Skip to content

Class astrea::trace::SpatialIndex

ClassList > astrea > trace > SpatialIndex

Spatial index for efficient ground point queries. More...

  • #include <SpatialIndex.hpp>

Public Functions

Type Name
SpatialIndex (const Angle & binSize=10.0 *mp_units::angular::unit_symbols::deg)
Construct spatial index with specified bin size.
void add_ground_point (std::size_t groundPointIdx, const Angle & lat, const Angle & lon)
Add a ground point to the index.
void clear ()
Clear all ground points from the index.
std::vector< std::size_t > get_all_ground_points () const
Get all ground point indices.
std::unordered_set< std::size_t > get_nearby_ground_points (const Angle & lat, const Angle & lon, const Angle & radius) const
Get ground points within a radius of a lat/lon position.

Detailed Description

Divides the Earth's surface into geographic bins to quickly find which ground points are near a satellite's subsatellite point

Public Functions Documentation

function SpatialIndex

Construct spatial index with specified bin size. 

astrea::trace::SpatialIndex::SpatialIndex (
    const Angle & binSize=10.0 *mp_units::angular::unit_symbols::deg
)

Parameters:

  • binSize Angular size of each bin (smaller = more bins, finer resolution)

function add_ground_point

Add a ground point to the index. 

void astrea::trace::SpatialIndex::add_ground_point (
    std::size_t groundPointIdx,
    const Angle & lat,
    const Angle & lon
)

Parameters:

  • groundPointIdx Index of the ground point being added (used for lookup)
  • lat Latitude of the ground point
  • lon Longitude of the ground point

function clear

Clear all ground points from the index. 

void astrea::trace::SpatialIndex::clear ()

function get_all_ground_points

Get all ground point indices. 

std::vector< std::size_t > astrea::trace::SpatialIndex::get_all_ground_points () const

Returns:

std::vector<std::size_t> Vector of all ground point indices in the index

function get_nearby_ground_points

Get ground points within a radius of a lat/lon position. 

std::unordered_set< std::size_t > astrea::trace::SpatialIndex::get_nearby_ground_points (
    const Angle & lat,
    const Angle & lon,
    const Angle & radius
) const

Parameters:

  • lat Latitude of center point
  • lon Longitude of center point
  • radius Angular radius to search

Returns:

Set of ground point indices within radius

The documentation for this class was generated from the following file astrea/trace/trace/analysis/SpatialIndex.hpp