[Qgis-user] Accuracy of image export dependent on CPU?

[RKaplan]

Alex:

Thanks for the response.

In generating samples for you to test, I discovered where the problem
was.  Because plain old $5000 AutoCAD can't insert a geo aligned image
(only Map 3D can), I'd developed an application that would read the
world file and insert the image.  This is where the error turned out to
be.  My app wasn't able to adapt to differences in screen aspect ratio
between systems.  Since our users for this application were using $650
Bricscad - which can read a world file - we were able to get the same
results on all of our QGIS installations.  

Sorry about that and thanks again.

Rick Kaplan
CAD Systems Administrator

ECS Corporate Services, LLC   14026 Thunderbolt Place, Suite 300,
Chantilly, VA  20151
T:  571-299-6000   D:  571-299-6006   C: 571-233-6128   F:  703-832-0265
www.ecslimited.com

-----Original Message-----
From: Alex Mandel [mailto:tech_dev at wildintellect.com] 
Sent: Thursday, September 18, 2014 1:32 PM
To: RKaplan; qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Accuracy of image export dependent on CPU?

On 09/18/2014 10:27 AM, RKaplan wrote:
> I've developed an AutoCAD based application that imports geo aligned 
> image markers (blocks) into a plan using EXIF metadata from images 
> taken by GPS enabled cameras.
> 
>  
> 
> The base drawing consists of a JPEG image exported from QGIS (Chugiak
> 2.4.0 Windows XP 32, Windows 7 32 and Windows 7 64).  The images are 
> exported using various NAD27 State Plane CRSs.
> 
>  
> 
> We're running into a situation where, on some of our systems, the 
> image and world file generated by QGIS is off by up to 120'.  The same

> map and data, exported on other systems, will be very close - within a

> few feet of the camera image markers.
> 
>  
> 
> I've only been able to test this on a half dozen systems, but the only

> ones that generate an accurate JPEG/world file are running Xeon based 
> processors.
> 
>  
> 
>  
> 
> Rick Kaplan
> 
> CAD Systems Administrator
> 

So you're using Project -> Save as Image?
Projection on the fly enabled?

Got an image some of us can test with?

Thanks,
Alex