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3.2.1.2 Scope

The node meta‐model defines the sharing metadata for node resources in the comprehensive smart
cities management. The metadata content is confined to the unified description for inherent
properties, capabilities, and status and space‐time information of the nodes. The structure, physical
characteristics of the nodes themselves, as well as node observation data and the following
processing and services are all excluded.

The meta‐model can be applied in the integrated discovery and sharing, integrated management,
planning, dispatching, as well as collaborative observing for all kinds of nodes. The specific
application scope of the node meta‐model is given in Figure 13.

Unified encoding and sharing
for node resources
Publishing and service Efficient discovery and
for node resources access for node resources

Heterogeneous smart city nodes
sharing metadata
Sensing Space Processing Nodes Application Nodes
Nodes -borne

Data Fusion Atmospheric
Airborne Disaster
Hydrologi-
Ground-based cal
Data Computation
Collaborative Observation Integrated management
for node resources for node management
Dispatching and planing
for node resources

Figure 13 – Application scope for node meta‐model

3.2.1.3 Content
Based on the node description components and different metadata requirements from all kinds of
nodes, the node metadata is organized into the general information description framework, with
five components, including the sensor tag, performance, state, service and accessibility, and a nine‐
tuple structure [b‐ISO 19115‐2]. The node meta‐model is shown as follows:
Node metadata = {Identification, Characteristics, Capability, Quality, Space‐time, Working, Service,
Administration, Constraint}.

Among all the meta‐model components, identification and characteristics information are
tessellations for sensor tag component, capability and quality information for performance, service
information for service, and administration and constraint for accessibility. The relationship
between the five components and the nine‐tuple structure is demonstrated in Figure 14 [b‐Chenh].

ITU‐T's Technical Reports and Specifications 667