[Qgis-user] Simple Georeference a .png chart

[Jonathan Moules]

Hi Alex,
  It may just be me being slow, but it's not entirely clear what you're trying to accomplish here. As best I can tell the two images are at very very different scales. Are you trying to georeference the Newark close-up onto the Newark-area map?

I believe using a transformation Type of Polynomial 1 should minimise the types of warping that's happening (assuming you don't want any to happen).

Maybe the points you're trying to reference on the map aren't actually correct?
More information about what you're trying to accomplish may help someone offer a suggestion/solution.
Cheers,
Jonathan

-----Original Message-----
From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Atanvarno
Sent: Friday, October 10, 2014 9:28 PM
To: qgis-user at lists.osgeo.org
Subject: [Qgis-user] Simple Georeference a .png chart

Hi All!

I am new to the GIS topic and also new to QGIS. My problems seemed to be very easy, but with my last try I was then running completely wrong and I hope you can help me since I thought I have done everything correctly.

I have added 2 pictures as example (KEWR_AFC.png, KEWR_AGC.png)(originally its a .tiff, but does not matter for this test). On the KEWR_AGC I have drawn the grid lines to make it easier to set some coordinates. Be aware that I made an error on the right side and one gridline is wrong. But for this example and the test it should not matter if its known. Also there is a Reference point in the middle of the chart as confirmation that everything is ok after georeferencing.

On the KEWR_AFC there are a lot of Points already defined with coordinates which can be used to georeference the .png.

I have now tried everything but the result was tilted and shifted in such a way, that it was unreadable or completely unusable because the coordinates have been wrong. Is it because of the variation? Or wrong KGS? I had - depending on the choses options - red lines indicating the tilt/shift with extremely movements...

So can anybody help me how I have to georeference (especially the AGC), that it is correct?

<http://osgeo-org.1560.x6.nabble.com/file/n5166955/KEWR_AGC.png>
<http://osgeo-org.1560.x6.nabble.com/file/n5166955/KEWR_AFC.png>

Thanks a lot already for help in advance!

With best regards

Alex



--
View this message in context: http://osgeo-org.1560.x6.nabble.com/Simple-Georeference-a-png-chart-tp5166955.html
Sent from the Quantum GIS - User mailing list archive at Nabble.com.
_______________________________________________
Qgis-user mailing list
Qgis-user at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user


This message has been scanned for viruses by MailControl - www.mailcontrol.com



Click https://www.mailcontrol.com/sr/giQn8P5nCkvGX2PQPOmvUhStAXlT3N1zrpT7Lef2!gxaoNGgXzKMQx9Dj0pqObNkCOZlUrWwm5KzbAWAmKJQAw== to report this email as spam.

________________________________

HR Wallingford and its subsidiaries uses faxes and emails for confidential and legally privileged business communications. They do not of themselves create legal commitments. Disclosure to parties other than addressees requires our specific consent. We are not liable for unauthorised disclosures nor reliance upon them.
If you have received this message in error please advise us immediately and destroy all copies of it.

HR Wallingford Limited
Howbery Park, Wallingford, Oxfordshire, OX10 8BA, United Kingdom
Registered in England No. 02562099

________________________________