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Map History


ABOUT the listing of early map image sites on the web

(and about web images in general)


go to: IMAGES OF EARLY MAPS ON THE WEB


Page created 13 February 2001 and amended in minor ways at various dates thereafter

Using the listing Looking at maps online Other ways to find maps online Technical matters Hosting a map image site


USING THE LISTING

Finding your way around the listing

There is no index to the images of individual early maps on the web. It is likely that there are now (December 2007) several hundred thousand early map images. The accompanying listing deals with sites, not single images. So, how can you find what is out there? Probably, you want maps of a particular part of the world. For that reason, the listing is arranged geographically. As you would expect, a collection based in an area is likely to be strong on maps of that area. However, confusingly, a number of sites range more widely. Always check out those in the 'General and Miscellaneous' section, and try those in the broader region that contains the area you are really interested in: United States or North America, for example, when you want a particular state. Equally, early maps tended to cover a wide area, so those who mount 17th century maps of their country or state will often put up maps of a much wider region.

For a joint search on the David Rumsey and a handful of other collections, see Visual Collections: images of art, history and culture.

Some sites go beyond this 'Map History' site in the detail they provide for a given area, even sometimes including links to separate images. The best way to retrieve those would be to search the individual pages of the Images section for gateway and links.

Alternatives to geography might be:

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What has been excluded

The following categories have been systematically excluded:-

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LOOKING AT MAPS ONLINE

Viewing maps online

Most images appear on your screen, along with the text, without your having to do anything special. What you may see at first is a small 'thumbnail'. In these cases, it is always a good idea to try clicking on the image (or, occasionally, on a text link or magnifying glass nearby). If this is going to be possible, place your mouse cursor over the image - or over where it will be emerging - and it will appear as a pointing hand rather than an arrow. That is a sure indication that this is a link to a larger version of the image. You do not have to wait for the first version to appear before starting to load the larger version. Sometimes you can enlarge several times. Alternatively, if you right click with your mouse you may be offered a 'zoom in' option.

The larger images may be 'scrollable' and, occasionally, 'zoomable'. Many original maps are larger than a computer screen. The most helpful sites - or those that can find the resources of time and money for this expensive operation - enlarge the map image well beyond its original size. You can then scroll (or pan), up/down or sideways, until the part you want is in view.

That is a way of treating an entire map as one large image. Another method is to invite the user to click on the section of interest and then zoom into that detail at an enlarged scale. Among the more popular programs to achieve this are JPEG2000, MrSID, Insight and Zoomify. These allow you, simultaneously, to enlarge an image and zoom into a detail, see for example the Library of Congress 'American Memory' site and David Rumsey's Collection online. For details about those two sites see under Large general sites. For information about the programs mentioned see Software requirements.

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OTHER WAYS TO FIND MAPS ONLINE

Main listings sites

The following sites have been ransacked (with grateful acknowledgement) for their relevant links. The PCL site includes some single image sites, as well as many 'historical' maps (i.e. modern reconstructions). Neither of those types has been included in this listing:-

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Search engines

At the time of writing (February 2001) search engines, which are now sophisticated in retrieving text, are disappointingly imprecise in locating images. This is likely to be because databases, used to organise most image sites, are not indexed by search engines. Of the four I use, two offer specific image options. Altavista has two routes, which seem to produce the same results (1) Search Tools: Image Search, (2) Media/Topic Search: 'Search in': Images. Ixquick offers a 'Pictures' option. These retrieve small numbers of relevant thumbnail images, but they are rarely for antiquarian material.

Entering into Altavista, Ixquick, Google's Image search or All the Web (Fast Search) a formula such as: +map +[place/area name]is likely to produce vast numbers of hits. Refining this with added terms - perhaps +century, to pick up imprecise descriptions such as "[18th] century", or +gif (or +jpg), as a guess at its likely format - will only help a little. The quality of hits using the formula +map +[area] +century was higher on Google than on the other three.

It is suggested (October 2005) that the Infomine dedicated 'map' search be used and (March 2007) that OAIster ('a union catalog of digital resources') can provide good access for digital images.

For general comments about searching for images see:-

  • 'How to find images on the internet' (Kurt Buyse on the 'Random Knowledge' blog, 9 May 2008)
  • 'Start Your Search Engines Part 2. When image is everything, here are some great ways to find one' (Anna Adam and Helen Mowers, in School Library Journal, 1 May 2008)
  • 'Image Research at Duke. Searching for Images on the Web' (Duke University, Lilly Library)
  • 'Finding visual images on the web' by Heidi N Abbey, revised by Kate Fuller 2007
  • 'Finding images on the web' by Ruth S Thomas [revised by Kate Fuller May 2007]
  • 'Finding images on the internet' by Phil Bradley, in Ariadne (September 2000)
  • Online Sources for Images: Search Engines (David Cappoli, UCLA Department of Information Studies)
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    TECHNICAL MATTERS

    Image quality

    The comments about image 'resolution', given in the brief description to each entry in the listing, refer to the appearance of the map. They are not intended to be understood as technical observations, for example about 'dots [or pixels] per inch' (dpi), or the way the image was scanned or compressed.

    'High resolution' is used to indicate map images whose place-names - even the small ones - are easily readable. This seems to me the most important consideration. It may be possible to read some of the place-names on 'medium' resolution images. Unfortunately, many of the images mounted on the web are of low resolution so that, even when the map fills the screen (and sometimes when a zoom option is available), details are blurred and the place-names illegible. This particularly applies to pdf images. Low resolution images give a general idea of the map's appearance but are of no use for serious study, whether you are a scholar or someone researching your family history. You need to be aware that image quality will also depend on the speed and age of your computer. It may be that the images appear to you better or worse than they do to me. However, 'high res.' should always appear clearer than 'medium res.'

    It is easier to provide a high resolution image of a 'miniature' map (where several originals could fit onto a single computer screen) than of a standard map that will be larger (sometimes very much larger) than the screen. For that reason you will find a lot of miniature maps on dealer sites!

    There is often a balance between image quality, the time taken to download the map, and the cost of storage space. You should not expect a clear image, occupying, perhaps, twice the size of your screen, to be delivered instantaneously. Even if most people will not wait more than 30 seconds for a page to load, you may have to be the exception. However, some relatively poor quality images are slow to load, although it must be pointed out that loading speed can vary for a number of reasons. It is also possible that some of those sites I have described as 'slow-loading' will have improved their delivery by the time you go to the site. At the other extreme, the best sites offer fast-loading, high quality images (see under Software requirements).

    To search in the listing for high quality, press Ctrl+F and enter: high res. If you want speed, enter: fast-loading. To find those that have both virtues, enter: fast-loading, high res. Alternatively, search for JPEG2000, MrSID, Insight, Zoomify etc..

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    Technical information

    It is generally accepted that 300 dpi (dots per inch) is the minimum resolution for acceptable image capture - from the original - of the full version of a map. Those on the Project Pont site, for example, are delivered at 400-700 dpi and the National Oceanic and Atmospheric Administration's Historical Map and Chart Collection at 800 dpi. Scanning from a slide or microfilm, like those in the Hargrett Library's Rare Map Collection at the University of Georgia, which were 'scanned from microfilm negatives at 2400 dpi', does not necessarily lead to clear images, unless the originals were unusually small.

    In some cases, a lower resolution version might have been intentionally mounted on the web, for example for copyright reasons. The development, and widespread use, of effective digital 'watermarking' may solve this security problem.

    It needs to be remembered that when maps are scanned at 300 dpi, this is several times the resolution of a normal PC monitor (about 72 dpi). Viewing an image at 100% or 1:1 will usually mean that what you are seeing is about four times larger than the original! This is why, to achieve full legibility, most maps need to be enlaged well past their original size.

    File sizes may vary enormously. They can be expressed in pixel (or 'Window') size (e.g. 640 x 480) or in bytes. The file size might range from 50 Kb for a small, low resolution image, to an average 150 Mb (over 150,000 Kb) for those on the David Rumsey site, rising to two gigabytes (over 2 million Kb) for the largest files on that site. The use of MrSID software (as part of 'Insight') ensures that these large files can be delivered speedily, because they may have been compressed down to as little as 3% for delivery. JPEG2000 is an open source compression technology. On JPEG2000 see notes by the Library of Congress.

    Images will usually have the extension .gif or .jpg.

    There is an excellent technical summary (including a list of metadata standards), unfortunately not online and difficult to track down:
    Chris Fleet, 'Seeing the world in pixels: practical essentials for successful map digitisation projects', Cartographiti: the newsletter of the Map Curators' Group of the British Cartographic Society, 74 (June 2005): 6-14.

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    Software requirements

    Some sites require you to download viewing software, if you do not already have it stored on your PC. This is usually available free of charge, though you may need to buy software if you are going to create images. You can find general information about this, and particularly on MrSID and FlashPix, in David Yehling Allen's 1998 article, 'Creating and Distributing High Resolution Cartographic Images'. Some of these programs work on the principle of partial delivery, saving bandwith and, simultaneously, protecting the image owner from having an entire image removed for reuse. See also Creating map images . For more specific information about the software you may encounter, see the following:-

    It is, in principle, possible to download images from two different sites and then compare them. It is also worth remembering, if you find that the image occupies part of the screen [a frame], that you can use your right mouse button to 'open in a new window' and thus enlarge the map to fill the screen.

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    Citing electronic images

    On this, see the explanatory page, 'Citing Electronic Sources' (part of the Library of Congress 'American Memory' site). This has examples of two different citation formats, and a list of links to other relevant sites.

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    HOSTING A MAP IMAGE SITE

    Creating map images (helpful texts) and digital preservation issues

    If you are planning to create images yourself, various guides are available:

    2007 onwards:

    before 2007:
  • Wegwijzer: Setting up an Image Bank (Yvette Hoitink, Royal Archives, The Hague, 2007)
  • 'Handbook for digital projects: a management tool for preservation and access', edited by Maxine K. Sitts (Northeast Document Conservation Center, Andover, Massachusetts, 2000) [a searchable online book, by various experts, comprising: 1. Introduction, 2. Overview: rationale for digitization and preservation, 3. Considerations for project management, 4. Selection of materials for scanning, 5. Overview of copyright issues, 6. Technical primer, 7. Developing best practices: guidelines from case studies, 8. Vendor relations, 9. Digital longevity, 10. Scholar commentary: an end-user speaks up. You can be notified by email when a page changes]
  • Digital Preservation: The National Digital Information Infrastructure and Preservation Program - a Collaborative Initiative of the Library of Congress (including reports and papers, 2003)
  • D-Lib Magazine (online and freely accessible, this regularly carries relevant articles)
  • 'Digital Preservation' (Chapter 6 of the North Carolina Echo [Exploring Cultural Heritage Online] 'Digitization Guidelines')
  • The Digital Conservation Coalition (the 'Handbook' provides an introduction)
  • DIGLIB. 'A discussion list for digital libraries researchers and librarians' (run by IFLA)
  • 'Resources for Conservation Professionals' (Conservation OnLine [COOL])
  • Moving Theory into Practice: Digital Imaging Tutorial (a comprehensive and well-organised tutorial from Cornell University Library)
  • 'Digitizing Images and Text' (Articles & Papers, Companies, Example Projects, Reference, Resources, Tools - from Berkeley Digital Library SunSITE)
  • MapHist list for July 2006 - see the threads, 'use of digital images for research' and 'watermark', for a discussion of the reasons why researchers might need to see an original, and the value of scans as surrogates for such originals
  • 'Perception, cognition and technology in the reading of digital cartography' (research note by Piero Falchetta, about the legibility of digitised copies of early maps, in: e-Perimetron , 1:1 (Winter 2006), pp. 77-80 - "Even if printed in very small type, all the inscriptions on a map must be readable if that document is to provide the highest possible quantity of information")
  • 'Preserving maps for the future: USGS faces a challenge in protecting cartographic data' (by Aliya Sternstein, 1 August 2005, for FCW.COM, about the "$500 million Electronic Records Archives project, which they hope to have in place by 2011")
  • 'Digitizing Sanborn Fire Insurance Maps™ for a Full Color, Publicly Accessible Collection' (Kenning Arlitsch, J. Willard Marriott Library University of Utah, in D-Lib Magazine, Volume 8 Number 7/8 (July/August 2002))
  • ’Map Imaging Service Providers’ (by David Y. Allen, MAGERT Electronic Publication No. 5)
  • 'Improving Digital Photos of Maps & Prints' (Helen Glazer, 2002)
  • 'Hybrid considerations on the sustainability of cartographic heritage' (about quality issues in map reproduction, by Markus Jobst in: e-Perimetron, 1:2 (Spring 2006), pp. 127-37)
  • Rare Maps Digitisation Project Report by the National Library of Australia (describing the results of extensive research and experimentation)
  • 'Historical Map Collection Web Site' by David Rumsey (from the 'Museums and the Web' conference - March, 2001). For details about his image site, see Large General Sites
  • 'Distributing images and information over the Web - a case study of the Pont manuscript maps' (Chris Fleet in LIBER Quarterly 10,4 (2000))
  • Oversized Color Images: Addressing Issues of Preservation and Access (New York State Museum Bulletin's Project, Columbia University Libraries/Academic Information Systems)
  • Preserving Access to Digital Information (PADI) (again from the National Library of Australia, this time 'a subject gateway to digital preservation resources', including sections on 'data documentation and standards', 'formats and media', 'digitisation' etc.)
  • 'Creating and Distributing High Resolution Cartographic Images' by David Yehling Allen (RLG DigiNews: Vol.2, Nr.1, 1998)
  • The microreproduction and digitization of maps: a comparative analysis by Thomas Corsmeier (WAML Information Bulletin, Volume 30, no. 1, pages 10-34, November, 1998)
  • 'Digital Historical Maps' (final report, by Stefan Gustafsson, on the collaborative Danish, German and Swedish project, 2001)
  • Austro-Hungary. ‘Building a Globally Distributed Historical Sheet Map Set of Austro- Hungarian Topographic Maps, 1877-1914’ (by Patrick McGlamery in RLG DigiNews 9, 1 (February 2005), describing a project to scan and geo-reference images)
  • New technologies for the georeferenced visualisation of historic cartography (8-page, pdf text by Francesco Guerra)
  • ’Digitisation of the map collection of the National Library of Estonia - Rahvusraamatukogu Kaardikogu Digiteerimisest’ (report by Margit Tohver, National Library of Estonia, in Estonian with English summary, of a digitisation project in 2000-01)
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    Copyright

    The United States Copyright Office site has information on the US position, and links to other sites

    For an analysis of (US) copyright issues by Georgia Harper of the University of Texas, see 'Fair use of copyright materials'. From the same university there is also a Copyright Crash Course Online Tutorial

    ’United States Map Copyright Litigation, 1789-1998’ (by J.B. Post, 2000)

    'Orphan Works: Statement of Best Practices' ('Standards, Guidelines, and Best Practices' from the Society of American Archivists, June 2009)

    'Overview of Legal Issues for Digitization' by Melissa Smith Levine (Legal Advisor, National Digital Library Project, Library of Congress), Chapter V in Handbook for Digital Projects: A Management Tool for Preservation and Access

    Association of Research Libraries (ARL). 'Federal Relations and Information Policy' (tracking the 'activities of legislative, regulatory, and government agencies and related organizations in North America and abroad that impact research libraries'

    ’About Intellectual Property’ (World Intellectual Property Organisation)

    'Copyright, Intellectual Property Rights, and Licensing Issues' (current awareness, reference, articles, etc. - from Berkeley Digital Library SunSITE)

    EBLIDA (European Bureau of Library, Information and Documentation Associations) is an independent umbrella association of European institutions, focussing, inter alia, on copyright

    The situation in the UK is explained in the government site, Intellectual Property (UK Intellectual Property Office - an operating name of the Patent Office)

    '10 Big Myths about copyright explained' (Brad Templeton)

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    A plea to those who host map images

    The experience of examining thousands of map image sites [those in the listing and a considerable number that were rejected] has made me aware of their variety, and the great range in terms of quality and usefulness. Since you are unlikely to repeat this exercise, I offer some thoughts and suggestions prompted by it.

    Image selection

    The most effective sites are those with a clear purpose: perhaps a selection of maps of a particular region (which is the way that this listing has been organised) or those concentrating on a single subject (see Themes). Often, however, the motive seems to be 'window-dressing' - an attempt to show a few, random samples. Many of the sites listed under Medium and small general sites are like that - and hence unclassifiable. Please seriously consider a focussed approach.

    Image quality

    In determining the purpose of web-mounted map images, deciding on image quality is as important as the selection of maps that are going to be scanned. Why are you offering these maps to the world? What do you think the viewers should/could/will do with them? If they are meant to permit people, anywhere, the same type of access as you (assuming you are an institution) offer to those who handle your originals, then you need to take a route that ensures sufficiently high quality to allow every single place-name to be read. Anything less and these are not true surrogates. It would be helpful if, in the context of digitisation, each map was treated as if it was a text, rather than just an image, and as a text that employs unusually small type faces. The capital letters of Times New Roman, for example, stand 2.5 mm high in Word size 11 (a standard reading size), yet the names on early maps can go down to 1.5 mm or even to 1.0 mm. This is far smaller than would ever be used in a connected text. Yet it is precisely those names - the lowest in the hierarchy - that are likely to be searched for, not the names of large towns or regions. For this reason some sites link the images to lists of place-names [search 'Images of early maps' for 'gazetteer' or 'place-names'].

    Alternatively, if you use one of the high quality programs, you may be opening up new, and exciting, possibilities [see 'Innovative sites' for examples] allowing maps to be viewed clearly at a larger size than the original, and compared side-by- side on a single screen with another example from a different collection. Why not search the listing [Ctrl+F] for fast-loading, high res. sites and see how they have done it?

    Accessibility

    Even when somebody has found your site, their problems may not be over. Because so many web designers seem to forget about the site's users, navigating within a site can be like finding your way in a maze. There is often no apparent structure to the various pages. And that, of course, assumes the viewer has managed to see the pages at all. Some designers are more interested in clever graphics than in speed of loading. People who seek maps have little or no interest in where they are stored (physically or in web space). When the images are scattered, could there not be a single index [i.e. a list of hyperlinks] to all the web-based maps in that institution? If you are a map librarian or curator please try and persuade your 'Webmaster' of this. It is unlikely that anybody else will!

    Indexes

    Please consider providing one or more indexes, if you are involved in a larger image site (say, with over 100 images). The very Large general sites already do this. The problem is that individual maps are hard to find on the web (see Search engines).

    Captions (metadata)

    The question of cataloguing standards appropriate for digital map images, and the resources that might or might not be available for that, are too big to be dealt with here. But for map scans to serve their full useful purpose it is clearly essential that they are accurately described. Since maps tend to have been copied from earlier models, a common mistake is to assume that the date of publication is the same as the date of the information. For a good, individual example of this see a message from Peter van der Krogt to the MapHist list (13 January 2007).

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    Innovative sites that are worth checking out

    In many cases, loading map images onto the web is seen as an end in itself. Some sites, however, provide 'added value', in various ways that might serve as models to others. For more information on these sites see the appropriate geographical page in the Web Images section

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    The future? - issues and suggestions

    Indexing

    The archive of the MapHist list will show that, over the past few years, there has been much discussion about the need to index map images on the web. The ideal would, of course, be to catalogue each image fully. But, to find what a person wants, an index is usually sufficient. This listing - the first systematic attempt to record all significant early map image sites - could be used as the first stage in that cataloguing or indexing process, by anyone courageous enough to attempt the task. [They would be assured of 'Hero of the Web' status is they succeeded!]. It might be thought that the only images worth indexing would be the high resolution ones. [To find these on the listing, search [Ctrl+F] for: high res.]. Some of the largest such sites - like the Library of Congress 'American Memory', NOAA's 'Historical Map and Chart Collection' and David Rumsey's private collection - have their own indexes. The problem is that you cannot search, simultaneously, across all of them. Nor can you search, at all - by area, cartographer, date, etc. - for single images mounted on the other high resolution sites.

    Amendments

    When you mount early map images for the first time, or include a group of new ones, please notify me or send a message to the MapHist list. You do not need to be a subscriber to do this. For details, see the MapHist page on this site. Please also make a point of notifying me if the URL changes, especially if no forwarding message is left!

    Please send amendments to the compiler Tony Campbell:  

    Archiving

    Will these images be available in ten years' time? Who is thinking and planning about long-term storage?

    Acknowledgements

    Thanks are due to various experts for their tutorials. Only the compiler can be blamed for what he has failed to understand -

    Tony Campbell:  

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    Images of early maps on the web


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