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1 Replies and 1794 Views
How to compute for variance, covariance, and means of ROIS 1794 1
Started by Deleted User
Hello, Im a newbie here.
I havent figured out how I may compute for the means and variances of my ROIs. Is it in the compute stats I would also like to derive the covariances of my ROIs.
Thank you!
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1 |
1794 |
20 Sep 2008 03:35 AM |
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1 Replies and 1629 Views
Combining MODIS bands 1, 2 (250m) and 3,4,5,6,7 (500m) 1629 1
Started by Deleted User
Hi guys,
Has anybody successfully combined these MODIS spectral bands into the same 250m pixel resolution using ENVI I tried processing MOD09 products using Tools-resize (to 250m pixel res); Map-convert projection and layer stacking but the end result only showed an outline of the land area which I find odd as the reprojected and resampled bands were consistent.&160;
I tried using the MODIS conversion and Toolkit but I kept running into memory allocation problems.
Any suggestions Thanks......
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1 |
1629 |
18 Sep 2008 08:24 AM |
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1 Replies and 1073 Views
Using the pixel purity index on masked images 1073 1
Started by Deleted User
I have been trying to use the ppi tool on a coastal&160;image which has the water masked out. I continually get an output which highlights&160;all the&160;masked pixels (which have a&160;value of zero)&160;as spectrally pure when&160;I thought it would ignore&160;these pixels altogether. Someone told me to try and mask out all the NaN values but when I run that&160; it masks out&160;the entire&160;image as opposed to just the blacked out areas. Does anyone know how to get the ppi tool ...
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1 |
1073 |
17 Sep 2008 04:54 PM |
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3 Replies and 1530 Views
Seadas HDF export to ArcGIS format 1530 3
Started by Deleted User
Hi:
I am currently working with MODIS 4 KM Level 3&160;images of K490. The product is in HDF format and I can open it in ENVI 4.4. The values are for global data so I make a subset using the Regions of Interest. The problem is that I cannot&160; export the data in a format that is viewable in ArcView 9.3. I have tried th arcview raster format, ESRI grid format.
In the ArcView raster format the extension is .bil, but the exported file does not contain the Map Information from ENVI, so I can p...
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3 |
1530 |
15 Sep 2008 09:28 AM |
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0 Replies and 1219 Views
DEM Extraction with HiRISE 1219 0
Started by Deleted User
Hello,
&160;
&160;Does anyone have already tried the dem extraction modul for HiRISE stereo pair and thus get dem
&160;
Thanks for feedback,
&160;A.
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1219 |
11 Sep 2008 06:03 AM |
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5 Replies and 1516 Views
How to use new AVIRIS Data format? 1516 5
Started by Deleted User
Hi everyone,
I'm very new in using ENVI and i need some help :) The thing is i've downloaded the "moffett field" data from the AVIRIS's website. The package has some data files like:
.eng, .nav, .rfl&160; etc...
&160;I want to open the rfl(AVIRIS INVERTED REFLECTANCE IMAGE DATA) file but i haven't come up with the solution. I use the menu :
Open Image File --> (Select the First Scene File) "f970620t01p02_r03_sc01.a.rfl"&160; (The file size is 140,836,864 bytes.) --> En...
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5 |
1516 |
11 Sep 2008 01:51 AM |
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1 Replies and 1116 Views
Reclassification 1116 1
Started by Deleted User
Hi,
I need to reclassify image, so I downloaded reclass.pro and saved it in proper directory but I can't use it. I wrote the function in band math but it said-&160;&160;'You have entered an invalid expression. Check for syntax errors or undefined procedures and functions and try again.'
Would u help me, how to use it.
&160;
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1 |
1116 |
05 Sep 2008 06:41 AM |
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2 Replies and 1304 Views
I want to know how to dowload ENVI Toolkits & Plugins of 'The MODIS Conversion Toolkit' 1304 2
Started by Deleted User
I want to know how to dowload ENVI Toolkits & Plugins of 'The MODIS Conversion Toolkit'.&160; Now I know we can go to this website (http://www.ittvis.com/Downloads/toolkits.aspx) to download it. But I can't get it . Evry time , that server gave me the following page(http://www.ittvis.com/codebank/search.aspFID=485).&160;&160;Are &160;there&160; some one to tell me how to get it. Thank you!
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2 |
1304 |
04 Sep 2008 01:57 AM |
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0 Replies and 1152 Views
change default lookup table for grayscale image 1152 0
Started by Deleted User
Dear Sir,
I am currently doing some image processing in ENVI. I was wondering if&160;there is some way to change the default color look up table for grayscale image Coz I prefer to work with BLUE/GREEN/RED/YELLOW which is able to show more contrast.
And by the way, is there a way to call up the interactive stretching window automatically through programming or something
Any help or suggestion is appreciated.
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0 |
1152 |
03 Sep 2008 08:14 PM |
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3 Replies and 1352 Views
radiance & brightness temp. from ASTER L1A 1352 3
Started by Deleted User
I've purchased ASTER L1A image and now I'm stuck how to calculate radiance and brightness temp from it. I have ENVI, ERDAS 9.1 and ArcGIS 9.2. If anyone knows how to calculate these then please help me, I've tried many formulas but none of them give the desired results. the temperature needs to be calculated from TIR bands only.
Basic process is the convertion from L1A --> L1B, which i dont know :(
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3 |
1352 |
03 Sep 2008 11:57 AM |
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1 Replies and 1119 Views
sarscape 1119 1
Started by Deleted User
Dear all,
I am using ENVI4.4, I just download a SARscape4.0 for ENVI 4.4 version. But how to install it I run "setup" program, it told me can't find install directory. Where can I get a kind of help book for installation Thank you!
With kind regards
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1 |
1119 |
02 Sep 2008 12:21 AM |
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1 Replies and 1194 Views
segmentation 1194 1
Started by Deleted User
Dear all,
I am studying of ENVI for dealing with SAR data. I run 'segmentation images', the result either white or black, is that ENVI segment image in this way, by using threshold, the result is more like a classification result. I got confused.
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1 |
1194 |
01 Sep 2008 04:01 AM |
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1 Replies and 1195 Views
widget windows not working 1195 1
Started by Deleted User
Hi,
&160;
I'm using windows and ENVI 4.4 IDL 6.4.1 and I'm having some issues with widget windows that I don't know how to fix.&160; Basically after I'm working in ENVIIDL for a while the windows stop working.&160; When I do anything that would create a new window, such as file> open image file, a new window doesn't open until I close another open window.&160; This all seems to happen after using iplot to make a surface plot.&160; I've tried to work thourgh it which has led to some ipl...
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1 |
1195 |
29 Aug 2008 09:22 AM |
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2 Replies and 1085 Views
FLAASH - Aircraft hyperspectral data 1085 2
Started by Deleted User
Greetings
I am trying to run an aircraft hyperspectral dataset through FLAASH. I set the file type to unknown-hsi, then select the input radiance file, and also provide the ASCII center wavelength and fwhm file, defining the columns with the dialog. After doing this, the unknown-hsi switches to unknown-msi sensor type.
After filling the remaining model input parameters, then selecting "apply", I get an error opening filter function file message. I have done the same type procedure wi...
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2 |
1085 |
26 Aug 2008 02:19 PM |
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0 Replies and 1029 Views
texture occurence and co-occurence filter formula's 1029 0
Started by Deleted User
Dear support staff,
At the moment I am writing a paper about an approach to incorporate combinations of texture filters into the classification process.&160;Therefore I use most of the&160;available occurence and co-occurence texture filters available in ENVI (4.4). However, I cannot find the mathematical formula's&160;on which these texture filters are based in the ENVI help. In various literature are examples of formula's, but I am not sure ENVI uses these exact formula's. It is especial...
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1029 |
26 Aug 2008 12:44 PM |
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1 Replies and 1317 Views
authomatize process 1317 1
Started by Deleted User
I need to classify hundreds of&160;images with a classification tree. I do not want to spend my time processing one by one so I would like to know how I can authomatize this process.
Thank you.
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1 |
1317 |
25 Aug 2008 11:16 AM |
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3 Replies and 2303 Views
Unable to allocate memory: to make array. Not enough space 2303 3
Started by Deleted User
Hello!
I'm working with IDL/ENVI in the processing of TerraSAR Images
When I run my program I obtain the error:
"Unable to allocate memory: to make array. Not enough space"
The error occurs when I try to make this instruction:
LocalThresholdResultsFinal = &91&91LocalThresholdResultsFinal&93, REPLICATE({LocalThresholdResultsFinal}, IndTmpGrowSize&911&93)&93
where
LocalThresholdResultsFinal = {LocalThresholdResultsFinal, ind:UINTARR(2, 1),CFARResultsNmog:0L, CFARResultsPar...
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3 |
2303 |
25 Aug 2008 09:16 AM |
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0 Replies and 1067 Views
Sea Mask? or other way? 1067 0
Started by Deleted User
Good morning!
I'm going to show you my work with the MODIS Images. By making a co-register on a basic image , i'll obtain many mistakes about very high RMS and given that the major mistakes are in the CGP located in the sea. I'd like to make a Sea Mask to be superimposed on every image whitch has been noticedat different moments to solve this problem. Then i'll co-register them.
Images are about the mediterran sea, could you help me to make a sea mask are there appropriate functions in envi...
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1067 |
18 Aug 2008 09:15 AM |
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1 Replies and 1127 Views
Floating point Exception error when triggering IDL or ENVI 1127 1
Started by Deleted User
Hi All,
I downloaded and installed ENVI 4.5 - Linux Intel x86, 32 & 64-bit (glibc ver 2.5, gtk2 ver 2.10, kernel ver 2.6' from ITT download website. I followed the instructions to install and finished the installation. I work in a university and I had to direct the license to point to a license server.
It gives a error called Floating point exception. I even tried running it as 'ide -32' or 'envi -32'. It is not working. Can anybody suggest a solution
Thanks
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1 |
1127 |
14 Aug 2008 08:33 PM |
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0 Replies and 1174 Views
Pixel aggregate problem 1174 0
Started by Deleted User
Good morning at all
I need to resample a classified SPOT image at 10m of pixel resolution to 100m.
For that I use the function 'Pixel aggregate' form the menu 'Basic tools' > 'Resize data parameters', instead of Nearest neighbor because the results are better for me BUT I noticed that around some classes, like clouds (in white colors), appear after the conversion new pixels that aren't absolutely not present in the original position (like blue pixels > classed as water, present but far away o...
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1174 |
14 Aug 2008 08:55 AM |