# GeoStore Spatial Filters Types

For the last couple of weeks, I’ve still been working on my research project of integrating spatial filters into RDF3X triple store. In particular, I’ve been working on the server side of the project, which takes queries from the client side, analyze and execute them, and return result back to the client. For my convenience of referencing the project, I decided to call it “GeoStore”, instead of “Spatial Function Triple Store Integration” (Ins’t that easier?).

The following are the spatial filters types I implement in the system and some descriptions.

Filter Name | Syntax Name | Args | Description |

Window | within | 5 | Filters results to a rectangular region |

Range | within | 4 | Filters results to within a distance from a point |

NearBy | nearby | 4 | Filters results to k nearest to a point |

## Window Filter

### Syntax

within(?var, xmin, ymin, xmax, ymax)

### Parameters

?var query variable to be filteredxminNumericx coordinate of lower-left corner of the rectangle

</tr>Param | Type | Description |

xmin | Numeric | x coordinate of lower-left corner of the rectangle |

ymin | Numeric | y coordinate of lower-left corner of the rectangle |

xmax | Numeric | x coordinate of upper-right corner of the rectangle |

ymax | Numeric | y coordinate of upper-right corner of the rectangle |

## Range Filter

### Syntax

within(?var, x, y, rangeMeters)

### Parameters

?var query variable to be filteredxNumericx coordinate of center

</tr>Param | Type | Description |

x | Numeric | x coordinate of center |

y | Numeric | y coordinate of center |

rangeMeters | Numeric | radius in meters |

## NearBy Filter

### Syntax

nearby(?var, x, y, limit)

### Parameters

?var query variable to be filteredxNumericx coordinate of point

Param | Type | Description |

x | Numeric | x coordinate of point |

y | Numeric | y coordinate of point |

limit | Integer | number of nearest records to return |