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0 Replies and 1390 Views
MATH_DOIT multiple equations 1390 0
Started by Deleted User
The code below works for one equation using math_doit. How could I do multiple equations on multiple images in a folder. Fow example the below code calculates NBR from (b9-b24)/(b9b24) and outputs a filename with filename_NBR. How could I also get NDVI from (b9-b5)/(b9-b5) and have it output as filename_NDVI.
Thanks
&160;
pro bandmath_NBR
compile_opt idl2
input_path = 'E:\FinalProcessing\GrassValley_Slide\georef_atcoroutput\'
cd, 'E:\FinalProcessing\GrassValley_Slide\burn_i...
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1390 |
17 Aug 2009 05:14 PM |
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2 Replies and 1736 Views
ENVI_OUTPUT_TO_EXTERNAL_FORMAT 1736 2
Started by Deleted User
I would like to use ENVI_OUTPUT_TO_EXTERNAL_FORMAT to save some ENVI files into various formats (ESRI GRID and tiff). See below for the code I am using. I keep getting an error on my endfor and end, not sure what I am doing. Thanks
pro outputtoexternalfile2
compile_opt strictarr&160;
ENVI, /RESTORE_BASE_SAVE_FILES
;set up path to input and output files
input_path = 'E:\test\'
&160;&160;&160; ; search for data files in the specified directory
&160;&160;&160; fi...
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2 |
1736 |
17 Aug 2009 05:07 PM |
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1 Replies and 1701 Views
custom .cfg file 1701 1
Started by Deleted User
I just realized that this is&160; a seemingly simple question that i do not know the answer for :(
If you write out some preferences to a custom .cfg file, how do you make envi read that file and not the default envi.cfg
I've got a user accessing envi over a network, so the default will always be there.&160;
Any help would be appreciated.
Jeff
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1 |
1701 |
17 Aug 2009 12:44 PM |
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2 Replies and 1553 Views
Orthorectification Georefereferencing 1553 2
Started by Deleted User
Dear all
&160;
I hope you can gelp me with this. I just run an orthorectification on a Spot 2 image using a DEM on ENVI 4.5. It improved the positioning of the image considerably, but there are some areas of the image that are still not so good. I was thinking on running georeference the image with a vector layer to correct this areas. Do you think this a good way to go
&160;
The orthorectification on ENVI 4.5 has either the option of using GCPs or DEM but no to use both together as in EN...
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2 |
1553 |
15 Aug 2009 01:10 PM |
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3 Replies and 1324 Views
Radiometric correction 1324 3
Started by Deleted User
Dear all
&160;Dear all
I hope you can assist me on this matter.
Currently, I am working to generate a land cover map of my study site at the north-east end of the Venezuelan Andes. For this I am planning to use 3 Spot 2 images and 2 Spot 5 images. I need your advice regarding radiometric correction, before joining all this images in a mosaic for the supervised classification.&160;
The 3 Spot 2 images are from the same date and contiguous sites, so in principle I don't think I n...
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3 |
1324 |
14 Aug 2009 05:27 AM |
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0 Replies and 1407 Views
Display ROIs by launch of ROI tool from script 1407 0
Started by Deleted User
I am using the (undocumented) function DISP_ROI_TOOL_INIT to launch the ROI tool and display ROIs from a script. When I have two display groups open (with images of the same dimensions), I can not find out how to make a certain ROI show in only one of the display groups. Can anybody help me I.e., I would like to show different ROIs in different display groups, and not all ROIs in all display groups.
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1407 |
13 Aug 2009 06:38 AM |
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0 Replies and 1588 Views
Is ASTER image suitable for identifying groundwater discharge under sea? 1588 0
Started by Deleted User
&160;
&160;Dear ENVI users,
Basically, I am aiming to identify the groundwater discharge under the sea not along the coastal line.
&160;
I am planning to order an ASTER image that helps me out to identify the groundwater discharging (springs)&160;under the sea.&160; Meanwhile, I am not sure which type of ASTER image is suitable for myproject. Basically I am trying to identify a plume based on temprature contrast using ASTER image&160;with better pixel resolution than landsat therma...
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1588 |
13 Aug 2009 06:28 AM |
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2 Replies and 1961 Views
ASTER albedo image 1961 2
Started by Deleted User
Hello,
I have atmospherically corrected an ASTER image over a glacier surface to produce reflectance data.
Now I need to get an albedo image with values ranging from 0 to 1.
I understand that reflectance is equal to albedo but FLAASH values ranges from -12 to 8213.
Many thanks
pzneteno
&160;
&160;
&160;
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2 |
1961 |
12 Aug 2009 03:28 PM |
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1 Replies and 1364 Views
how to identify groundwater discharge( springs) flowing to sea beneath the coastal line 1364 1
Started by Deleted User
I have got a new project that&160; aims to identify the springs discharging to sea along the coastal area, Western Victoria, Australia. which image is suitable to identify the springs beneath the surface along the coastal inle&160; Landsat (thermal band) or ASTER image&160; Could there be a possibilty to identify the springs without converting the DN to radiance and again to temprature, just by merely stretching the DN using the thermal band of landsat
I would appareciate if you assist me...
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1 |
1364 |
11 Aug 2009 12:49 AM |
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1 Replies and 2059 Views
band math - replace values 2059 1
Started by Deleted User
Normal
0
MicrosoftInternetExplorer4
I have an image where all the edges have been assigned a value, for example -999, and all other values are DN greater than zero. I would like to add the -999 part of my image (so all the edges) to another image but not add all the DN values.
Does anyone know a way I could do this
For example I firstly stack the two images, where:
B1 is the image with the -999 edges
B2 is the image I would like to keep all original values but ...
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1 |
2059 |
10 Aug 2009 06:15 PM |
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1 Replies and 1859 Views
Data type overflow using Band Math 1859 1
Started by Deleted User
Hi everybody, first of all sorry for mi English ;)
I'm working with DN and I want to use this expression:&160; 1.017*DN -4.180 for band 1.&160; I've thougth to use this:
byte( 1.017*b1-4.180) but I have the problem that if DN is, for example, 2, using that expresion it becames&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160;&160; -2 --> 253, and&160; want that the minimun value was 0
I've read ENVI help but I have no idea how to solve this.
Thanks...
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1 |
1859 |
06 Aug 2009 11:55 AM |
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0 Replies and 1409 Views
Orthorectification ENVI 4.5 1409 0
Started by Deleted User
Dear all
&160;I am orthorectifying some Spot and Landsat images for my study site with ENVI 4.5, and I have a few questions regarding the correct workflow and some important details:
1) A total of 5 Spot images and 4 Landsat make the picture for my study site. So I was wondering if I should carried out the radiometric correction and the fusion of the images prior to the orthorectification, or I can do the orthorectification for each one, and the carry out the other corrections and the mosaic ...
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1409 |
06 Aug 2009 06:16 AM |
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1 Replies and 1363 Views
ENVI_PICKFILE, /MULTIPLE_FILES 1363 1
Started by Deleted User
hi all,
its may be a simple question again, but i cann't get a solution. in the envi help there is no example for this.
ok....i want to filter multiple files with adapt_filt_doit but it doesn'n work and i am sure, that anybody of you can help me very quickly.
here the example code:
pro filter3
compile_opt STRICTARR
&160; ;
&160; ; First restore all the base save files.
&160; ;
envi, /restore_base_save_files
ENVI_INIT, /batch_mode
&160; ;
&160; ; Open the ...
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1 |
1363 |
05 Aug 2009 01:40 AM |
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0 Replies and 1516 Views
FLAASH/MODTRAN question 1516 0
Started by Deleted User
I would like to know if the FLAASH/MODTRAN model can process images before 1986 for Landsat TM5 data The interface will not allow me to enter years before 1986.
Thanks,
Andrea
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1516 |
01 Aug 2009 10:32 PM |
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0 Replies and 1630 Views
setting Default directories on Windows for ENVI 1630 0
Started by Deleted User
I'm using ENVI 4.6.1 on XP. I'd like to be able to set the default directories so that they are always the current directory that I'm in, i.e. if I open a file in a directory then I want that directory to be the default for any files I save.
I could do this on Unix using ./
thanks,
matthew
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0 |
1630 |
31 Jul 2009 01:33 PM |
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1 Replies and 1818 Views
Georeferencing MODIS from lat/long data 1818 1
Started by Deleted User
Currently I am working with an output from SeaDas that is not a standard *.L2 product.&160; Because of this it currently does not work with the MODIS conversion kit and EPOC.&160; Though I am working with the author of those scripts and we may have found a way around it I was still curious to know if you could georeference a file from lat/long data.&160; The *.L2 output includes a band representing latitude valudes for the image and likewise for longitude.&160; Can you programmically use the...
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1 |
1818 |
30 Jul 2009 09:54 AM |
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0 Replies and 1499 Views
MWIR -reflectance component 1499 0
Started by Deleted User
What tools can I use in ENVI to eliminate the emission component of a midwave-infrared band (3-5 micrometers) so that I just have the band reflectance Any feedback will be greatly appreciated.
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0 |
1499 |
29 Jul 2009 06:47 PM |
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1 Replies and 1446 Views
Temp lost projection 1446 1
Started by Deleted User
I am trying to calculate brightness temperature using the tools in ENVI. My input has been georeferenced, but my output appears to have lost its projection. Could someone please let me know what I need to do to fix this. Thank you
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1 |
1446 |
28 Jul 2009 04:26 PM |
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2 Replies and 1028 Views
raster statistics using a complex vector 1028 2
Started by Deleted User
I am still having difficulties calculating the statistics of a raster within a polygon. I am using Basic Tools - Statistics&160; - Compute Statistics, then choosing a .evf or ROI file as stats subset. The method works fine with a simple polygon but I have a very complex polygon and it crashes each time I try to use it. Is there another way I could do this
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2 |
1028 |
27 Jul 2009 09:47 AM |
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0 Replies and 1575 Views
ENVI LiDAR Toolkit - Convert Ascii Data to LAS 1575 0
Started by Deleted User
When I try to "Convert Ascii Data to LAS" using the ENVI LiDAR Toolkit, the toolkit does not seem to work well. When there are 3 ~ 6 columns of data in the ascii file, the output LAS file will only use the first 3 columns of data to create a LAS file, and no dialog would appear for me to do the "Data Selection": the LAS file with the same name to the input ascii file is created automatically.
If there are 1 or 2 columns of data in the ascii file, an error would occur:
S...
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0 |
1575 |
24 Jul 2009 09:29 PM |