Recent diary entries
The Mexican statistical institute INEGI opened their data last November, terms are now compatible with OpenStreetMap. My colleague Rub21 has rendered out a first layer for mapping - take a look at our blog.
Mapear con los nuevos datos abiertos de México
En Noviembre el Instituto de Estadística y Geografía de México (INEGI) abrió sus datos. Los nuevos términos son compatibles con OpenStreetMap.
Red Nacional de Carreteras de INEGI
Eu fiz alguns testes e compartilho os resultados. → Acesse o mapa e confira: http://www.projetorgm.com.br/map/
Nota: No momento o mapa só destaca elementos mapeados como pontos.
Conheça também o projeto: http://pois.elblogdehumitos.com.ar/
I did some testing and share the results. → Access the map: http://www.projetorgm.com.br/map/
Note: In moment the map highlights elements mapped as points only.
Also visit the project: http://pois.elblogdehumitos.com.ar/
My first entry. Made road corrections to an area I know very well. Looking forward to participating in this effort.
Since the State of the Map in Buenos Aires, Ive been able To try out some possible indicators, I tried out a dataset for my home region Flanders. Here's some examples of things to measure.
The nodes table contains all POI's defined as nodes, but also all the nodes that make up the lines and closed lines (polygons) of Openstreetmap. We can reasonably assume that almost all untagged nodes will be part of lines or polygons. Some tagged nodes are also part of lines. For example, a miniroundabout, a ford, a barrier, etc, should always be part of a line.
The total number of nodes is made up almost completely made up of nodes that belong to something else. That's to be expected of course.
Over time the number of tagged nodes increases. But the number of tags on these nodes increases faster. In 2009, there were on avarage only 1,24 tags on the nodes, now it's over twice as many.
What gets tagged? Here's a quick breakdown in some very wide categories. Road info are all the kind of tagged nodes you'd expect on highways, the kind that adds to better routing and safer driving. POI's are things like banks, schools, fuel stations, etc. These two take top spots, but in 2014 there was a big jump in the first group.
Infrastructure nodes like those belonging to railways and high tension electricity lines are only recently being overtaken by address nodes. The release of open data about addresses in Flanders is probably the cause of the big jump. However, most addresses are tagged on buildings, so they do not show up here. For POI statistics, it would be best to just take the sum of nodes and points for the same tag combinations. Two problems arrise. One is practical: there seems to be something wrong with the way the history importer handles polygons. It might have to do with the lack of support for relations, but I don't know yet. One more thing for the to investigate list. The second problem is that sometimes the same POI has both a polygon and a node tagged with the same information. This is not good practice, but it happens. You could remove nodes that geographically fall within polygons if the tags are the same. But I wouldn't know how to do that in my setup. It zould take a lot of processing as well. And my available processing power at the moment is way too small as it is.
On to lines. In most cases, the thing to measure is the length of these. The absolute number of lines is mostly unimportant. A river is a river, wether it consist of 10 or a 100 bits and îeces. A nice example of how crowdsourcing works in practice is the evolution of the waterway network. First we see a quick growth of the river network (length in km). As the growth of the rivers winds down and stops, we see the streams taking off. So the crowd has finished mapping all the rivers, and only when that is finished, the smaller streams get more attention. Rivers are sometimes mapped as polygons too. Normally the lines are not deleted as this happens, so on network completion this has no impact. Of course the level of detail does increase. A way to measure the detailedness of the river network, could be to count the nodes of all lines and polygons making up this network.
A similar picture for roads. Main roads (tertiary to motorway) start of as the largest category. Minor roads (residential, unknown, unclassified) follow but overtake them quickly. Full network completion seems to be achieved by 2013-2014. Other roads (mostly service roads) grow slower, and steady. Just like "slow roads" (mostly footways etc) the steady growth seems to indicate that it is either more or lower priority work to complete this network. So these might keep growing for many years to come.
Network completion isn't everything of course. A lot of extra information is needed to have a good, rouatable map. This kind of infor is often mapped as tagged nodes on the map. The history importar does not load realtions unfortunately, so the number of turn restrictions can't be counted with my method. In the graph we compare the growth of road info nodes with the evolution of the road network. Again, first the basics get mapped, only as the first prioirty nears completion, real progress is made on the extra's.
So why do we need global statistics like this? To learn if these are general patterns. To see if imports disrupt these patters. Or if they only occur when population density and wealth is high enough. To see how complete maps are - just looking at the graphs, you can often see which features are mapped completely and which aspects of the map need more work. Based on the files generated in the process, it's not very hard to classify mappers: are they local, do they have local knowledge or are they probably remote mappers. The distribution of these is good to know, but more than that might give important insights. What happens when remote mappers reach road network completion? Does this increase the chance a good number of local mappers pick up the mapping that needs local knowledge? That might inform if and when remote mapping should be encouraged - or avoided. A lot of these issues give rise to heated arguments. Wouldn't it be nice to have some data to corroborate opinions?
As I said before, there is a lot left to be done. At State of the Map in Buenos Aires I got many tips on how to move ahead. And that has been quite helpful. I could for example never have imagined how incredibly simple it was to add length and area to lines and polygons. As old problems get solved, new ones show up. I just found out that the number of adresses in my polygon analysis is way smaller than other peoples results. SO there goes another day in finding out what goes wrong.
So even though my set-up is still not really finished for a more complete analysis, it would be nice to start some basic worldwide analysis (see the links at the start of my previous post on the subject) available soon. For those who don't know my little project, the idea is to provide these kind of statistics in an interactive platform, making them available for every region, every country, every continent and the whole world. There's also a video available (which I daren't watch yet) of me mumbling through the idea at State of the Map.
One little detail: my computer can't really handle the denser regions. Flanders was on the limit of what I can do. And there are much larger areas which are just as dense. So if you can spare a little server, I'd be happy to use it :)
Checking and editing of the roads we passed during our trip to South Africa has been completed.
Abbiamo appena iniziato una minuziosa mappatura di un terreno di proprietà dell'IRE di Venezia nella zona Chiesa di S. Erasmo.
We began today the serious mapping of Sukadana, KalBar, Indonesia by staff at ASRI. Thanks to jrpepper for the original digitization from MapBox. Now Agus has started driving all the roads with his GPS and is remapping the roads based on his traces, and naming them all. This work will help our in-house GIS system, and hopefully be useful for others.
Цель - все здания, улицы, дороги, общественные сооружения и т.д. всех городов Родины перенести на карту с тем, чтобы людям было удобнее. Общественно полезная миссия. Прошу поддержать.
I made a proposal/summary for mapping of campings at the OSM wiki page for campings.
Dia 21 de Fevereiro é o Open Data Day, um dia em que acontecerão eventos em todo o mundo com objetivo de difundir o conceito e a utilização de dados abertos.
O Calango Hacker Club está organizando o evento em Brasília e convidou a comunidade OpenStreetMap para participar. Estaremos presentes no evento com uma palestra de 20 minutos e uma oficina/maratona de mapeamento.
Quem tiver interesse em aprender a mapear, é a oportunidade perfeita para aprender. Quem já sabe, tem a oportunidade de ensinar, conhecer outros mapeadores e se divertir mapeando algo em conjunto. Cada um pode levar uma sugestão de tema ou local a ser mapeado por imagem de satélite e lá decidimos o que fazer.
O evento será realizado no 2º andar do Edifício Talento (ver mapa), das 14 às 18 horas. Quem puder, leve notebook!
Review of roads travelled in Oman during our trip from the Netherlands to South Africa has been completed. See De einder voorbij.
Come fare per importare dati massivi su mappe di Open Street Map? Grazie
adicionados duas áreas e um ponto: * + sefaz barra do ceará, barra do ceará * + praça da imprensa, aldeota * + Praça Arquiteto Rogério de Sousa Froes, aldeota
Hallo, ich hab diese Woche * ein paar Hausnummern eingetragen und * ein paar Gebäude gezeichnet.
Gibt es so was wie ein Review, damit ich sicher sein kann, dass das was ich mache auch richtig so ist? Ich bin nämlich neu hier.
Es gibt in meiner Gemeinde (Hörgertshausen) noch jede Menge einzutragen.
viele Grüße und Danke GeorG
Wystartował projekt dla Andrychowa - miasta oraz gminy
Szerzej w artykule - zobacz
Um möglichst vielen Mappern aus der Region die Möglichkeit zu geben an dem Treffen teilzunehmen haben wir uns dieses mal in Wernigerode getroffen. Besonders haben wir uns über den Besuch zweiter Vertreter des Harzklub e.V. gefreut. Folgende Themen wurden Diskutiert:
- Unterstützung neuer User aus der Region
- OpenData der Gemeinden im Harz
- Mögliche gegenseitige Unterstützung von Harzklub und lokalen Mappern
- Erfassen Topographischer Features
- bessere Vernetzung der Mapper untereinander
Made small changes to NIU's campus and improved the shoreline for Magician Lake.
I'm learning this along with the students in my lab. Hello students!
Very funny this conversation on twitter:
OrdnanceSurvey, like the IGN in France, despises OSM amateur cartographs but is calling for amateur (and free) photographers to illustrate their new printed maps ... "Do what we say, not what we do"
Fiz uma releitura do mapa e passei a usar Mapbox. O mapa é um projeto piloto e pode evoluir para qualquer coisa.
A ideia desse mapa é navegar pelo mapa do OpenStreetMap e ao mesmo tempo apontar para outras visualizações e projetos como ver fotos no Mapillary, rotas no OSRM, ver em 3D no F4 Map, editar e contribuir com o OpenStreetMap e outras.
A intenção é também acima de tudo testar e compartilhar os resultados do que se pode fazer com OpenStreetMap.
O projeto é de código aberto e pode ser conferido aqui http://www.projetorgm.com.br/mapa-regional/