| 1 | /***************************************************************************** |
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| 2 | * Todd Hutchinson |
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| 3 | * WSI Corporation |
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| 4 | * Billerica, MA |
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| 5 | *****************************************************************************/ |
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| 6 | |
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| 7 | /* This header contains the public interface to the GridNav API. */ |
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| 8 | |
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| 9 | typedef struct { |
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| 10 | float central_lat; |
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| 11 | float central_lon; |
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| 12 | int map_proj; |
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| 13 | float truelat1; |
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| 14 | float truelat2; |
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| 15 | } Projection; |
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| 16 | |
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| 17 | typedef struct { |
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| 18 | int num_columns; |
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| 19 | int num_rows; |
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| 20 | float dx; |
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| 21 | float dy; |
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| 22 | float lat_origin; |
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| 23 | float lon_origin; |
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| 24 | float origin_column; |
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| 25 | float origin_row; |
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| 26 | } GridStruct; |
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| 27 | |
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| 28 | typedef struct { |
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| 29 | double parm1; |
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| 30 | double parm2; |
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| 31 | double parm3; |
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| 32 | double parm4; |
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| 33 | double parm5; |
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| 34 | double parm6; |
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| 35 | double parm7; |
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| 36 | } ProjTransform; |
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| 37 | |
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| 38 | typedef struct { |
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| 39 | Projection proj; |
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| 40 | GridStruct grid; |
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| 41 | ProjTransform proj_transform; |
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| 42 | } GridNav; |
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| 43 | |
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| 44 | |
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| 45 | /* Public Interface */ |
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| 46 | |
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| 47 | int GRID_init(float center_lat, float center_lon, int projection, |
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| 48 | float truelat1, float truelat2, int num_columns, |
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| 49 | int num_rows, float dx, float dy, float lat_origin, |
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| 50 | float lon_origin, float origin_column, float origin_row, |
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| 51 | GridNav *gridnav); |
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| 52 | int GRID_to_latlon(GridNav *gridnav, float column, float row, float *lat, |
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| 53 | float *lon); |
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| 54 | int GRID_from_latlon(GridNav *gridnav, float lat, float lon, float *column, |
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| 55 | float *row); |
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| 56 | int GRID_rotate_from_earth_coords(GridNav *gridnav, float lon, float u_earth, |
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| 57 | float v_earth, float *u_grid, float *v_grid); |
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| 58 | int GRID_rotate_to_earth_coords(GridNav *gridnav, float lon, float u_grid, |
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| 59 | float v_grid, float *u_earth, float *v_earth); |
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| 60 | |
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| 61 | #define GRID_LATLON 0 |
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| 62 | #define GRID_MERCATOR 1 |
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| 63 | #define GRID_LAMCON 3 |
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| 64 | #define GRID_POLSTR 5 |
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