NAME¶

sortshp - sort a Shape data set

SYNOPSIS¶

sortshp
[ infile outfile item [ascending | descending] | -v]

DESCRIPTION¶

sortshp sorts a Shape data set based on a single column in ascending or descending order. Supports INTEGER, DOUBLE and STRING column types. Useful for prioritizing shapes for rendering and/or labeling.

The idea here is that if you know that you need to display a certain attribute classed by a certain value, it will be faster for MapServer to access that value if it is at the beginning of the attribute file.

OPTIONS¶

infile

The name of the .shp file

outfile

The name of the .shp/.shx and .dbf files to create

item

Name of the field to sort on

ascending, descending

Sort order (default: ascending)

-v

Display mapserver version and build options.

EXAMPLE¶

This example uses a roads file ('roads_ugl') that has a field with road classes in integer format ('class1').

       sortshp roads_ugl roads-sort class1 ascending


      

Result:

Figure 1: Attributes Before sortshp
⟨http://mapserver.org/_images/sortshp-before.png⟩

Figure 2: Attributes After sortshp
⟨http://mapserver.org/_images/sortshp-after.png⟩

SEE ALSO¶

map2img(1), shptree(1), shptreetst(1), shptreevis(1)