merge Airphoto images

[chen...@yahoo.com]

HI, all:

I am currently have 4 georeferenced high resolution air photos (1 GB
each) which covered different quarter sections (NW, NE, SE, SW) of th
area I am interested. I wonder if there is a tool / method that I can
use to combine all 4 images into one and then converted to a little
bit small format (1GB or less in total size) which still keep fair
image quality.

Thanks for your feedbacks.

Kevin

[Mats Elfström]

Hi Kevin!

Assuming all photos are correctly geo-referenced, I would open them all in a mapper, then save the mapper window to a new image file with a suitable resolution.

But expect memory problems, or  else a significant loss of resolution.

You don't say what format the images are in. If they are uncompressed tifs, compressing them to ecw would make them smaller and improve performance.

Unfortunately, the free ECW compressor is limited to smaller images and lacks the mosaicking function you need.

ERDAS Imagine can probably mosaic and compress this at the same time, but it's a heavy investment, and you won't escape the need for plenty of RAM and processor power. An alternative would of course be to buy the service from some firm that has the proper tools and equipment.

HTH Mats.E

2010/10/25 chen...@yahoo.com <chen...@yahoo.com>

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[Tim Rideout]

Do you have access to Photoshop CS3 or above? If so then download the
Geographic Imager plugin from www.avenza.com, open your images, click
the mosaic button and then save the new combined image. GeoImager should
automatically detect the world / tab information to located each image.

You get two weeks free use, so won't cost you anything either.

Regards

Tim

Dr Tim Rideout
Director

XYZ Win Awards - at the British Cartographic Society on June 10th our
Postcode Sector Map - London won the Stanfords Award for Best Printed
Map 2010, & at International Map Trade Show on Feb 26th, the People's
Map London won the Silver Award for Best Digital Product, Millennium
House World Atlas won the Gold Award for best map book, the AGT
GeoCentre World Map in Russian won the Gold Award for best flat map. All
contain maps by XYZ.
Visit XYZ at the Frankfurt Book Fair October 6th - 10th 2010, Stand 3.1
L649.
The XYZ Digital Map Company
Unit 9-11 Hardengreen Bus.Pk.
Dalhousie Road,
Dalkeith,
EH22 3NX
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[college.atlas]

Kevin,
I'm a big fan for th FWTools\GDAL open source projects.

You could use gdal_merge to merge the files and then use
gdal_transldate to convert the image.

As Mats said you haven't mentioned the format of the current images.
ECW would give you great compression without compromising quality too
much.

On Oct 26, 7:55 am, "Tim Rideout" <tim.ride...@xyzmaps.com> wrote:
> Do you have access to Photoshop CS3 or above? If so then download the

> Geographic Imager plugin fromwww.avenza.com, open your images, click

> the mosaic button and then save the new combined image. GeoImager should
> automatically detect the world / tab information to located each image.
>
> You get two weeks free use, so won't cost you anything either.
>
> Regards
>
> Tim
>
> Dr Tim Rideout
> Director
>
> XYZ Win Awards - at the British Cartographic Society on June 10th our
> Postcode Sector Map - London won the Stanfords Award for Best Printed
> Map 2010, & at  International Map Trade Show on Feb 26th, the People's
> Map London won the Silver Award for Best Digital Product, Millennium
> House World Atlas won the Gold Award for best map book, the AGT
> GeoCentre World Map in Russian won the Gold Award for best flat map. All
> contain maps by XYZ.
> Visit XYZ at the Frankfurt Book Fair October 6th - 10th 2010, Stand 3.1
> L649.
>  The XYZ Digital Map Company
> Unit 9-11 Hardengreen Bus.Pk.
> Dalhousie Road,
> Dalkeith,
> EH22 3NX
> Tele: +44 (0) 131 454 0426
> Mobile: +44 (0) 7766 825937
> Fax: +44 131 454 0443

> Email: tim.ride...@xyzmaps.com

> Web:www.xyzmaps.com
>
>
>
>
>
>
>
> -----Original Message-----
> From: mapi...@googlegroups.com [mailto:mapi...@googlegroups.com] On
>

> Behalf Of chensu...@yahoo.com

[Natalie Bennett]

Hi Kevin,

Have you also tried using the Seamless Table Manager tool - for no cost or hassle, this is really a great solution. It is not a permanent merge, but really, users generally don't know the difference.

I have a similar situation as you - I have 6 image tiles which overlap slightly and instead of opening them all, I add the new Seamless table only. I have even made the original 6 tables and their images as Hidden in Windows Explorer (START+E) so that users only see the single table.

Regards

Nat Bennett
GIS Officer
Wellington Council
(02) 6840 1728

>>> "college.atlas" <colleg...@gmail.com> 26/10/2010 4:17 pm >>>

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