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1 Replies and 1592 Views high errors and georeferencing  1592  1 Started by  Deleted User I'm trying to georeference some 50 images and sometimes how much ever I try, Iget a high error about 10meters &more on the georeferenced image when I cross check in arc map. I could not find any camera callibration information for that set hence I have to georeference. Some times even when I pick a point I know for sure is the same one, my RMS value goes up and after playing with the points for a long while(a day or 2 sometimes) I finally try to warp the images and save them as tifs. I use RST...
1 1592
30 May 2008 12:22 PM
1 Replies and 1037 Views failed to get dims.....  1037  1 Started by  Deleted User I create a polygon ROI from the shapefile vertices and want to do 'raster to vector' with spatial subseting by 'envi_get_roi_dims_ptr' routine.I have get the DIMS,but it is failed to do 'rtv_doit' ,why program as follows: envi_open_file,'i:\test.tif',r_fid=ofid envi_file_query, ofid, ns=ns, nl=nl,dims=dims myshape=OBJ_NEW('IDLffShape', 'I:\basin\basin.shp') myshape->GetProperty, N_ENTITIES=num_ent FOR i=0,0 DO BEGIN ent = myshape->GetEntity(i) xmap=(*ent.vertices)...
1 1037
26 May 2008 03:34 PM
1 Replies and 1430 Views Envi file with Datum WGS 84 read as Clarke 1866 in Imagine Erdas  1430  1 Started by  Deleted User Actually i am useing 'ERDAS Imagine' and 'ENVI' for image processing in my system. I have a problem in recognition of ENVI file in Imagine. if i open any envi file that it registered in Datum WGS 84 by ERDAS Imagine, Imagine recognized its datum and Spheroid as Clarke 1866 ! but in Envi it is WGS 84. and if i save it in Imagine then open saved file in Envi; Envi will show it as Clarke 1866 also. i do not know it is a problem in Imagine or Envi
1 1430
24 May 2008 06:35 AM
2 Replies and 1143 Views Image Processing before displying a image  1143  2 Started by  Deleted User which image Processing does ENVI do before it disply the image in display group widow when I open and load a image histogram I have a test in IDL,but the color of image is different with the one in envi display window.
2 1143
21 May 2008 08:48 AM
1 Replies and 3519 Views Variable is undefined for a compiled function  3519  1 Started by  Deleted User I'm having an issue: I've written a series of procedures and functions in IDL that I'd like to use in ENVI. They all work nicely in IDL, and I've saved them with (save, /routines) and put them in the ENVI save-add folder. I open ENVI and check all the compiled functions/procedures, and indeed, my programs are all present and accounted for. However, when I run the scripts, one of my compiled functions (named 'exclude') always breaks and I get the error: Variable is undefined: EXCLUDE. ...
1 3519
20 May 2008 05:33 PM
1 Replies and 1345 Views How to mask bigger image area than the screen  1345  1 Started by  Deleted User This time I am planning to mask an image with area of interest greater than the computer screen area. The area size is larger than the screen portion of the image. How could I do that Any options of masking is welcomed. Any quick tips is appreciated
1 1345
20 May 2008 12:50 PM
0 Replies and 1226 Views How to mask bigger image area than the screen  1226  0 Started by  Deleted User This time I am planning to mask an image with area of interest greater than the computer screen area. The area size is larger than the screen portion of the image. How could I do that Any options of masking is welcomed. Any quick tips is appreciated
0 1226
20 May 2008 12:50 PM
2 Replies and 1330 Views format convertion fail!  1330  2 Started by  Deleted User I convert a image of 4G size in ENVI standard format to TIFF format. But the result image is failed to open Does ENVI have the file size limit in format convertion
2 1330
19 May 2008 10:03 AM
2 Replies and 1461 Views NDVI analysis  1461  2 Started by  Deleted User I want to do vegetation analysis on LANDSAT data. I have no idea how to define the wave lengths. If any one could walk me through it. When i load my landsat data it doesn't give me multiple options of available bands just RGB
2 1461
19 May 2008 09:52 AM
1 Replies and 1588 Views MODIS data , turbidity index  1588  1 Started by  Deleted User I have MODIS Ocean Color L1 data which is georeferenced. Now i want to apply an algo on this data but i don't know how to apply it using envi Like in ERDAS we have modules, so what is in ENVI for it Actually, i need NIR and visible bands' pixel values , so how can i implement that in the expression using ENVI thanks in advance.
1 1588
19 May 2008 07:12 AM
2 Replies and 1149 Views How can I get the image of proper size?  1149  2 Started by  Deleted User The non-image data surrounding the actual image data is background value fill. I want to have the size of the image is same as the size of the actual image data. How can I realize it in ENVI
2 1149
17 May 2008 05:48 AM
1 Replies and 1221 Views Programmatic opening of annotation overlay  1221  1 Started by  Deleted User Hi, I have written an IDL script to read a custom file format and parse annotation data into a separate .ann file using ENVI_USER_DEFINED_ANNOTATION. I would like to overlay the annotation over the newly displayed image automatically at the end of the script without having to manually File->Restore annotation, is there any way to do this. As a relatively similar example of what Im trying to do, when an NITF file is loaded the composite virtual mosaic bands display the image and overlayed ...
1 1221
13 May 2008 03:33 PM
1 Replies and 1479 Views Linear Spectral Unmixing  1479  1 Started by  Deleted User Hi all, Could anyone in the forum please tell me how to exclude the background cell (value R:0, G:0, B:0) in unmxing the spectral input images I used the linear spectral unmixing tool in ENVI 4.2.; I then displayed the fractional images, using the cursor location/value and found that the background cell has value. They are also included in statistics calculation. I want to exclude them. How should I do it Thank you very much. Kind regards, Thu
1 1479
03 May 2008 07:05 PM
1 Replies and 1316 Views Linear spectral unmixing  1316  1 Started by  Deleted User I performed linear spectral unmixing on my data and now I'm looking for a way to select the dominant type of each endmembers between the new bands created. Basically I want to form a new image with the dominant endmembers and be able to attibute a different color to each endmembers. Thanks for any help or info
1 1316
03 May 2008 07:05 PM
1 Replies and 1332 Views Looking for Implementaiton of Fully Contrained Spectral Linear Unmixing  1332  1 Started by  Deleted User Does anyone have ENVI/IDL code that performs fully constrained (sum to 1 and abundances between 0 and 1) spectral linear unmixing The unmix_doit procedure in ENVI only incudes a sum to 1 constraint (whereas abundance values can be both negative and well above 1). Cheers, Luk Arbuckle
1 1332
03 May 2008 06:57 AM
2 Replies and 1087 Views Spectral Angle Mapper Endmembers  1087  2 Started by  Deleted User I don't know if anyone is familiar with Spectral Angle Mapper Classification, but I am trying to find the endmembers of the image in order to run SAM classifier. From what I understand I need to use the Pixel Purity Index and MNF to run in the n-d visualizer in order to find the endmembers to use in the classifier I tried this and the results from the n-d visualizer are strange, and I'm unable to save the endmembers to upload in the classifier.
2 1087
01 May 2008 07:20 AM
1 Replies and 1974 Views Error using reg_warp_doit / envi_register_doit  1974  1 Started by  Deleted User Hi all, I have inherited some code from ENVI 3.2/3.5 days which makes use of 'reg_warp_doit'. But, running the program in the current version that I have (ENVI 4.3) yields the error: reg_warp_doit: An error has occured during processing Error: 'FZ_ROOTS: too many iterations in laguer.' The result may be invalid. I tried to look up as to when this function became obsolete (cuz I cannot find it in the current documentation) and what I might replace it with, but came up with naught. Then I ...
1 1974
01 May 2008 12:04 AM
1 Replies and 1287 Views output rule image  1287  1 Started by  Deleted User What is the meaning of 'data' (cursor location/value) when we are working with output rule image
1 1287
29 Apr 2008 03:21 AM
1 Replies and 1604 Views Usability of MapInfo and Geo Points from ENVI Headers  1604  1 Started by  Deleted User I'm importing ENVI data files into third party analysis software and have questions on the usability of the geo location info in the ENVI headers. The header keyword 'map info' contains the geo location for the upper left pixel and the pixel width and height. The ENVI documentation (Getting Started with ENVI, Working with Header Files) says the reference pixel x and y locations are in file coordinates (defined as zero-based, i.e., first pixel 0,0), but gives examples with value of 1,1 for fi...
1 1604
28 Apr 2008 01:04 PM
0 Replies and 1408 Views Remove cloud in ENVI  1408  0 Started by  Deleted User Can someone give me a solution for cloud removing Can i use ROI to build masks of cloud-covered areas and then apply those masks (which i change the spectral features) on my images to permanently remove cloud from them If it's possible, please tell me how i can change the spectral features of ROIs to match with other features which i want them to be. Thanks in advance.
0 1408
26 Apr 2008 03:21 AM
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