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Option to snap low zooms to a stairstep grid

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Eric Fischer
2016-11-28 15:45:38 -08:00
parent c68d553e94
commit 0db8d9ed8b
7 changed files with 95 additions and 3 deletions
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@@ -160,6 +160,8 @@ which may not be what you want.
\-ad or \-\-drop\-fraction\-as\-needed: Dynamically drop some fraction of features from each zoom level to keep large tiles under the 500K size limit. (This is like \fB\fC\-pd\fR but applies to the entire zoom level, not to each tile.)
.IP \(bu 2
\-an or \-\-drop\-smallest\-as\-needed: Dynamically drop the smallest features (physically smallest: the shortest lines or the smallest polygons) from each zoom level to keep large tiles under the 500K size limit. This option will not work for point features.
.IP \(bu 2
\-aL or \-\-grid\-low\-zooms: At all zoom levels below \fImaxzoom\fP, snap all lines and polygons to a stairstep grid instead of allowing diagonals. You will also want to specify a tile resolution, probably \fB\fC\-D8\fR\&. This option provides a way to display continuous parcel, gridded, or binned data at low zooms without overwhelming the tiles with tiny polygons, since features will either get stretched out to the grid unit or lost entirely, depending on how they happened to be aligned in the original data.
.RE
.SS Doing less
.RS