Geographic Information Science: 9th International by Jennifer A. Miller, David O'Sullivan, Nancy Wiegand PDF

By Jennifer A. Miller, David O'Sullivan, Nancy Wiegand

ISBN-10: 3319457373

ISBN-13: 9783319457376

ISBN-10: 3319457381

ISBN-13: 9783319457383

This ebook constitutes the refereed complaints of the ninth foreign convention on Geographic info technological know-how, GIScience 2016, held in Montreal, quality controls, Canada, in September 2016. The 21 complete papers provided have been rigorously reviewed and chosen from sixty three submissions. The papers are geared up in topical sections similar to spatial algorithms; community research; spatial research; spatial equipment; user-generated info and associated information; computerized cartography and geovisualization.

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Extra resources for Geographic Information Science: 9th International Conference, GIScience 2016, Montreal, QC, Canada, September 27-30, 2016, Proceedings

Sample text

In this definition, control points are observed or measured locations in space and time, and segments connect temporally adjacent control points. A space-time prism (see Fig. 1b) may exist between any pair of temporally adjacent control points, creating a time interval during which unrecorded (or future) travel may occur. An object may thus occupy locations in space other than the straight-line segment between two adjacent control points. The outline of the prism represents the limits of the locations that can be visited, as defined by the known space-time control points, and the object’s maximum velocity, vmax , which defines the prism’s diameter.

The lemma readily follows. Lemma 3. The computed partial assignments correspond to Definition 1. Proof. We prove this lemma via structural induction. In the base case, e is a leaf of T . Hence, it is an edge of P and the only partial role assignment is αeself with size zero (since e is not in C). Trivially, this has minimal size. In the inductive case, e is not a leaf of T . It has two children, e1 and e2 . Let βe be an optimal partial assignment, according to Definition 1. It implies partial β (e ) assignments βe1 and βe2 for its two subtrees.

We denote by GS = (V, E∪S) the graph obtained by augmenting G with the candidate edges in S. We call a candidate edge {u, v} ∈ C satisfied with respect to S if ΔGS (u, v) ≤ τ . A simple path in GS whose length is sufficiently small to prove that ΔGS (u, v) ≤ τ is called a witness of {u, v}. Set S is a solution to the problem if all edges in C are satisfied (with respect to S). Note that we ask to satisfy only the pairs specified by the candidate edges; we do not guarantee that the dilation between all vertices is bounded by τ .

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Geographic Information Science: 9th International Conference, GIScience 2016, Montreal, QC, Canada, September 27-30, 2016, Proceedings by Jennifer A. Miller, David O'Sullivan, Nancy Wiegand

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