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diff --git a/viewer/js/limits.js b/viewer/js/limits.js
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+// limits.js — view limits shared by the views and the URL state (pure)
+import { R_KM } from './geo.js';
+
+export const CLEARANCE_M = 20;                        // the globe camera stays this far above the ground
+export const MIN_ALT = CLEARANCE_M / (R_KM * 1000);   // closest range in planet radii (street level)
+export const MAX_ALT = 5;
+export const MAX_ZOOM = 20000;
+export const MAX_PITCH = 80;                          // degrees from straight down
+export const MAX_EXAG = 5;                            // 3D terrain exaggeration