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1 Replies and 1409 Views Removing clouds  1409  1 Started by  Deleted User Hi all. I'm totally new to image analysis. I'm trying to do a supervised classification on a mosaic with clouds in some regions. I understand how to creat a mask to exclude those areas during the classification. But what happens to the areas where the pixels are removed How do you fill in the landcover type you think should be there Also, how do you deal with the cloud shadow Thanks so much for your help! Sara
1 1409
12 Aug 2008 07:09 PM
0 Replies and 1241 Views Programmatically opening a shapefile  1241  0 Started by  Deleted User Greetings, Is it possible to open a shapefile programmatically w/o using 'IDLffShape' The ENVI GUI menu offers File>Open Vector File, but I cant find an envi_open_vector_file routine. Is this because that GUI option uses IDLffShape I want to allow the user to select the shapefile from a gui interface in the same way Id use envi_pickfile or envi_open_data_file. Thanks, Matt
0 1241
12 Aug 2008 11:37 AM
1 Replies and 1253 Views L1T  1253  1 Started by  Deleted User How can I convert DAT file of Hyperion to L1T file.
1 1253
12 Aug 2008 01:43 AM
0 Replies and 897 Views simulation of radar images  897  0 Started by  Deleted User I don't know , Is it possible or not , But , i wanna to know is it possible to simulation radar images from one mode to another mode , for example from mode S2 to S7 . If it is possible , this task is possible with ENVI softwares
0 897
09 Aug 2008 04:34 AM
2 Replies and 1091 Views Label x-axis in x-profile and y-profile?  1091  2 Started by  Deleted User Hi folks, I've looked around and want to make sure that I am not missing anything. I have a hypercube where the three physical axes are wavelength and two angles. Does anyone know a method where, using ENVI, one can bring up an x-profile or y-profile and instead of sample (for x-profiles) or line (for y-profiles) one can label the x-axis with say, angle number This would be analogous to using wavelength instead of band number as the x-axis label for a z-profile. If not ENVI, is this ...
2 1091
07 Aug 2008 02:16 PM
0 Replies and 1165 Views Batch processing tutorial?  1165  0 Started by  Deleted User We don't have ENVI but EI in our country office. However, our colleagues in the field (Africa) have ENVI. I am sending this message on their behalves as they have very limitted internet access. They would like to know the way to batch process in ENVI. Is there a way to go arround IDL programming and rather use a GUI like in EI COuld you direct then to a turorial Thank you very much for your answer. Lauriane.
0 1165
07 Aug 2008 07:41 AM
1 Replies and 1398 Views Batch processing tutorial?  1398  1 Started by  Deleted User We don't have ENVI but EI in our country office. However, our colleagues in the field (Africa) have ENVI. I am sending this message on their behalves as they have very limitted internet access. They would like to know the way to batch process in ENVI. Is there a way to go arround IDL programming and rather use a GUI like in EI COuld you direct then to a turorial Thank you very much for your answer. Lauriane.
1 1398
07 Aug 2008 07:41 AM
1 Replies and 1416 Views Changing ENVI temporary directory  1416  1 Started by  Deleted User Hi, I am trying to run few instances of IDL runtime with ENVI function (GLT_DOIT) simultaneously. What i realise is that these instances all write to a single temp file envi.tmp0-bsq. This fails almost all runtime instances. Does ENVI check for presence of file before dumping data to the temp file Is there a way to get around this Can I change to different temp directories for different instance for example Thanks for any help.
1 1416
06 Aug 2008 10:55 PM
0 Replies and 1288 Views LST from NOAA AVHRR  1288  0 Started by  Deleted User I would appreciate it if anyone of you has already developed an algorithm for estimation of LST from NOAA AVHRR images. Moreover, did anyone of you know how to calibrate the MetOp-A data Thanks in advance, Adrianos
0 1288
05 Aug 2008 05:30 AM
1 Replies and 1010 Views FLAASH and smoke haze artifact  1010  1 Started by  Deleted User I have used FLAASH to atmospherically correct an Ikonos image. The image had forest fire smoke haze which I was content to leave in the image - as it was in the top right corner (out of the way). However I seem to have an artefact in the ex-FLAASH image that looks like smoke haze right across the middle of the output image. The artefact is a line with a sharp edge running width ways, halfway up the image and it 'feathers' out for a distance (perhaps1/20th of the image). Is leaving smoke in one p...
1 1010
03 Aug 2008 05:37 PM
2 Replies and 1226 Views Rule images for maximum likelihood classification  1226  2 Started by  Deleted User I`m triying to compare some supervised classifications and I need to use the rule images for the maximum likelihood classification. I cannot use these images because they have values ranging from -300.000 up to 100. I have tried to change the scale factor several times, but I cannot obtain any reasonable values... What I need is a probability image ranging from 0-1 or any other proportional variation. Can anyone help me, With the rule classifier I only obtain binary images (0 or 1 values), ...
2 1226
01 Aug 2008 12:12 PM
1 Replies and 1198 Views Reading MERIS data  1198  1 Started by  Deleted User The ENVI help file says that 'ENVI applies gains and offsets to the geophysical (non-reflectance) products, so you do not need to apply them'. When I open up an MERIS level 1 image (ESA N1 data) the the data are 16 bit numbers. In other words, I have to apply the scaling factors to get the geophysical floating point numbers. Does anyone know a way around this
1 1198
01 Aug 2008 11:12 AM
0 Replies and 970 Views Reading MERIS data  970  0 Started by  Deleted User The ENVI help file says that 'ENVI applies gains and offsets to the geophysical (non-reflectance) products, so you do not need to apply them'. When I open up an MERIS level 1 image (ESA N1 data) the the data are 16 bit numbers. In other words, I have to apply the scaling factors to get the geophysical floating point numbers. Does anyone know a way around this
0 970
01 Aug 2008 11:12 AM
0 Replies and 973 Views changing data type  973  0 Started by  Deleted User Hi, Is there any way to change my data from floating point to integer (16-bit) type I'm trying to do an ACORN atmospheric correction on MASTER data. Thank you, Betsy
0 973
31 Jul 2008 05:33 PM
1 Replies and 1367 Views changing data type  1367  1 Started by  Deleted User Hi, Is there any way to change my data from floating point to integer (16-bit) type I'm trying to do an ACORN atmospheric correction on MASTER data. Thank you, Betsy
1 1367
31 Jul 2008 05:33 PM
0 Replies and 1204 Views Convert contours to DEM  1204  0 Started by  Deleted User I'm now using ENVI version 4.4. I have used the function converting contour to DEM but it seemed to be unsuccessful. At the final step of choosing DEM output parameter i met the error message 'Attemp to call undefined procedure/function: 'ENVI_GRID_PARAM_EVENT'' . I have tried again in ENVI 4.1 and haven't met this error. Is it an error in ENVI 4.4 and how can i fix it
0 1204
30 Jul 2008 04:09 AM
2 Replies and 1097 Views Automatically loading file created with ENVI_OUTPUT_TO_EXTERNAL_FORMAT?  1097  2 Started by  Deleted User I'm trying to output the ROI of an image with the following code: ENVI_OUTPUT_TO_EXTERNAL_FORMAT, dims=dims, fid=fid, OUT_NAME=noexttypetime'.bin', /ENVI, pos=pos Now the code works, the file is created, all is well and good BUT the new file is automatically loaded into my 'Available Bands' list. Does anyone know how to prevent this from happening
2 1097
21 Jul 2008 02:57 PM
1 Replies and 1229 Views Using ENVI Menu Functions with new IDL .pro  1229  1 Started by  Deleted User In the simplest terms, I'm trying to create a program that I can add to ENVI's menu structure that will call the ROI Tool which exists at Basic Tools-> Region of Interest-> ROI Tool. When I go to the envi.men file, I can see that that menu option corresponds to the following code (in envi.men): {ROI Tool} {roi tool} {envi_menu_event} I have this basic, bare bones .pro that I want to accomplish the same thing as that menu selection: pro callROI, event xmanager, envi_menu_event, base, EV...
1 1229
15 Jul 2008 01:57 PM
1 Replies and 993 Views Edit header or convert map projection ?  993  1 Started by  Deleted User Hi all, I have a question about envi images and associated header files. In an IDL script, i used ENVI_setup head and output an image from the script. The results are all ok, but the projection coordinates of the output are slightly off from the input image. Its probably negligible because they line up perfectly and the difference is only in the numbers after the third decimal place ( for eg. Input (53283.234) vs output(53283.239 )). I usually end up importing the header file into the outpu...
1 993
15 Jul 2008 07:10 AM
2 Replies and 1187 Views Creating ROIs and using them in IDL  1187  2 Started by  Deleted User Hi all, I have a problem with the following code. I want to create an ROI by band threshold, convert the ROI into a class image, and then sieve the class image. I am able to do this perfectly using the ENVI GUI. However, I want to do this in an IDL script and am able to create the ROI, but am not able to proceed further. I think i'm messing up the ROI_IDS concept and that maybe the problem. But i'm not quite sure. I am basically following the same steps as i would when i use the GUI. Anot...
2 1187
14 Jul 2008 12:29 PM
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Page 109 of 137 << < 107108109110111 > >>