公开(公告)号：US08675013B1

公开(公告)日：2014-03-18

申请号：US13162237

申请日：2011-06-16

Applicant: Marcin Romaszewicz ,  Gokul Varadhan ,  Emil Praun

Inventor： Marcin Romaszewicz ,  Gokul Varadhan ,  Emil Praun

IPC: G09G5/00

CPC classification number: G09G5/00 ,  G06T15/04 ,  G06T15/20 ,  G06T17/05 ,  G06T2210/12

Abstract: Embodiments render polygonal data in a geographical information systems according to a viewing perspective of a geographical information systems user. The user may define a viewing perspective. A bounding box may be determined that includes the area being viewed in the viewing perspective. A spherical coordinate to Cartesian coordinate matrix may be determined to approximately convert spherical coordinates of the polygonal data to Cartesian coordinates to be rendered by a graphics processor. The graphics processor may then render the polygonal data and bias detail towards the viewing perspective of the user.

Abstract translation: 实施例根据地理信息系统用户的观看透视图在地理信息系统中呈现多边形数据。 用户可以定义观看透视图。 可以确定包括在观看透视图中正在观看的区域的边界框。 可以确定对笛卡尔坐标矩阵的球面坐标以近似地将多边形数据的球面坐标转换为由图形处理器呈现的笛卡尔坐标。 然后，图形处理器可以渲染多边形数据，并向用户的观看视角偏置细节。

公开(公告)号：US08638330B1

公开(公告)日：2014-01-28

申请号：US12588812

申请日：2009-10-28

Applicant: Emil C. Praun ,  John Rohlf ,  Marcin Romaszewicz

Inventor： Emil C. Praun ,  John Rohlf ,  Marcin Romaszewicz

IPC: G06T17/20

CPC classification number: G06T17/05 ,  G06T1/00 ,  G06T17/205 ,  G06T2210/21

Abstract: Systems and methods for approximating terrain data representing a water surface are disclosed. A computer-based geographical information system for approximating terrain data representing a water surface is provided. The system includes a mesh simplifier and a surface inversion corrector. The mesh simplifier simplifies initial water surface and water bottom meshes. The surface inversion corrector corrects simplified water surface and/or water bottom meshes to avoid having a water bottom surface incorrectly appear above a corresponding water surface in a display view. In one example, the mesh simplifier simplifies the initial water surface mesh while accounting for water/land boundaries. The mesh simplifier also simplifies the initial water bottom mesh while accounting for geographic features and/or water/land boundaries. A computer-implemented method for approximating terrain data representing a water surface is provided. In further embodiments, systems and methods for altering tile information received at a client device are provided.

Abstract translation: 公开了用于近似表示水面的地形数据的系统和方法。 提供了一种用于近似表示水面的地形数据的基于计算机的地理信息系统。 该系统包括网格简化器和表面反演校正器。 网格简化程序简化了初始水面和水底网格。 表面反转校正器校正了简化的水面和/或水底网，以避免在显示视图中在相应的水面上方出现水底表面不正确地出现。 在一个示例中，网格简化程序简化了初始水面网格，同时考虑到水/土地边界。 网格简化也简化了初始水底网格，同时考虑了地理特征和/或水/土地边界。 提供了一种计算机实现的用于近似表示水面的地形数据的方法。 在另外的实施例中，提供了用于改变在客户端设备处接收的瓦片信息的系统和方法。