GIS Interface for a Digital Library
Dabbling with GIS-driven web interfaces a couple of years ago taught me that it might be something one could master, given time. That’s still true. But the things we could do with it! We had an summer position working on this, and I hope to roll it out after some more summer work this year.
The idea is to link bibliographic searching to a GIS system, built with the open-source MapServer package. We extracted all our geographic subject terms and mapped them (which took a bit of research in some cases – we’ve got dioceses from the nineteenth-century missionary period, for example). We then included them as a data layer in a MapServer interface. This will let us do two things:
- Search by clicking–navigate the map until you find the area you want, then click to run a search. The system gathers all the subject terms that are anchored within a given radius of your click and composes a bibliographic search for those terms. Thus, to give you all the results for a certain region, we don’t have to have created a subject term for that region; we just have to have catalogued a bunch of places in that region. As a further refinement, you’ll be able to enter extra search terms to limit your search, e.g. to search for items concerning schools within the selected geographical region.
- Map your search results–run a regular bibliographic search, then click on a map icon and see your results as dots on a map. We’ll extract the geographic subject terms from the result records, pull out their GIS data, and map them. Maybe have different-sized dots to indicate number of hits, etc. Click on a dot to see the records associated with that place (this can be a follow-on search of the type described above).
None of this is at all difficult to implement, once you’ve got the GIS underpinnings built.
The power of a GIS-based presentation is striking. My favorite example is one built by the city of Vienna, as the basis of an archival digitization project: the records of the eviction of Jews from public housing after the Anschluß. Click to the English-language interface, then “Project Reason for Eviction - non Ayrian”, then “Map”. You can zoom in on a map of Vienna and ultimately view records of individuals and families, often with information about their fate: e.g. Gisela Goldmann, Diefenbachgasse 49, evicted Aug. 1 1938, deported with her husband Ignaz to Theresienstadt in 1942 and to Auschwitz in 1944. You can see her neighbours and her neighbourhood. Giving the user the ability to navigate from the general to the particular in this way has a tremendous impact.
Nothing in our digital library will be as gut-wrenching as this, but I think our GIS interface will give our users a sense of control over their search results that is lacking in the familar “page 1 of 36” at the top of the first screenful. I hope that GIS will ultimately become part of our basic toolkit in web development.
Great Idea. Would love to try it with our newspaper collection, as are often asked whether we have newspapers from a particular region. Although we do provide an option to search by place newspaper published in our catalogue, it is part of our advanced search option, and almost noone choses it.
recherche cartographique Peter Binkley, qui est Digital Initiatives Technology Librarian (ce titre est tout un programme...) à l'Université de l'Alberta, parle dans son blog d'un projet intéressant sur lequel il travaille : une interface GIS pour une bibliothèque numér...
I think a GIS interface would be a nice addition to some of the historical and geographical collections. Have you looked at some of the Google Map hacks out there? Some interesting things being done with merging maps with other data that might give you some ideas. Listed a couple examples on my blog: http://ebybox.aresgate.net/blog/archives/hacking-google-maps/
Hi - I'm very interested to know if the interface is something that I can see...I'm trying to find examples of the intersection of digital libraries and GIS to use for research in grad school. Alas, most of what is out there are people trying to figure out how to share GIS data, rather than using GIS as an organization tool for libraries. Any info would be great!
[...] What we do have are LCSH headings. These allow us to group records on the same subject, and also to link to relevant external resources (in the form of subject searches against other repositories that use LCSH). We can get more benefit out of them if we pay attention to the metametadata: if, for example, we note which ones are geographic headings and enhance them with GIS data (as I've discussed before - still working on that one!). This allows users to navigate our records in a new space, defined by a new set of metadata, but without our having to touch the individual records. [...]