Buffers (Circle) in PostGIS

Question

I have to extend the normal GeoJSON format to add some unsopported polygon like Circle.

{
 \"type\": \"Circle\",
 \"radius\" : 0.001,
 \"coordinates\": [
            


        

Answer 1

May be you can try this it is for a zone one kilometer in diameter like. I test it and it works for me:

SELECT ST_Buffer(  
    ST_MakePoint(-122.325959,47.625138)::geography, 
    1000)::geometry;

See here for better understanding. I didn't test it but hope it will help you.

To recap a bit what Abdullah Alger did in the solution that you can see in the link above:

First he has a database called stores with latitude and longitude column no geometry column with Starbuck dataset.

Then he adds geometry with the query:

SELECT AddGeometryColumn('stores', 'geom', 4326, 'POINT', 2); 

After that update the geom column