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1 Replies and 2085 Views
global spatial statistics: semivariogram 2085 1
Started by Deleted User
I would like to know how the semivariance is calculated in ENVI's global spatial statistics. Which pixels are involved ie, Is the output the result of it being calculated along 1 long transect or is it the average of multiple transects or a matrix
What does the neighbourhood rule control I am confused as to what is meant by the 'central pixel' and that relates to the calculation of semivariance. Is a moving window involved
Thanks!
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1 |
2085 |
08 May 2007 01:17 PM |
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0 Replies and 1209 Views
Spectral Derivative with ENVI 4.2 1209 0
Started by Deleted User
Hi everyone,
I downloaded the spectral derivative tool from the following url: http://www.ittvis.com/codebank/search.aspFID=77
I included this .sav file in the ENVI 4.2 save/add folder. After re-booting computer and launching ENVI, 'spectral derivative' appears under the 'transform' and 'spectral' menu's in the ENVI 4.2 menu bar.
When I try to use this tool I get the following error: 'Attempt to call undefined procedure/function: DERIV'
This tool works perfectly in ENVI 4.1, but I...
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0 |
1209 |
08 May 2007 11:09 AM |
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0 Replies and 1154 Views
Spectral Derivative with ENVI 4.2 1154 0
Started by Deleted User
Hi everyone,
I downloaded the spectral derivative tool from the following url: http://www.ittvis.com/codebank/search.aspFID=77
I included this .sav file in the ENVI 4.2 save/add folder. After re-booting computer and launching ENVI, 'spectral derivative' appears under the 'transform' and 'spectral' menu's in the ENVI 4.2 menu bar.
When I try to use this tool I get the following error: 'Attempt to call undefined procedure/function: DERIV'
This tool works perfectly in ENVI 4.1, but I...
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0 |
1154 |
08 May 2007 11:09 AM |
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1 Replies and 1454 Views
Spectral Derivative with ENVI 4.2 1454 1
Started by Deleted User
Hi everyone,
I downloaded the spectral derivative tool from the following url: http://www.ittvis.com/codebank/search.aspFID=77
I included this .sav file in the ENVI 4.2 save/add folder. After re-booting computer and launching ENVI, 'spectral derivative' appears under the 'transform' and 'spectral' menu's in the ENVI 4.2 menu bar.
When I try to use this tool I get the following error: 'Attempt to call undefined procedure/function: DERIV'
This tool works perfectly in ENVI 4.1, but I...
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1 |
1454 |
08 May 2007 11:09 AM |
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1 Replies and 1205 Views
Failure with FLAASH for quickbird images 1205 1
Started by Deleted User
Hi Everyone,
I failed to process quickbird with FLAASH in ENVI (4.2) and got error messages below:
**********************************************************************************
ACC error: convert7
IDL error:
End of input record encountered on file unit: 0
ACC_CONVERT7
ACC_HYPER2
ACC_ACC
ENVI_ACC_EVENT
ENVI_FLAASH_PROCESS-MANAGER
$MAIN$
**********************************************************************************
I appreciate it if someone could help me to figure ...
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1 |
1205 |
08 May 2007 08:24 AM |
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0 Replies and 1403 Views
Running ENVI on Linux, any workarounds for the segmentation fault problem? 1403 0
Started by Deleted User
Hi all,
I've recently installed ENVI 6.3 on my brand new Linux intallation (openSuSE 10.2, all the latest patches, updates etc) and I continually see the following when I try to start up ENVI:
Restored file: ENVI.
Loaded DLM: TIFF.
Segmentation fault
I briefly see a window flash up on the screen for a split second before this error appears.
I have had a bit of a search around on here and on google, and have seen a number of other posts on the subject. However, I tried a few of th...
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1403 |
08 May 2007 05:53 AM |
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1 Replies and 1305 Views
Mark an object using ENVI 1305 1
Started by Deleted User
Hi! My name is Olga, I'm a student from Russia and I start learning ENVI now.
I need to mark a punctual object, a linear object and an areal object on a picture using this programm product. Can you help me I'll be appreciate, if you do it. Thank you!
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1 |
1305 |
04 May 2007 12:47 PM |
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1 Replies and 1297 Views
Calculating satellite Zenith and Azimuth ASTER 1297 1
Started by Deleted User
Hi All,
I am trying to calculate the satellite zenith and azimuth parameters for an ASTER Level 1B image. The default values in FLAASH are Zenith: 180 and Azimuth 0. I am almost certain that these values are correct as ASTER does not have a steerable / off-nadir viewing capabilities. Are my assumptions correct I have read that the azimuth and zenith can be calculated using the satellite position and and line of sight vector information provided in the hdf parameters table. Does anyone know h...
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1 |
1297 |
04 May 2007 02:46 AM |
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0 Replies and 1272 Views
LiDAR: ASCII to LAS 1272 0
Started by Deleted User
Hello,
I'm new to LiDAR data and am trying to convert our ASCII data (with the .all extension) to LAS format in ENVI using the LiDAR tools from the code library. However when attempting to do this I get this error message:
' Subscript range values of the form low:high must be >=0,
Execution halted at: ASCIITOLAS 298 C:\RSI\IDL63\products\envi43\save_add\LiDARTools\procedures\asciitolas.pro
$MAIN$ '
The files contain 9 fields with last pulse x, y, z and i data in f...
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0 |
1272 |
02 May 2007 08:50 AM |
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0 Replies and 1320 Views
LiDAR: ASCII to LAS 1320 0
Started by Deleted User
Hello,
I'm new to LiDAR data and am trying to convert our ASCII data (with the .all extension) to LAS format in ENVI using the LiDAR tools from the code library. However when attempting to do this I get this error message:
' Subscript range values of the form low:high must be >=0,
Execution halted at: ASCIITOLAS 298 C:\RSI\IDL63\products\envi43\save_add\LiDARTools\procedures\asciitolas.pro
$MAIN$ '
The files contain 9 fields with last pulse x, y, z and i data in f...
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0 |
1320 |
02 May 2007 08:50 AM |
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1 Replies and 1332 Views
output of Flaash 1332 1
Started by Deleted User
Hi, everyone,
I use Flaash to do atmospheric correction for MODIS. Now i have a question: the output of flaash is reflectance with unitless. This reflectance is irrandiance(up) over irradiance(down), right
Thanks in advance.
Lijian
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1 |
1332 |
01 May 2007 02:53 PM |
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1 Replies and 1481 Views
FLAASH - which band centres/widths are loaded for the CASI setting / can you change them? 1481 1
Started by Deleted User
I am trying to use the FLAASH add-on to ENVI for correction of some airborne hyperspectral CASI images. The CASI sensor's bands are not fixed and it is unlikley any two users will have identical band settings.
Can anyone please tell me:
- which band centres and widths are supported by the current sensor type - hyperspectral 'CASI' setting
- can I input my own spectral library of CASI bandpass filters to use instead
Stuart
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1 |
1481 |
27 Apr 2007 06:35 AM |
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1 Replies and 1277 Views
FLAASH: Advanced settings 1277 1
Started by Deleted User
Hi all,
Following my last post, I am now correcting, the ASTER Radiance imagery using FLAASH. I have all the correct settings and through trial and error have identified the optimal 'Output Scale Reflectance Factor' value to be 10. The manual suggests a value of 10 000. When I use 10 000 I get an image that looks nothing like the input data, however, when the value of 10 is used the image resembles the input with output values ranging from around 10 to above 50 but no more than 90.
Is thei...
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1 |
1277 |
20 Apr 2007 12:05 PM |
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0 Replies and 1357 Views
area estimation using Band threshold to ROI 1357 0
Started by Deleted User
I have got problem in getting area from the ROI.
currently,I am estimating the lake area with time using band threshold to ROI tool.however the area shown under option- report area of ROI is all the same.Actually the lake shrinks & gets dry with time. how can get the area estimate with in the ROI generated
I am not sure whether I am doing wrong with the ROI( assumed maximum lake area extent) using polygon or polyline.
regards
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0 |
1357 |
19 Apr 2007 01:49 PM |
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3 Replies and 1415 Views
ENVI's automatic ASTER 1A/1B calibration Tech tip 4114. What about Level 3A1? 1415 3
Started by Deleted User
This post refers to the Tech tip ID 4114.
I have some ASTER data processed to Level 1A, 1B and the orthorectified 3A1. I want to atmospherically correct the data using FLAASH. The tech tip explains that ENVI automatically applies calibration coefficients when opening level 1A and 1B according to EDC DAAC guidelines. This is however not performed on the level 3A1 data. When opened as (HDF EOS format) the data are simply scaled to 8bit 0 - 255 and not physical radiance units. I would therefore ...
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3 |
1415 |
18 Apr 2007 09:45 AM |
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1 Replies and 1290 Views
how to download bands at a time 1290 1
Started by Deleted User
Currently ,I am downloading huge landsat image data with bands 1, 2, 3 and soon separately.
I appreciate if there is any means to download the bands together at a time. Or at least 2 or three bands at a time.
Any idea is most welcoming
regards
Yohannes
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1 |
1290 |
18 Apr 2007 12:53 AM |
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2 Replies and 1154 Views
FLAASH error, similar to Jessica Mitchell post ID 2367 1154 2
Started by Deleted User
Hi all,
As the subject states I have the same problem as post ID 2367. I am using ASTER EOS HDF data (Processed to level 3A1). I have layer stacked the VNIR and SWIR and converted to BIL format. Wavelengths are present in the data set and all seems well. After entering all the required info I run the code and get the above mentioned error. Below is output from the journal file and template.
I am using ENVI 4.3 in windowsXP on a DELL OPTIPLEX GX620
Any help would be greatly appreciated
K...
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2 |
1154 |
17 Apr 2007 01:42 AM |
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0 Replies and 3763 Views
FLAASH error, similar to Jessica Mitchell post ID 2367 3763 0
Started by Deleted User
Hi all,
As the subject states I have the same problem as post ID 2367. I am using ASTER EOS HDF data (Processed to level 3A1). I have layer stacked the VNIR and SWIR and converted to BIL format. Wavelengths are present in the data set and all seems well. After entering all the required info I run the code and get the above mentioned error. Below is output from the journal file and template.
I am using ENVI 4.3 in windowsXP on a DELL OPTIPLEX GX620
Any help would be greatly appreciated
K...
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0 |
3763 |
17 Apr 2007 01:42 AM |
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1 Replies and 1372 Views
Scaling reflectance values? 1372 1
Started by Deleted User
This isn't really an ENVI specific issue but nonetheless somebody might be able to help me as I am having real problems getting my head around this problem. As I want to compare image spectra with library spectra I need to atmospherically correct ASTER data; I have used a variety of ENVI tools to do this (flat field, log residuals) and also got AST_07 surface reflectances. As these surface reflectances have a variety of value ranges (both from dataset to dataset and for each band of the datasets...
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1 |
1372 |
12 Apr 2007 08:56 AM |
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0 Replies and 1309 Views
run module 1309 0
Started by Deleted User
Somebody, help me. What shoud I do with SPC_IO.zip.
This archive contains READ_SPC.PRO, and WRITE_SPC.PRO to read and write spectral data in the open GRAMS SPC format (now owned by Thermo Scientific). The file format specification is also included.
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0 |
1309 |
09 Apr 2007 10:54 AM |