Hi,
If you want to do is fast, try sortshp and sort your shapefile by your
attribute http://mapserver.org/utilities/sortshp.html. It should work well if
one attribute is enough for sorting and in some cases it may be possible to get
a usable result by sorting the sorted shapefile again by another attribute.
More flexible would be to import the shapefile into database, for example
Spatialite, create index the attributes needed for sorting and use ORDER BY in
the LAYER DATA. It may also be possible to connect your shapefile directly
through OGR and use SQL in the same way in the DATA line somehow like
CONNECTIONTYPE OGR
CONNECTION "full/path/to/test.shp"
DATA "SELECT * from test ORDER BY attribute"
This is probably the slowest alternative. I have not a tested example available
and I do not know if this works really.
-Jukka Rahkonen-
Jesper Kempe wrote:
Hi
I have a shapefile with quite many points in. Several of the points are very
close or even on the same locations. Every point has some attributes and some
of the points are more important than others (based on a attributes value).
What I am trying to do, and not succeding in, is to have points with attribute
x=Y drawn ontop of everything else.
Now I have a layer definition with the classes I want to have "in the bottom of
the image" first and the most important last. Each with an expression matching
a certain attribute. But it looks like the only order that matters is the order
in which the points in the shapefile are listed.
>From the mapfile:
TILEITEM "location"
TILEINDEX "shapefile.idx.shp"
SIZEUNITS meters
CLASSITEM "GEOM_TYPE"
CLASS
NAME "clouds"
EXPRESSION "clou"
COLOR 186 186 186
SYMBOL "mapinfo-sym-32"
SIZE 1200
END
CLASS
NAME "no_d"
EXPRESSION "no_d"
COLOR 0 0 0
SYMBOL "mapinfo-sym-32"
SIZE 1200
END
CLASS
NAME "subs"
EXPRESSION "subs"
COLOR 255 255 0
SYMBOL "mapinfo-sym-32"
SIZE 1200
END
CLASS
NAME "surfs"
EXPRESSION "surf"
COLOR 246 112 38
SYMBOL "mapinfo-sym-32"
SIZE 1200
END
Anyone has a tip on how I can get the desired effect?
//Jesper
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