Most explanations of topical authority maps treat them as visual flair — a diagram you draw after the strategy is decided, to communicate it to a stakeholder. That gets the order backwards. The map is what decides the strategy. Once you can see the topic graph, you stop guessing which page to write next, because the gap that needs the page is visible on the map.
What the Map Shows
A topical authority map has four layers, each surfacing a different decision you have to make.
1. Entities (nodes)
Every node is a concept the topic implies — a constituent entity that pages can be written about. Node size encodes centrality: how connected the entity is to the rest of the cluster. The central entity (the canonical reference) is the largest node. Perimeter entities are smaller. The edge of the cluster is where node size drops below a threshold the map makes visible.
2. Co-occurrence (edges)
Every edge is a co-occurrence: two entities that appear together in search queries, SERP results, or existing content on the topic. Edge weight encodes how often the pair co-occurs. Heavy edges are semantically locked-in pairs; light edges are occasional connections. The structure of the edges reveals which clusters exist and where their boundaries fall.
3. Coverage (color)
Each node is colored by whether it has a dedicated canonical page on the site: covered in indigo, partial in amber (the entity is mentioned but does not have a canonical page), uncovered in grey. The grey nodes near the cluster center are the highest-priority publishing targets. The grey nodes on the perimeter are the citation-capture opportunities.
4. Bridges (cross-cluster edges)
Edges that exit one cluster and enter another show where bridges to adjacent topics belong. These are the high-betweenness edges — pages that link the topic to an adjacent topic explicitly. The map marks them as priority candidates because they are the highest-citation surface in cross-cluster AI answers.
Two Views: Current vs Target
A useful topical authority map switches between two views.
The current view shows what is covered today — the existing pages on the site, their internal links, the entities they canonicalize. This view diagnoses. Coverage gaps appear as grey regions. Definitional drift appears as inconsistent labels on nodes that should be the same entity. Single-point-of-failure bridges appear as clusters connected by exactly one edge.
The target view shows what coverage will look like after the publishing plan executes. Pages to write are added as planned nodes; bridges to build are added as planned edges. This view plans. Editorial calendar decisions become “which planned node turns real next.” The order is decided by the map, not by keyword volume.
The gap between the current view and the target view is the editorial calendar.
How to Build a Topical Authority Map
Three options, in increasing order of fidelity.
By hand (small topics)
For a topic with a perimeter of fewer than 20 entities, the map is buildable in a spreadsheet plus a mind-mapping tool. List the entities, mark co-occurrences from manual SERP review, color each by coverage, and lay them out visually. Cost: a few hours. Limitation: misses long-tail entities that appear in real search demand but not in obvious places.
From a keyword tool export
Export the related-queries list from Ahrefs, Semrush, or Google Search Console for the head term and a handful of variations. Cluster the keywords manually or with a basic clustering tool. Build the network from the keyword co-occurrences. Cost: a day or two. Limitation: keyword tools surface what people type, not what they mean — the entity layer is inferred rather than measured directly.
From a knowledge graph
Build the map from a co-occurrence graph of search queries, SERP entities, and existing content. This is what KeywordGraph does natively: import a seed query, the tool runs the search demand graph, the SERP graph, and the content gap overlay automatically. The map comes out structured and editable, with coverage marked against the site you import. Cost: a few minutes. Limitation: requires the tool.
Try the KeywordGraph topical authority map on your own site — the free trial includes the full graph build and the gap analysis.