[Xastir] Xastir with offline maps

[Tom Russo]

On Fri, Jun 15, 2012 at 10:04:46AM -0700, we recorded a bogon-computron collision of the <curt.we7u at gmail.com> flavor, containing:
> On Tue, 12 Jun 2012, Lee Bengston wrote:
> 
> > If I zoom in much further, I get littered with text labeling what look
> > like POI's, and a red X precedes the text.  It looks like a dbfawk
> > tweak is in order for high zoom levels.
> 
> You can pick and choose the different maps in each block to get rid of features that you don't want to see.  I'll often delete the types I'm not interested in (in sets of three files:  *.SHP, *.DBF, *.IDX).

You can also set min/max zoom levels in  map properties for maps that get
too cluttered at high zoom levels (lots of POI maps are like that, and
become useless when zoomed too far out).  The other option is to explore
modifying the dbfawk file associated with the POI shapefile so it displays
different subsets of POI types at different zoom levels based on some 
attribute.  The OSM_cloudmade_poi dbfawk is already set up to recognize
different CATEGORY values, but right now does nothing with that --- it
is just a skeleton that could be improved greatly.  As it is now,
it displays every type of POI exactly the same way, at all zoom levels.

Each category *should* have a different symbol type (set the "symbol" variable 
to a standard APRS symbol specifier (table, symbol, overlay0, e.g. "/K " for a
school or "/H " for a "Lodging" symbol, or whatever), and "display_level"
to the highest zoom level for which that category can be shown.  But 
it's not done that way now.  

If someone were to experiment with the OSM_cloudmade_poi.dbfawk and submit a
modification of it, we'd commit it.


-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
 one trick, rational thinking, but when you're good and crazy, oooh, oooh,
 oooh, the sky is the limit!"  --- The Tick