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2 Replies and 1350 Views
Question about FLAASH workflow w/ASTER L1B data 1350 2
Started by Deleted User
Hi forum--
I'm working with multitemporal ASTER data to evaluate land-use change over about 10 years (I have around 10 images). I'm using a spatial subset of a region common to all 10 images--and using these subset images as my base BIL images for FLAASH. My question: is the central coordinate still the one for the full granule, or should I use the center of the subset image I assume it's the first one--just want to make sure (I'm an archaeologist and not a remote sensing specialist!) I sup...
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1350 |
09 Oct 2013 04:05 PM |
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1 Replies and 1489 Views
An issue about Spectral Resampling 1489 1
Started by Deleted User
Hello,
i was trying to convolve a spectra extracted from ASTER jhu spectral library to TM band response. I heard that by using ENVI Spectral Resampling Function and tm.sli. "Landsat TM filter function" they say that it is easy. Also i heard that ENVI includes the ASTER spectral library too. But when i checked the ENVI 4.7 i saw that there are band 1,2,3,4,5,7 in tm.sli file. but i will try to convolve emissivity of manmade spectras to TM 6 band response. not the reflective spectras to ...
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1 |
1489 |
07 Oct 2013 02:19 AM |
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1 Replies and 1202 Views
when Windows 8/8.1 to be supported? 1202 1
Started by Deleted User
Team,
Any plan to release new ENVI for Win 8/8.1
The company is planning to move all workstations for that new platform.
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1 |
1202 |
03 Oct 2013 01:39 AM |
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3 Replies and 1242 Views
Agriculturas stress 1242 3
Started by Deleted User
Hello friends wanted nsultarles good days following....
is possible to calculate Agriculturas stress using 4 bands RGBI .
regards
Franklin
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3 |
1242 |
30 Sep 2013 10:56 AM |
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3 Replies and 1526 Views
issue regarding landsat8 atmospheric corrctions 1526 3
Started by Deleted User
Dear Moderator!! Last night, i was working on radiance calibration of landsat8 OLI to run the FLASH module. But in new interface of envi 5.0. sp3 (32 bit), the radiance calibration module converted landsat8 image into flash format (BIL) of radiance with scale factor (SF) of 0.1. I put this file into Flash and choose the same scale factor of 0.1 but earlier with landsat 5 and 7, we put the SF value of 10. which SF one can use for landsat8 I used lfilter function ldcm_oli.sli located in the ...
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3 |
1526 |
30 Sep 2013 06:55 AM |
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1 Replies and 1968 Views
Create Buffer Zone in ENVI 5 1968 1
Started by Deleted User
Hi,
I am looking for the Create Buffer Zone from ROIs tool that was in previous versions of ENVI. I cannot find it in ENVI 5 and only see buffer zone from classification image. Does anyone know of this tool and where it is located in the new version
Thanks!
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1 |
1968 |
26 Sep 2013 03:29 PM |
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2 Replies and 1624 Views
ENVI_CONVERT_FILE_MAP_PROJECTION problem 1624 2
Started by Deleted User
Hi everyone,
I am having some issue when I call the function ENVI_CONVERT_FILE_MAP_PROJECTION in my code.
Basically I am trying to convert a MODIS ET product from sinusoidal to a UTM projection.
ENVI_OPEN_FILE, filename(i), r_fid=fid
ENVI_FILE_QUERY, fid, dims=dims
map_info = envi_get_map_info(fid=fid)
;define the output projection
o_pixel_size = &911000.0, 1000.0&93
datum='WGS-84'
units = ENVI_TRANSLATE_PROJECTION_UNITS('m')
o_pro...
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1624 |
25 Sep 2013 05:21 AM |
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1 Replies and 1170 Views
issue with opening ASCII files (v4.8) 1170 1
Started by Deleted User
Hi All,
I am having an interesting issue when loading ascii files via the Open External File ->Generic Formats -> ASCII
The result from loading a single band floating point file will have an incorrect delimeter, meaning the pixel values are not correct.
My input file is basically a re-processed ascii file that was exported from envi (processed by loading into ArcGIS and then exported as ascii)
So my originally exported file has the format as follows:
ncols 1354
nrows 2030
...
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1 |
1170 |
19 Sep 2013 08:07 AM |
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1 Replies and 1762 Views
Landsat gap fill 1762 1
Started by Deleted User
I am in search of method to fill in SLC-off gaps in Landsat ETM data.
I have read previous posts but it is still not clear whether or not this is currently possible using ENVI.
I have seen mention of a method using ENVI called "single file gap fill triangulation" but I am unable to find the tool to complete this. I am new to ENVI and have access to ENVI v5.0. Is this tool/method available in v5.0 and are there any resources or documentation for this method
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1762 |
16 Sep 2013 02:40 PM |
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2 Replies and 1068 Views
QUAC output units 1068 2
Started by Deleted User
When applying the QUAC utility to a Landsat image with pixel values in DN (0-255), what are the output pixel value units I have input range of 0-255 for band 1 and output QUAC values of 0-7000, for example.
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1068 |
16 Sep 2013 06:41 AM |
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2 Replies and 1494 Views
Applying same stretch (histogram) to several images 1494 2
Started by Deleted User
Hello all,
I am trying to create a time-series visualization which shows the progression of a wildfire over the course of ~2 weeks. I started with 3 MODIS single-band rasters (bands 1, 2 and 7) for each day and produced a 7-2-1 composite for each day. I am now trying to display these composites as a comic strip or animation so the growth of the burn scar as the fire progressed can be visualized.
My issue is getting these images to have a consistent stretch so that they can be compared accurately...
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1494 |
11 Sep 2013 09:10 AM |
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1 Replies and 1725 Views
Problems with nodata-values in floating point raster 1725 1
Started by Deleted User
Hello,
I have a problem with a raster in ENVI.
To explain the problem, let's assume I have 2 raster (same extent and cell size, TIFF, integer, 8 bit, nodata-values 255). With those raster, I can work perfectly well in ENVI.
Then I perform some raster math in ArcGIS:
raster3 = float(raster1) / float(raster2) &91pseudocode&93
The resulting raster3 is floating point, 32 bit, nodata-values -3.40282346639e038, and everything is displayed perfectly well in ArcGIS. However, when ...
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1725 |
10 Sep 2013 04:45 AM |
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11 Replies and 2316 Views
Landsat 8 2316 11
Started by Deleted User
Hi
I start to work with Landsat 8 images and I have several doubts. As I have to work with a high number of images I would like to know if it is possible to open all the visible bands as an unique image in a automatic way. At this moment I am opening the tiff bands in ENVI and then I am stacking the bands. Another doubt is if it is planned to add a specific atmospheric correction for Landsat 8. Thank you in advance
Best regards
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11 |
2316 |
10 Sep 2013 01:08 AM |
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1 Replies and 1380 Views
SPOT4/SPOT5 DN to Radiance 1380 1
Started by Deleted User
I have SPOT4 and SPOT5 imagery that I need to atmospherically correct. The images come in digital numbers. How can I go from DN to radiance values to import into FLAASH or QUAC
I tried dividing the DN by the absolute calibration gain value, but it did not work. Any models out there for getting SPOT radiance from DN
Also, if using FLAASH, what is the correct radiance scale factor(s)
Thank you for any help!
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1 |
1380 |
06 Sep 2013 12:57 PM |
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1 Replies and 1735 Views
PCA error 1735 1
Started by Deleted User
Hello,
I am trying to run Forward Principal Components Rotation (computing new statistics) on a 16-band file comprised of atmospherically corrected Landsat 8 bands and calculated EVI. Every time I try to run the PCA it freezes at around 99 - the computing statistics phase. The first few times I encountered the problem, I couldn't shut the software down. This last time I got an error message. "An error was caught in the main event handler. Error: LA_EIGENPROBLEM: Routine did not conver...
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1735 |
05 Sep 2013 03:05 PM |
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1 Replies and 1722 Views
Background values and histogram matching 1722 1
Started by Deleted User
Dear support team:
As Landsat images are not rectangular, we have always some blank areas with background values around images, does the values in those regions take into consideration for histogram matching of two image If I wanna mosaic two images, is it needed to clip those areas for better matching of histograms I wonder if it is necessary to cut the irregular edges and eliminate background values around the image to have better matching of histograms for mosaicking.
Cheers
Abbas
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1 |
1722 |
02 Sep 2013 09:42 AM |
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1 Replies and 2438 Views
Saving images after histogram matching ENVI 2438 1
Started by Deleted User
Hi friends
I am new in ENVI, trying to mosaic two Landsat images to derive NDWI. After calculating reflectance of different bands I need to match the histograms of two adjacent images taken in the same day, but when I want to save the image that has been matched with another one, the pixel values of new saved image get an integer between 0-255. Let me know please how I can save the image with the pixel values in the same range as before (like float or double format) instead of 0-255. It is very ...
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1 |
2438 |
02 Sep 2013 08:45 AM |
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1 Replies and 1265 Views
Crosshairs in multiple windows 1265 1
Started by Deleted User
We just installed SP3. Is there still no way to display and link crosshairs in multiple windows
Thanks
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1 |
1265 |
30 Aug 2013 11:27 AM |
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1 Replies and 1418 Views
Initial Visibility setting in FLAASH 1418 1
Started by Deleted User
In an ENVI training course we were advised to check initial visibility on the image acquisition date from the nearest airport or weather station. The problem is that often (especially at airports) horizontal visibility is only recorded up to 10-km or simply as "10-km and above." To an airport, this is "clear," but ENVI help documentation (http://www.exelisvis.com/portals/0/pd... p.24) suggests values of 40 to 100-km as 'Clear,' 20 to 30-km as 'Moderate Haze,' and values of...
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1418 |
28 Aug 2013 12:52 PM |
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2 Replies and 1079 Views
Agricultural stress 1079 2
Started by Deleted User
Good afternoon, I have 4 band (RGBI) and I can only get two vegetation indices (Normalized difference vegetation index and Simple Ratio Index), when I want to calculate crop stres I get a message "Requiered indices for vegetation mapping not present".
With 4 band RGBI not possible for calculation "Agricultural stress"
We need to generate more vegetation indices for calculation "Agricultural stress", I'm good time trying and I can not.
I need to have more bands...
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2 |
1079 |
27 Aug 2013 04:48 PM |