[Qgis-user] vector layer only displays when zoomed out to layer extent

[Nicolas Cadieux]

Hi,

If you have a very long straight line represented by only two point, reprojection operates only on those two points (called vertices or nodes).  The lines just represent a straight connections between two point.  The problem is that the earth is round (contrary to some popular belief :) and those long straight lines need to be bent depending on the projection being used.   Since reprojection and zooming only operates on vertices or nodes, densification adds nodes to the line giving more points to calculate and thus, less errors.
Cheer!
Nicolas



> Le 16 déc. 2019 à 10:23, Lee Eddington <lee.w.eddington at gmail.com> a écrit :
> 
> Hi Nicolas,
> 
> Vector densification worked.  I went with the default 1 vertices to add and it created a new layer that now displays at any zoom level.  Can you explain why my original layer doesn’t display?
> 
> Thanks,
> Lee
> 
> 
>> On Dec 14, 2019, at 3:13 PM, Nicolas Cadieux <nicolas.cadieux at archeotec.ca> wrote:
>> 
>> Hi,
>> 
>> Try matching the project CRS to the layer CRS.  Make sure you don’t have a scale rendering option. If it’s not that, try vector densification. Could work.
>> 
>> Nicolas
>> 
>>>> Le 14 déc. 2019 à 16:38, Lee Eddington <lee.w.eddington at gmail.com> a écrit :
>>> 
>>> I have a vector layer of lines that span -360 to 360 deg.  They display fine when I’m zoomed out full, but if I zoom in to any degree they disappear.
>>> 
>>> I’m using 3.4.14 on a Mac.
>>> 
>>> Lee
>>> 
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