Constructing valid spatial processes on the sphere using kernel convolutions

2014 ◽  
Vol 25 (1) ◽  
pp. 2-15 ◽  
Author(s):  
M.J. Heaton ◽  
M. Katzfuss ◽  
C. Berrett ◽  
D.W. Nychka
Keyword(s):  
Spatial Processes

scholarly journals The logistics of police power: Armored vehicles, colonial boomerangs, and strategies of circulation

2020 ◽  
Vol 38 (6) ◽  
pp. 1138-1156
Author(s):  
Derek S Denman
Keyword(s):  
Urban Space ◽  
Material Composition ◽  
Critical Reading ◽  
Spatial Processes ◽  
Police Power ◽  
Defense Logistics Agency ◽  
Armored Vehicles ◽  
Armored Vehicle ◽  
Colonial Warfare

Images of police armored vehicles in Ferguson and Baltimore have been influential in a public conversation about the militarization of the police. However, recent critical and abolitionist work on policing rejects the concept of “militarization” for obscuring the longstanding histories and institutional connections between military and police apparatuses. By following the transfers of armored vehicles to police, this article illuminates the logistical pathways that connect colonial warfare and domestic policing, adding an account of the material composition of police power to the historical work of critical and abolitionist thinkers. The article proceeds through a critical reading of records of the Defense Logistics Agency, tracking the transfer of surplus armored vehicles to the police. Designated as “high-visibility property” by the Defense Logistics Agency, these vehicles testify to the materiality of police power. The article then tracks the visibility and materiality of these vehicles as they are deployed in urban and suburban spaces and considers their unique capacity to suppress the democratic energies of crowds. Tracking the armored vehicle provides a way to ask how the rigid lines of fortified urban space are organized into mobile vectors and where ongoing processes of colonization enter these spatial processes.

scholarly journals Environmental filtering and spatial processes in urban riparian forests

2016 ◽  
Vol 27 (5) ◽  
pp. 1023-1035 ◽  
Author(s):  
Marie-Hélène Brice ◽  
Stéphanie Pellerin ◽  
Monique Poulin
Keyword(s):  
Environmental Filtering ◽  
Riparian Forests ◽  
Spatial Processes

Social Areas in Cities, Volume 1: Spatial Processes and Form.

1978 ◽  
Vol 7 (2) ◽  
pp. 230
Author(s):  
Isaac W. Eberstein ◽  
D. T. Herbert ◽  
R. J. Johnston
Keyword(s):  
Spatial Processes

Spatial Processes, Models and Applications

Biometrics ◽  
1982 ◽  
Vol 38 (1) ◽  
pp. 287 ◽  
Author(s):  
Eric Renshaw ◽  
A. D. Cliff ◽  
J. K. Ord
Keyword(s):  
Spatial Processes

scholarly journals The geographic mosaic of coevolution in mutualistic networks

2018 ◽  
Vol 115 (47) ◽  
pp. 12017-12022 ◽  
Author(s):  
Lucas P. Medeiros ◽  
Guilherme Garcia ◽  
John N. Thompson ◽  
Paulo R. Guimarães
Keyword(s):  
Gene Flow ◽  
Species Interactions ◽  
Analytical Approximation ◽  
Spatial Processes ◽  
Geographic Mosaic ◽  
Generalist Species ◽  
Interacting Species ◽  
Adaptive Landscapes ◽  
Surprising Effect ◽  
Mutualistic Networks

Ecological interactions shape adaptations through coevolution not only between pairs of species but also through entire multispecies assemblages. Local coevolution can then be further altered through spatial processes that have been formally partitioned in the geographic mosaic theory of coevolution. A major current challenge is to understand the spatial patterns of coadaptation that emerge across ecosystems through the interplay between gene flow and selection in networks of interacting species. Here, we combine a coevolutionary model, network theory, and empirical information on species interactions to investigate how gene flow and geographical variation in selection affect trait patterns in mutualistic networks. We show that gene flow has the surprising effect of favoring trait matching, especially among generalist species in species-rich networks typical of pollination and seed dispersal interactions. Using an analytical approximation of our model, we demonstrate that gene flow promotes trait matching by making the adaptive landscapes of different species more similar to each other. We use this result to show that the progressive loss of gene flow associated with habitat fragmentation may undermine coadaptation in mutualisms. Our results therefore provide predictions of how spatial processes shape the evolution of species-rich interactions and how the widespread fragmentation of natural landscapes may modify the coevolutionary process.

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