OHM at FOSS4G17

FOSS4G 2017 – 14-19 August 2017, Boston

OpenHistoryMapSilvia BernardoniMarco 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

• ArcheologicalData


Data digitization

“Measure with micrometer,Mark with chalk,Cut with axe”• Jim Fuller

Coarse

details

Level 0

Level 1Detailed

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

• Polygons of buildings• Landuses• Internal separations in buildings• Floors • Natural environment• Roads and rivers (infrastructure)

• Small local anthropic modifications


Data digitization

Medium zoom level = Medium detail


• Small local anthropic modificationstype wall

hypothetical yes

type drain

hypothetical no


Data digitization

Medium zoom level = High detail


• Small local anthropic modifications


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


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 OHMEMPIRE Community!

PAST


Thank you!Silvia Bernardoni - [email protected]

Raffaele Trojanis - [email protected] Montanari - [email protected]

OHM at FOSS4G17

Technology

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