On Jul 21, 2010, at 10:48 AM, Tom Hughes wrote: > On 21/07/10 09:26, Martijn van Exel wrote: > >> I started this because there seems no direct way to retrieve the full >> history for a particular area. What I am worried about is that this is an >> abuse of the API, so please advise if this is the case. > > Well it's certainly going to be rather expensive, so if people use it more > than occasionally or start scripting it to scrape larger area then we are > clearly going to have a problem. > > Generating extracts from the full history dump would be preferable - not sure > what the status of getting that setup is though. > > Tom >
For that reason I restricted the bbox size to a maximum of 5km. Of course someone could remove this limitation in the code quite easily. I realize that in urban / dense areas even 5km would mean a lot of requests so I want to build in a check once the initial map API request returns (maximum of a few thousand features or something). The use case for this program for me is being able to retrieve the history for a number of small areas easily, for analysis purposes related to my Crowd Quality research I talked about at SOTM. At SOTM I talked to Lars Francke about his history dump script that was run once or twice a few months ago. He said it would definitely be feasible to implement an extent parameter but that would require some significant rewriting effort. I am willing to look into this but it's in Java which is not my weapon of choice.. I would love to have a full history for a few larger areas at some point so it would make sense for me to implement this. Martijn van Exel +++ m...@rtijn.org Laziness – Impatience – Hubris http://schaaltreinen.nl twitter: mvexel skype: mvexel flickr: rhodes _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
