get_state¶

process_ais_data.
get_state
(cur_lon, cur_lat, grid_params)¶ Discretizes a coordinate pair into its state space representation in a Euclidean grid.
Takes in a coordinate pair
cur_lon
,cur_lat
and grid parameters to calculate the integer state representing the given coordinate pair. This coordinate grid is always rowmajor.(min_lon, min_lat)
represent the bottomleft corner of the grid.Example
A 3 x 4 grid would have the following state enumeration pattern:
8 9 10 11 4 5 6 7 0 1 2 3
With each grid square’s area bounded in the following way:
(min_lon, min_lat + grid_len) (min_lon + grid_len, min_lat + grid_len)  (min_lon, min_lat)  (min_lon + grid_len, min_lon)
In this example, the bottom left of state 0’s boundaries would be the point
min_lon, min_lat
, and the total area mapping to state 0 would be the square withmin_lon, min_lat
as the bottom left corner and each side of the square with lengthgrid_len
. The inclusive parts of the square’s boundaries mapping to zero are solid lines. Parameters
cur_lon (float) – The longitude of the data point.
cur_lat (float) – The latitude of the data point.
grid_params (dict) – The grid parameters specified in the
config_file
.
 Returns
A state corresponding to the discretized representation of
cur_lon
,cur_lat
. Return type
int