Developing and applying the CARARE metadata schema for 3D documentation, presented by Andrea D’Andrea

Developing and applying the

CARARE metadata schema

for 3D documentation

Andrea D’Andrea, Università di Napoli “L'Orientale”

Digital Heritage 2013, Marseilles, 28 October 2013


Metadata and 3D content

Scientific data cannot be used correctly without information about what it means, how it was created and in which conditions Relevant to 3D given the range of – Instruments, methods and techniques – used in both data capture and data

processing, and – the different motivations and

rationales for 3D reconstructions

Pompeii, Italy


Benefits of Metadata

Metadata can store information about the life cycle of a 3D object – Field: keeps track of instrument settings, the condition of

the physical object being scanned and the objectives of the project

– Lab: keeps track of post processing of the data and provides a record of how evidence has been interpreted

– Access: supports discovery and use of the objects for education, tourism, research

– Preservation: supports long term preservation and allows for re-use of the data


Metadata: some context

The London Charter – Established principles for computer

visualisation CIDOC CRMdig – allows a simple and clear description

of the processes carried out to digitize and render a 3D model (3D COFORM)

CARARE – A harvesting schema for the

archaeological and architectural heritage supporting delivery of content to Europeana Pisa


Provenance

In 3D digitisation of cultural heritage objects provenance covers the technical processes whether this is: – Equipment chosen and the instrument settings – Light sources – Any obstacles to digitisation or sources of

noise/reflections – Software choices and settings – Techniques chosen for meshing, textures, decimation,

simplification, alignment etc.


Paradata

Provides information about the human processes of understanding and interpreting: – The evidence used to interpret an object and to create

a reconstruction – The methodology used in a research project

Paradata enables – Alternative interpretations or hypothesis to be

presented and linked to the supporting factual evidence

The principles are set out in the London Charter


3D ICONS approach

3D-ICONS needed to establish a metadata schema to: – support the provenance and paradata required

for quality assurance of 3D models, – take on board the recommendations in CIDOC

CRMdig; and to – Support delivery of metadata to Europeana

data model

CARARE Metadata Schema

Heritage asset

Digital

resources

Activities

Collection

4 themes

http://www.carare.eu/eng/Resources/CARARE-Documentation

Conceptually the CARARE record is focussed on a heritage asset and its relations to digital resources, activities and to collection information


The link to Digital Resource

• The Heritage Asset provides the description of the object itself

• The Digital Resource provides the link to the resource online

• You create a link between them by using the relation HasRepresentation

Heritage Asset

has Representation

Digital Resource

• One heritage asset can be related to another for example

• A 3D reconstruction (HA) isReplicaOf the physical remains (HA)

• One heritage asset can be related to another version of the same object

• A photorealistic 3D model (HA) DC:Relation to a 3D reconstruction (HA)

• One heritage asset can be related to an activity

• A 3D model (HA) WasDigitisedBy a Digitisation project (Act)

• An activity can be related to a digital resource

• A Digitisation project (ACT) HasCreated a 3D object(DR)

• One heritage asset can be related to many digital resources

The link to Digital Resource


CARARE and EDM

Europeana Data Model

EDM example

Provides an open cross-domain framework that accommodates community standards Is a semantic web approach that enables Linked Open Data


EDM

• Distinguishes “provided objects” - painting, book,

movie, etc. (edm:providedCHO) from

• digital representations of the object found online

(edm:webResource) and

• Groups these together to represent a logical whole

(ore:Aggregation)


Provided Cultural Heritage Object (CHO) and descriptive metadata


Web Resources – digital representations


Aggregations – Bundling it all together

Contextual Resources – e.g., Places

CARARE’s geospatial

enrichment represented with

EDM contextual resource

class


Mapping CARARE data to EDM

A CARARE object becomes one or several EDM Provided Cultural Heritage Objects with:

Related web resources

Aggregations

Contextual information about place


CARARE 2.0

Provides an update to the CARARE schema – Adds properties and elements to ensure compliance with 3D

ICONS requirements Extends the activities theme – Allows for different types of events (such as data acquisition,

post processing) – Adds an element to capture event methods – Allows for the general and specific purposes of events to be

distinguished – Allows for methods and techniques to be distinguished better – Adds relations between events to conform with CRMdig


CARARE 2.0 continued

Redefines the scope of the heritage asset class to include a wider range of cultural objects: – The class was limited to monuments, buildings, landscapes,

archaeological objects, ecofacts and shipwrecks – The scope now includes information sources such as books,

journal articles, maps, plans, drawings, photographs, movies and other born digital cultural objects such as 3D models

– General type element added to distinguish real world monuments from other cultural objects

The digital resources theme was simplified to remove duplication This simplifies the mapping to EDM

Ore:Aggregation

Edm: ProvidedCHO

Dc:Description (free text)

Edm:Information Resource

Acquisition Process

Edm: Event



Edm: Event


3DModel

Thumbnail given to Europeana

Edm: WebResources Edm: WebResources

Edm:HasLandingPage

Heritage Asset

Digital Resource

Edm:Was_Present_At CRMdig:L1B.was_digitized_by

Edm:Was_Present_At CRMdig:L20F.has created


Edm:HasView

Calibration

Documentation

Digitization Process File Calibration

Edm: Event


File Documentation

Edm: Event

21 Workshop on Metadata – Xanthi 27-28 June 2013

Ore:Aggregation

Edm: ProvidedCHO

Edm: Event Dc:Description (free text)


Acquisition Process

Edm:Was_Present_At

Edm: Event



Edm: Event


3DModel Thumbnail given to Europeana

Edm: WebResources

Edm: WebResources

Edm:HasLandingPage

Heritage Asset

Digital Resource

Edm:Was_Present_At CRMdig:L1B.was_digitized_by


Edm:HasView

Software Execution

Formal Derivation

22 Workshop on Metadata – Xanthi 27-28 June 2013


CARARE 2.0 implementation

http://3dicons-project.eu/eng/Media/Files/D6.1-Report-on-Metadata-Thesauri


Conclusions

Recording good quality metadata is important! Its beneficial for field researchers, visualisation

professionals and general users Paradata and provenance are important for use and re-

use of 3D models 3D ICONS has built on existing principles and schemas to

establish the CARARE 2.0 for 3D documentation and to supply data to Europeana

CARARE and 3D ICONS are helping confirm the relevance of richer data models for Europeana

Human supervision remains crucial for quality assurance!

Any questions?

Andrea D'Andrea [email protected]

This project has been funded with support from the European Commission‘s CIP ICT PSP programme

mailto:[email protected]

Developing and applying the CARARE metadata schema for 3D documentation, presented by Andrea D’Andrea

Technology

data digital heritage

europeana digital heritage

place digital heritage

architectural heritage

aggregationdigital heritage

togetherdigital heritage

edmdigital heritage

d objectdr