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3 Replies and 1198 Views
Maximum Pixel Value 323 after Mosaicking 2 files? 1198 3
Started by Deleted User
Hi,
I just realized, that after i ve done the mosaicking process with two files (which each has a maximum pixel value of 255), i get Maximum Values on the mosaicked picture of 323.256042.
What does this mean and how is it possbile
(i mosaicked a slc-on and slc-off file together, landsat 7 - through color mapping i can see that the values over 255 are in the gap filled sectors)
kind regards k.chien
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3 |
1198 |
11 Mar 2012 11:02 AM |
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1 Replies and 1234 Views
Quality accuracy, ENVI Zoom 1234 1
Started by Deleted User
Hi.
I am working on a classification based on QuickBird images, and I'm using the feature extraction-guide by ITTvis. However, I can not find an obvious way to make a quality control of my classification (confusion matrix). Can any of you give me some hints/ideas
Thank you in advance
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1 |
1234 |
10 Mar 2012 11:18 AM |
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3 Replies and 1304 Views
3D view in ENVI 1304 3
Started by Deleted User
I have a DEM, ASTER, and geological map (GIS layer) of an area.
I would like to create a 3D view from this. I can create that possibly by combining them.
Is this possible in ENVI
Regards
Yask
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3 |
1304 |
09 Mar 2012 02:33 PM |
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2 Replies and 1283 Views
compare/classify different gap fill methods for landsat 1283 2
Started by Deleted User
hi there,
being a new user to landsat, there are a few questions i have, and will be lucky about any suggestions and answers.
what i need to know, is how can i compare/classify 4 different hdr files of the same regions (single bands only), which each has been already gap filled wtih a different method (mosaicking, add on local vs global, replace bad value).
for every method the same slc-on and slc-off files were used. I want now to classify them and compare which resulting ...
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2 |
1283 |
09 Mar 2012 11:56 AM |
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1 Replies and 1365 Views
DN to radiance for FLAASH input 1365 1
Started by Deleted User
Hi,
I am working with L5 TM and P6 LISS III. I intend to aplly FLAASH in the images.
So, the input image in FLAASH is radiance.
For Landsat 5 TM I can do this directly on ENVI menu (calibration utilities) filling the solar elevation and date parameters.
But for P6 LIS III there aren't any directly option (I guess). So, I can calculate the radiance from DN using the equation:
Lmin &91(Lmin Lmax)*Qcal/Qcalmax&93
This equation will return a radiance image. But, in the e...
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1 |
1365 |
09 Mar 2012 07:01 AM |
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0 Replies and 1383 Views
envi_stats_doit error - ROIS 1383 0
Started by Deleted User
Dear all,
I am using ENVI IDL 4.8 and the ROI tool to calculate statistics from a raster (*tif, 500m pixel spacing)
Having overlaid the ROI to the image I use "stats" from ROI tool; however I get the following error:
envi stats doit: An error has occurred during processing
Error: "Out of range subscript encountered: ADDR. "The result may be invalid"
Any ideas
Regards
Dimitris
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0 |
1383 |
07 Mar 2012 08:55 AM |
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3 Replies and 1291 Views
Using FLAASH on a Geoeye-1 image 1291 3
Started by Deleted User
Hello,
I'm trying to make a radiometric correction of a Geoeye-1 image using ENVI 4.8 and FLAASH. Due to the lack of an automatic method to transform Digital Values to Radiance, I want to do it by myself applying the formula:
Lλ = Gainλ *DNλ Offsetλ
where λ is Specific spectral band of image: Near-IR, Red, Green, Blue or Panchromatic.; Lλ is Spectral radiance for band λ at the sensor’s aperture (mW/cm2/μm/str); Gain...
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3 |
1291 |
07 Mar 2012 04:15 AM |
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1 Replies and 1184 Views
PCA again 1184 1
Started by Deleted User
band1 band2 band3
band1 0.3 -0.6 0.2
band2 -0.4 0.5 0.1
band3 .... .... ....
is it means below format
band1 band2 band3
PC1 0.3 -0.6 0.2
PC2 -0.4 0.5 0.1
PC3 .... .... ....
thank you very much!
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1 |
1184 |
03 Mar 2012 09:04 PM |
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1 Replies and 1198 Views
PCA 1198 1
Started by Deleted User
Hi,
My data (multispectral) has some background which I have assigned Nan. I am doing PCA for the whole region, and some subsets. The scatter plot' nature (using same PCA bands), and color composite images (using PCA bands) are different for these different regions. Is it true If I want to check whether my PCA is coming ok or not, how can I cross-checked
Regards
Guneshwar
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1 |
1198 |
02 Mar 2012 02:05 PM |
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0 Replies and 1316 Views
Creating time series analysis tools for ENVI 1316 0
Started by Deleted User
Greetings,
As some of you know I have created a number of command-line based PRO files which I use in my processing of time series Terra-MODIS derived NDVI and NDWI imagery. Due to the number of requests that I have received from others for these files, I am thinking it time to begin developing a set of tools that can be shared amongst ENVI users and applicable for a number of different data sets (8-bit Terra and Aqua data, daily, 8, 16, and other max data, eMODIS data, etc..).
...
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0 |
1316 |
27 Feb 2012 02:02 PM |
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1 Replies and 1307 Views
Enhanced Vegetaion Index 1307 1
Started by Deleted User
Hi I'm new to using ENVI and I would like to produce a vegetation index. I have SPOT imagery but am time poor so I dont want to carry out a supervised classification. I have produced an NDVI but I would like to make an EVI to compare it to. Can anyone tell me how to go about it
Many Thanks
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1 |
1307 |
22 Feb 2012 05:09 PM |
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0 Replies and 1092 Views
Extracting single band 1092 0
Started by Deleted User
Hi guys, i found some similar topic, which was solved by a programming code.
But what i need to know is way more simple (and honestly i have done it before) but somehow its not working out right now.
So i have a landsat HDR file with two bands (they show separate in the "available band list" when i unfold the .hdr file)
But for some landsat gap fill methods, i need them to stand alone, how can i extract a single band into a new file
big thanks in advance f...
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0 |
1092 |
22 Feb 2012 04:28 PM |
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2 Replies and 1806 Views
Extracting single band 1806 2
Started by Deleted User
Hi guys, i found some similar topic, which was solved by a programming code.
But what i need to know is way more simple (and honestly i have done it before) but somehow its not working out right now.
So i have a landsat HDR file with two bands (they show separate in the "available band list" when i unfold the .hdr file)
But for some landsat gap fill methods, i need them to stand alone, how can i extract a single band into a new file
big thanks in advance f...
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2 |
1806 |
22 Feb 2012 04:28 PM |
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1 Replies and 1326 Views
E3DE lidar software 1326 1
Started by Deleted User
anyone who can sent me the E3DE software setup file.thanks a lot.my e-mail: mykamenergmail.com
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1 |
1326 |
18 Feb 2012 12:18 AM |
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5 Replies and 2472 Views
Setting data ignore to ******** values 2472 5
Started by Deleted User
I have some imported MODIS images which have ***** as the pixel values (not entirely sure what this is -- NaN Inf) I'd like to set this as the data ignore value in the header to get it to display properly, rather than having to generate a mask. Any ideas
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5 |
2472 |
16 Feb 2012 12:41 PM |
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2 Replies and 1495 Views
Creating a virtual stacked image 1495 2
Started by Deleted User
Greetings,
As some of you know, I work with time-series data and have even written a couple of tools for this purpose with my somewhat limited IDL skills. One issue I have with my processing is that I spend a lot of time stacking data, as I need to sometimes update the image stacks once a month or every two weeks. This approach uses up a lot of time and twice the storage space as necessary. I have noticed that ENVI can stack imagery without actually having to write to the disk, as evid...
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2 |
1495 |
13 Feb 2012 08:41 PM |
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4 Replies and 1442 Views
QuickBird 16 Bit 1442 4
Started by Deleted User
Hello,
I'm trying to do some processing on 16 bit QuickBird Imagery and I'm getting incorrect values. So, QuickBird's sensor reads the images as 11 bit (DN range 0-2048) and either stores them as 8 bit (DN range 0-256) or 16 bit (DN range 0-65536). I've been reading that I might need to tell ENVI the true values of the imagery( i.e. 0-2048). Should I do this in ENVI and if I do what is the process
Thanks
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4 |
1442 |
13 Feb 2012 09:00 AM |
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0 Replies and 2408 Views
Neural Network Classification 2408 0
Started by Deleted User
Hi all,
I am postgraduate student which done research on cloud classification. I have some problem regarding on classification technique in ENVI. I want to use neural network classifier provided in ENVI 4.7. However, there appear some error after the processing. Can anyone help me
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0 |
2408 |
13 Feb 2012 01:10 AM |
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4 Replies and 1454 Views
Neural Network Classification 1454 4
Started by Deleted User
Hi all,
I am postgraduate student which done research on cloud classification. I have some problem regarding on classification technique in ENVI. I want to use neural network classifier provided in ENVI 4.7. However, there appear some error after the processing. Can anyone help me
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4 |
1454 |
13 Feb 2012 01:07 AM |
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0 Replies and 1582 Views
problem adding derivative plot function 1582 0
Started by Deleted User
Hi,
I want to add the capability of derivative plot function to the program. So, I followed the instruction at http://www.exelisvis.com/portals/0/tutorials/envi/Plot_Functions.pdf step by step successfully and added "pf_1st_derivative", and "pf_2nd_derivative" functions, but I get an error whenever using these functions. the error says they are undefined function.
I get the same error even when I run them inside IDL, so I guess the problem is because of the code itsel...
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0 |
1582 |
12 Feb 2012 09:54 AM |