[OZAPRS] Message Traffic and WX Alerts in Xastir

David djmunn at bigpond.com
Sat Nov 22 18:21:24 EST 2008

Hi Andrew.....started Xastir in a terminal as you suggested...
No DWFAWK signature for z_aus20no08.shp
i presume that it would be in the /usr/local/share/xastir/config dir
can i mod the US one or do i make a new one and how
 73 David VK4BDJ

Andrew Errington wrote:
>> Where I'm at. The sample file nwsc_ddmmyy.dbfawk contains exactly the
>> same field sequence as c_aus20on08.dbf so I renamed it to
>> c_aus20on08.dbfawk I did the same thing with z_aus20on08 and mz_aus13on08.
>> The last two had extra fields which I removed as per
>> readme.maps. I still have no polygons and I suspect it's due to errors in
>> my dbfawk files.
> If you start xastir in a console you'll see error messages printed if
> xastir cannot find the .dbfawk file that goes with the shapefiles.  Also,
> note that the .dbfawk files can go in one of two places, and their
> location dictates how they are used.
> I posted a link to Tom Russo's dbfawk howto already, but it seems to be
> the same as your link to the dbfawk howto on the xastir wiki.
>> There are two tools, dbfinfo and dbffields, in xastir but these have not
>> compiled. Tom makes mention of compiling them separately, in the wiki. I've
>> not had time yet to investigate this. Those tools enable one to compare a
>> dbf file with a dbfawk file; guess I'll find out tomorrow :-)
> dbffields is not a tool.  The tools are dbfinfo and testdbfawk.  It's not
> strictly necessary to have these for this step as you can do one of three
> things to get the list of files.
> 1) less *.dbfinfo
> Just dump the file to the console and look for a bunch of names at the
> beginning of the file.  You'll know them when you see them.
> 2) khexedit
> Same deal, but a hex editor doesn't barf when you open a binary file
> 3) QGis (most useful)
> Since we are using Linux we can easily get this rather nice GIS program,
> which will recognise and import shapefiles.  Once you have imported the
> shapefile you can look it its properties.
> * Start QGIS
> * Select Layer|Add a Vector Layer
> * Open one of your .dbf files
> * Marvel at how quickly xastir renders the same file
> * In the layers list on the left, right-click on the layer you just
> created and select Open Attributes.
> * Across the top of the table is the list of field names in order (ignore
> the 'id' field).  This list goes into the dbfinfo entry in the .dbfawk
> file (it is the 'signature' that xastir uses to match the .dbfawk file to
> a particular shapefile *if* the .dbfawk file is in the
> /usr/local/share/xastir/config.  If the .dbfawk files is in the same
> directory as the .dbf file it should have the same name.  For example
> foo.dbf and foo.dbfawk)
> dbffields is not a program.  The dbffields list in the .dbfawk file
> contains a subset of that list of fields, which are actually the ones you
> are interested in.
> I don't know for sure, but could it be that the attributes in the
> Australian files are named in lower-case?  Maybe .dbffawk files are
> case-sensitive?
>> Despite no progress I feel I've made progress.
> I can help a little, but I can't test it.  Or can I?  Can I get the
> Australian weather alert APRS feed here in NZ?
> 73,
> A
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