[Qgis-user] Polygon from 4 points

[Ryan Peel]

Extending this thought a little.  Is there a way to create a WMS service
from this so that the WMS reads a csv file, automatically creates the
polygons using the expression that Toto recommended, so that it (on the
fly) creates the polygons from adding the WMS to a map so I can share with
my co-workers so that we are all using the updated data (rather than having
to share a shp file).

Long question, hoping for maybe an easy solution.

Ryan
VB Fiber

On Thu, Nov 26, 2020 at 12:59 PM Ujaval Gandhi <ujaval at spatialthoughts.com>
wrote:

> Totò - really great solution! Didn't know about Geometry by Expression and
> it will come in handy for sure.
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> On Thu, Nov 26, 2020 at 8:33 PM Totò Fiandaca <pigrecoinfinito at gmail.com>
> wrote:
>
>> From Processing:
>>
>> search for Geometry by Expression:
>> 1. as input layer put your file with the coordinates
>> 2. and write this expression:
>>
>>   make_polygon (
>>   make_line (
>>   make_point ("x1", "y1"),
>>   make_point ("x2", "y2"),
>>   make_point ("x3", "y3"),
>>   make_point ("x4", "y4")
>>   ))
>>
>> and launch the geoprocess.
>>
>> I used QGIS 3.16 Hannover
>>
>> Il giorno gio 26 nov 2020 alle ore 15:48 Ryan Peel <ryanpeel at gmail.com>
>> ha scritto:
>>
>>> I have a csv/table that has a single row that contains some metadata as
>>> well as four SEPARATE columns, x1, y1, x2, y2, x3, y3, x4, y4 of decimal
>>> degree coordinates.
>>>
>>> I want to import all of this data into QGIS and create a polygon from
>>> the four points as a vector layer.
>>>
>>> What is the best way to do this?  I'm not a programmer or scripter
>>> really and fairly new to QGIS.
>>>
>>> Thanks!
>>>
>>>
>>> *Ryan Peel*
>>>
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>>
>>
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