1.4 KiB
INTRODUCTION
CartoDB uses a number of custom PLpgSQL functions to perform a few magical things. Those functions are accessible to users on CartoDB as well, so we would like to document what they are and what they do here.
Spatial functions
CDB_HexagonGrid - create hexagonal grid from extent and size
CDB_MakeHexagon - make a hexagon with given center and side
CDB_RectangleGrid - fill given extent with a rectangular coverage
Tile based
CDB_XYZ_Extent - Find the extent of a tile by XYZ
CDB_XYZ_Resolution - Find the pixel resolution of tiles
CDB_TransformToWebmercator - Convert a geometry to valid webmercator
Statistical functions
CDB_JenksBins - Find breaks in an array of numbers using Jenks method
CDB_HeadsTailsBins - Find breaks in an array of numbers using Heads/Tails method
CDB_QuantileBins - Find quantile breaks in an array of numbers
System functions
CDB_UserTables - Get a list of all tables in your account
CDB_SetUserQuotaInBytes - Set maximum user quota in bytes
column names - now returned in JSON response
column types - now returned in JSON response