[mapserver-users] pre-projection

[Paul Ramsey]

Bill,
Get the OGR library (you may have it already) and use the 'ogr2ogr'
utility. It'll read/write TIGER data. It'll also do reprojections. The
usage summary is this:

Usage: ogr2ogr [-skipfailures] [-f format_name]
               [-where restricted_where] [-spat xmin ymin xmax ymax]
               [-t_srs srs_def] [-a_srs srs_def]
               [[-dsco NAME=VALUE] ...] dst_datasource_name
               src_datasource_name
               [-lco NAME=VALUE] [-nln name] layer [layer ...]]

 -f format_name: output file format name, possible values are:
     -f "ESRI Shapefile"
     -f "TIGER"
     -f "MapInfo File"
     -f "PostgreSQL"
 -where restricted_where: Attribute query (like SQL WHERE)
 -spat xmin ymin xmax ymax: spatial query extents
 -dsco NAME=VALUE: Dataset creation option (format specific)
 -lco  NAME=VALUE: Layer creation option (format specific)
 -nln name: Assign an alternate name to the new layer
 -a_srs srs_def: Assign an output SRS
 -t_srs srs_def: Reproject/transform to this SRS on output

 Srs_def can be a full WKT definition (hard to escape properly),
 or a well known definition (ie. EPSG:4326) or a file with a WKT
 definition.


In Frank we trust...
Paul


Brian Hill wrote:
> 
> I have tiger data in geographic projection, and other data in a mercator
> projection.  My output projection is the mercator projection.  All the
> preceding is specified in my .map file.
> 
> Does one of the MapServer utilities allow me to pre-project all the
> tiger data into the same mercator projection so that the transformation
> doesn't have to be done on-the-fly?  If so, are there directions
> somewhere (something much more detailed than the discussion at
> http://mapserver.gis.umn.edu/coordinates.html ) that I can follow to do
> this operation?
> 
> My goal is to make my installation perform better, and I am hoping from
> previous posts to this list that this will be the ticket.  Thanks very
> much for any pointers. --Brian Hill

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     | Paul Ramsey
     | Refractions Research
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