Detailed tender specification clauses

Smart-city climatology for digital twins and CFD inputs

Use these clauses when the sensor network must feed urban digital twins, CFD models, microclimate studies, or planning dashboards.

copy into tender docsadapt to local climateverify with acceptance tests

Specification clauses

Use these as starting clauses. Replace bracketed values with project-specific values, legal terms, and reviewed performance thresholds before formal procurement.

Clause 1

Model-use declaration

The supplier shall define how each station supports the stated digital-twin, CFD, GIS, or dashboard workflow, including whether the data will be used as boundary conditions, calibration observations, validation evidence, operational monitoring, or public reporting.

Bidder evidence:
Model-use matrix showing each variable, station type, intended modelling use, averaging interval, units, and metadata fields.

Acceptance check:
Buyer verifies that every proposed measurement has a declared modelling or decision-support purpose.

Clause 2

Core meteorological variables

The system shall measure air temperature, relative humidity, barometric pressure, wind speed, wind direction, and solar radiation where required by the modelling scope. Optional variables such as surface temperature, rainfall, air quality, and noise shall be listed separately.

Bidder evidence:
Datasheets, measurement ranges, stated accuracy, response time, calibration method, and operating limits for each variable.

Acceptance check:
Factory documentation and site acceptance readings confirm each variable is present, timestamped, and exported in the required units.

Clause 3

Siting and representativeness metadata

Each monitoring point shall include coordinates, elevation, sensor height, mounting type, surrounding land-cover class, nearby obstructions, surface context, sky-view or shading notes, and photographs in at least four directions.

Bidder evidence:
Site metadata file, installation drawings, photographs, map layer, and obstruction notes.

Acceptance check:
Buyer audits a sample of installed stations against the submitted metadata and photographs.

Clause 4

Radiation shielding and ventilation

Air-temperature and humidity measurements shall use radiation shielding or aspiration appropriate for the exposure class, expected solar load, ventilation condition, and maintenance capacity of the site.

Bidder evidence:
Shield/aspiration description, manufacturer documentation, maintenance interval, cleaning method, and expected error under low-wind/high-radiation conditions.

Acceptance check:
Site inspection confirms shield installation, height, orientation, cleanliness, airflow path, and absence of avoidable local heat bias.

Clause 5

Wind measurement exposure

Wind sensors shall be installed at the specified height and exposure class for the intended use. The supplier shall state whether measurements represent street-canyon flow, rooftop flow, open terrain, pedestrian comfort, or CFD validation.

Bidder evidence:
Mounting height, boom length, obstruction diagram, local roughness notes, photographs, and variable averaging period.

Acceptance check:
Buyer verifies height, obstruction notes, data interval, and whether the wind measurement is suitable for the declared use.

Clause 6

Time synchronization and averaging

All measurements shall use synchronized timestamps, stated time zones, and documented averaging periods. Raw, averaged, and flagged values shall be distinguishable in the data output.

Bidder evidence:
Sample files showing timestamp format, interval, averaging method, time zone, QA flags, and missing-data representation.

Acceptance check:
Buyer imports sample files into the target digital-twin, GIS, CFD, or analytics workflow and confirms correct interpretation.

Clause 7

Digital-twin and CFD data delivery

The system shall provide machine-readable data exports suitable for digital-twin, CFD, GIS, and dashboard integration, including open file formats or API access, documented units, metadata, and versioned schema.

Bidder evidence:
API documentation, schema, sample CSV/JSON files, metadata dictionary, authentication method, and data ownership statement.

Acceptance check:
Buyer successfully retrieves recent data and metadata through the specified export method and validates required fields.

Clause 8

Calibration and uncertainty statement

The supplier shall provide calibration traceability and an uncertainty statement for each measurement variable, including expected sources of error from siting, exposure, shielding, drift, and maintenance conditions.

Bidder evidence:
Calibration certificates, uncertainty statement, calibration interval, drift expectations, field-check procedure, and maintenance schedule.

Acceptance check:
Buyer verifies certificate dates, sensor serial numbers, calibration chain, and procedure for future recalibration or replacement.

Clause 9

Pilot validation dataset

Before final acceptance, the supplier shall deliver a pilot dataset suitable for model calibration or validation, including timestamps, variables, metadata, QA flags, and known maintenance or outage events.

Bidder evidence:
Pilot dataset covering the agreed period, with data dictionary and notes on anomalies, outages, and QA/QC flags.

Acceptance check:
Buyer tests the dataset in the intended modelling or dashboard workflow and records gaps, timestamp errors, metadata issues, and usability defects.