[Qgis-user] meter-scale

[Alexandre Neto]

You probably have an official local  coordinate system in sweden. Project
(save as..) your data into one of this systems. Those systems have normally
less distortions and probably will represent polygon as a square again (or
at least near one)

Alexandre Neto
Em 27/06/2015 18:17, "Nicolas Cadieux" <nicolas.cadieux at archeotec.ca>
escreveu:

> Hi,
>
> If you select a scr from a geographic coordinate sys (like wgs84) too a
> projected sys like utm, you should have the square back. You will need to
> figure in what zone you are.
>
> Nicolas Cadieux M.Sc.
> Les Entreprises Archéotec inc.
> 8548, rue Saint-Denis Montréal H2P 2H2
> Téléphone: 514.381.5112  Fax: 514.381.4995
> www.archeotec.ca
> On Jun 27, 2015 12:27 PM, "Christer Andersson [via OSGeo.org] " <[hidden
> email] <http:///user/SendEmail.jtp?type=node&node=5213237&i=0>> wrote:
>
> Hi,
>
> How to solve this problem?
>
> 1. I measure a square on the ground.
>
> 2. I take latitude and longitude of all four corners with a precision-GPS.
>
> 3. I have succeded in making a map where the four corners are marked and
> the coordinates are along the sides of the A4-paper.
>
> 4. The problem is that the square has been transformed to a rectangle
> because of the latitude shortening.
>
> Is there a solution to multiplay only the longitude by 1/cos(latitude) to
> get back the square?
>
> (I understand that 1/cos(latitude) is only valid for a sphere (not
> spheroid) but I do not know a better formula. The latitude is 60 deg.)
>
> Regards
>
> Christer
>
> Sweden
>
> _______________________________________________
> Qgis-user mailing list
> <a
> href="/user/SendEmail.jtp?type=node&node=5213234&i=0">[hidden
> email]
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
> ------------------------------
>  If you reply to this email, your message will be added to the discussion
> below:
> http://osgeo-org.1560.x6.nabble.com/meter-scale-tp5213234.html
>  To start a new topic under Quantum GIS - User, email
> ml-node+s1560n4125267h38 at n6.nabble.com
> To unsubscribe from Quantum GIS - User, <a href="
> http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4125267&code=bmljb2xhcy5jYWRpZXV4QGFyY2hlb3RlYy5jYXw0MTI1MjY3fDYzNDQ4MjQxNg==">click
> here.
> <a href="
> http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml
> <http://osgeo-org.1560.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id&%2361;instant_html%21nabble%3Aemail.naml&base&%2361;nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs&%2361;notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>"
> style="font:9px serif">NAML
>
>
> ------------------------------
> View this message in context: Re: meter-scale
> <http://osgeo-org.1560.x6.nabble.com/meter-scale-tp5213234p5213237.html>
> Sent from the Quantum GIS - User mailing list archive
> <http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-User-f4125267.html> at
> Nabble.com.
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20150627/59a994bd/attachment.html>