[talk-au] Specialised Garmin OSM Maps for country mapping

[Matt White]

Liz wrote:
> On Wed, 27 Feb 2008, Matt White wrote:
>   
>> Don't know if anybody is interested, but I have created a custom set of
>> Garmin IMG files for use when mapping missing roads out in rural areas.
>> They have the zoom levels altered so all road types are visible at the
>> 2km zoom level. The reason for these maps exist is because last weekend
>> I felt very smug with myself mapping some of the unmapped parts of the
>> Brisbane ranges (based on what I could see wasn't mapped on my GPS),
>> only to discover when I got home that it had already been done. It
>> turned out that my GPS did show those roads already mapped, but they
>> weren't visible until you zoomed in to 120m, and I had the GPS zoom set
>> to about 1.2km (which is far more useful a level when you are driving in
>> sparsely populated areas).
>>
>> They can be downloaded if you are interested from
>> http://www.osmaustralia.org/garmin2kzoom.php
>>
>> I've only tested them on a 60CSx - would be interested to see how they
>> fly on the other Garmins.
>>     
> etrex vista cx
> could see the (nsw) tracks at 500m zoom level and after 1.2km zoom couldn't 
> see anything
> the map is not as up to date as i hoped - hasn't got last tuesday's excursion 
> on it 
>
>   
Hmmm. Those maps *should* be updating nightly automatically (except 
Tuesday and Thursday mornings). I might have dodgyness in my scripts 
somewhere, but they are showing the correct creation date. It should be 
noted that the source data is taken from www.informationfreeway.org, not 
from the osm site directly, cos I can't rip a large enough chunk down in 
one hit from the OSM server. I'll have a crack at changing the data 
source to be the nightly change set instead and see if that improves things.

Regarding the zoom levels, it may be variations between the etrz and the 
60CSx that I'm testing on, or I could have cocked up the mkgmap features 
setup.

If you want to have a go generating the mkgmaps, all I did was modify 
the polyline|highway|xxx|nn rows to make the nn be 20 if nn was higher 
than 20.

eg:

polyline|highway|residential|0x06||20
polyline|highway|secondary|0x05||20
polyline|highway|service|0x07||20
polyline|highway|steps|0x16||20
polyline|highway|tertiary|0x06||20

The eTrex might have a different level set, so using 18 instead of 20 
might fix it. A little experimentation required :-)

Matt
> so i will learn how to fiddle the levels and stuff in mkgmap
> :-(
>
>
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