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23-019 document update #183
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Image files for graphics go here. Image files for figures go in the "figures" directory. Only place in here images not used in figures (e.g., as parts of tables, as logos, etc.) | ||
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Each graphic is a separate file with the naming convention: | ||
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"GRPn.xxx" where "n" is a sequential number with leading zeroes appropriate for the total number of graphics and "xxx" is the appropriate extension for the file type. |
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metanorma: | ||
source: | ||
files: | ||
- 23-019.adoc | ||
- document.adoc | ||
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[[overview1]] | ||
[obligation=informative] | ||
== SensorThings API overview | ||
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Clauses not Containing Normative Material | ||
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[[who-should-use]] | ||
=== Who should use the OGC SensorThings API | ||
Paragraph | ||
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Organizations that need web-based platforms to manage, store, share, and analyze IoT-based sensor observation data should use the OGC SensorThings API. | ||
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A Thing also can have multiple Datastreams. | ||
A Datastream is a collection of Observations grouped by the same ObservedProperty, Sensor and optionally by Feature and ObservingProcedure. | ||
An Observation is an event performed by a Sensor that produces a result whose value is an estimate of an ObservedProperty of any given Feature which may be a proximate or ultimate FeatureofInterest. | ||
Details of each above described entity are provided in <<sensing-entities1>>. | ||
Details of each above described entity are provided in <<sensing-core>>. | ||
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The Sampling part is a new addition to the SensorThings API. | ||
As is often the case, an Observation may not be a true representation of the intended Feature's Property that an Observer may be trying to Observe. | ||
Sampling is a common strategy to understand the characteristics of an otherwise difficult-to-measure Property of any feature-of-interest. | ||
In order to generate Samplings, a Sampler, that may be any physical device or even a human being part of a survey campaign, must carefully select a SamplingProcedure. | ||
Samplings may be generated by a sequence of SamplingProcedures (and vice-versa), however a Sampler must employ a unique SamplingProcedure to maintain unique Sampling-Sampler-SamplingProcedure relationships. | ||
In scenarios where a Feature is not directly available for Sampling, a PreparationProcedure composed of multiple PreparationSteps may optionally be used to generate a PreparedFeature. | ||
In order to generate Samplings, a Sampler, that may be any physical device (or even a human being part of a survey campaign), must carefully select a SamplingProcedure. | ||
A Sampling may be generated by a SamplingProcedure. | ||
This SamplingProcedure can be used by multiple Samplers and conversely, a Sampler may implement multiple SamplingProcedures. | ||
However, any Sampling that is generated by a Sampler is always associated with a unique SamplingProcedure. | ||
In scenarios where a Feature is not directly available for Sampling, a PreparationProcedure composed of multiple PreparationSteps may optionally be used to generate a PreparedSample (Feature entity). | ||
The entities are explained in detail in <<sampling-entities>>. | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more.
What does that mean? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. It means when a Feature is basically a prepared Feature (or Sample). For example, in case of water quality monitoring, it is not feasible to have the entire River Feature available to observe, a PreparationProcedure is applied to get a sample of water There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. No, preparation procedures are not used to create a sample. Sampling procedures create samples. Preparation procedures are applied to samples to prepare them for measuring, or to conserve them like with specimens. |
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The Tasking part provides a standard way for parameterizing - also called tasking - of taskable IoT devices, such as individual sensors and actuators, composite consumer / commercial / industrial / smart cities in-situ platforms, mobile and wearable devices, or even unmanned systems platforms such as drones, satellites, connected and autonomous vehicles, etc. | ||
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The Tasking Data Model thus mirrors the Sensing Data Model. | ||
Each of these entities are elaborated further in <<tasking-entities>>. | ||
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The <<sensing-entities-om-extn>> and <<relations-extension>> are optional extensions to the data model that may be used for extended data modelling requirements. | ||
The <<sensing-OM-extension>> and <<relations-extension>> are optional extensions to the data model that may be used for extended data modelling requirements. | ||
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[[observations-measurements]] | ||
=== SensorThings API and Relation to ISO/OGC Observations, Measurements and Samples | ||
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[[revision-differences]] | ||
=== SensorThings API 2.0 changes from 1.1 | ||
[#sta-changes,reftext='{table-caption} {counter:table-num}'] | ||
.Changes in the SensorThings API 2.0 data model compared to v1.x | ||
.Changes in the SensorThings API 2.0 data model compared to v1.1 | ||
[width="100%",cols="5,20a",options="header"] | ||
|==== | ||
| *Entity* | *Changes* | ||
| Sensor | description attribute is now optional and not mandatory | ||
| Thing | description attribute is now optional and not mandatory | ||
| Location | description attribute is now optional and not mandatory | ||
| Location | | ||
- description attribute is now optional and not mandatory | ||
- For a Thing having multiple Locations, these Locations MAY be in same encodingTypes OR the encodingTypes MAY be be in different spaces (e.g., one encodingType in Geometrical space and one encodingType in Topological space). | ||
| Datastream | | ||
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- description attribute is now optional and not mandatory | ||
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=== Relation to OASIS-OData | ||
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The OGC SensorThings API v2 interface is not an OData interface. | ||
The OGC SensorThings API v2 interface is not an OData interface and does not claim to be an OData service. | ||
It specifies a subset of the OData interface, and extends it at the same time. | ||
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An SensorThings API Server implementation can implement the full OData specification. | ||
An OData client can access a SensorThings API service. | ||
An SensorThings API Server implementation can implement the full OData specification. An OData client can access a SensorThings API service. | ||
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EDITOR: Check if this is true |
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:sectnums: |,all| | ||
:sectanchors: | ||
[[sensing-OM-extension]] | ||
=== Sensing Extension (Observations & Measurements) | ||
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That heading should not have been removed.