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Petr Žabička: Crowdsourcin old maps
The TEMAP project aims to crowdsource the georeferencing of old map collections to make them searchable online. Key accomplishments include developing a georeferencer tool that allows non-experts to align digitized historical maps to modern maps. A pilot involving nine institutions in the Czech Republic saw over 17,000 users contribute over 260,000 control points to georeference maps. Future work includes addressing challenges like handling non-mappable images and implementing quality control. The end goal is to provide intuitive search of historic maps by time and location.
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Petr Žabička: Crowdsourcin old maps
- 1. TEMAP Project –Crowdsourcing Old Maps Petr Žabička Moravian Library in Brno
- 2. Agenda • TEMAP project • Access • Search • Georeferencing • Future work
- 3. TEMAP Project • TEchnologyfor access to Czech MAP Collections • MZK, Charles Uni (CU), Masaryk Uni (MU) TEMAP results: • Georeferencer and Georeferencer based workflows (MZK) • Detection of cartographic projection from a scanned map (CU) • Tool for map series cataloguing (IIIrd military mapping) (MU) • Testing tools for duplicate/similar map image detection (MZK) • Map cataloguing guides and online courses (UK) • Cataloguing and digitisation of map collections (4 globes, 50000 maps) • Improvement of geoname search tools
- 4. Why? Help to putold map collections online
- 5. Aims • Online publishingof high resolution scans of old maps • Intuitive search based on time and location • availability of geographical coordinates of the map edges • Map comparison • availability of geographical coordinates of selected points on the digitized map
- 6. Old Maps inMZK MZK has long been involved with old maps: • Digitisation and online publishing of its map collection • http://mapy.mzk.cz/ • Use or development of free and open source tools for • modification and publishing of large images • placing old maps on a contemporary world map • map search • Projects: Historical Collections of MZK, Old Maps Online, EuropeanaTravel, TEMAP, ...
- 7. Publishing Image resolution: 300+dpi • Nip2 image processing software • Image tiles • Large number of tiles => jpeg2000 and IIPImage • Tile based map viewing => Zoomify + OpenLayers • Digital library => Kramerius + metadata editor
- 8. Publishing NIP2/VIPS image processing: • Halfway between excel and Photoshop • Works with TIFF • Modification and stitching of very large images • Freely avalilable, can process images larger than the amount of available memory in a PC JPEG2000 conversion (using Kakadu software library) • Jpeg2000 creation recommentdations • Quality layers, zoom levels etc.
- 9. MZK and IIPImage • Added JPEG2000 support using Kakadu library • JPEG2000 created with inappropriately chosen parameters will result in a very slow map display! • Memcached tile cache • Optional watermarking support • Tileset standards: IIP, DeepZoom (MZK), Zoomify (MZK), IIIF (ÖNB) • MZK publishes installation packages for Debian Linux and a Windows installer http://help.oldmapsonline.org/jpeg2000/windows/
- 10. Tile Viewing • IIPImagegenerates tiles of all four supported standards • Many different tile viewers can be used with the same image server (Java, Flash or Javascript based) • OpenLayers preferred for maps • Currently using modified version 2 • Version 3 (now in beta) adds native Zoomify support • Other viewers can use DeepZoom or IIIF tile structures (Seadragon/SandDragon)
- 11. Digital Library • Kramerius4 can work with IIPImage • DeepZoom or OpenLayers viewer • Page thumbnails can be created by IIPImage on the fly • Metadata editor for Fedora Commons repository • code.google.com/p/meta-editor Kramerius is not mandatory for the other tools mentioned in this presentation
- 12. Search • Full textsearch fails on maps • Geographic names change in time, spelling varies • Different institutions create different quality of metadata • How to account for the scale of a map in search? ⇒ Maps can best be searched for on a map!
- 13. Search • Search systemrequirements: • Support for geographical relevance ranking • Scalability (user numbers, map index) • Speed (immediate response to change of search parameters) • Data requirements: • Geographic bounding box coordinates • Scale of a map or its size & DPI • Year of publication, year/era shown on a map
- 14. • JISC Project • Indexes many online map collections worldwide • Based on MapRank Search technology • (http://www.mapranksearch.com) • Project started in February 2012 with 6 collections • 30000 visits per day when announced
- 16. • Open fornew map collections (for free) • All rights remain with the collection owners Requirements: • Online zoomable maps in high resolution • Permanent URL and free access • Basic description of the maps in Dublin Core including a bounding box data
- 17. Bounding Box • Whilecataloguing: BoundingBox tool • Online published maps: Georeferencer
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- 19. Georeferencer • Enriches metadataof scanned maps • Runs in a web browser • Intuitive • Crowdsourcing friendly – wiki-like • Shows 2D and 3D map overlays • analyses map accuracy, calculates a bounding box • Successful pilots in several institions:
- 20. Pilot of 9institions under the TEMAP project: • Moravian Library in Brno • Charles University in Prague • Masaryk University • National Library of the Czech Republic • Museum of West Bohemia in Pilsen • University of Jan Evangelista Purkyně • Research Library in Olomouc • Research Library in České Budějovice • National Technical Library
- 21. • Pilot start21st March 2013 • Motivating users - competition • Institutions supplied csv files with metadata and their logos • Metadata created by the users are available to enrich the map presentations in the individual institutions
- 23. Project status afternew map import today
- 25. • Over 17000users • Over 260000 control points • Highest number of points on a map: 581 (minimum required: 5) • Most active user: over 30800 points (11,5%) • Most work done right after pilot announcement by the media • Some images were not maps (text, veduta)
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- 28. New requirements: • Markmap as impossible to georeference • What about border cases? • Map rotation (OpenLayers 3 working prototype) • Using another old map for georeferencing • Mandatory crop lines • Quality control interface • Several maps on one sheet • Reference map with a prominent river network • Overlay improvement – map warping in a browser
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