Add Query Function for Maps

In the Internet age, the search query is the basis of all user behavior, and map query is an essential function of online maps.

The core value of map query is to help users find valuable information. Query includes traditional SQL query and spatial query. SQL query is based on the attributes of spatial objects. Spatial query is based on spatial relations of geometric objects.

This chapter takes iClient for JavaScript as an example to introduce the using methods for query, including SQL query, distance query, bounds query, and spatial query.