Postgres/PostGIS query for buffer and spatial 'shifted' point
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| CAST( | |
| -- make collection | |
| st_collect(ARRAY[ | |
| -- make line from two range polygons | |
| st_difference( CAST( | |
| st_buffer( | |
| CAST( | |
| ST_MakePoint( | |
| "postinfo"."lon", | |
| "postinfo"."lat") AS geography(POINT, 4326)), | |
| "ranges"."range"+1, | |
| 8)::geometry AS geometry(POLYGON, 4326)) , CAST( | |
| st_buffer( | |
| CAST( | |
| ST_MakePoint( | |
| "postinfo"."lon", | |
| "postinfo"."lat") AS geography(POINT, 4326)), | |
| "ranges"."range", | |
| 8)::geometry AS geometry(POLYGON, 4326)) ) | |
| , | |
| -- create polygon (Tableau can't handle mixed geography types) | |
| ST_buffer( | |
| -- create point at distance from mission to create 'air' on dashboard | |
| ST_Project( | |
| CAST( | |
| ST_MakePoint( | |
| "postinfo"."lon", | |
| "postinfo"."lat") AS geography(POINT, 4326)), | |
| "ranges"."range" * | |
| 3, | |
| radians( | |
| 90.0))::geometry | |
| -- end st_project | |
| ,0.001) | |
| ]) | |
| AS geography(MultiPolygon, 4326)) |
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