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1 Replies and 1893 Views
high errors and georeferencing 1893 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...
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1 |
1893 |
30 May 2008 12:22 PM |
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1 Replies and 1382 Views
failed to get dims..... 1382 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)...
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1 |
1382 |
26 May 2008 03:34 PM |
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1 Replies and 1755 Views
Envi file with Datum WGS 84 read as Clarke 1866 in Imagine Erdas 1755 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
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1 |
1755 |
24 May 2008 06:35 AM |
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2 Replies and 1478 Views
Image Processing before displying a image 1478 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.
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2 |
1478 |
21 May 2008 08:48 AM |
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1 Replies and 3904 Views
Variable is undefined for a compiled function 3904 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.
...
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1 |
3904 |
20 May 2008 05:33 PM |
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1 Replies and 1637 Views
How to mask bigger image area than the screen 1637 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
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1 |
1637 |
20 May 2008 12:50 PM |
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0 Replies and 1516 Views
How to mask bigger image area than the screen 1516 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
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0 |
1516 |
20 May 2008 12:50 PM |
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2 Replies and 1650 Views
format convertion fail! 1650 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
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2 |
1650 |
19 May 2008 10:03 AM |
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2 Replies and 1954 Views
NDVI analysis 1954 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
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2 |
1954 |
19 May 2008 09:52 AM |
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1 Replies and 1937 Views
MODIS data , turbidity index 1937 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.
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1 |
1937 |
19 May 2008 07:12 AM |
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2 Replies and 1491 Views
How can I get the image of proper size? 1491 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
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2 |
1491 |
17 May 2008 05:48 AM |
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1 Replies and 1553 Views
Programmatic opening of annotation overlay 1553 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 ...
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1 |
1553 |
13 May 2008 03:33 PM |
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1 Replies and 1818 Views
Linear Spectral Unmixing 1818 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
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1 |
1818 |
03 May 2008 07:05 PM |
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1 Replies and 1760 Views
Linear spectral unmixing 1760 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
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1 |
1760 |
03 May 2008 07:05 PM |
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1 Replies and 1651 Views
Looking for Implementaiton of Fully Contrained Spectral Linear Unmixing 1651 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
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1 |
1651 |
03 May 2008 06:57 AM |
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2 Replies and 1442 Views
Spectral Angle Mapper Endmembers 1442 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.
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2 |
1442 |
01 May 2008 07:20 AM |
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1 Replies and 2306 Views
Error using reg_warp_doit / envi_register_doit 2306 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 ...
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1 |
2306 |
01 May 2008 12:04 AM |
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1 Replies and 1698 Views
output rule image 1698 1
Started by Deleted User
What is the meaning of 'data' (cursor location/value) when we are working with output rule image
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1 |
1698 |
29 Apr 2008 03:21 AM |
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1 Replies and 2009 Views
Usability of MapInfo and Geo Points from ENVI Headers 2009 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...
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1 |
2009 |
28 Apr 2008 01:04 PM |
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0 Replies and 1759 Views
Remove cloud in ENVI 1759 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.
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1759 |
26 Apr 2008 03:21 AM |