[Geotiff] Linear Units of Projections Parameters

[Duncan Chaundy]

Hi Frank,

Yes, I have been working on what the PCI behaviour is and why and how it
compares to other software. No firm conclusions yet, but there are
certainly some problems. I looked at the KRGMaps. I have Lexington at
120W 4N!

Duncan
PCI Geomatics



-----Original Message-----
From: geotiff-bounces at lists.maptools.org
[mailto:geotiff-bounces at lists.maptools.org] On Behalf Of Frank Warmerdam
Sent: Monday, February 27, 2006 2:37 PM
To: pw
Cc: geotiff at lists.maptools.org
Subject: Re: [Geotiff] Linear Units of Projections Parameters

pw wrote:
> Hello,
> 
> That's a good question. I don't think I've really taken much notice
> until this question was posed.
> 
> I use primarily ENVI (RSI) and Geomatica (PCI) and as far as I
> remember I have never had a GeoTiff image that wasn't in a meter
> based projection.

Peter,

It would be helpful to know specifically if ENVI or Geomatica handle
the false easting and northing properly.  I wrote the original
Geomatica GeoTIFF handling, but can't recall the details.  I suspect
I assumed it was in meters since that is what the internal GCTP
code at PCI looks for.   Actually, I should be able to check this with
the PCI free viewer.  Is there still an ENVI free viewer?

Reports indicate ArcGIS and Imagine assume the false easting and
northing
in GeoTIFF are in meters.  I'm not sure if this might be my fault or
not.
I did some work on that GeoTIFF code too, but I don't *think* I worked
on
the projections details.

The rest of your email seemed tangential to the issue at hand.

Best regards,
-- 
---------------------------------------+--------------------------------
------
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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