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1 Replies and 1256 Views
starting envi with IDLDE 7 1256 1
Started by Deleted User
Does anyone know how to start up ENVI4.5 on linux with the new IDLDE 7.0. BY default I seem to get the old development environment.
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1256 |
09 Jul 2008 07:34 AM |
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1 Replies and 1295 Views
trouble with Dynamic Overlay 1295 1
Started by Deleted User
Hi--I have a CORONA image and an aerial photo, both georecitfied with the same projection details, etc. Of course, the spatial resolution is different--but do I need to stack the layers for the dynamic overlay to work I'm not sure what to set the x and y offsets to--whether it's 1,1 for both, or whether one of them is set to a different x,y offset, the images don't register correctly. What am I missing
Thank you--
Steve M.
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1295 |
08 Jul 2008 02:10 PM |
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0 Replies and 1284 Views
Neural Network 1284 0
Started by Deleted User
Hi!
I'm using neural netwoks on ENVI. I want to know how many neurons the hidden layer have and what kind of treatment the image receives before be classifie for neural networks.
Thanks.
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1284 |
08 Jul 2008 06:49 AM |
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0 Replies and 1570 Views
Neural Network 1570 0
Started by Deleted User
I would like do a classification by neural network but a don't know how to do
Somebody can I help me Where I can find a tutorial about this Because I onle have the user help of ENVI.
Thanks to all.
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1570 |
08 Jul 2008 06:49 AM |
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1 Replies and 1688 Views
Spectral Resampling 1688 1
Started by Deleted User
Dear all,
I recently started to use ENVI. I want to do spectral resampling of HyMAP Imagery based on SPOT5 imagery. For this I used the build in funtion of ENVI spectral resampling and use the filter for SPOT5. But I want to know about the claculation procedure involved for the resampling. I believe ENVI also uses the gaussian distribution often called spectral response function to claculate weight. But I want to know detail claculation. Any help will be greatly appreciated.
Regards
Pujan
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1 |
1688 |
07 Jul 2008 08:22 AM |
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1 Replies and 1259 Views
Applying Projection Info to output data 1259 1
Started by Deleted User
Dear Forum Readers,
I am a new user to ENVI, and so this question is probably very basic!
When processing an image, such as running an unsupervised classification, NDVI, subsetting an image etc. the resultant images have no projection info. The input images are .TIF format with a tfw world file associated with them. I am using ENVI 4.4 ,without an IDL licence.
I tried using File/Edit ENVI Header process to apply the correct projection but without success! How do I apply the projection ...
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1259 |
03 Jul 2008 03:35 PM |
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1 Replies and 1516 Views
FLAASH 1516 1
Started by Deleted User
I am trying to run FLAASH but am having difficulty in creating the .sli file that is required. I do not use FLAASH regularly and apparently am rusty
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1516 |
02 Jul 2008 09:06 AM |
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1 Replies and 1325 Views
can ENVI_RESAMPLE_SPECTRA operate on arrays of spectra? 1325 1
Started by Deleted User
the help file on this seems to contradict itself. This is the description for the input wavelength keyword:
I_Spec
A one-dimensional array of input spectra to be resampled.
'One-dimensional array' seems to imply a single spectrum, but the word 'spectra' being plural clearly implies more than one spectrum. Three other keywords (I_wl, O_wl, and O_spec) all say the same thing as this.
Also, if the routine only operates on one spectrum at a time, and returns one spectrum at a time, why...
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1325 |
01 Jul 2008 01:24 PM |
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0 Replies and 1453 Views
detection of chlorophylle 1453 0
Started by Deleted User
i need informations at the deffrentes processing of the image seawifs
thak you
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1453 |
27 Jun 2008 10:00 AM |
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1 Replies and 1402 Views
Problem with display linking of a subset image 1402 1
Started by Deleted User
Hi there. I have a Quickbird panchromatic image, and I am using this to spatially subset a separate multispectral image, also from Quickbird. Both files seem to be georeferenced correctly, and the Geographic link works fine. But the link displays option is wrong for some reason. It associates coordinate 1,1 in the new image with coordinate 1720, 2400 (or something like that) in the original image, which I assume is normal--however the displays do not line up at all. I tried changing setting...
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1402 |
25 Jun 2008 12:54 PM |
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1 |
2413 |
25 Jun 2008 12:39 PM |
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1 Replies and 1527 Views
Envi Geotiff failed to open in ArcGis 1527 1
Started by Deleted User
Dear friends,
I have MODIS Level 2 SST data from oceancolor. Manage to open it using EPOC in ENVI. And manage to save it as *.tif file.
But when I open the tiff file in ArcGis, it doesnt carry the same SST value. I only got one SST value for the whole image. The projection is correct.
Anybody can help me on this
Thanks in advance guys,
Idham
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1 |
1527 |
17 Jun 2008 03:50 AM |
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1 Replies and 1573 Views
polyline vector 1573 1
Started by Deleted User
Hi
how can i create a polyline vector from two points
in batch mode interpolating between two points its
very boring and 'visually' not accurate
thx
Wojtek
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1573 |
16 Jun 2008 01:22 PM |
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1 Replies and 1718 Views
How to clip a vector file? How to perform vector-to-raster convertion? 1718 1
Started by Deleted User
I have two questions:
1) How to clip a vector file
How do I clip a specific area from a vector file
I have two vector files (.evf). I want to use one those (smaller) to clip the other one (bigger). How can I do this
Is it possible to do this using ROIs I already converted the smaller vector file to a ROI but then I cannot use this ROI to clip the same area in the other bigger vector file. It seems thats this only works with raster images.
2) How to perform vector-to-raster convertio...
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1718 |
16 Jun 2008 09:34 AM |
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0 Replies and 1623 Views
orthorectification 1623 0
Started by Deleted User
In ENVI's orthorectification process (starting with Build RCPs in this tutorial: http://www.rsinc.com/Envi/docs/tutorials/Orthorect_Aerial.pdf ),
after building the interior and exterior orientation, I try to bring in my DEM
and it says that the DEM and the image do not match (not sure if that is exactly what it said).
What I have is a large rectangular DEM of the area and the aerial photograph I am trying to orthorectify lies within the DEM.
Do I have to create a clip within the DEM of the...
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1623 |
11 Jun 2008 11:39 AM |
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1 Replies and 1478 Views
Spatial subset by ROI, inclusion/exclusion rules ? 1478 1
Started by Deleted User
I'm extracting image statistics using ROI as spatial subset and i would like to know more about the rules regarding the inclusing/exclusion of a given pixel.
Is it based on the pixel area included in the AOI or the position of the pixel center
For ex.:
* If 50 of pixel area is included within the AOI, then pixel is considered in the statitics
* If the gravity center of pixel is included within the AOI, then pixel is considered in the statitics
Thanks in advance
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1478 |
11 Jun 2008 09:01 AM |
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1 Replies and 1593 Views
DEM extraction for PRISM- RPC coefficients 1593 1
Started by Deleted User
Hello:
I work with ENVI software and would like to utilize its capability of DEM Extraction from stereo images of PRISM triplet images. After purchasing some scenes (both L1B1 and L1B2), I've learned that the RPC (rational polynomial coefficients) do not come as part of the data order. I had presumed they'd be in the metadata somewhere or an associated file. Can someone instruct me or point me towards a reference for their computation or how to obtain I saw a reference that RESTEC can su...
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1593 |
09 Jun 2008 07:12 AM |
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3 Replies and 4674 Views
Jeffries-Matusita distance 4674 3
Started by Deleted User
When I read about the Jeffries-Matusita distance I find info that it ranges from 0 - 2000 or 0 to the sqrt of 2, yet in ENVI the values range from 0 to 2.0. Can someone explain this
Thanks!
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3 |
4674 |
06 Jun 2008 11:38 AM |
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1 Replies and 1557 Views
data value to ignore in ENVI ZOOM 1557 1
Started by Deleted User
Is there a way to select a 'data value to ignore' in ENVI ZOOM I often find myself overlaying georeferenced HSI imagery that has a lot of blank space (filled with zeros) over (say) panchromatic imagery. I would like to be able to 'see through' the areas of the HSI image that are zeros, much in the way one can in the mosaic tool in ENVI. Is this possible in ENVI ZOOM If not, is there an equivalent alternative
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1 |
1557 |
02 Jun 2008 03:30 PM |
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1 Replies and 1258 Views
Importing rasters or vectors as ROI--can this be done? 1258 1
Started by Deleted User
Hi there. This may be really simple, but I'm missing something. I have training data that I want to use for a supervised classification. The map was created in ArcGIS, and I have it in both raster and vector format. It's fairly simple--only 4 classes, and a 4 or 5 polygons per class. The attribute table is simple...just the polygon id's and a number, 1-4, denoting the land type. Can I import these as ROI's, so that I don't have to manually merge them every time
Thanks--
Steve
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1 |
1258 |
02 Jun 2008 08:02 AM |