846 B
846 B
Gravity Model
CDB_Gravity()
The Gravity Model is derived from newtons law of gravity and is used to estimate the degree of interaction between two places
Arguments
| Name | Type | Description |
|---|---|---|
| t_id | bigint[] | |
| t_geom | geometry[] | |
| t_weight | numeric[] | |
| s_id | bigint[] | |
| s_geom | geometry[] | |
| s_pop | numeric[] | |
| target | bigint | |
| radius | integer | |
| minval | numeric |
Returns
| Column Name | Type | Description |
|---|---|---|
| the_geom | Numeric | |
| source_id | bigint | |
| target_id | bigint | |
| dist | Numeric | |
| n | Numeric | |
| hpop | NUMERIC |
Example Usage
SELECT CDB_GRAVITY ();