11 February, 2014
A special delight during my PhD research was to discover, at the UCL library the proceedings of the first ever symposium on GIS. Dr Tomlinson studied towards a PhD at UCL, and probably that is how the copy found its way to the library. It was fairly symbolic for me that the symposium was titled ‘environmental information systems’. See my earlier comment about the terminology: Geographic information or Environmental Information.
10 December, 2013
There is something in the physical presence of book that is pleasurable. Receiving the copy of Introducing Human Geographies was special, as I have contributed a chapter about Geographic Information Systems to the ‘cartographies’ section.
It might be a response to Ron Johnston critique of Human Geography textbooks or a decision by the editors to extend the content of the book, but the book now contains three chapters that deal with maps and GIS. The contributions are the ‘Power of maps’ by Jeremy Crampton, a chapter about ‘Geographical information systems’ by me, and ‘Counter geographies’ by Wen Lin. To some extent, we’ve coordinated the writing, as this is a textbook for undergraduates in geography and we wanted to have a coherent message.
In my chapter I have covered both the quantitative/spatial science face of GIS, as well as the critical/participatory one. As the introduction to the section describes:
“Chapter 14 focuses on the place of Geographical Information Systems (GIS) within contemporary mapping. A GIS involves the representation of geographies in digital computers. … GIS is now a widespread and varied form of mapping, both within the academy and beyond. In the chapter, he speaks to that variety by considering the use of GIS both within practices such as location planning, where it is underpinned by the intellectual paradigm of spatial science and quantitative data, and within emergent fields of ‘critical’ and ‘qualitative GIS’, where GIS could be focused on representing the experiences of marginalized groups of people, for example. Generally, Muki argues against the equation of GIS with only one sort of Human Geography, showing how it can be used as a technology within various kinds of research. More specifically, his account shows how current work is pursuing those options through careful consideration of both the wider issues of power and representation present in mapping and the detailed, technical and scientific challenges within GIS development.”
To preview the chapter on Google Book, use this link . I hope that it will be useful introduction to GIS to Geography students.
During the symposium “The Future of PGIS: Learning from Practice?” which was held at ITC-University of Twente, 26 June 2013, I gave a talk titled ‘Keeping the spirit alive’ – preservations of participatory GIS values in the Geoweb, which explored what was are the important values in participatory GIS and how they translate to the Geoweb, Volunteered Geographic Information and current interests in crowdsourcing. You can watch the talk below.
To see the rest of the presentations during the day, see https://vimeo.com/album/2475389 and details of the event are available here http://www.itc.nl/Pub/Events-Conferences/2013/2013-June/Participatory-GIS-Symposium.html
17 December, 2011
The Eye on Earth Summit took place in Abu Dhabi on the 12 to 15 December 2011, and focused on ‘the crucial importance of environmental and societal information and networking to decision-making’. The summit was an opportunity to evaluate the development of Principle 10 from Rio declaration in 1992 as well as Chapter 40 of Agenda 21 both of which focus on environmental information and decision making. The summit’s many speakers gave inspirational talks – with an impressive list including Jane Goodall highlighting the importance of information for education; Mathis Wackernagel updating on the developments in Ecological Footprint; Rob Swan on the importance of Antarctica; Sylvia Earle on how we should protect the oceans; Mark Plotkin, Rebecca Moore and Chief Almir Surui on indigenous mapping in the Amazon and man others. The white papers that accompany the summit can be found in the Working Groups section of the website, and are very helpful updates on the development of environmental information issues over the past 20 years and emerging issues.
Interestingly, Working Group 2 on Content and User Needs is mentioning the conceptual framework of Environmental Information Systems (EIS) which I started developing in 1999 and after discussing it in the GIS and Environmental Modelling conference in 2000, I have published it as the paper ‘Public access to environmental information: past, present and future’ in the journal Computers, Environment and Urban Systems in 2003.
Discussing environmental information for a week made me to revisit the framework and review the changes that occurred over the past decade.
First, I’ll present the conceptual framework, which is based on 6 assertions. The framework was developed on the basis of a lengthy review in early 1999 of the available information on environmental information systems (the review was published as CASA working paper 7). While synthesising all the information that I have found, some underlying assumptions started to emerge, and by articulating them and putting them together and showing how they were linked, I could make more sense of the information that I found. This helped in answering questions such as ‘Why do environmental information systems receive so much attention from policy makers?’ and ‘Why are GIS appearing in so many environmental information systems ?’. I have used the word ‘assertions’ as the underlying principles seem to be universally accepted and taken for granted. This is especially true for the 3 core assumptions (assertions 1-3 below).
- Sound knowledge, reliable information and accurate data are vital for good environmental decision making.
- Within the framework of sustainable development, all stakeholders should take part in the decision making processes. A direct result of this is a call for improved public participation in environmental decision making.
- Environmental information is exceptionally well suited to GIS (and vice versa). GIS development is closely related to developments in environmental research, and GIS output is considered to be highly advantageous in understanding and interpreting environmental data.
- (Notice that this is emerging from combining 1 and 2) To achieve public participation in environmental decision making, the public must gain access to environmental information, data and knowledge.
- (Based on 1 and 3) GIS use and output is essential for good environmental decision making.
- (Based on all the others) Public Environmental Information Systems should be based on GIS technologies. Such systems are vital for public participation in environmental decision making.
Intriguingly, the Eye on Earth White Paper notes ‘This is a very “Geospatial” centric view; however it does summarise the broader principles of Environmental Information and its use’. Yet, my intention was not to develop a ‘Geospatial’ centric view – I was synthesising what I have found, and the keywords that I have used in the search did not include GIS. Therefore, the framework should be seen as an attempt to explain the reason that GIS is so prominent.
With this framework in mind, I have noticed a change over the past decade. Throughout the summit, GIS and ‘Geospatial’ systems were central – and they were mentioned and demonstrated many times. I was somewhat surprised how prominent they were in Sha Zukang speech (He is the Undersecretary General, United Nations, and Secretary General Rio +20 Summit). They are much more central than they were when I carried out the survey, and I left the summit feeling that for many speakers, presenters and delegates, it is now expected that GIS will be at the centre of any EIS. The wide acceptance does mean that initiatives such as the ‘Eye on Earth Network’ that is based on geographic information sharing is now possible. In the past, because of the very differing data structures and conceptual frameworks, it was more difficult to suggest such integration. The use of GIS as a lingua franca for people who are dealing with environmental information is surely helpful in creating an integrative picture of the situation at a specific place, across multiple domains of knowledge.
However, I see a cause for concern for the equivalence of GIS with EIS. As the literature in GIScience discussed over the years, GIS is good at providing snapshots, but less effective in modelling processes, or interpolating in both time and space, and most importantly, is having a specific way of creating and processing information. For example, while GIS can be coupled with system dynamic modelling (which was used extensively in environmental studies – most notably in ‘Limits to Growth’) it is also possible to run such models and simulations in packages that don’t use geographic information – For example, in the STELLA package for system dynamics or in bespoke models that were created with dedicated data models and algorithms. Importantly, the issue is not about the technical issues of coupling different software packages such as STELLA or agent-based modelling with GIS. Some EIS and environmental challenge might benefit from different people thinking in different ways about various problems and solutions, and not always forced to consider how a GIS play a part in them.
At the beginning of May, I gave a lecture at the UCL Interaction Centre (UCLIC) seminar titled ‘Interacting with Geospatial Technologies – Overview and Research Challenges’. The talk was somewhat similar to the one that I gave at the BCS Geospatial SIG. However, I was trying to answer a question that I was asked during a UCLIC seminar in 2003, when, together with Carolina Tobón, I presented the early work on usability of GIS for e-government applications. During that talk, the discussion was, as always is in UCLIC, intensive. One core question that remained with me from the discussion was: ‘What makes geospatial technology special or is it just another case of a complex and demanding information system that you should expect difficulties with and spend time to master?’
Over the years, I have been trying to improve the answer beyond the ‘it’s special because it’s about maps‘ or ‘geospatial information comes in large volumes and requires special handling‘ or similar partial answers. In the book Interacting with Geospatial Technologies different chapters deal with these aspects in detail. During the talk, I tried to cover some of them. In particular, I highlighted the lag of geospatial technologies behind other computing technologies (an indication of complexity), the problems of devices such as SatNavs that require design intervention in the physical world to deal with a design fault (see image), and the range of problems in interfaces of GIS as were discovered in the snapshot study that was carried out by Antigoni Zafiri.
There was an excellent discussion after the presentation ended. Some of the very interesting questions that I think need addressing are the following:
- In the talk, I highlighted that examples of spatial representations exist in non-literate societies, and that, therefore, the situation with computers, where textual information is much more accessible than geographical information, is something that we should consider as odd. The question that was raised was about the accessibility of these representations – how long does it take people from the societies that use them to learn them? Is the knowledge about them considered privileged or held by a small group?
- For almost every aspect of geospatial technology use, there is some parallel elsewhere in the ICT landscape, but it is the combination of issues – such as the need for a base map as a background to add visualisation on top of it, or the fact that end users of geospatial analysis need the GIS operators as intermediaries (and the intermediaries are having problems with operating their tools – desktop GIS, spatial databases etc. – effectively) – that creates the unique combination that researchers who are looking at HCI issues of GIS are dealing with. If so, what can be learned from existing parallels, such as the organisations where intermediaries are used in decision making (e.g. statisticians)?
- The issue of task analysis and considerations of what the user is trying to achieve were discussed. For example, Google Maps makes the task of ‘finding directions from A to B’ fairly easy by using a button on the interface that allows the user to put in the information. To what extent do GIS and web mapping applications help users to deal with more complex, temporally longer and less well-defined tasks? This is a topic that was discussed early on in the HCI (Human-Computer Interaction) and GIS literature in the 1990s, and we need to continue and explore.
In my talk I used a slide about a rude group in Facebook that relates to a specific GIS package. I checked it recently and was somewhat surprised to see that it is still active. I thought that it would go away with more recent versions of the software that should have improved its usability. Clearly there is space for more work to deal with the frustration of the users. Making users happy is, after all, the goal of usability engineering…
18 January, 2011
Yesterday, for the first time, I came across the phrase ‘GIS Systems’ in an academic paper, written by geographers (not GIS experts). I have also noticed that the term is being used more often in recent times when people talk about packages such as ArcGIS or Mapinfo.
On the face of it, talking about a ‘GIS System’ is ridiculous – how can you say ‘geographic information system system’? However, people have a reason for using this phrase and it makes some sense to them.
Maybe the reason is that GIS now stands for a class or type of computer software that can manage, manipulate and visualise geographic information, so GIS system is the specific hardware and software that is used. Personally, I’ll continue to find it odd and use GIS for what it is…
10 November, 2010
These are the slides from the presentation that I gave to the BCS Geospatial SG.
The talk abstract is:
Here is a useful party trivia: as a form of human communication, maps pre-date text by thousands of years – some early spatial depictions are 25,000 years old, whereas writing emerged only 4000 years ago. When it comes to computing, the reverse is true: the first wide use of computing is from the early 1950s, whereas the first effort to create a GIS only started in 1966. There are good reasons for this, chief among them is the complexity of handling geographical information in digital computers. An adverse impact of this challenge is that for many years geospatial technologies developers focused on functionality and not on the interaction with end-users. The result of this focus is that while word processors and spreadsheets became popular in the early 1980s, only with the emergence of ‘Web Mapping 2.0′ in 2005, GIS and geospatial technologies became more popular, albeit far from universally usable.
The talk covered interaction and user aspects of geospatial technologies, pointing to issues that permeate the usability and usefulness of geographical information itself (e.g. why ESRI shapefile is a popular format despite its drawbacks?), the programming of geospatial technology (e.g. why OGC WMS did not spark the mashup revolution, while Google Maps API did?) and the interaction of end users with desktop and web-based GIS.
And the talk happened at the same day in which the excellent Third Workshop on the Usability of Geographic Information was running at the Ordnance Survey.
One of the surprises of the Ordnance Survey OpenData release at the beginning of April was the inclusion of the Code-Point Open dataset, which lists the location of all postcodes in England, Wales and Scotland. This was clearly a very important dataset because of the way postcode geography drives many services and activities in the UK. Before the release, the costs of using postcodes in geographical analysis were prohibitive for many small organisations.
So how usable is this free Code-Point data? The principle of ‘do not look a gift horse in the mouth’ doesn’t apply here. The whole point of releasing the data is to make it as useful as possible to encourage innovation, so it should be made available in a way that makes it easy to reuse. I evaluated it while analysing a dataset of 11,000 volunteers’ postcodes that I received from a third sector organisation.
The download process is excellent and easy, apart from the fact that there is no clear and short description of the products in a non-technical manner next to each product. To find a description, you need to go to the product page – so you are at least 2 clicks away from the product details. It would be better to have a link from each product and include a brief description in the download page. We will see in a second why this is important…
The next step was the download itself and the opening of the zip file, which was clear and easy. There is an oddity with all Ordnance Survey data that they have a redundant sub-directory in them – so in this case the data resides under \codepo_gb\Code-Point Open\ . The fact that the files is broken up into postcode area instead of one big file of 157MB is fine, but it can be helpful to remind users that they can concatenate files using simple commands – this is especially necessary to less tech-savvy users. So an explanation for Windows users that you can open the Command window using ‘cmd.exe’ and run ‘type a.csv b.csv > common.csv’ can save some people plenty of time.
But the real unpleasant surprise was that nowhere in the downloaded package is there a description of the fields in the files! So you open the files and need to figure out what the fields are. The user manual is hides 4 clicks away from the download page and luckily I knew that the ‘user manual’ is stored under ‘technical information’ on the product page, which is not that obvious at first visit. Why not deliver the user manual with the product ?!? The Doc directory is an obvious place to store it.
The user manual reveals that there are 19 fields in the file, of which 9 (half!) are ‘not available in Code-Point Open’ – so why are they delivered? After figuring out the fields, I created a single line that can be attached to the files before importing them to a GIS:
Postcode,Positional Quality,PR Delete,TP Delete,DQ Delete,RP Delete,BP Delete,PD Delete,MP Delete,UM Delete,Easting,Northing,Country,Regional Health Authority,Health Authority,County,District,Ward,LS Delete.
Of course, all the fields with ‘Delete’ in the name mean that they should be deleted once imported.
Interestingly, once you delete these fields, the total size of Code-Point Open drops from 157MB to 91MB – which means that it can save the Ordnance Survey bandwidth and carbon emissions by making the file smaller.
Another interesting point is that the user manual includes detailed instructions on how to change the postcode to a ‘single spaced postcode’. The instructions are for Excel, Mapinfo and ArcGIS. This is the type of information that can help end-users start using the data faster. Finally, you can use this wonderful information to create lovely maps.
All these problems are minor, apart from the description of the fields which is a major usability error. Similar analysis can be carried out for any of the Ordnance Survey datasets, to ensure that they are useful to their users. There are some easy improvements, such as including the user manual with the distribution, and I’m sure that, over time, the team at the Ordnance Survey will find the time to sort these issues.
22 February, 2010
The question from Jeremy Morley ‘An often quoted figure estimates that 80% of information contains some geographic reference.’ – anyone got the source reference for this?! led me to search for an answer. This assertion is indeed often quoted in governmental documents, academic papers and trade magazines.
So, what is the source? While V1 magazine suggests that it links to a magazine article from 1992, a search on Google Scholar shows that William Huxhold’s 1991 book ‘An Introduction to Urban Geographic Information Systems’ is mentioned when this factoid is used. For example, here, here or here, although the last one includes an independent assessment that uses an 80% value.
Let’s look at what was said in the original book, on pages 22-23:
‘A 1986 brochure (Municipality of Burnaby) published by the Municipality of Burnaby, British Columbia, reported the results of a needs analysis for an urban geographic information system (GIS) in that municipality: eighty to ninety percent of all the information collected and used was related to geography.’
On page 236, the following statement can be found:
‘Chapter 1 reported that 80-90 percent of all the information used by local government is related to geography.’
And the latter is probably the source of the famous statement. So for about 20 years, the GIS community has been using a powerful assertion which is actually based on a brochure and not on a rigorous analysis of evidence. Maybe, as John Fagan suggested, it wasn’t a good idea to look too closely!