The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2019
Filed:
Aug. 08, 2018
Mapbox, Inc., San Francisco, CA (US);
Konstantin Friedrich Käfer, Berlin, DE;
Ansis Brammanis, Toronto, CA;
Mapbox, Inc., San Francisco, CA (US);
Abstract
Techniques are described for efficiently generating terrain openness involve a digital elevation model comprising a texture representing a first geographic area and at least part of a plurality of mipmap levels representing geographic areas bordering the first geographic area. The texture and mipmap levels include pixels encoding elevation values for locations of geographic areas. For each pixel of the texture, derivatives are determined, as well as an openness factor based at least in part on the elevations at one or more pixels of the mipmap levels. The derivatives and openness factor are added to the texture. A hill shading factor is determined for each pixel based at least in part on the derivatives. An electronic map of the first geographic area is rendered using the openness and hill shading factors of each pixel of the texture. The rendering is sent for display.