Crowdsourced Georeferencing of Old Maps.

Transcription

1 Crowdsourced Georeferencing of Old Maps Rafael Roset

2 2 La Cartoteca de Catalunya The Cartoteca de Catalunya (map library) is part of the Institut Cartogràfic de Catalunya (national mapping agency, established in 1982), and started its activities in Number of items as of December 2011: Maps (sheets) Books and atlases Magazines Photographs Aerial photographs Instruments 220

3 3 Maps served in 2011 Cartoteca Digital (digital map library) Reading room Visits: Internal users: 266 Unique users: External users: 204 Average visit duration: 05:53 min Phone and Items downloaded: Loans: Size: 280 GB Use permits: 204

4 4 Digital map library 36,000+ documents freely downloadable at high resolution (150 ppi / 300 pp) ppi) 27collections On CONTENTdm 6.1.2

5 5 Maps for landing pages Map created with metadata loaded in Google Fusion Tables. Really easy to achieve compelling results Base map replaced with the TileCache of the ICC (local maps) ICC/Mapes-fotos-aeries/Cartografia- aeries/cartografia al-vostre-web/cartografia-icc-a- Google-Maps

6 6 Maps for landing pages Another example of a Fusion Tables constructed map. In this example the aspect has been altered using FusionTables Layer Wizard.

7 Catalogs outside libraries Aggregators 7

8 8 Geocatalogs SDI (Spatial Data Infrastructure)

9 9 Georeferencing: from map to supermap Original paper map hanging on a wall like a painting. Digitized map: RGB TIFF image at 300 ppi A 594 MB baseball card Georeferenced digital map superimposed on top of Google Earth Digitization turns a paper map into an image. The georeferencing process assigns coordinates to the image which becomes a supermap

10 10 Georeferencer pilot at the Cartoteca Selected documents from specific collections were choosen, both maps and old aerial images.

11 11 Klokan Technologies The software lives in the Google cloud, the data is stored in Fusion Tables. At the end of the process a Marc 034 record is available along with a KML for Google Earth and a World file for GIS systems.

12 12 A link was added to the top bar.

13 13 Georeferencer landing page and help page.

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19 19 Test pilot results Last update: 30 OCT 2012 Total amount of ground control points (GCP) created Average GCP per document 16,1717 Maximum number of GCP on a document 246 Minimum i number of GCP required 5 Unique users 88 Days the pilot lasted 24 Georeferenced documents 999 Edits 1997

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21 21 Gamification The game and the competition as drivers to encourage participation. The reward is an important incentive

22 22 Georeferenced materials in the collections KML The KML link is added as a new metadata to every georeferenced object. In this example a geological map, RM

23 23 Georeferenced materials can be accessed through the map or the gallery.

24 24 The envelopes of the 999 georeferenced maps in Fusion Tables

25 25 MapRank search A new paradigm to discover and use old maps

26 26 Takeaways Users are a huge source of specialized information Most of them are willing to contribute Enriching our catalogs by crowdsourcing is a win-win scenario Requires many staff hours for Quality Control and moderation User Generated Content not yet easily reusable in CONTENTdm

27 27 Crowdsourced Georeferencing of Old Maps Gràcies per la vostra atenció Institut Cartogràfic de Catalunya Parc de Montjuïc, E Barcelona 41º22 12 N, 2º09 20 E (ETRS89) Tel. (+34) Fax (+34) rafael.roset@icc.cat

28 28 Backup slides Backup slides

29 29 Map library tasks

30 30 Equipment Scanner 2A0: METIS Scanner A3: Kodak IQsmart3 Scanner A4: HP Scanjet 8300 Roll scanner: HP 4500

31 31 Digitization Digitized documents at the map library during Maps (sheets) Photographs Book pages Documents Total

32 32 Internal ad hoc catalog for maps Atlàntida (MS Access) DC CONTENTdm Toporama (xls, txt, shp) Gerbert C R O S S W A L K MARC 21 (Oracle) ISO CBUC Virtua (marc) IDEC

33 33 Cataloging and digitization process in the Map library of Catalonia Analogic map Cataloging Identification number Digitization Atlas Map series Single map C A T A L O G U E First level catalogue: general description Second level catalogue: sheets Copy description catalogue (Id. Number) / Metadata metadata Scanning Quality control TIFF files ICC Data Center Other formats Dublin Core Derived JPEG files INTERNET

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