Our presentation at FOSS4G 2017

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

2. FOSS4G 2017 – 14-19 August 2017, Boston
What is OHM
What is OHM?
Hist’ry don’t hurt me
don’t hurt me
No more
OHM?

3. FOSS4G 2017 – 14-19 August 2017, Boston
What is OHM
Public/Participatory
Archaeology
Web GIS
Open Access«Best effort»
For the user by
the user

4. FOSS4G 2017 – 14-19 August 2017, Boston
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

5. FOSS4G 2017 – 14-19 August 2017, Boston
The OHM approach

6. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Points and Lines vs Polygons
• Points
• Lines
• Polygons
No physical evidence
Physical evidence
• Historical Data
• Archeological
Data

7. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
“Measure with micrometer,
Mark with chalk,
Cut with axe”
• Jim Fuller
Coarse
details
Level 0
Level 1
Detailed
world

8. FOSS4G 2017 – 14-19 August 2017, Boston
Digression

9. FOSS4G 2017 – 14-19 August 2017, Boston
Digression

10. FOSS4G 2017 – 14-19 August 2017, Boston
Digression

11. FOSS4G 2017 – 14-19 August 2017, Boston
Digression

12. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Marzabotto data as test for the system

13. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Low zoom level = less detail
• Polygons of buildings
• Landuses
• Natural environment
• Roads and rivers (infrastructure)

14. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Medium zoom level = Medium detail
• Polygons of buildings
• Landuses
• Internal separations in buildings
• Floors
• Natural environment
• Roads and rivers (infrastructure)
• Small local anthropic modifications

15. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Medium zoom level = Medium detail
• Polygons of buildings
• Landuses
• Internal separations in buildings
• Floors
• Natural environment
• Roads and rivers (infrastructure)
• Small local anthropic modificationstype wall
hypothetical yes
type drain
hypothetical no

16. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
Medium zoom level = High detail
• Polygons of buildings
• Landuses
• Internal separations in buildings
• Floors
• Natural environment
• Roads and rivers (infrastructure)
• Small local anthropic modifications

17. FOSS4G 2017 – 14-19 August 2017, Boston
Data digitization
High zoom level = High detail
• Polygons of buildings
• Internal separations in buildings
• Floors
• Roads and rivers (infrastructure)
• Small local anthropic modifications
• Components of walls, monuments,
roads, infrastructures

18. FOSS4G 2017 – 14-19 August 2017, Boston
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
source ardb.info/research/Govi201
0-42eeaf884
type research:time
valid:start -449
valid:end -400
source ardb.info/research/Govi201
0-42eeaf884

19. FOSS4G 2017 – 14-19 August 2017, Boston
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

20. FOSS4G 2017 – 14-19 August 2017, Boston
The source problem: Source Reliability

21. FOSS4G 2017 – 14-19 August 2017, Boston
Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
3 – Archival
4 – Bibliographical

22. FOSS4G 2017 – 14-19 August 2017, Boston
Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
•b Instrumental mapping
3 – Archival
4 – Bibliographical

23. FOSS4G 2017 – 14-19 August 2017, Boston
Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
•b Instrumental mapping
3 – Archival
•a Catalogue
•b Digital archive
4 – Bibliographical

24. FOSS4G 2017 – 14-19 August 2017, Boston
Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
•b Instrumental mapping
3 – Archival
•a Catalogue
•b Digital archive
4 – Bibliographical
•a Educational
•b Academic

25. FOSS4G 2017 – 14-19 August 2017, Boston
Source Reliability
1 - Direct
•a Oral
•b Mnemonic
2 – Survey
•a Direct drawing
•b Instrumental mapping
3 – Archival
•a Catalogue
•b Digital archive
4 – Bibliographical
•a Educational
•b Academic

26. FOSS4G 2017 – 14-19 August 2017, Boston
The OHM Technology

27. FOSS4G 2017 – 14-19 August 2017, Boston
The Platform
• Based on the OpenStreetMap technological stack
• Rails + PostGIS (+ LeafletJS)
• The OSM tools
• Osmosis
• JOSM
• ID Editor *
• Mapnik *
• Overpass API

28. FOSS4G 2017 – 14-19 August 2017, Boston
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

29. FOSS4G 2017 – 14-19 August 2017, Boston
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

30. FOSS4G 2017 – 14-19 August 2017, Boston
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

31. FOSS4G 2017 – 14-19 August 2017, Boston
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

32. FOSS4G 2017 – 14-19 August 2017, Boston
What else to say...

33. FOSS4G 2017 – 14-19 August 2017, Boston
What else to say...
You are all invited to join the OHM
EMPIRE Community!
PAST

34. FOSS4G 2017 – 14-19 August 2017, Boston
Thank you!
Silvia Bernardoni - silvia.bernardoni@openhistorymap.org
Raffaele Trojanis - r.trojanis@openhistorymap.org
Marco Montanari - marco.montanari@openhistorymap.org