I have two shapefile layers in a Qgis project that have problems with zooming. One is a line I copied/pasted in a new layer from a set of height contours and the other one is a polygon layer I created by dissolving all features in another layer.
In both cases, the layers won't display unless the entirety of the layer shows in the canvas. When I zoom in or drag the view, as soon as part of the layer is out of the canvas the entire layer disappears.
In the case of the polygon layer, if I delete it and generate it again it works properly, but when I start filling the rings it reaches a point when it stops working well (I want to end up with a single polygon enclosing all features in the original layer). I guess it must have to do with the geometry of the layer, but I haven't found the cause.
Both layers previously worked well, and removing them/adding them again doesn't fix the issue.
All other layers in the project work well (including the set of height contours and the polygons layer I used to generate the troublesome layers).
This issue has shown in both Qgis 2.4 and 2.6
Is there anything I'm doing wrong?
Best Answer
My coworkers and I were all having this problem in versions of QGIS that range from 2.6.1 to the new 2.14. The solution we worked out is to run:
Vector > Geometry Tools > Multiparts to Singlepart...
The new shapefile produced will now render at all zoom levels. I believe the issue is that the old shapefile had an incorrect ring order (presuming your file had internal rings) and the fix is therefore similar to running "Repair Geometry" in ArcMap.