Does anybody know if it's possible to create a round map frame in QGIS Map Composer to create circumpolar maps?
[GIS] Is it possible to create a round map frame in QGIS Map Composer to create circumpolar maps
cartographyprint-composerqgis
Related Solutions
There is Resize page to content option in Composition tab (QGIS 2.18). You can set the margins and click on the Resize page button.
Below a solution found by @ndawson in the comments of the question. Please feel free to comment and enhance this answer.
Run from the processing toolbox the Oriented minimum bounding box tool onthe map enveloppe grid you already use.
It will create a layer that should be quite identical to your original layer. You will find in the attribute table an ANGLE field
You should now be able to use this ANGLE field in the composer to fill in the data defined field for rotation :
The problem seems to be the angle is not always easy to use because it depends on the way the initial polygons are made. I did a few tests and it depends in which way you have drawn your source polygons. You may have to tweak the attributes values of the ANGLe field accordingly :
(red is original polygons, in black the OMBB tool polygons). I digitalized for the exemple similar polygons is two different ways (going right or left)
To get back the angle value to your original layer, you could use a spatial location join operation.
Best Answer
There's currently no out-of-the-box functionality for this in Print Composer. As a work-around, you can add graticules as a separate layer and label their end points, like here:
For a full how to, see https://anitagraser.com/2016/05/01/how-to-create-round-maps-in-print-composer/
(Example uses data from http://www.quantarctica.org/)