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Add a filter extension to allow filtering individual attributes

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Eric Fischer
2018-06-18 11:26:22 -07:00
parent 54983c7536
commit 8d6bd4e10f
9 changed files with 148 additions and 72 deletions
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man/tippecanoe.1
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@@ -265,9 +265,22 @@ Example: to retain only major TIGER roads at low zoom levels:
.PP
.RS
.nf
\&./tippecanoe \-o roads.mbtiles \-j '{ "*": [ "any", [ ">=", "$zoom", 11 ], [ "in", "MTFCC", "S1100", "S1200" ] ] }' tl_2015_06001_roads.json
tippecanoe \-o roads.mbtiles \-j '{ "*": [ "any", [ ">=", "$zoom", 11 ], [ "in", "MTFCC", "S1100", "S1200" ] ] }' tl_2015_06001_roads.json
.fi
.RE
.PP
Tippecanoe also accepts expressions of the form \fB\fC[ "attribute\-filter", name, expression ]\fR, to filter individual feature attributes
instead of entire features. For example, you can exclude the road names at low zoom levels by doing
.PP
.RS
.nf
tippecanoe \-o roads.mbtiles \-j '{ "*": [ "attribute\-filter", "FULLNAME", [ ">=", "$zoom", 9 ] ] }' tl_2015_06001_roads.json
.fi
.RE
.PP
An \fB\fCattribute\-filter\fR expression itself is always considered to evaluate to \fB\fCtrue\fR (in other words, to retain the feature instead
of dropping it). If you want to use multiple \fB\fCattribute\-filter\fR expressions, or to use other expressions to remove features from
the same layer, enclose them in an \fB\fCall\fR expression so they will all be evaluated.
.SS Dropping a fixed fraction of features by zoom level
.RS
.IP \(bu 2