[josm-dev] Download along track

[Shaun McDonald]

This is just awesome.

There is one problem that I've found so far. At the corners of the  
bboxes that are downloaded there isn't enough overlap so you get small  
sections of the track that don't have a lot of data around them. This  
is far more prevalent with parts of track that are heading NW/SE or  
even just NNW/SSE, as my tyipical journey to and from work takes me.

Shaun

On 19 Nov 2008, at 02:05, Frederik Ramm wrote:

> Hi,
>
>    I have finally gotten around to implementing a often-requested
> feature, namely the automatic downloading of data along a given GPS  
> track.
>
> The GPX layer menu has a new entry "download along track" which will
> compute a series of download rectangles along the given GPS track and
> download them for you one after the other.
>
> This feature is still very experimental and I would welcome input and
> programming support. You'll find detailed comments on how it works in
> the GPXLayer class. Some of the issues are:
>
> * buffer size/download size parameter dialog needs improvement
> * computing the "hull" of the GPX points takes too long
> * when download is running, insufficient information about progress,  
> and
> cancel button does not work
>
> I wonder if we could perhaps also achive a sort of "preview" of the  
> area
> to be downloaded. If we were to give the OSM data layer a generic  
> method
> to cycle through its data sources and re-download them all (this is
> another feature that has been asked for separately - a sort of  
> "refresh"
> function), then we could let the GPX layer create an empty OSM data
> layer that has an array of data sources as computed by the "download
> data laong track" code. That layer could then display the typical
> hatching pattern for the non-downloaded area and would serve as a
> preview of what area you would get if you trigger the download  
> function.
> You can then delete this "empty shell" layer if you're unhappy, or hut
> download to really get the data.
>
> Bye
> Frederik
>
> -- 
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09"  
> E008°23'33"
>
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