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4 Replies and 1302 Views
Cloud Removal from satellite images 1302 4
Started by Deleted User
Hi All,
Can anyone here help me with a detailed descriptive method of removing clouds from satellite images using envi. Thanks
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4 |
1302 |
05 Apr 2012 12:34 AM |
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6 Replies and 2064 Views
scatter plot of whole image - R^2 calculation? 2064 6
Started by Deleted User
Hi,
help is needed. Keywords: Scatter plot, R^2 and NDVI
An example to understand the problem: I have a Band 3 SLC-on and for the same scene 2 different gap-filled files (done by different methods)
i want to compare SLC-on with gapfill1 and SLC-on with gapfill2
I want to make a scatter plot to compare them (see which gap-fill procedure is best). When i do so in ENVI, i only get the scatter plot of a small region - how can i get the scatter plot of the whole ima...
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6 |
2064 |
02 Apr 2012 06:50 PM |
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2 |
1683 |
02 Apr 2012 12:08 PM |
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0 Replies and 1134 Views
ENVI_DOIT Match Filter Dialog 1134 0
Started by Deleted User
I have seen various questions regarding this but no consistent answer - I have a series of procedures which run MF's on a large series of files. These procedures are called by an overarching procedure that manages which files get processed using various Match Filter configurations. Is there a consistent way to either (a) prevent the Singular Value Matrix dialog/info_widget or (b) programmatically close it
Note - do not reply to the email in my alias, that was a previous company I worked ...
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0 |
1134 |
29 Mar 2012 03:13 PM |
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1 Replies and 1046 Views
Extracting shared subset of two images? 1046 1
Started by Deleted User
ENVIers: I'm wondering if there is an easy way that, given two images in the same projection/datum and pixel sizes, how to extract a subset from each image corresponding to the overlap zone such that the two extracted regions have the same lines and samples Thanks!
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1 |
1046 |
29 Mar 2012 10:19 AM |
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0 Replies and 1216 Views
Atmospheric correction of Hyperion data 1216 0
Started by Deleted User
I have used Hyperion tools to convert L1R hyperion file. I used the scale factor file created in this process, unedited at the beginning of the Flaash conversion dialogue. I assume this is ok. I assume the header file mentioned in the hyperion tools guide is the header file created in the conversion process. Which are the bad bands in this text file Are they the ones right at the bottom identified as bbl consisting of 0s & 1s why does this header file need the band values replaced after ...
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0 |
1216 |
26 Mar 2012 11:41 PM |
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3 Replies and 1157 Views
Atmospheric correction of Hyperion data 1157 3
Started by Deleted User
Hi
I have used the hyperion tools to convert L1R file. I ticked the flaash scale text file option. The user guide for the tool asks the header file to be edited prior to Flaash conversion. Is this the header file which has data under the string bbl shown below
ENVI
description = {
ENVI File, Created &91Mon Mar 19 18:01:29 2012&93}
samples = 256
lines = 7030
bands = 242
header offset = 0
file type = ENVI Standard
data type = 2
interleave = bil
s...
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3 |
1157 |
26 Mar 2012 08:31 PM |
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1 Replies and 1031 Views
FLAASH input data 1031 1
Started by Deleted User
Hi,
I would ask you some suggestions about FLAASH module. I'm trying to make atmospheric correction on Landsat images; I know I'm making some mistake, because the FLAASH corrected image has about 60 negative pixels. I think the problem is in the visibility value: I put 10 km (according to meteo data archive), but in the ENVI Help I find that values less than 15 km mean a thick haze weather condition.
So the question is: for FLAASH, visibility is related ti weather conditions or to the ef...
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1 |
1031 |
26 Mar 2012 03:20 PM |
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1 Replies and 1165 Views
MISR data 1165 1
Started by Deleted User
Hi All;
I am trying to read MISR Aerosol product in ENVI, how can i do that Any help will be appreciated.
Yasir
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1 |
1165 |
26 Mar 2012 07:15 AM |
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4 Replies and 2489 Views
Zenith-Azimuth Angle Calculation for off nadir Instrument 2489 4
Started by Deleted User
Hi,
I need to calculate Zenith and Azimuth Angles for FLAASH input, from following information available:
Sun Azimuth
139.908233
Sun Elevation
41.539439
Satellite Inclination
98.19
Look Angle
-2.2875
This is Hyperion data of year 2010..Does anyone know how to get the correct ...
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4 |
2489 |
25 Mar 2012 02:25 AM |
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7 Replies and 1513 Views
Pleiades sensor support 1513 7
Started by Deleted User
Dear colleguas.
Any one have expirience with Pleiades images I don't have any idea how i need open with data and make ortho. I use primary level image from ASTRIUM site. I will be grateful for any assistance.
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7 |
1513 |
23 Mar 2012 03:55 AM |
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8 Replies and 1357 Views
Strange in NDVI value after FLAASH processing 1357 8
Started by Deleted User
Dear All,
After I processed Landsat 5TM in FLAASH then calculate NDVI. The value of some pixel is out of the range (0 to 1). The range is between -611 to 799.
Could you give me some advises.
Thank you.
Best Regards,
Paula.
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8 |
1357 |
22 Mar 2012 08:37 PM |
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4 Replies and 1286 Views
Projection, QUAC 1286 4
Started by Deleted User
Hi,
I am beginner with ENVI. I work with SPOT level 1b (format tiff), projection UTM 33N, datum WGS-84.
When I load it to Envi, the image seems like it has no projection (has the shape of a rectangle, but it should be a parallelogram).
When I load it to ArcMap, picture has projection (WGS 84, UTM 33N). But if I something change in ENVI (format or calculate some index) and then I save the picture as tiff/geotiff, than the picture lose projection (in ArcMap). I want open this file in ArcM...
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4 |
1286 |
21 Mar 2012 02:18 PM |
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1 Replies and 2580 Views
FLAASH module and wavelengths and FWHM values 2580 1
Started by Deleted User
Hi, I need your help concerning FLAASH module utilisation.
I am trying to use the FLAASH module (ENVI 4.5, on windows) to make atmospheric correction on LANDSAT 5 TM image.
I download this image from GLOVIS website, my image has a Level 1T and a geotiff format.
When I input Radiance image, ENVI software prompt "Enter ASCII file name containing wavelengths and FWHM".
I read ENVI help and I understand why this window appear but I don't know how to get the wavelengths and F...
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1 |
2580 |
20 Mar 2012 10:37 PM |
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0 Replies and 1360 Views
No Available regions to use 1360 0
Started by Deleted User
Hi,
I was working on resizing data and everything was going fine.
I opened a vector(used for the ROI) and was using to to resize TIFF files. Then all of a sudden, when trying to change the spatial subset using an ROI I get an error saying "there are no available Regions to use".
I have no idea what is going on, I didn't change the process in any way.
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1360 |
19 Mar 2012 02:14 PM |
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1 Replies and 1221 Views
convert a GeoTIFF file to an ENVI file programmatically? 1221 1
Started by Deleted User
Hello, is there a way, does anyone know, to programatically (from w/in an IDL script) convert a GeoTIFF file to an ENVI file I am not finding a routine to do so in the reference guide - unless I missed it (I am using ENVI 4.5).
thank you!
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1 |
1221 |
16 Mar 2012 03:54 PM |
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2 Replies and 1018 Views
FLAASH sensor azimuth angle 1018 2
Started by Deleted User
As defined in the manual:
"The azimuth angle is defined as the azimuth (the angle between the line of
sight and due North) of the sensor as viewed from the ground. This angle is arbitrary for
nadir-viewing sensors. Azimuth values must be between -180 and 180 degrees. For example,
if your azimuth from the sensor is 90 degrees (due east), then the azimuth from the ground is
-90 degrees (due west)."
My case:
http://imgur.com/BmOGE
Sensor passes scen...
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2 |
1018 |
15 Mar 2012 07:43 AM |
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3 Replies and 1019 Views
Histogram issue with larger datasets? 1019 3
Started by Deleted User
When I use Compute Statistics under Basic Tools > Statistics and check the histogram option, the histogram of a relatively small file comes out fine, whereas the histogram of another, larger file does not seem right. It looks very regular, and every 7th bin or so has 0 in it, which looks odd and can certainly not be explained by the data. My question is: does ENVI has a known issue with computing histograms for larger datasets This one has 643,467 points.
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3 |
1019 |
14 Mar 2012 05:54 PM |
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1 Replies and 1162 Views
Problem with Frame_and_fill win32 program 1162 1
Started by Deleted User
Hello,
I need your help with the program Frame_and_fill win32. I have been able to re-frame without any problem, but when I go to gap filling, I get this error:
"The following error was encountered: OPENW: Error opening file. Unit: 100, File: E:\GAP FILLING\gapfill_output.txt".
Where can I get gapfill_output.txt file I´m working with ENVI 4.2.
Thank you for your help
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1 |
1162 |
13 Mar 2012 03:47 PM |
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2 Replies and 966 Views
map projection troubles with converting LAS file 966 2
Started by Deleted User
I have a LAS LiDAR file with the following header information:
FILE_SIG LASF
RESERVED 0
VERSION_MAJOR 1
VERSION_MINOR 1
SYSTEM_IDENTIFIER
GENERATING_SOFTWARE Global Mapper
FLIGHT_DATE 1
YEAR 2012
HEADER_SIZE 227
OFFSET_TO_DATA 439
NUM_VAR_RECORDS 2
POINT_DATA_FORMAT 0
POINT_DATA_RECORD_LEN 20
NUM_POINT_RECORDS ...
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2 |
966 |
13 Mar 2012 11:55 AM |