mapmaker

Introduction

echarts-mapmaker is derived from echarts-map-tool。mapmaker targets at echarts map developers, whereas echarts-map-tool is web-ui for downloading custom geoshapes from Gaode map.

Installation

npm install -g echarts-mapmaker

Feature highlights

UTF encode geojson

echarts accepts geojson but echarts team invented UTF8-encoded geojson format. UTF8-encoding is a loss compression with its precision adjustable. So far, it is only used in echarts. Similarly Topojson is created and advocated by the king of visualization, Mike Bostock. Both exists to solve the same problem: to reduce the size of fat geojson. In the internet era, the user experience is ruled by response time. The less the payload, the faster the rendering speed. For example，the standard 2017 uk voting map is 188 MB but after UTF8-encoding, the resulting size is 9.9 MB, 1:20 compression ratio.

UTF decode geojson

As afore-mentioned, UTF8 encoded geojson can only be used with echarts. Hence, the decoding facility is required to get standard geojson and echarts-mapmaker provides such a facility.

Please note: the encoding process is loss comporession

Simple map authoring: merge and split

mapmaker can merge a geojson feature into another geojson and can split all features of a geojson file into independent ones.