topojson包已被弃用。以下步骤基于命令行制图工作流程。这些界面更加灵活，但使用起来稍微复杂一些。
安装依赖项：
npm install d3-dsv ndjson-cli
将node_modules/.bin目录添加到路径中，以便您可以轻松运行命令：
PATH=$(npm bin):$PATH
将tsv文件转换为换行符分隔的json文件：
tsv2json data.tsv -n > data.ndjson
{"id":"1","code":"AL","name":"Alabama"}
{"id":"2","code":"AK","name":"Alaska"}
将id列解析为数字：
ndjson-map '{id: +d.id, code: d.code, name: d.name}' < data.ndjson > data_parsed.ndjson
{"id":1,"code":"AL","name":"Alabama"}
{"id":2,"code":"AK","name":"Alaska"}
提取 topojson 文件的几何信息：
ndjson-cat topojson.json | ndjson-split 'd.objects.states.geometries' > topojson_geometries.ndjson
{"type":"Polygon","arcs":[[0]],"properties":{"code_2":"AK"}}
{"type":"Polygon","arcs":[[1]],"properties":{"code_2":"AL"}}
将两个以换行符分隔的json文件合并：
ndjson-join 'd.properties.code_2' 'd.code' topojson_geometries.ndjson data_parsed.ndjson > geometries_data_join.ndjson
[{"type":"Polygon","arcs":[[0]],"properties":{"code_2":"AK"}},{"id":2,"code":"AK","name":"Alaska"}]
[{"type":"Polygon","arcs":[[1]],"properties":{"code_2":"AL"}},{"id":1,"code":"AL","name":"Alabama"}]
将名称列添加到topojson属性中，仅保留topojson几何图形：
ndjson-map 'd[0].properties.name = d[1].name, d[0]' < geometries_data_join.ndjson > geometries_data_merge.ndjson
{"type":"Polygon","arcs":[[0]],"properties":{"code_2":"AK","name":"Alaska"}}
{"type":"Polygon","arcs":[[1]],"properties":{"code_2":"AL","name":"Alabama"}}
将之前的结果转换为数组，并将其与原始的topojson文件连接起来：
ndjson-join <(ndjson-cat topojson.json) <(ndjson-reduce < geometries_data_merge.ndjson) > topojson_concat.ndjson
[{
"type": "Topology",
"transform": {
"scale": [0.0015484881821515486, 0.0010301030103010299],
"translate": [-5.491666666666662, 41.008333333333354]
},
"objects": {
"states": {
"type": "GeometryCollection",
"geometries": [{
"type": "Polygon",
"arcs": [[0]],
"properties": {
"code_2": "AK"
}
}, {
"type": "Polygon",
"arcs": [[1]],
"properties": {
"code_2": "AL"
}
}
]
}
},
"arcs": [[[2466, 9916], [-25, -5], [3, -13]], [[2357, 9852], [1, -2], [1, -2]]]
}, [{
"type": "Polygon",
"arcs": [[0]],
"properties": {
"code_2": "AK",
"name": "Alaska"
}
}, {
"type": "Polygon",
"arcs": [[1]],
"properties": {
"code_2": "AL",
"name": "Alabama"
}
}
]
]
覆盖原始的topojson文件几何信息，并将其保存为普通的json文件：
ndjson-map 'd[0].objects.states.geometries = d[1], d[0]' < topojson_concat.ndjson > topojson_data.json
{
"type": "Topology",
"transform": {
"scale": [0.0015484881821515486, 0.0010301030103010299],
"translate": [-5.491666666666662, 41.008333333333354]
},
"objects": {
"states": {
"type": "GeometryCollection",
"geometries": [{
"type": "Polygon",
"arcs": [[0]],
"properties": {
"code_2": "AK",
"name": "Alaska"
}
}, {
"type": "Polygon",
"arcs": [[1]],
"properties": {
"code_2": "AL",
"name": "Alabama"
}
}
]
}
},
"arcs": [[[2466, 9916], [-25, -5], [3, -13]], [[2357, 9852], [1, -2], [1, -2]]]
}
所有命令都在一行中：
ndjson-join <(ndjson-cat topojson.json) <(ndjson-join 'd.properties.code_2' 'd.code' <(ndjson-cat topojson.json | ndjson-split 'd.objects.states.geometries') <(tsv2json data.tsv -n | ndjson-map '{id: +d.id, code: d.code, name: d.name}') | ndjson-map 'd[0].properties.name = d[1].name, d[0]' | ndjson-reduce) | ndjson-map 'd[0].objects.states.geometries = d[1], d[0]' > topojson_data.json
注：
- 我在topojson文件中交换了“AK”和“AL”，以检查连接是否真正起作用。
- 最后一条命令（在单行命令之前）仅适用于原始输出，而不适用于给定的漂亮打印版本，其中包含换行符。
- 我在Linux子系统上测试了工作流程，因为目前ndjson-map在Windows上似乎无法正常工作。
