From e2ccac56ae9c8e8b087197c925c726281ae4fd7c Mon Sep 17 00:00:00 2001
From: Rudy Celekli <rudy@gradiahq.com>
Date: Wed, 4 Nov 2026 21:58:42 -0500
Subject: [PATCH] fix(perimeters): show a 0.25-acre fire as 0.25 ac, not 0 ac

The incident card rounded the WFIGS size to whole acres, so every fire
under half an acre read "0 ac". The live perimeter feed carries many of
these (0.01 to 0.37 acres). Sizes under one acre now keep the reported
hundredths.
---
 docs/CURRENT-STATE.md                |  4 ++++
 src/layers/perimeters/cards.js       |  5 ++++-
 src/layers/perimeters/cards.test.mjs | 31 ++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index f1244947d..e954ae082 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -4239,6 +4239,10 @@ by `scripts/qa-emergency-squawk.mjs`. Both accept `--timeout-ms` for slow boot.
 
 Fire Perimeters uses capped, timed server reads with stale-on-error caching and a per-client limit. A stale snapshot is served for at most 24 hours; the layer row then reads STALE, dated by that snapshot's fetch, and `get_fire_perimeters` returns `stale` and `retrieved_at` with "(data may be stale)" in its summary. Unchanged snapshots retain geometry; link checks cancel on disable or selection change, and the row legend shows reported containment.
 
+The incident card rounds the WFIGS size to whole acres, except under one acre,
+where it keeps the reported hundredths: a 0.25-acre fire reads `0.25 ac`, not
+`0 ac`.
+
 Prohibited & Restricted Airspace is off by default (share-link token `8`) and sits in
 Infrastructure. The proxy pages `TYPE_CODE IN ('P','R')` from the FAA SUA
 FeatureServer, caps the body, and reuses a one-hour snapshot, serving the last
diff --git a/src/layers/perimeters/cards.js b/src/layers/perimeters/cards.js
index aef5913ce..a6cb3ac4d 100644
--- a/src/layers/perimeters/cards.js
+++ b/src/layers/perimeters/cards.js
@@ -159,7 +159,10 @@ export function buildIncidentCard(row, nowMs, { link = null } = {}) {
   // the known cause, behavior and complexity values and the wording around them.
   const facts = [];
   if (Number.isFinite(row.acres)) {
-    const acres = Math.round(row.acres);
+    // WFIGS reports sizes to the hundredth of an acre; a fire under one acre
+    // keeps them rather than reading "0 ac".
+    const acres =
+      row.acres < 1 ? Math.round(row.acres * 100) / 100 : Math.round(row.acres);
     facts.push(
       tn(acres, '{acres} ac', '{acres} ac', { acres: formatNumber(acres) }),
     );
diff --git a/src/layers/perimeters/cards.test.mjs b/src/layers/perimeters/cards.test.mjs
index 0e064bff0..fe4aac06b 100644
--- a/src/layers/perimeters/cards.test.mjs
+++ b/src/layers/perimeters/cards.test.mjs
@@ -302,3 +302,34 @@ test('partial incident details render only the facts that exist', () => {
     'Catron County · $85K to date',
   ]);
 });
+
+test('a fire under one acre keeps its WFIGS size instead of reading 0 ac', () => {
+  const row = {
+    stableId: 'x',
+    name: 'Grey',
+    acres: 0.25,
+    containedPct: null,
+    state: 'US-WA',
+    category: 'WF',
+    discoveredTime: null,
+    updatedTime: null,
+    cause: null,
+    behavior: null,
+    personnel: null,
+    county: null,
+    costToDate: null,
+    complexity: null,
+  };
+  assert.equal(
+    buildIncidentCard(row, 1758000000000).details[0],
+    '0.25 ac · containment unknown · US-WA',
+  );
+  assert.equal(
+    buildIncidentCard({ ...row, acres: 0.01 }, 1758000000000).details[0],
+    '0.01 ac · containment unknown · US-WA',
+  );
+  assert.equal(
+    buildIncidentCard({ ...row, acres: 1.4 }, 1758000000000).details[0],
+    '1 ac · containment unknown · US-WA',
+  );
+});