OHM at FOSS4G17

FOSS4G 2017 – 14-19 August 2017, Boston
OpenHistoryMap
Silvia Bernardoni
Marco Montanari
Raffaele Trojanis

What is OHM
What is OHM?
Hist’ry don’t hurt me
don’t hurt me
No more
OHM?

What is OHM
Public/Participatory
Archaeology
Web GIS
Open Access«Best effort»
For the user by
the user

Assumptions
• Beyond the physical elements, everything else is interpretation
• Each interpretation is bound to a specific research
• Each research needs to be traceable
Starting from these assumptions, each discussion needs to be in part about
the ontology and in part about the digitization, requiring the
differentiation of data from a physical and interpretative point of view

The OHM approach

Data digitization
Points and Lines vs Polygons
• Points
• Lines
• Polygons
No physical evidence
Physical evidence
• Historical Data
• Archeological
Data

Data digitization
“Measure with micrometer,
Mark with chalk,
Cut with axe”
• Jim Fuller
Coarse
details
Level 0
Level 1
Detailed
world

Digression

Data digitization
Marzabotto data as test for the system

Data digitization
Low zoom level = less detail
• Polygons of buildings
• Landuses
• Natural environment
• Roads and rivers (infrastructure)

Data digitization
Medium zoom level = Medium detail
• Landuses
• Internal separations in buildings
• Floors
• Small local anthropic modifications

Data digitization
Medium zoom level = Medium detail
• Landuses
• Floors
• Small local anthropic modificationstype wall
hypothetical yes
type drain
hypothetical no

Data digitization
Medium zoom level = High detail
• Landuses
• Floors

Data digitization
High zoom level = High detail
• Floors
• Components of walls, monuments,
roads, infrastructures

Data digitization
The fourth dimension
type research:time
valid:start -525
valid:end -475
source ardb.info/research/Govi201
0-42eeaf884
type research:time
valid:start -474
valid:end -450
0-42eeaf884
type research:time
valid:start -449
valid:end -400
0-42eeaf884

Research Ontology
• The research is the tip of the iceberg
• Each research is a collection set of interpretations
• Each interpretation is a collection of physical elements and a set of shared
attributes
• Each attribute defines a specific way of looking at the data
• The definition of Research Ontology implies
• Source quality definition
• Open Access enabling

The source problem: Source Reliability

Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
3 – Archival
4 – Bibliographical

Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
•b Instrumental mapping
3 – Archival

Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
3 – Archival
•a Catalogue
•b Digital archive

Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
3 – Archival
•a Catalogue
•b Digital archive
•a Educational
•b Academic

The OHM Technology

The Platform
• Based on the OpenStreetMap technological stack
• Rails + PostGIS (+ LeafletJS)
• The OSM tools
• Osmosis
• JOSM
• ID Editor *
• Mapnik *
• Overpass API

Our additions to the stack
• Tiler
• * ID Editor customization
• * Mapnik customization
• TimeTravelToolbar
• ARDb.info (Archaeological Research Database)
• A point of view on the research ontology
• ASDb project

Our additions to the stack - Tiler
• Tiler enables easy digitization
of paper maps
• It exposes the characteristics
of a specific map (zoom
levels, resolution)
https://github.com/openhistorymap/tyler

Our additions to the stack - T3
TimeTravelToolbar
• Integrates with LeafletJS
• Already Angular2 ready
• Adds time-based features to the classic Tile Server URLs by adding a
time suffix to the filename.
• /{z}/{y}/{-x}.png tile url ⇒ /{z}/{y}/{-x}-{t}.png

Our additions to the stack - ARDb
• Another point of view on the OHM Research Ontology
• create an entrypoint and URI manager for the researches and
• track the research ids source of the operations in OHM
• Enables a better interpretation of research information
• Context
• History
• Relationships between research teams

What else to say...

What else to say...
You are all invited to join the OHM
EMPIRE Community!
PAST

Thank you!
Silvia Bernardoni - silvia.bernardoni@openhistorymap.org
Raffaele Trojanis - r.trojanis@openhistorymap.org
Marco Montanari - marco.montanari@openhistorymap.org

OHM at FOSS4G17

OHM at FOSS4G17

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