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4 Replies and 2374 Views
FLAASH error 2374 4
Started by Deleted User
I tried to do atmospheric correction for Rapid Eye image and got error message:
ACC error...
IDL error: -351
End of input record encountered on file unit: 0.
in context: convert7
calls:
ACC_CONVERT7 ACC_HYPER2 ACC_ACC ENVI_ACC_EVENT ENVI_FLAASH_PROCESS_MANAGER
$MAIN$
I can't find any information about IDL error: -351. Does anybody know what does it mean
Many thanks.
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4 |
2374 |
22 Sep 2015 07:28 AM |
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3 Replies and 1771 Views
Wildly different reflectance values for TM - with and without QUAC 1771 3
Started by Deleted User
Hello,
I wanted to share a screen snapshot of this. I have my original TM image as downloaded from glovis.usgs.gov as the bottom image. The values 22, 23, 55 are in DN 0-255.
The middle image is the TM image calculated to reflectance values without having been corrected using the QUAC tool. I just took the DN image and used the radiometric calibration. I understand these values are in proportion 0-1 reflected.
The top image is where I applied the QUAC tool to the image (using the settings for ...
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3 |
1771 |
17 Sep 2015 05:20 AM |
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5 Replies and 1780 Views
Reading VIIRS in batch mode 1780 5
Started by Deleted User
Hello,
I would like to read VIIRS images (From the NOAA CLASS archive) using ENVI in batch mode. The idea is to load the image, perform bow-tie correction and then output a georeferenced TIFF file for later use. Effectively just the same procedure as File->Load with a VIIRS H5 file in the GUI program.
But I can't figure out how to do this in batch mode. IF I try:
COMPILE_OPT IDL2
e = ENVI(/HEADLESS)
VImg = e.OpenRaster(infile&93)
Then I get an error: " Dataset name must be provide...
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5 |
1780 |
16 Sep 2015 02:02 PM |
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3 Replies and 1637 Views
QUAC - output values for TM? 1637 3
Started by Deleted User
Hello,
I used the QUAC module on a Landsat TM image and just was curious what the output values are. The original data was in DNs from 0-255 for each band. The output has a huge range, different for each band. The range is from 0-50,741 for band 3, for example.
Thank you!
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3 |
1637 |
15 Sep 2015 12:33 PM |
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0 Replies and 2232 Views
Sentinel-2a jpeg2000 georeference tags 2232 0
Started by Deleted User
I am working with the sample S2a MSI products available from the ESA Data Hub. They are in jpeg2000 format. When I open them using the xml file in ENVI 5.3, the georeference tags come through, so that I can tell where I am in the image:
Geo: 26°21'44.89"N,29°51'28.05"E
Map: 1385878.0078,2946393.8984
MGRS: 35RQK8519018986
Proj: UTM, Zone 34 N, WGS-84
When I open the image in ENVI Classic, the images have no map info. When I use any of my software which call ENVI modules...
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0 |
2232 |
15 Sep 2015 09:15 AM |
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2 Replies and 1631 Views
Landsat Reflectance Values 1631 2
Started by Deleted User
Hi there,
I have performed Landsat radiometric calibration to reflectance using the radiometric calibration tool in ENVI. I'm just a bit confused about the output.
As far as I understand it, the values are TOA reflectance ranging from 0-1 (0 to 100). According to the literature I've read, sand should have a high reflectance in most bands and also ought to be some of the brightest pixels in my scene, since they appear almost white. Why is it that my beaches have values of around 0.25 to ...
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2 |
1631 |
14 Sep 2015 05:05 AM |
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1 Replies and 1600 Views
atmospheric correction for airborne hyperspectral data 1600 1
Started by Deleted User
Hi,
I am a MS student in Geology at Bowling Green State University. I am trying to do atmospheric correction for airborne hyperspectral images using ENVI 5.2. I tried ENVI FLAASH and got a 'good looking' image. But when I checked the spectral profile, the data values are not that good. Is it possible to use flaash to process my data I tried QUick correction too. It looks lot more better than flaash and the spectral profile match with my in-situ measurements. Is this QUick correction reliable...
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1 |
1600 |
10 Sep 2015 05:16 PM |
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1 Replies and 1877 Views
band math conditional 1877 1
Started by Deleted User
I need to use the conditional statements in band math and I don&180;t know how. I have a follow-on question that I hope someone can address. My images have values from 0 to 1. I need to apply a lineal equation (B1 * 1.515 - 0.33) if the value is greater than 0.2179 and less than 0.8449. If the value is less than 0.2179, it has to take the value 0, and if the value is greater than 0.8449, it has to take the value 0.95. Any suggestions would be greatly appreciated. Thanks a lot. Pablo
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1 |
1877 |
07 Sep 2015 09:00 AM |
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1 Replies and 1342 Views
PROBLEM Masking clouds using ROI 1342 1
Started by Deleted User
Hi,
This is getting frustrating. I have a few cloud cover on my Landsat 8 image that I want to get rid of. So from the ROI Toolbox, I created a cloud ROI then saved it. Next I wanted to mask the clouds out of the image, so I went to Toolbox -> Raster Management -> Masking -> Build Mask.
In the "build mask input file" window, I chose the image with clouds as input file, then clicked OK.
In the "Mask definition" window, I clicked "options" and imported the cloud ...
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1 |
1342 |
04 Sep 2015 02:54 PM |
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1 Replies and 1813 Views
SPEAR Tools Change Detection literature 1813 1
Started by Deleted User
Hello to everyone!
Does anyone knows where I can find detailed informations on SPEAR Tools Change Detection i.e. fourth method Spectral Angle change detection, with exception EXELIS Website (http://www.exelisvis.com/docs/SPEARChangeDetection.html)
I am just wondering if it is possible to get info on Spectral Angle Change Detection method, offered in SPEAR Tools, in particular about how spectral similarities between "before" and "after" images are measured How is change-no ...
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1 |
1813 |
03 Sep 2015 12:12 AM |
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1 Replies and 1529 Views
extracting shapefiles of classification results 1529 1
Started by Deleted User
Dear Sir/Ma,
I am trying to estimate land use changes in ENVI using landsat satellite images. I have done the classification and cleanup but I am stuck with extracting my landcover data for my watersheds. As you know that satellite image scene are huge and I based my classification on the entire image scenes. However, I have shapefile of my watersheds that I want to extract from the images for post processing but this last part seems not working for me. Please how can I extract my watershed...
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1 |
1529 |
01 Sep 2015 11:29 AM |
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2 Replies and 1740 Views
Customized Map Projection: RD_New, Netherlands. How? 1740 2
Started by Deleted User
I want to add RD_New (Netherlands Projection) in ENVI using Customized Map Projection Definition. But the projection type and projection ellipsoid are not available. What should I do
The projection is defined as follows, which can be found in EnviPEProjcsStrings.txt
PROJCS&91"RD_New",GEOGCS&91"GCS_Amersfoort",DATUM&91"D_Amersfoort",
SPHEROID&91"Bessel_1841",6377397.155,299.1528128&93&93,PRIMEM&91"Greenwich",0.0&93,UNIT&91"Degree&...
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2 |
1740 |
27 Aug 2015 03:02 AM |
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1 Replies and 1549 Views
Landsat 8 Calibration 1549 1
Started by Deleted User
Hi. I am wondering if anyone can help. I have ENVI 5.1 and am using Landsat 8 data. The radiometric tool will only allow me to change the dn values to radiance, there is no option for reflectance. Also, after checking the metadata it appears that all the reflectance data are the same and therefore are not functional in band math. Is there a way for this to be solved Any help would be greatly appreciated.
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1 |
1549 |
22 Aug 2015 08:35 PM |
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4 Replies and 1653 Views
Calculating statistics based on multiple ROI&39;s 1653 4
Started by Deleted User
I have about 50 roi's that are stored within just one .roi file, and I would like to gather statistics within each one of the roi's but I can't figure out how to do this in ENVI (I am using 5.1). When I use basic tools>compute statistics I can subset stats with an roi, but when I highlight all 50 of mine it computes stats across all 50 roi's like they are one, when really I want stats for all 50 of them individually. I could select all 50 individually but I want to avoid doing this (maybe I nee...
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4 |
1653 |
21 Aug 2015 10:51 AM |
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0 Replies and 2000 Views
FLAASH error and crash 2000 0
Started by Deleted User
I am using ENVI 5.1 on Windows 7, 64 bit. The FLAASH atmospheric correction module on my computer is generating an error that causes IDL to freeze and crash. I want to correct 2014 RapidEye data purchased from their vendor. When I go to apply FLAASH corrections, the Spectral Library Viewer comes up, loading rapideye.sli. This freezes and causes the crash. The error is Intel(R) Visual Fortran run-time error. "forrtl: severe (9): permission to access file denied, until 99, file 'C:\Users\.......
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0 |
2000 |
19 Aug 2015 01:53 PM |
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6 Replies and 2180 Views
How to extract ROI 2180 6
Started by Deleted User
How can I extract my ROI I have a NDVI image and want to select all regions with NDVI value smaller than -0.00811. What should I do then Any suggestions I am new to ENVI. Thank you so much in advance!
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6 |
2180 |
19 Aug 2015 08:59 AM |
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1 Replies and 1718 Views
HDF GLS file 1718 1
Started by Deleted User
How to open HDF GLS data in ENVI
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1 |
1718 |
17 Aug 2015 06:06 AM |
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2 Replies and 1404 Views
image skewness 1404 2
Started by Deleted User
It's not clear to my why/when an image will display perfectly horizontal/vertical in the window and when it will be angled/skewed. I had thought this was related to the coordinate reference system but I'm not sure anymore. I had gone through the image georeferencing and registration tutorial and they suggested it was related to orbit direction.
In general, I would like to preserve the original display style (i.e no skewing) when opening the image and after performing image processing. Is ther...
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2 |
1404 |
14 Aug 2015 04:11 PM |
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0 Replies and 1839 Views
Hyperion data set 1839 0
Started by Deleted User
vegetation spectral signature value is wrong in hill dark area of Hyperion data set. please any solution tell me spectral signature value is right.
Thank you
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0 |
1839 |
14 Aug 2015 01:11 AM |
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1 Replies and 1316 Views
hyperion 1316 1
Started by Deleted User
How to extract dark feature in hill area of Hyperion data set.
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1 |
1316 |
12 Aug 2015 12:37 PM |