Invention Grant
- Patent Title: Scalable and efficient cutting of map tiles
- Patent Title (中): 可扩展和高效地切割地图瓦片
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Application No.: US13632004Application Date: 2012-09-30
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Publication No.: US09395193B2Publication Date: 2016-07-19
- Inventor: Guillaume A. Carbonneau , Vincent Dumont , Anuj Dhamija , Denis Laprise , Okan Arikan , James A. Howard
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Adeli LLP
- Main IPC: G06T11/20
- IPC: G06T11/20 ; G01C21/32 ; G06T11/00

Abstract:
A process is provided that reduces the amount of data for a map tile that could not be displayed separately on the scale of that tile. The process generates an equivalent of the road data by rasterizing the vectors representing road segments lying within a tile and generating a connectivity mask that keeps track of which pixels are connected to which other pixels along the vectors. The process constructs an undirected graph. Each “on” pixel of the undirected graph represents a vertex and the vertices are connected by edges generated from the connectivity graph, but without a set direction. The process traces the undirected graph to generate chains of connected road segments and takes the chains and simplifies them in order to reduce the amount of data that must be stored and transmitted for the tile in order to produce all the visible roads of the tile at that scale.
Public/Granted literature
- US20130328879A1 Scalable and Efficient Cutting of Map Tiles Public/Granted day:2013-12-12
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