[Xastir] ESRI shapefiles and dbfawk

[Gerry Creager n5jxs]

I'll have to look, and likely it'll wait 'til I'm home from Qatar this 
weekend.

Sorry... while I have some of the resources, I'm 'way ahead on jetlag 
and not real efficient.

gerry

Tom Russo wrote:
> On Wed, Dec 15, 2004 at 11:04:37PM -0700, we recorded a bogon-computron collision of the <jewen at shaw.ca> flavor, containing:
> 
>>However, having the dbfawk file in place, it seems like the redraw map takes
>>longer than before. That makes sense, since now every element has to go
>>through the parsing before Xastir decides to draw it or not.
> 
> 
> Yep, I'd expect that.
> 
> 
>>Now I really have to figure out how to separate the roads into major
>>highways for the whole province, and then smaller more detailed sections
>>that are more reasonable than trying to parse out a 40 MB file to draw a 4
>>square mile section!
> 
> 
> This is where you're likely to see the most benefit of speed.  Chopping up
> the shapefile into shapefiles of smaller geographic regions will really help, 
> because xastir can exclude whole files just based on the index it builds.
> 
> I'm not familiar with any simple tools that can do this.  Perhaps Gerry can
> suggest one?
> 
> Your other option, of course, is to write a simple one using shapelib
> to pick through the shapes and only write out those that fall within a 
> certain geographic region, or which match particular DBF field values.
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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