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ENVI image-->BIL-->ArcMap   Nick Matzke Jan 09, 2003
Re: ENVI image-->BIL-->ArcMap   Nick Matzke Jan 16, 2003
Re: ENVI image-->BIL-->ArcMap   Melita Kennedy Jan 16, 2003
Re: ENVI image-->BIL-->ArcMap   Christine Wiedinmyer Jan 20, 2004
Re: ENVI image-->BIL-->ArcMap   Melita Kennedy Jan 20, 2004
Re: ENVI image-->BIL-->ArcMap   Antoine Stevens Jan 27, 2004
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Subject ENVI image-->BIL-->ArcMap 
Author Nick Matzke 
Date Jan 09, 2003 
Message Howdy,

This isn't a question, but I'm just so pleased with figuring something out that I will post it here in the hopes that it will help someone else (searching on ENVI conversions didn't bring up anything here, which there needs to be).

I've got several Landsat ETM scenes which are georeferenced in ENVI3.5.

My problem was:
I used various ENVI image export routines to get to something ArcGIS could use, e.g. BIL or TIFF.

The images are from Madagascar and are in an obscure Madagascar-specific georefencing system:

HOM (Hotine Oblique Mercator) aka LaBorde
Datum: Tannanarive 1925, etc.

Problem was, once these were imported into ArcCatalog, and the projection matched to my coverage files (also in the above projection), the Landsat images were out in the middle of the Indian Ocean, rather than Madagascar!

After much plinking and futile web searching, here was the solution:

My coverages were in Oblique Mercator (Hotine) "Natural Origin", but my images needed Oblique Mercator (Hotine) "Azimuth Center". Made this change and re-entered the referencing parameters (annoyingly cleared when you switch between types of HOM projections) and everything lined up perfectly.

I know, I know, this is a ridiculously specific problem/solution, but perhaps it will help someone...

(BTW, it is also useful to know that ENVI has put up an add-in that outputs image projections to a text file:

ENVI User Function that outputs an ASCII text georeferencing report file
http://www.rsinc.com/services/techtip.asp?ttid=2770 
  Nick Matzke
Grad student
UC Santa Barbara
Geography Dept.
http://www.geog.ucsb.edu/~matzke/ 
   
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Subject Re: ENVI image-->BIL-->ArcMap 
Author Nick Matzke 
Date Jan 16, 2003 
Message Tonight I tried to do *exactly* the same thing, but with a grid.

Weirdly, if you do Right-click-->Properties-->Spatial Reference-->Edit in a grid, you *don't* get the modify, clear, etc. projection window that you get when you do the same thing with images; rather it just dumps you in the projection Wizard which doesn't give you access to the slightly different kinds of HOM projections discussed above.

However it appears that if you convert *from* a correctly projected BIL the grid comes out correctly projected without further editing.

Nick 
  Nick Matzke
Grad student
UC Santa Barbara
Geography Dept.
http://www.geog.ucsb.edu/~matzke/ 
   
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Subject Re: ENVI image-->BIL-->ArcMap 
Author Melita Kennedy 
Date Jan 16, 2003 
Message Coverages and grids still use the ArcInfo workstation PROJECT code
for defining the coordinate system. Some map projections (and
datums and spheroids) are supported in the ArcGIS system but
not in the PROJECT code and vice versa.

You won't be able to define the coordinate system for the grid
because PROJECT doesn't support the Hotine Azimuth Center
map projection but it does have the correct coordinate values.

Melita 
  Melita Kennedy
ESRI Product Specialist 
   
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Subject Re: ENVI image-->BIL-->ArcMap 
Author Christine Wiedinmyer 
Date Jan 20, 2004 
Message HI there. I have a question for you...

I have a file that was exported from ENVI (actually, 2 files, one with the *.hdr extension).

How do I bring this into ArcGIS?

Thanks!
Christine
 
   
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Subject Re: ENVI image-->BIL-->ArcMap 
Author Melita Kennedy 
Date Jan 20, 2004 
Message Hopefully, someone else will answer because I don't know that much about rasters! Rasters in a BIL format are supported by ArcGIS. Does ArcCatalog recognize it as a raster file? What are the contents of the .hdr file?

You might need to georeference it or set its coordinate system (spatial reference) to get it to line up with other datasets.

Melita 
  Melita Kennedy
ESRI Product Specialist 
   
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Subject Re: ENVI image-->BIL-->ArcMap 
Author Antoine Stevens 
Date Jan 27, 2004 
Message Hi,

actually, there is a .dll created by research system which "use ENVI format raster data to query, preview, and manage using ArcCatalog; to
visualize using ArcMap; and to analyze using Spatial Analyst. ENVI format raster
datasets can be used the same as other raster data formats supported in ArcGIS". Follow this link :http://www.rsinc.com/pr/detail.asp?PRID=96