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Base64
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map
shaper
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Layers
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Source files
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Clip
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To shape
Frame
Bounds
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Delete
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Duplicate
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Bounds
Edit data
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Export options
Layers
File format
?
Enter options from the command line interface for the -o command. Examples: bbox no-quantization precision=0.001. Click to see all options.
choose output directory
save to clipboard
Export
Add basemap layer
Name (optional)
Option 1: Mapbox style URL and key
Option 2: raster tile URL template
TMS (reversed y-index)
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Display options
detect line intersections
show reference lines
Basemaps
Add
a basemap
Projections
Preview
Apply
Simplification
prevent shape removal
?
Prevent small polygon features from disappearing at high simplification. Keeps the largest ring of multi-ring features.
use planar geometry
?
Treat x, y values as Cartesian coordinates on a plane, rather than as longitude, latitude coordinates on a sphere.
Method
Douglas-Peucker
?
Simplified lines remain within a set distance of original lines. Good for thinning dense points, but spikes tend to form at high simplification.
Visvalingam / effective area
?
Lines are simplified by iteratively removing the point that forms the least-area triangle with two adjacent points.
Visvalingam / weighted area
?
Points located at the vertex of more acute angles are preferentially removed, for a smoother appearance.
Apply
Import files
with advanced options
Drop, paste or
select
files to import.
Shapefile, GeoJSON, TopoJSON, KML and CSV formats are supported. Files can be zipped or gzipped.
?
Enter options from the command line interface. Examples:
snap no-topology encoding=big5
. Click to see all options.
Submit
0 line intersections
Repair