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diff --git a/backend/hist_data/README.md b/backend/hist_data/README.md
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--- a/backend/hist_data/README.md
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@@ -27,6 +27,10 @@ This directory holds files used to generate the history database data.db.
- `event_disp`: <br>
Format: `id INT, scale INT, unit INT, PRIMARY KEY (id, scale)` <br>
Maps events to scales+units they are 'displayable' on (used to make displayed events more uniform across time).
+- `img_dist`: <br>
+ Like `dist`, but only counts events with images.
+- `img_disp`: <br>
+ Like `events_disp`, but only counts events with images.
- `images`: <br>
Format: `id INT PRIMARY KEY, url TEXT, license TEXT, artist TEXT, credit TEXT` <br>
Holds metadata for available images
@@ -84,3 +88,6 @@ Some of the scripts use third-party packages:
1. Additional events can be described in `picked/events.json`, with images for them put
in `picked` (see the README for details).
1. Can run `gen_picked_data.py` to add those described events to the database.
+
+## Generation Event Image Display Data
+1. Run `gen_disp_data.py img`, which adds the `img_dist` and `img_disp` tables.