chosen sequentially titled 'Band 1, Band 2, Band 3.....'. However, it appears to me that these are not actually identified with the Landsat Bands 1,2,3... of the LS image I've chosen, but instead seem to refer to the bands as they are listed in the Available Bands window. In other words, it seems to me that the lists of band names in the Gain and Offset Values would be the same regardless of whether the band...
1 1902
17 Mar 2008 03:29 PM
1 Replies and 1223 Views Have a FLAASH error message. What does this error message mean and how can I solve it?  1223  1 Started by  Deleted User Hi ENVI users I am using FLAASH in ENVI 4.3 to correct for atmospheric interference in Hyperion data that is L1Gst product. However the module does not run to completion due to the following error message: Problem: The FLAASH progam exited with the following errors: ACC error: avrd:No nonblank pixels foundIDL error CDRIVER 4V 3R2: >>>Wait for MODTRAN4 calculation to finish….. ACC_AVRD ACC_HYPER2 ACC_ACC ENVI_ACC_EVENT ENVI_FLAASH_PROCESS_MANAGER $MAIN$ Please, if anyone ca...
1 1223
17 Mar 2008 12:25 PM
1 Replies and 2019 Views envi: MODIS hdf projection  2019  1 Started by  Deleted User Hi envi users, I have MODIS NDVI files which are in its native sinusoidal projection and in .hdf format. It seems like ENVI cannot read the projection information of these modis hdf files. It displays them but does not read its projection parameters. I have been using erdas to convert the HDF files into IMG and then bring them into ENVI. Although this works, i want to find out if there is a way to get ENVI to read the modis hdf files projections. I know i can edit the header for each file, ...
1 2019
14 Mar 2008 02:00 PM
0 Replies and 1099 Views 'envi_stats_doit' / mask  1099  0 Started by  Deleted User I am trying to use 'envi_stats_doit' to calculate statistics of some ROIs. However, I would like to compute the statistics for the pixels not included in a mask image. I am trying to use the mask with envi_stats_doit function (with m_fid and m_pos) to get it. I use the following command: roi_dims=&91envi_get_roi_dims_ptr(roi_ids&91j&93),0,0,0,0&93 envi_doit, 'envi_stats_doit', fid=fid, pos=pos, $ dims=roi_dims, comp_flag=4, mean=c_mean, $ stdv=c_stdv, cov=c_cov,m_fid=mfid,m_pos=mpos ...
0 1099
14 Mar 2008 03:15 AM
0 Replies and 1285 Views ENVI Classification Tools  1285  0 Started by  Deleted User I have been trying to figure out if there is any way to find the centroids after a K-Means classification Does anyone know if this is possible
0 1285
12 Mar 2008 07:00 PM
1 Replies and 995 Views Import MODIS Vegitation Continuous Field (VCF)  995  1 Started by  Deleted User I have a problem with opening VCF images on ENVI 4.1. The problem is my MODIS images are in GeoTIFF format instead of HDF. When i open the file, the software cannot recognize the images. How can i change the MODIS images in GeoTIFF format downloaded from GLCF webpage to HDF format or how can i open these VCF images in ENVI Can someone help me Thanks in advance.
1 995
11 Mar 2008 08:20 AM
1 Replies and 1199 Views On the atmosphere correction to TM image by using ENVI flaash tech  1199  1 Started by  Deleted User I am a beginner , now i am using flaash to correct a TM image . i am sure that all process is according to the ' FLAASH Module User's Guide'. But the result always appear such as reflectance data distortion , for example most of data are not in the normally range. So please, someone can give me a advice, may as well detail.
1 1199
10 Mar 2008 07:42 AM
3 Replies and 1277 Views MODIS HDF5  1277  3 Started by  Deleted User Hello everybody, I've downloaded some MODIS files on HDF v5 format, but ENVI can't open them! I receive a massage like: this version is not supported. Has anybody had this problem Appreciated in advance MBN
3 1277
04 Mar 2008 08:48 AM
1 Replies and 1144 Views Exporting DEM  1144  1 Started by  Deleted User I don't know how to export a DEM image with data type of integer to ENVI standard image with the same data type. I have export DEM image to ENVI standard image but the data type was changed to byte instead of integer. Can someone help me with this Thanks in advance.
1 1144
03 Mar 2008 03:23 PM
0 Replies and 1425 Views IDL executable with ENVI code  1425  0 Started by  Deleted User Dear Users, I have a simple code that I want to make as an executable. In theory this should be trivial, but I am getting errors which I don't know how to fix. I'm running IDL v6.3 and ENVI 4.3 on linux. Here the following code for which I want to create the executable: PRO commandLine appWorkingDir = (command_line_args( ))&910&93 compile_opt STRICTARR envi, /restore_base_save_files envi_batch_init, /NO_STATUS_WINDOW PRINT, 'This is a test of the commandLine.pro ...' PRINT,...
0 1425
01 Mar 2008 10:10 AM
1 Replies and 1539 Views 3D Surface View, vectors won't print  1539  1 Started by  Deleted User Hello, I'm trying to print a 3D Surface View with a series of vectors overlain on a NAIP aerial photo. The vectors that are either dashed or dotted work fine. However, the solid vectors will not PRINT at all. They show up perfectly on my monitor and I can 'save the surface as' an image file and all the vectors are visible, however, I can't save the surface at a high enough resolution to then print that image instead of printing directly from the 3D Surface view (it appears that the resolutio...
1 1539
27 Feb 2008 09:06 AM
1 Replies and 1022 Views ikonos calibration  1022  1 Started by  Deleted User I need to calibrate an ikonos image. How can i do
1 1022
27 Feb 2008 08:48 AM
0 Replies and 1385 Views creating layerstack in idl for images  1385  0 Started by  Deleted User Hi, I created a layerstack of two images in IDL using the following code. Let's say IMAGE A and IMAGE B have been chosen. both are of samples 2179 and lines 761. CODE: layerstack=fltarr(2179,761,2) layerstack(2178,760,0)=A layerstack&912178,760,1&93=B envi_write_envi_file,layerstack,out_name='D:/filename.img' I get the result subscript out of range subscript encountered: layerstack. All i'm trying to do is to say the A is the first band of the layerstack and B is the second...
0 1385
26 Feb 2008 08:34 PM
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Page 113 of 137 << < 111112113114115 > >>