diff --git a/atlas/modeles/entities/vmObservations.py b/atlas/modeles/entities/vmObservations.py
index 141fd751..319f3aa5 100644
--- a/atlas/modeles/entities/vmObservations.py
+++ b/atlas/modeles/entities/vmObservations.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 from geoalchemy2.types import Geometry
-from sqlalchemy import Column, Date, Integer, MetaData, String, Table, Text
+from sqlalchemy import Column, Date, Integer, MetaData, String, Table, Text, ARRAY
 from sqlalchemy.ext.declarative import declarative_base
 
 from atlas.env import db
@@ -40,6 +40,7 @@ class VmObservationsMailles(Base):
         Column("annee", String(1000), primary_key=True, index=True),
         Column("id_maille", Integer, primary_key=True, index=True),
         Column("nbr", Integer),
+        Column("id_observations", ARRAY(Integer)),
         schema="atlas",
         autoload=True,
         autoload_with=db.engine,
diff --git a/atlas/modeles/repositories/vmObservationsMaillesRepository.py b/atlas/modeles/repositories/vmObservationsMaillesRepository.py
index f6edb9ba..c6385515 100644
--- a/atlas/modeles/repositories/vmObservationsMaillesRepository.py
+++ b/atlas/modeles/repositories/vmObservationsMaillesRepository.py
@@ -58,11 +58,13 @@ def lastObservationsMailles(connection, mylimit, idPhoto):
     sql = """
         SELECT obs.*,
         tax.lb_nom, tax.nom_vern, tax.group2_inpn,
-        o.dateobs, o.altitude_retenue,
-        medias.url, medias.chemin, medias.id_media
+        o.dateobs, o.altitude_retenue, o.id_observation,
+        medias.url, medias.chemin, medias.id_media,
+        m.geojson_maille
         FROM atlas.vm_observations_mailles obs
         JOIN atlas.vm_taxons tax ON tax.cd_ref = obs.cd_ref
-        JOIN atlas.vm_observations o ON o.id_observation=obs.id_observation
+        JOIN atlas.vm_observations o ON o.id_observation=ANY(obs.id_observations)
+        JOIN atlas.t_mailles_territoire m ON m.id_maille=obs.id_maille
         LEFT JOIN atlas.vm_medias medias
             ON medias.cd_ref = obs.cd_ref AND medias.id_type = :thisID
         WHERE  o.dateobs >= (CURRENT_TIMESTAMP - INTERVAL :thislimit)
diff --git a/atlas/static/mapGenerator.js b/atlas/static/mapGenerator.js
index 0628d170..54cc3086 100644
--- a/atlas/static/mapGenerator.js
+++ b/atlas/static/mapGenerator.js
@@ -334,7 +334,7 @@ function generateGeojsonGridArea(observations) {
 }
 
 function displayGridLayerArea(observations) {
-  myGeoJson = generateGeojsonGridArea(observations);
+    myGeoJson = generateGeojsonGridArea(observations);
   currentLayer = L.geoJson(myGeoJson, {
     onEachFeature: onEachFeatureMaille,
     style: styleMaille,
@@ -585,6 +585,7 @@ function generateGeoJsonMailleLastObs(observations) {
         geometry: obs.geojson_maille,
         properties: {
           meshId: obs.id_maille,
+          list_id_observation: [obs.id_observation],
           taxons: [
             {
               cdRef: obs.cd_ref,
diff --git a/data/atlas/13.atlas.vm_observations_mailles.sql b/data/atlas/13.atlas.vm_observations_mailles.sql
index 557bfa75..757c69dd 100644
--- a/data/atlas/13.atlas.vm_observations_mailles.sql
+++ b/data/atlas/13.atlas.vm_observations_mailles.sql
@@ -1,21 +1,25 @@
-CREATE MATERIALIZED VIEW atlas.vm_observations_mailles AS
-    SELECT
-        o.cd_ref,
-        date_part('year', o.dateobs) AS annee,
-        m.id_maille,
-        COUNT(o.id_observation) AS nbr
-    FROM atlas.vm_observations AS o
-        JOIN atlas.t_mailles_territoire AS m
-            ON (o.the_geom_point && m.the_geom)
-    GROUP BY o.cd_ref, date_part('year', o.dateobs), m.id_maille
-    ORDER BY o.cd_ref, annee
-WITH DATA;
+    CREATE MATERIALIZED VIEW atlas.vm_observations_mailles AS
+        SELECT
+            o.cd_ref,
+            date_part('year', o.dateobs) AS annee,
+            m.id_maille,
+            COUNT(o.id_observation) AS nbr,
+            ARRAY_AGG(o.id_observation) AS id_observations
+        FROM atlas.vm_observations AS o
+            JOIN atlas.t_mailles_territoire AS m
+                ON (o.the_geom_point && m.the_geom)
+        GROUP BY o.cd_ref, date_part('year', o.dateobs), m.id_maille
+        ORDER BY o.cd_ref, annee
+    WITH DATA;
 
-CREATE UNIQUE INDEX ON atlas.vm_observations_mailles
-    USING btree (cd_ref, annee, id_maille);
+    CREATE UNIQUE INDEX ON atlas.vm_observations_mailles
+        USING btree (cd_ref, annee, id_maille);
 
-CREATE INDEX ON atlas.vm_observations_mailles
-    USING btree (annee);
+    CREATE INDEX ON atlas.vm_observations_mailles
+        USING btree (annee);
 
-CREATE INDEX ON atlas.vm_observations_mailles
-    USING btree (id_maille, cd_ref);
+    CREATE INDEX ON atlas.vm_observations_mailles
+        USING gin (id_observations);
+
+    CREATE INDEX ON atlas.vm_observations_mailles
+        USING btree (id_maille, cd_ref);