Gathering detailed insights and metrics for mapshaper-simplify
Tools for editing Shapefile, GeoJSON, TopoJSON and CSV files
Installations
npm install mapshaper-simplifyDeveloper Guide
BETA
Typescript
Yes
Module System
CommonJS
Node Version
14.12.0
NPM Version
7.5.4
Releases
Unable to fetch releases
Contributors
1
Unable to fetch Contributors
Languages
4
JavaScript
CSS
HTML
TeX
JavaScript (98.95%)
CSS (0.66%)
HTML (0.39%)
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Developer
Download Statistics
Total Downloads
6,867
Last Day
10
Last Week
47
Last Month
292
Last Year
1,053
GitHub Statistics
2,642 Commits
1 Forks
1 Watching
6 Branches
1 Contributors
Maintainers
1
Package Meta Information
Latest Version
2.0.2
Package Id
mapshaper-simplify@2.0.2
Unpacked Size
101.13 kB
Size
35.58 kB
File Count
6
NPM Version
7.5.4
Node Version
14.12.0
Total Downloads
Cumulative downloads
Total Downloads
6,867
Last day
-50%
10
Compared to previous day
Last week
-50%
47
Compared to previous week
Last month
356.3%
292
Compared to previous month
Last year
-67.1%
1,053
Compared to previous year
Daily Downloads
Weekly Downloads
Monthly Downloads
Yearly Downloads
Dev Dependencies
28
Versions
Mapshaper geojson simplify
This is the geojson simplification method extracted directly from Mapshaper
Useage
1import { 2 preBuild, 3 simplify 4} from 'mapshaper-simplify' 5 6const res = await fetch('./__country.json') 7const geojson = await res.json() 8console.log(geojson) 9 10console.time('preBuild') 11const dataset = preBuild(geojson) 12console.timeEnd('preBuild') 13 14console.log(dataset) 15// console.log(JSON.stringify(dataset)) 16 17console.time('simplify') 18const geojson2 = simplify(dataset, 0.1) 19console.timeEnd('simplify') 20console.log(geojson2) 21 22// console.log(JSON.stringify(dataset)) 23// console.log(JSON.stringify(geojson2)) 24 25console.time('simplify') 26const geojson3 = simplify(dataset, 0.5) 27console.timeEnd('simplify') 28console.log(geojson3) 29 30// console.log(JSON.stringify(dataset)) 31// console.log(JSON.stringify(geojson3))
Why Bother?
It is important to keep topological relations among features when processing geographic data, which unfortunately, not promised in most simplification algorithms or GIS softwares like QGIS and ArcGIS.
The simplification process of Mapshaper handles the shared edges well enough in most cases.
However Mapshaper is not designed to be called programmatically on the fly. Nor to be light-weighted. The browser version of it is enormous with dependencies like buffer-es6 as polyfills since it's originaly designed to run in a node.js evirenment.
That's why I extracted the geojson simplification part and minify it as much as posible.
Caution!
The original Mapshaper is not programed friendly for tree-shaking so I have to use some very progressive minification method including JS coverage.
You have to USE IT EXACTLY LIKE OUR EXAMPLES. Or it won't work.
License
This software is licensed under MPL-2.0.
No vulnerabilities found.
No security vulnerabilities found.