LatLonKey Class Reference

A latitude/longitude key for 1x1 or 10x10 degree grid tiles. More...

#include <shapefile_basemap.h>

Public Member Functions
	LatLonKey (int lat, int lon)
	Constructor for creating a LatLonKey.
bool	operator< (const LatLonKey &k) const
bool	operator== (const LatLonKey &other) const

Public Attributes
int	lat
	Integer latitude value representing the northern (top) boundary of a latitude band.
int	lon
	Integer longitude value representing the western (left) boundary of a longitude band.

Detailed Description

A latitude/longitude key for 1x1 or 10x10 degree grid tiles.

Used for indexing geographical data in a grid-based system where each tile represents a 1x1 degree area. The lat/lon values represent the top-left corner of each grid tile. For example, a coordinate of (lat=45.7, lon=-120.3) would be in the tile with LatLonKey(45, -121).

The tiles are 1x1 degree, except the crude resolution which is 10x10 to minimize the number of polygons needed to draw the planetary scale basemap. This logic is inherited from the workflow used by the source dataset https://osmdata.openstreetmap.de/data/land-polygons.html

Definition at line 63 of file shapefile_basemap.h.

Constructor & Destructor Documentation

LatLonKey()

LatLonKey::LatLonKey ( int  lat, int  lon  )

inline

Constructor for creating a LatLonKey.

Parameters

lat	Integer latitude value indicating the north edge of latitude band.
lon	Integer longitude value indicating the west edge of a longitude band.

Definition at line 72 of file shapefile_basemap.h.

Member Function Documentation

operator<()

bool LatLonKey::operator< ( const LatLonKey &  k ) const

inline

Definition at line 89 of file shapefile_basemap.h.

operator==()

bool LatLonKey::operator== ( const LatLonKey &  other ) const

inline

Definition at line 96 of file shapefile_basemap.h.

Member Data Documentation

lat

int LatLonKey::lat

Integer latitude value representing the northern (top) boundary of a latitude band.

For example, lat=45 represents the area between 45°N and 44°N.

Definition at line 81 of file shapefile_basemap.h.

lon

int LatLonKey::lon

Integer longitude value representing the western (left) boundary of a longitude band.

For example, lon=-120 represents the area between 120°W and 119°W.

Definition at line 87 of file shapefile_basemap.h.

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The documentation for this class was generated from the following file:

• /home/runner/work/main/main/opencpn/gui/include/gui/shapefile_basemap.h