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1 Replies and 1113 Views
ISODATA FAIL 1113 1
Started by Deleted User
Hello,
I have been trying to run unsupervised classifications with the tool in ENVI 5.0 (I hope to get 5.1 soon). I ask that the tool return 20-25 classes, but no matter what my other parameters are, the output is always just ONE class. One big horrible red screen. HELP! This has happened more often than not and when I finally get it to work, I have no idea why it worked. Why would the tool return only one class What are some reasons I have tried to read up about ISODATA but it is too ...
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1 |
1113 |
13 Jan 2014 11:30 AM |
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1 Replies and 1256 Views
Mosaic tool 1256 1
Started by Deleted User
Hi,
I got involving license of ENVI 5.1. I'm testing it now. I'm have big interest about mosaic tool, specially, color correction option. I'm working with hyperspectral data (CASI images), so my main issue intensity normalization between the lines.
I tried mosaic two lines. Each line is aprox 15GB, 48 band image. The mosaic tool worked aprox 1h and then stopped. Finally, no result. Only output file name without information. No header for the file also. I made 3band subset for both lines, then pe...
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1 |
1256 |
13 Jan 2014 06:19 AM |
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1 Replies and 1376 Views
Sun Zenith angle, radiance in MODIS 1376 1
Started by Deleted User
Can anyone tell me how to read Sun angle, Zenith angle in MODIS satellite data.
Mary
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1 |
1376 |
12 Jan 2014 11:56 PM |
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3 Replies and 1157 Views
2-D Scatterplots - No valid pixels 1157 3
Started by Deleted User
Hello,
I am having trouble creating a 2-D scatterplot of 2 bands of vegetation fractions (the result of linear spectral unmixing). I keep getting an error that says, "Cannot create scatter plot without valid pixels in the display". The only thing I can think of is that the data are in floating point format. Does this affect ENVI's ability to create a scatter plot If so, how do I convert floating point data to integers without losing information
Thanks
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3 |
1157 |
11 Jan 2014 12:08 PM |
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2 Replies and 1863 Views
Geoeye-1 radiance gains/offsets not in metadata file 1863 2
Started by Deleted User
I've been searching for the band-specific radiance gains/offsets for GeoEye-1 imagery. The metadata file that came with my imagery has information such as sun azimuth, but I don't see anything that appears to be radiance gains. I have read this document (http://www.apollomapping.com/wp-content/user_uploads/2011/09/GeoEye1_Radiance_at_Aperture.pdf) in hopes to convert what I believe to be digital numbers to exoatmospheric reflectance. My imagery is "Geo" level processed, so I underst...
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2 |
1863 |
07 Jan 2014 03:31 PM |
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1 Replies and 1065 Views
Flaash 1065 1
Started by Deleted User
Hello,
I'm using flaash tool for my hyperspectral data (CASI image with 48 bands, spectral range from 380-1050 nm). I setted up all according to manual. Overall result is ok, only all watter bodies and some shadow places have 0 reflectance in whole spectral range. I expect such result in infrared region but not in the visible portion. Should it be like this or i missed some setting or doing something wrong
I went through setting steps several times. Try to change atmosphere models (for my dat...
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1 |
1065 |
07 Jan 2014 06:12 AM |
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1 Replies and 1413 Views
Feature Extraction and attribute scatter plot graph 1413 1
Started by Deleted User
Hello,
I am performing Example-based Feature Extraction on a RapidEye image, using the following settings:
Segment scale level - 50
Merge level - 80
3 classes - Forest (44 training regions); Non-forest (126 training regions); Water (25 training regions)
kNN classification with one neighbor, threshold 5
In the process of setting these parameters, I would like to be able to visualize 2d scatter plots of the attribute values for the training regions, in order to better understand the relat...
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1 |
1413 |
31 Dec 2013 12:24 PM |
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1 Replies and 1279 Views
Several TIF Files convert into one TIF File 1279 1
Started by Deleted User
Hi guys,
I'm using ENVI 4.7 and I got some data from USGS which includes a scene of Potsdam, Brandenburg, Germany. In the archive are 8 TIF Files, I guess there are just define the different bands (8 bands). I know that is possible to load the TIF Files seperate into ENVI and then choose with RGB selector which band do I wanna show. My question is now, how can I convert these TIF Files into one File including all the bands, so that I just can keep one using one TIF File. Because I need to make a...
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1 |
1279 |
28 Dec 2013 07:01 AM |
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5 Replies and 1714 Views
Sum Data Bands 1714 5
Started by Deleted User
I am using MODIS data in ENVI classic and have 6 images for different months which I need to combine to get an image for my whole timescale. How do I go about summing the bands as in the input and output parameter options there does not appear to be a way of selecting multiple bands.
Regards
Green
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5 |
1714 |
20 Dec 2013 09:29 AM |
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1 Replies and 1173 Views
Inserting image file into word document 1173 1
Started by Deleted User
Hi Dears: Would anyone kindly help me out in which format should I save my processed image (e.g. quick map) file so that I can open it in word document OR any tip to insert the image file from the display window into a word document.
Thanks
Arshad
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1 |
1173 |
18 Dec 2013 12:10 AM |
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4 Replies and 1396 Views
Confusion Matrix and Accuracy Assessment 1396 4
Started by Deleted User
I am classifying a CORONA image which dates back to 1965 using example based feature extraction using attributes of spectral, textural and a couple of spatial attributes. I wish to do accuracy assessment of the classification but do not have a Ground Truth Image. The only resource I have is the CORONA image itself and I can identify a few features easily by my photo-interpreation techniques. Can you suggest any method how to proceed from here
Also I cannot find the "Confusion Matrix Usi...
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4 |
1396 |
18 Dec 2013 12:08 AM |
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4 Replies and 4684 Views
download envi 5.1! 4684 4
Started by Deleted User
How could i download envi 5.1 from the exelis website
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4 |
4684 |
16 Dec 2013 11:33 PM |
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1 Replies and 1290 Views
FLAASH for WV-2 data 1290 1
Started by Deleted User
Hi all, I'm having difficulties getting meaningful outputs from FLAASH for WorldView2 data. I have performed radiometric correction using the gain & offset values from the image header file and radiometric calibration to radiance (getting an output file with values in the order of 0.00X). When I run this image through FLAASH, specifying tropical atmospheric model and rural aerosol model, selecting NO for water and aerosol retrieval, I get an output image with negative values of several hundred w...
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1290 |
13 Dec 2013 06:13 AM |
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1 Replies and 1183 Views
L2 ocean color convert reflectance value 1183 1
Started by Deleted User
I'm trying to calculate the correct values for reflectance at band 443. Most of the values I have for the L2 Rrs443 band are approx. -20,000. I was trying to input the following equation using slope and intercept to convert this number into the correct value. The formula I am using is:
short Rrs_443(Number of Scan Lines, Pixels per Scan Line) ;
Rrs_443:long_name = "Remote sensing reflectance at 443 nm" ;
Rrs_443:slope = 2.e-06f ;
Rrs_4...
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1 |
1183 |
11 Dec 2013 03:15 AM |
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1 Replies and 1334 Views
2D scatter plot 1334 1
Started by Deleted User
ENVI gives 2D scatter plot between two bands. But it is only available graphically. How do I save the data which is used in drawing the plot so that I can compute its slope/fitting error etc using some other spreadsheet program
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1 |
1334 |
10 Dec 2013 10:29 PM |
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1 Replies and 1609 Views
problems with FlAASH 1609 1
Started by Deleted User
Hi
I am using ENVI 5.0 SP3. The data I was processing is from HJ-1A satellite, which was launched by China. When I tried to make atmospheric correction using FLAASH, it did not work. The following is the error message.
Problem: The FLAASH program exited with the following errors:
ACC error: avrd
IDL error:
POINT_LUN: Negative position argument not allowed. Position: -1994441936. Unit: 102, File: E:\HJData\HJ1A-CCD1-450-64_BIL.
ACC_AVRD
ACC_HYPER2
ACC_ACC
ENVI_ACC_EVENT
EN...
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1 |
1609 |
10 Dec 2013 07:38 AM |
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2 Replies and 1507 Views
Strange values converting Landsat Band 6 to LST 1507 2
Started by Deleted User
Hi--
I'm trying to convert Landsat data into land surface temperatures (I have ENVI 4.5) --having trouble opening from the .met files but I'm using the Band 6 Geotiff which looks fine. However, when I run the Landsat Tm calibration utility, I'm getting values like 0.22. Since I believe the values are supposed to be in degrees Kelvin, I know I'm doing something wrong but can't figure out what There aren't too many parameters to set--the date/solar elevation angle are correct, and I've taken t...
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2 |
1507 |
09 Dec 2013 05:00 AM |
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1 Replies and 1309 Views
FLAASH USING AISA 1309 1
Started by Deleted User
Hello,
I have a hyperspectral image taken with AISA sensor, part of the images are in water (ocean) in a tropical environment. AISA wavelength range is 400-970nm. I'm using the basic parameter to process the image but with not good results, many spectral values are negative even in land (see attach file for the template file). What are the best parameters for FLAASH using AISA images What other parameter could I change to get better results
Best Regards,
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1 |
1309 |
06 Dec 2013 08:42 AM |
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1 Replies and 1157 Views
How to do a good mask 1157 1
Started by Deleted User
Hi,
I work with ENVI 4.7.
I need to mask an image in order to work only on shallow waters.
For now, I only digitized an ROI from the coastline to all the land...It is long and it's not possible to do this for many images...
So I want to find a technique based on pixel value. I know that I could choose "import range" in building mask, but could you please give me some advice to chose thoses ranges
Thank you
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1 |
1157 |
05 Dec 2013 01:50 PM |
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1 Replies and 1298 Views
SEGMENTATION IMAGE 1298 1
Started by Deleted User
Hello
I am working on Landsat8 OLI with ENVI 4.8. I want to do image segmentation using Basic Tools menu but when segmentation image dialog appears it asks me for "Min thresh value" and "Max thresh value" and also "number of neighbors". Now my question is how can I determine these values
I would be appreciate if some one can help me.
Thanks
Nadia
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1 |
1298 |
05 Dec 2013 08:13 AM |