Wednesday, March 26, 2008

GeoPDF

Paper maps are probably the most common form of GIS output. However digital products are obviously important too. Exporting maps from one's GIS as JPEGs is one easy way to provide users with digital copies - these can be posted to websites and/or emailed to your audience who can easily view them on their computers, insert them into reports, etc. . Here's an example set of free maps of Tobago.

GeoPDFs seem to provide a more sophisticated option for the GIS professional to consider. The GeoPDF format is proprietary and it needs a piece of software (Map2PDF from TerraGo Technologies) to produce. GeoPDFs are normal PDF documents, but with interactive maps - map layers can be switched on/off, users can zoom in/out, measure distances, view coordinates and attributes and change projections. They allow a fuller presentation of your GIS dataset to your audience. Acrobat Reader is needed to view the PDF, and in order to view the interactive elements in a GeoPDF, one must first install a free Acrobat Reader plugin (GeoPDF Toolbar). The plugin is 19MB. One needs to provide contact information to get it, which seems fair.

Jean-Nicolas Poussart of the CEP, who first mentioned this product to me, offers a user opinion of Map2PDF:
I tested the free trial to create GeoPDFs and it worked fine. I am not aware of a similar free product to make GeoPDFs, but it wouldn't surprise me if we would see this soon. As Acrobat is so popular, you can imagine how interesting it becomes to use this format (PDF) to distribute interactive maps.

Jean-Nicolas also points out that each GeoPDF is only one (interactive) map. I suppose to make a mapbook, or to include one's GeoPDF in a report that also includes text and pictures, one could collate the GeoPDF(s) with a PDF(s) of the text pages - with Acrobat.

Though it's free to try, Map2PDF has a cost - but neither the company's website nor its sales representative for the LAC region is immediately forthcoming about the amount. When a company doesn't state the cost of a predefined product, a person could feel like the customers are being kept at arms length, especially when the sales department doesn't reply to enquiries. (It's understandable if the cost of a service varies, as this may depend on what the individual customer wants and/or the circumstances). In addition, a GeoPDF on the manufacturer's website - their map of sales districts - seems to have an odd error. If you can download and examine it - with the abovementioned GeoPDF Toolbar installed - you'll notice that the Equator is apparently further south than it should be. It's a small scale map, but last we knew the Equator is just north of the mouth of the Amazon, and in this GeoPDF, when queried, the Equator seems nearer to the Tropic of Capricorn. See the screenshot at left. Again, the sales representative has not responded to a request for advice on this.

So, though I haven't tried it yet myself, and I very much like the concept of distributing GIS outputs as interactive PDF maps, I'm not overly impressed by the company's approach to the outside world. For now I might just stick to my trusty Export ... JPEG.

Tuesday, March 11, 2008

Informatica 2009

The Informatica 2009 13th International Convention & Fair will be held in Havana, Cuba on Feb 9-13 2009. The conference will be held in Spanish and English and the deadline for submission of abstracts and papers is Sept 30, 2008. More information can be found on informaticahabana.cu or informaticahabana.com.

Sunday, March 02, 2008

GSDI 10

GSDI 10 was held last week at the University of the West Indies, St. Augustine, Trinidad. 'Open' - as in the Open Geospatial Consortium (OGC), open access to data and Open Source GIS - seemed to arise as technological, administrative and social aspects of building a spatial data infrastructure were elaborated on and discussed by presenters in technical and plenary sessions. More thorough information can be had from the GSDI website (abstracts, and often slides and papers).

Mark your calendars for GSDI 11. It will be held in Rotterdam on 15-19 June 2009.