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0 Replies and 167 Views
geotifs and using them in ArcMap 167 0
Started by Angela Lo
Hello! I have an Aster geotif and I have no problems opening it up in ArcMap. The problem I have is that the geotif is too large. I'd rather have a smaller image so things will load faster in ArcMap. Does anyone know how to crop a geotif how do I prevent losing the georeferenced data from the geotif when I crop it
thank you in advance!
Angela Lo
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167 |
10 Apr 2003 02:33 PM |
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2 Replies and 149 Views
Writing to a specific line of a BIP or BIL file? 149 2
Started by Jonathan Greenberg
Hi all:
I was hoping someone might know, using an IDL and/or ENVI function, how do I write data to a specific LINE of a BIP or BIL file Its easy to read it (envi_get_slice), but not easy to write that slice (how come no 'envi_write_slice'). The brute force is to load the entire image into memory, assign that specific line the new values, and then rewrite the entire image back to disk. This is EXTREMELY slow. Even using ENVI's spectral tiling routines (which at least minimize the memory ...
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149 |
18 Mar 2003 07:43 PM |
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0 Replies and 172 Views
About spectral libraries comparison 172 0
Started by Rannia Mavrantza
Dear forum members,
My little problem is the following:
I have a Landsat-tm5 calibrated to reflectance. The Z-Profile of any pixel in the image has as x-axis the integer number of TM-bands (e.g 1 to 7), while the x-axes of the incorporated spectral libraries to ENVI are in Wavelength (from 0.49 to 2.43 I think) when resampled (with the corresponding tool) to TM5 data. So, how is it possible to compare these two diffent kind of information so as to use the hyperspectral capabilities of ENVI o...
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172 |
12 Mar 2003 07:20 AM |
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2 Replies and 127 Views
Exporting Aster geotif image to ArcMap 127 2
Started by Mal Jones
Good morning all,
When I export an Aster scene as a Geotif, and import it into ArcMap, the image is flipped. Features that were formerly in the northeast are now in the southwest etc. Coordinate info is WGS84, SUTM55.
The same Geotif file is correctly displayed in applications such as ER Viewer and MapInfo; Geotif's from other sources display correctly in ArcMap, so I suspect that there is something in the way Envi creates a Geotif that is causing the problem in ArcMap. It may be that the p...
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127 |
11 Mar 2003 02:49 PM |
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0 Replies and 229 Views
database support 229 0
Started by Arafat Aydiner
Can ENVI directly load images from an image database or Does it have an interface for traditional image databases
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229 |
28 Feb 2003 10:35 AM |
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0 Replies and 213 Views
Classifications 213 0
Started by Cesar Santos Gonzalez
Hi everyone,
Sometimes I have to export classification images into tif format files to make certain manipulations. But after that I'd like to convert it back into an ENVI classification image to be able to use the classification capabilities. Does anyone know if it's possible to make that conversion.
THANKS
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213 |
28 Feb 2003 06:12 AM |
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1 Replies and 231 Views
Spectral band maths 231 1
Started by Alexandre Leroux
A simple issue where I see no solution with the runtime version of ENVI. What do you think
(A) In ENVI RT 3.5sp1, if I try to use 'Menu/Spectral/Spectral resampling' for data which wavelength is in nm (example: 400 nm to 2500 nm) and try to use ENVI's 'Pre-defined filter function', it will not work (error message
telling me all bands are out of range) because ENVI is waiting for wavelenght data between 0.4 and 2.5 instead of between 400 nm and 2500 nm.
There is no way to specify the unit ...
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231 |
16 Dec 2002 07:17 AM |
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0 Replies and 223 Views
How to calculate raidance and iradiance in ENVI? 223 0
Started by Xuwei Chen
I am a new user of ENVI. I am now trying to create temperature maps from the thermal band of Landsat TM. But I don't know which tool I can use in ENVI. Besides, because Landsat 7 has both low gain and high gain in the 6th band, which one should be used for calculating those parameters
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223 |
14 Nov 2002 10:53 AM |
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169 |
08 Nov 2002 11:31 AM |
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0 Replies and 155 Views
Looking for vegetation 155 0
Started by Rushi Maddula
How can i intrepret the MODIS data looking for vegetation areas by using ENVI.
can i look for vegetation on MODIS/TERRA VEGETATION INDICES 16-DAY L3 GLOBAL 250M ISIN GRID V003
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155 |
07 Nov 2002 10:09 PM |
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0 Replies and 267 Views
What's the status of ENVI for MacOS X? 267 0
Started by Jonathan Greenberg
I have been receiving the IDL betas for a few months, but would like to know if/when ENVI is due out for MacOS X
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267 |
04 Oct 2002 03:04 PM |