[Geotiff] Easier way to Georeference TIF's?

[Gary Stephenson]

If you have AutoCAD available, Raster Design runs on top of AutoCAD or
AutoCAD Map and can georeference your charts and export to GeoTiff
readily. 

 

Gary

 

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From: geotiff-bounces at lists.maptools.org
[mailto:geotiff-bounces at lists.maptools.org] On Behalf Of Dennis Megarry
Sent: Tuesday, April 18, 2006 10:41 AM
To: geotiff at lists.maptools.org
Subject: [Geotiff] Easier way to Georeference TIF's?

 

I've spent a great deal of money trying to find the best solution for
georeferencing my scanned charts without much luck.  I'm hoping someone
on this list may have a better solution..

 

I scan 47 charts every 56 days, I have about 2 days to get these
georeferenced out out the door.  Each chart has lat/lon lines and I have
all the projection info for them.  

 

What I have done so far:

 

Global Mapper:

 

This is a very good package, but takes about 1/2 an hour to rectify a
scan chart, doesn't have any options for what math it uses when
generating the Georeferenced chart, so the edges fall off sharply if you
can not get the edges rectified close enough.  Also, takes FOREVER to
generate a GeoTIFF!  anywhere from an hour to 1.5 hours.  I though it
was may machine, so I built a box with the latest and greatest AMD CPU I
could find ($1200 ouch!), put 2GB's of fast RAM in there and a 300GB
7500RPM drive with a dual monitor graphics card.   Still takes an hour
or more.. ARGH!

 

ESRI ArcGIS 9.1

 

Tried rectifying a chart in ArcMAP, was VERY fast and easy.  Lets me
choose what methode it uses to calculate the reference points.  Only
problem is, you can't export a GeoTIFF in any resolution other than
screen resolution..  And I then have to go back and add the coordinate
system to each chart.  Tried writing VB code using ArcObjects to export,
but still having problems exporting (mainly the extends).

 

I found a photshop plugin from another company that lets you
georeference charts in PhotoShop CS, but ARGH!  Way to difficult, and
lacks the ability to bring in another chart as a reference.

 

Anyone know of something better that I can use to speed up this process?
I haven't tried Manifold yet (no eval version).    Or better yet, does
anyone offer plugin's for ArcMAP that will solve me problems?

 

Thanks!

 

Dennis

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