[Qgis-user] manual classification tool?

[chris hermansen]

All,

Assuming the buildings are polygons, what about having five point layers,
one for each class? Select a point layer, open it for editing, add points
within building polygons of that point class. When done save and close the
point layer and move on to the next. Then use the point within polygon
overlap to set the polygon values.

No need to set any attributes.

Each classifier could have their own set of five point layers to use in
their own sector.

On Thu, May 28, 2020, 04:30 Nicolas Cadieux <nicolas.cadieux at archeotec.ca>
wrote:

> Hi,
>
> I see many people have responded exactly to your question so I have a
> question for you. I am playing the devil’s advocate.  What are your
> classification?  Can any of this be classified any other way than manually?
> You could save time if you could preclassify building and only check the
> results manually?  Can size, shape, or colour help?  Can you use another
> data base like a city map or sensor data help?  Can you use satellite
> images to do some preclassification?  Have you thought of using AI with
> aerial photography?
>
> If not, can you build a tool that will permit you to select multiple
> buildings at a time and only enter the information once?
>
> Nicolas Cadieux
> Ça va bien aller!
>
> >> Le 28 mai 2020 à 02:33, Raymond Nijssen <r.nijssen at terglobo.nl> a
> écrit :
> > Does anyone know if there is a tool in QGIS to quickly classify
> features manually?
> >
> > I have a layer with 17,000 buildings, all need to be set to 1 of 5
> values. I'm thinking about making a (quick and dirty) plugin that:
> >
> > - On clicking the building shows a popup menu with the 5 choices
> > - Clicking the choice would update the value and change the color
> (redraw)
> >
> > Every click less really counts here. I already set up a form widget but
> also having the location of the menu near the building polygon is way more
> efficient. (I mean, no need to cross the screen with your mouse cursor.)
> >
> > Thanks!
> >
> > Raymond
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