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4 Replies and 1325 Views
ENVI Classic question 1325 4
Started by Deleted User
I have recently started working with ENVI Classic as part of my undergrad research project. I work with Landsat 5 TM data and my goal is to use thermal band 6 (NYC location), convert raw data to actually temperature in K (which I have done already), and then perform unsupervised classification (done as well). My question is, once I perform K-means classification for example and get 3 classes (urban, water, vegetation) I cannot find the mean temperature for each class as my data disappears once t...
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1325 |
26 May 2015 11:53 AM |
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1 Replies and 1844 Views
PS Geocoding 1844 1
Started by Deleted User
Hello everyone,
I am performing PS Interferometry analysis on a stack of Cosmo-Skymmed Images.
When reaching the Geocoding step, the PS Map (.shp and .kml files) is properly generated providing the information I'm interested in. However, I have checked the Make Geocoded Raster flag in order to obtain the displacement velocity map as a raster, and It has not been created ( note I have also unchecked the Create Geocoded Shape).
And, by the way, is it possible to make the PS map less dense It ha...
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1844 |
26 May 2015 06:49 AM |
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2 Replies and 2031 Views
summing pixel values for a raster file 2031 2
Started by Deleted User
Hello,
I have a raster file where each pixel value represents the volume of a feature across a landscape. I want to find the total volume of the feature in my study region. So I would like to sum every pixel value in the raster file and have a single value which represents the total volume. Is there anyway of doing this in ENVI
Thanks in advance!
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2031 |
26 May 2015 05:50 AM |
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2 Replies and 1657 Views
Change detection tool 1657 2
Started by Deleted User
Has something changed in the Change detection tool in the new version Is there anyway to refresh the steps to detect changes between images
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1657 |
26 May 2015 04:36 AM |
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2 Replies and 1360 Views
Creating Spatial Profiles in ENVI 5.0 1360 2
Started by Deleted User
Dear All;
I am intending to create Spatial Profile that would extract the raster values underlying the polyline. I have found that there is a tool namely 'Arbitary Profile (Transect) that has been provided in ENVI 5.2 SP1 facilitates the user to generate such profiles.
However, I am using ENVI 5.0 where I tried rigorously but didn't found such tool in it.
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1360 |
25 May 2015 03:20 AM |
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5 Replies and 2410 Views
Open AVIRIS data 2410 5
Started by Deleted User
Hello All!
I am wondering how to open Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data in ENVI where all bands are displayed! Although in the .hdr file, it shows that my image includes 27 bands, from "open image file" only 3 bands are listed!
On the list of "Open External File" I can not find the AVIRIS!
Please help!
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5 |
2410 |
22 May 2015 02:04 PM |
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3 Replies and 1534 Views
how to use file with ".000"extensions 1534 3
Started by Deleted User
I have few spectrum files with extensions '.000', '.001' etc.. and their .text versions also. I want to convert them to .asd format.
also some spectrums are of different scales and hence not being used for detection purpose. how to manipulate the scales of these spectras.
I actually want to perform target detecting using those as target spectrums.
does anyone have an idea how to accomplish that, please suggest.
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1534 |
21 May 2015 05:09 AM |
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2 Replies and 1490 Views
Feature Extraction, Segmentation 1490 2
Started by Deleted User
Hi all!
I'm using the feature extraction tool and am wondering if there is any way to run the segmentation of an image one time and be able to save it, and open the tool again but not have to run the segmentation step again and just import it in the example based FE tool. So far, I haven't found and good options. Thanks!!
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1490 |
20 May 2015 02:55 PM |
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4 Replies and 1654 Views
thor target detection 1654 4
Started by Deleted User
while performing target detection using thor target detection for single file tool I am facing an error "SVDC:SVDcmp_d did not converge" and before opening viewer its giving "no signature matching routine has completed successfully" and its not generating any rule image.
please help me to resolve this problem
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1654 |
20 May 2015 05:05 AM |
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1 Replies and 1682 Views
Error: No module called envipy 1682 1
Started by MariM
When working with the ENVI tools for ArcGIS, I get this error message trying to use a tool:
"Error: No module called envipy"
How can I fix this
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1682 |
19 May 2015 08:18 AM |
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2 Replies and 1413 Views
Help doing supervised classification using texture data 1413 2
Started by Deleted User
I have a panchromatic image, of which I created a texture map. I want to use this information to do a supervised classification. I was going to create three ROI classes: bare ground, buildings, vegetation. I've performed supervised classification in ENVI using spectral data but never pan data. More specifically I'm having trouble with my classification recognizing my ROIs in the entire scene. For example, I have if I use a texture map to identify buildings vs. trees. vs. ground in the ROI tool, ...
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1413 |
15 May 2015 10:55 AM |
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2 Replies and 1942 Views
Vegetation Indices - output doesn&39;t make sense. 1942 2
Started by Deleted User
Hello,
Apologies if these are simple questions, I'm new to ENVI and struggling to understand much of the help online! I'd appreciate any advice on any of these issues.
I am trying to calculate indices to look at vegetation damage/stress over time using landsat 8 images with the bands stacked. I've used both the band math and spectral index tools to try and calculate Enhanced Vegetation Index. In the band math tool I entered the expression (2.5*((B2-B1)/(B26*B1-7.5*B31))) where B1= red B2=NIR a...
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1942 |
13 May 2015 10:13 AM |
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1 Replies and 1688 Views
Error with FLAASH 1688 1
Started by Deleted User
&160;I am running FLAASH in ENVI 5.0 and trying to do atmospheric correction on airborne hyperspectral data. The data has level 1b radiometric corrrection applied and is in nWcm-2sr-1nm-1 unsigned interger. I have applied the band math float(b1) followed by converstion from bsq to bil as an input radiance image for FLAASH. However I am continiously getting the error: "ACC error: avrd: IDL error: POINT LUN: Negative position argument not allowed. Position -204215960, Unit 102" See bel...
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1688 |
12 May 2015 09:23 AM |
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10 Replies and 4894 Views
Calculating Proportion of Vegetation using NDVI 4894 10
Started by Deleted User
Hello all; I am facing problem to enter a simple syntax in ENVI's Band Math to derive proportion of vegetation.
Pv =&91(NDVI-NDVImin)/(NDVImax-NDVImin)&932
How would I enter this expression in ENVI. I have NDVI raster with Min value of -0.445443 and Max 0.683279
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10 |
4894 |
12 May 2015 04:26 AM |
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1 Replies and 1694 Views
convert Image to image GCP to Map 1694 1
Started by Deleted User
I am georeferencing a series of images, to a common georeferenced airphoto base, via image to image registration. I will subsequently have to continue to georeference derivative images made from the original files (before georeferencing). I'd like to convert the saved ground control points file from image to image points, to image to map points, to free myself dependence on the original airphoto. Is there a way using ENVI to automatically extract the map coordinated for the image coordinate ...
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1694 |
11 May 2015 02:31 AM |
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1 Replies and 1823 Views
How to collect spectral samples from all pixels of a ROI 1823 1
Started by Deleted User
Dear All,
I would like to collect sample spectra from each of the pixels of a particular ROI. Please explain me how to extract.
When I tried I could get only the mean spectra of a particlular class (ROI). But for analysis purpose I need all samples of that ROI.
Suggest me some ideas. Thanks in advance.
Regards,
Arun Prasad Kumar
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1823 |
07 May 2015 12:03 PM |
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1 Replies and 1382 Views
Listing Bands and wavelength 1382 1
Started by Deleted User
Simple question that I should know, but how do I list the bands and their wavelengths for datasets that I load into ENVI I have AVIRIS data loaded.
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1382 |
29 Apr 2015 01:13 PM |
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1 Replies and 2056 Views
spectral resampling to sensor resolution 2056 1
Started by Deleted User
I have a question regarding the options for spectral resampling in ENVI and I would like to better understand when ENVI does in the background.
For an image with defined sensor type and defined wavelengths per band, I can perform a spectral resampling to a 'pre defined filter function'. These filter functions can be found in the envi install directory and seem to be identical to the sensor specific spectral response functions.
What happens exactly computationally when I perform spect...
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2056 |
29 Apr 2015 07:10 AM |
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2 Replies and 1566 Views
Multitemporal series with Landsat 5 and 8 1566 2
Started by Deleted User
Hi,
I understand that for creating a Landsat time series for vegetation analysis using Lansat 8 and 5, the radiometric of L8 should be scale to the L5, that is, the L8 radiometric resolution should be scaled from 16 to 8 bits. Is that correct how could I perform that in ENVI
Thank you in advance!
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1566 |
28 Apr 2015 01:44 PM |
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4 Replies and 1696 Views
Viewing header in a ASTER .hdf file 1696 4
Started by Deleted User
Hello,
I'm trying to view the header information inside an ASTER Level 1B .hdf file. I have been told that inside the header file will be information (specifically, I need to find the solar zenith angle at time of acquisition) necessary for me to calculate albedo and land surface temperature (LST).
The ASTER .hdf file I'm using is here:
http://e4ftl01.cr.usgs.gov//ASTER_B/ASTT/AST_L1B.003/2001.01.20/AST_L1B_00301202001180838_20110120003355_23051.hdf
Any help is appreciated. Thank you.
Jon
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1696 |
28 Apr 2015 10:38 AM |