{"id":9958,"date":"2026-05-06T18:25:52","date_gmt":"2026-05-06T16:25:52","guid":{"rendered":"https:\/\/www.lidar-bathymetrique.fr\/?page_id=9958"},"modified":"2026-05-06T18:31:42","modified_gmt":"2026-05-06T16:31:42","slug":"bathymetrie-cotiere","status":"publish","type":"page","link":"https:\/\/www.lidar-bathymetrique.fr\/en\/services\/bathymetrie-cotiere\/","title":{"rendered":"Bathym\u00e9trie c\u00f4ti\u00e8re"},"content":{"rendered":"
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Verticale m\u00e9tier<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Bathym\u00e9trie c\u00f4ti\u00e8re<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Trait de c\u00f4te, plages, baies, embouchures et deltas. La bathym\u00e9trie LiDAR a\u00e9roport\u00e9e restitue la continuit\u00e9 topo-bathym\u00e9trique sur l’estran, sans rupture entre l’\u00e9merg\u00e9 et l’immerg\u00e9, \u00e0 une r\u00e9solution adapt\u00e9e aux \u00e9tudes de recul du trait de c\u00f4te, bilans s\u00e9dimentaires, suivi des ouvrages de protection …\u00a0<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Le principe<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Mesurer le littoral en continuit\u00e9, sans mise \u00e0 l'eau.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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L\u00e0 o\u00f9 une cha\u00eene SONAR doit s’arr\u00eater et passer le relais \u00e0 des relev\u00e9s terrestres classiques, le LiDAR vert capte toute la donn\u00e9e en un seul vol : dunes, plage, estran, petits fonds.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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En M\u00e9diterran\u00e9e, la port\u00e9e du signal atteint typiquement 8 \u00e0 10 m en eaux claires, avec une pr\u00e9cision centim\u00e9trique.<\/p>

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Le dataset livr\u00e9 est exploitable sans recalage par les mod\u00e9lisateurs hydrauliques et les services littoraux qui m\u00e8nent les \u00e9tudes de bilan s\u00e9dimentaire ou de recul du trait de c\u00f4te.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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< 8 cm<\/div>
Pr\u00e9cision Z
contr\u00f4l\u00e9e par GNSS<\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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> 8 \u00e0 10 m<\/div>
Profondeur typique
en eaux claires<\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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50 pts\/m\u00b2<\/div>
Densit\u00e9 moyenne
topo + bathy<\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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1 jour<\/div>
Couverture de 2 \u00e0 4 km
de trait de c\u00f4te<\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Six contextes o\u00f9 la bathym\u00e9trie c\u00f4ti\u00e8re fait la diff\u00e9rence<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Du suivi du recul du trait de c\u00f4te aux \u00e9tudes d’impact en zone prot\u00e9g\u00e9e, la donn\u00e9e topo-bathym\u00e9trique a\u00e9roport\u00e9e est le socle m\u00e9trique d’une grande vari\u00e9t\u00e9 d’\u00e9tudes.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Suivi du trait de c\u00f4te<\/h3>

Monitoring du recul, comparaisons multi-temporelles, dossiers loi Climat & R\u00e9silience. Capacit\u00e9 de r\u00e9p\u00e9tition annuelle \u00e0 co\u00fbt ma\u00eetris\u00e9.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Bilan s\u00e9dimentaire littoral<\/h3>

Quantification des transferts, identification des zones d'\u00e9rosion et d'accumulation, alimentation de mod\u00e8les c\u00f4tiers.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\u00c9tudes d'impact et SCoT<\/h3>

Donn\u00e9es pour \u00e9tudes d'impact environnemental, sch\u00e9mas de coh\u00e9rence territoriale, PPRL, dossiers ICPE en zone littorale.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Am\u00e9nagements c\u00f4tiers<\/h3>

Lev\u00e9 de r\u00e9f\u00e9rence pour ouvrages de protection (\u00e9pis, brise-lames), rechargements de plages, op\u00e9rations de d\u00e9fense contre la mer.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Habitats et zones prot\u00e9g\u00e9es<\/h3>

Cartographie de fonds en zone Natura 2000, parcs marins, aires marines prot\u00e9g\u00e9es. Approche sans contact, sans perturbation du milieu.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Embouchures et deltas<\/h3>

Zones complexes o\u00f9 l'interface fluvio-marine est mal restitu\u00e9e par les autres techniques. Le LiDAR op\u00e8re en continuit\u00e9 parfaite.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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BRGM \u00b7 2025<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Suivi s\u00e9dimentaire dans la baie de Calvi<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Campagne pluriannuelle de suivi s\u00e9dimentaire pour le Bureau de Recherches G\u00e9ologiques et Mini\u00e8res ( BRGM ) de Corse sur le secteur de Calvi. Acquisition LiDAR bathym\u00e9trique pour caract\u00e9riser l’\u00e9volution des stocks s\u00e9dimentaires et alimenter les bilans de transit littoral. Protocole reproductible, permettant la comparaison annuelle des datasets.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Multi-sites<\/div>
Calvi, Tenutalla, Ostriconi ...<\/div><\/div>
Drone<\/div>
DJI M400 + Navigator<\/div><\/div>
Annuel<\/div>
Suivi reproductible<\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Le d\u00e9roul\u00e9 d'une mission<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Chaque \u00e9tape est trac\u00e9e et document\u00e9e. La m\u00eame rigueur, du cadrage au livrable.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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01<\/span>Sous 48 h<\/span><\/div>

Cadrage et chiffrage<\/h3>

Examen du lin\u00e9aire c\u00f4tier, des contraintes maritimes et environnementales (Natura 2000, parcs marins). Proposition technique et financi\u00e8re d\u00e9taill\u00e9e.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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02<\/span>1 \u00e0 2 semaines<\/span><\/div>

Pr\u00e9paration et autorisations<\/h3>

D\u00e9marches DGAC, autorisations en zone prot\u00e9g\u00e9e, coordination avec les gestionnaires littoraux. Surveillance continue de la fen\u00eatre m\u00e9t\u00e9o et de l'\u00e9tat de la mer.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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03<\/span>1 \u00e0 4 jours<\/span><\/div>

Acquisition a\u00e9roport\u00e9e<\/h3>

Vol drone ou h\u00e9licopt\u00e8re selon le lin\u00e9aire. Conditions optimales : mer calme (creux < 1 m), absence d'inversion thermique. Calage par base GNSS au sol.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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04<\/span>2 \u00e0 4 semaines<\/span><\/div>

Traitement et livrables<\/h3>

Post-traitement PPK avec correction de r\u00e9fraction sous-marine, classification du nuage, g\u00e9n\u00e9ration du MNT topo-bathym\u00e9trique, rapport m\u00e9thodologique.<\/p><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Ce que vous recevez<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Tous les livrables sont g\u00e9or\u00e9f\u00e9renc\u00e9s en syst\u00e8me l\u00e9gal de votre territoire et accompagn\u00e9s d’une note m\u00e9thodologique d\u00e9taillant les param\u00e8tres d’acquisition et le bilan de pr\u00e9cision.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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01<\/div>
Nuage de points classifi\u00e9<\/div>
LAS \u00b7 LAZ<\/div><\/div>
Sol, v\u00e9g\u00e9tation dunaire, surface d'eau, fond marin class\u00e9s selon ASPRS \u00e9tendue. Densit\u00e9 50 pts\/m\u00b2.<\/div><\/div><\/div>
02<\/div>
MNT topo-bathym\u00e9trique<\/div>
GeoTIFF \u00b7 ASC \u00b7 XYZ<\/div><\/div>
Continu de la dune au petit fond, sans rupture. R\u00e9solution 15 cm\/pixel adaptable selon l'usage.<\/div><\/div><\/div>
03<\/div>
Trait de c\u00f4te de r\u00e9f\u00e9rence<\/div>
SHP \u00b7 DWG<\/div><\/div>
Trait de c\u00f4te vectoris\u00e9 selon r\u00e9f\u00e9rentiel IGN ou local (laisse de haute mer, pied de dune, etc.).<\/div><\/div><\/div>
04<\/div>
Profils de plage<\/div>
DWG \u00b7 DXF \u00b7 CSV<\/div><\/div>
Profils en travers extraits selon les conventions DREAL ou les protocoles du R\u00e9seau d'Observation du Littoral.<\/div><\/div><\/div>
05<\/div>
Comparaison multi-temporelle<\/div>
GeoTIFF \u00b7 PDF<\/div><\/div>
Carte des diff\u00e9rences altim\u00e9triques entre deux campagnes. Quantification volum\u00e9trique des \u00e9volutions.<\/div><\/div><\/div>
06<\/div>
Note m\u00e9thodologique<\/div>
PDF<\/div><\/div>
Conditions d'acquisition, \u00e9tat de la mer, param\u00e8tres du capteur, bilan de pr\u00e9cision, zones d'incertitude.<\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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D\u00e9marrer un projet<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Un trait de c\u00f4te \u00e0 suivre ?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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D\u00e9crivez-nous le lin\u00e9aire et les enjeux. Nous revenons sous 48 h avec une proposition technique adapt\u00e9e.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tDemander un devis<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Adresse<\/div>
26 cours Grandval
20000 Ajaccio<\/div><\/div>
T\u00e9l\u00e9phone<\/div>
+33 7 89 02 85 71<\/a><\/div><\/div>
Courriel<\/div>
info@helix.corsica<\/a><\/div><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Verticale m\u00e9tier Bathym\u00e9trie c\u00f4ti\u00e8re Trait de c\u00f4te, plages, baies, embouchures et deltas. La bathym\u00e9trie LiDAR a\u00e9roport\u00e9e restitue la continuit\u00e9 topo-bathym\u00e9trique sur l’estran, […]<\/p>","protected":false},"author":1,"featured_media":0,"parent":9809,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/page_front-page.php","meta":{"footnotes":""},"class_list":["post-9958","page","type-page","status-publish","hentry"],"yoast_head":"\nBathym\u00e9trie c\u00f4ti\u00e8re par LiDAR a\u00e9roport\u00e9 \u2014 Trait de c\u00f4te, \u00e9rosion, ouvrages | HELIX<\/title>\n<meta name=\"description\" content=\"Bathym\u00e9trie c\u00f4ti\u00e8re par LiDAR a\u00e9roport\u00e9 drone et h\u00e9licopt\u00e8re. Continuit\u00e9 topo-bathy sur l'estran, suivi du trait de c\u00f4te, \u00e9rosion littorale. 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