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"Extinct cities Maps."
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Bio-Inspired Geocomputation for Cross-Scale Ecological Security Patterns in Urban Agglomerations: An Integrated Framework from Data Fusion to Network Optimization
Constructing resilient Ecological Security Patterns (ESPs) in polycentric urban agglomerations is computationally challenging due to persistent scale mismatches between local planning and regional strategies. To address this, we developed a novel Proactive Integration Mechanism (PIM), a computational framework that dynamically optimizes ESPs by algorithmically fusing multi-source geospatial data. The PIM integrates three innovative components: (1) a Function–Structure–Policy data fusion approach that couples Self-Organizing Map clustering of ecosystem services with Morphological Spatial Pattern Analysis and policy data to identify ecological sources; (2) a Dual-Feedback Mechanism that hybridizes circuit theory with an Improved Ant Colony Optimization algorithm for dynamic corridor delineation; and (3) complex network analysis to derive targeted interventions from topological properties. Applied to a node city of the Chengdu-Chongqing Economic Circle, the PIM identified 22 integrated ecological sources and 37 corridors. The optimized network showed enhanced resilience: a deterministic 20.5% increase in circuit redundancy (α-index) and an 8.6% improvement in overall connectivity (γ-index), achieved through minimal topological modifications. Temporal validation (2000–2020) confirmed the high stability of the identified patterns. This study provides a potentially replicable and computationally robust framework that bridges spatial ecology with optimization algorithms, offering a promising paradigm for constructing ESPs in node cities within subtropical urban agglomerations.
Journal Article
Spatial Orders in Maya Civic Plans
Ancient civic centers materialize ideas of proper spatial organization, among the Maya as in other societies. We argue that the position and arrangement of ancient Maya buildings and arenas emphatically express statements about cosmology and political order. At the same time, the clarity of original spatial expression is often blurred in the sites we observe archaeologically. Factors responsible for such blurring include multiple other influences on planning and spatial order, prominently the political life history of a civic center. Specifically, we argue here that centers with relatively short and simple political histories are relatively easy to interpret spatially. Those with longer development, but relatively little upheaval, manifest more elaborate but relatively robust and internally consistent plans. Sites with longer and more turbulent political histories, however, materialize a more complex cumulative mix of strategies and plausibly, therefore, of varying planning principles invoked by sequent ancient builders. We examine evidence for these assertions by reference to civic layouts at Copán, Xunantunich, Sayil, Seibal, and Tikal.
Journal Article
Vegetation type conversion in Los Peñasquitos Lagoon, California: An examination of the role of watershed urbanization
The objective of this study was to examine the role that watershed urbanization has played in changes to the vegetation types within Los Peñasquitos Lagoon, San Diego, California. Aerial photographs taken between 1928 and 1999 were used to examine changes in vegetation types. The aerial photographs were scanned into digital format and incorporated into a geographic information system (GIS). A combination of image classification techniques was used to differentiate the vegetation types. Land use/cover of the Carmel Valley watershed of the Los Peñasquitos Lagoon was mapped for the same dates as the aerial photographs. A temporal geographic analysis was conducted on the conversion of areal extent of lagoon vegetation types compared to areal extent of urban development in the watershed. Soil salinity and dry season (June-September) stream discharge were measured. The results show that approximately 80.3% of the vegetation in the study area has changed types between 1928 and 1999. Increases in the areal extent of urban development within the watershed show a strong positive relationship compared to the areal extent of brackish marsh and riparian vegetation, and a strong negative relationship to the areal extent of salt panne and mudflats. There was no significant relationship between urban development and salt marsh vegetation.Dry season stream discharge has increased by an order of magnitude. The increase in stream discharge supports the hypothesis that increased freshwater has lowered soil salinity, allowing for invasion by glycophytic species. Hydrology and soil salinity appear to be significant factors for maintaining the distribution of the lagoon vegetation types and the biotic communities that rely upon them.
Journal Article
The Topography of Symbol: Between Late Antique and Modern Jewish Understanding of Cities
This article explores the theological role of cities in Judaism as settings for the mediation between the heavenly and earthly realms. By way of juxtaposing the late antique city of Sepphoris and the modern settlement of Me'ah She'arim in Jerusalem, two understandings of this mediation will be studied dialectically. The differences and similarities between the two communities and their self-representation through urban architecture reveal the ways in which the highest religious symbols are manifested in the life of a city. They also unfold the transformation of modernity and the particular interpretation of a Jewish settlement it inspired.
Journal Article