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    <p>Try using this:</p> <pre><code>topojson -o final.json -e data.tsv --id-property=code_2,code -p code_2,state=name -- topojson.json </code></pre> <p>Which should output:</p> <pre><code>{ "type": "Topology", "transform": { "scale": [ 0.000016880209206372492, 0.000007005401010148724 ], "translate": [ -1.8418800213354616, 51.15278777877789 ] }, "objects": { "states": { "type": "GeometryCollection", "geometries": [ { "type": "Polygon", "arcs": [ [ 0 ] ], "id": "AK", "properties": { "code_2": "AK", "state": "Alaska" } } ] } }, "arcs": [ [ [ 0, 588 ], [ 92, -294 ], [ 91, -294 ], [ -183, 588 ] ] ] } </code></pre> <p>From the <a href="https://github.com/mbostock/topojson/wiki/Command-Line-Reference">Command Line Reference wiki</a>:</p> <blockquote> <p><strong>--id-property</strong> name of feature property to promote to geometry id</p> </blockquote> <p>By using the <code>code_2</code> property with this option, you promote it as the feature ID.</p> <blockquote> <p>Prepend a <strong>+</strong> in front of the input property name to coerce its value to a number.</p> </blockquote> <p>Plus:</p> <blockquote> <p>If the properties referenced by <strong>--id-property</strong> are null or undefined, they are <strong>omitted</strong> from the output geometry object. Thus, the generated objects may not have a defined ID if the input features did not have a property with the specified name.</p> </blockquote> <p>So, when you are using <code>+code</code> and <code>+code_2</code>, they are probably <code>undefined</code>, as you can't convert the <code>AK</code> string value to a number.</p> <blockquote> <p>Here, the input property "FIPS" is coerced to a number and used as the feature identifier; likewise, the column named "FIPS" is used as the identifier in the CSV file. (If your CSV file uses a different column name for the feature identifier, you can specify multiple id properties, such as <code>--id-property=+FIPS,+id</code>.)</p> </blockquote> <p>That's why you have to add the <code>code</code> to the <code>--id-property=code_2,code</code> option. This is how the mapping is made (the <code>code_2</code> from <em>topojson.json</em> and the <code>code</code> column from <em>data.tsv</em>).</p> <blockquote> <p>Then, the output property "unemployment" is generated from the external data file, unemployment.tsv, which defines the input property "rate"</p> </blockquote> <p>In our case, <code>-p code_2,state=name</code> specifies that we will preserve the <code>code_2</code> property and we will rename the <code>name</code> property to <code>state</code>. The <strong>Properties</strong> and <strong>External Properties</strong> sections in the aforementioned documentation wiki are pretty informative on the matter.</p>
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