Title

A virtual tile approach to raster-based calculations of large digital elevation models in a shared-memory system

Document Type

Article

Journal/Book Title/Conference

Computers & Geosciences

Volume

82

Publisher

Elsevier

Publication Date

9-1-2015

First Page

78

Last Page

88

DOI

10.1016/j.cageo.2015.05.014

Abstract

Grid digital elevation models (DEMs) are commonly used in hydrology to derive information related to topographically driven flow. Advances in technology for creating DEMs have increased their resolution and data size with the result that algorithms for processing them are frequently memory limited. This paper presents a new approach to the management of memory in the parallel solution of hydrologic terrain processing using a user-level virtual memory system for shared-memory multithreaded systems. The method includes tailored virtual memory management of raster-based calculations for datasets that are larger than available memory and a novel order-of-calculations approach to parallel hydrologic terrain analysis applications. The method is illustrated for the pit filling algorithm used first in most hydrologic terrain analysis workflows.

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