Seamarks/INT-1 Section J
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Seamark tagging
Section J - Nature of the Seabed
Rendering of chart symbols and letters indicating the nature of the seabed surface are intended to show starting at zoom level 14 and higher (like for rocks) and at the point or center of an area/polygon (like for anchorages). The boundary of an seabead_area without danger to shipping at the surface (i.e. no obstruction, distinct from K1) shall be indicated with a thin and short dashed black line like indicated in INT-1 J20 (alternatively similar to K31 or I20).
Additional references for particle size classification are provided in the international standard ISO 14688-1 and are described for seabeds in a publication on Substrate Data for European Maritime Areas.
Types of Seabed
| INT-1 Ref | Seamark Rendering | Seamark Tagging | Notes | Wiki Page |
|---|---|---|---|---|
| J1 | S | seamark:type=seabed_area   seamark:seabed_area:surface=sand |
Sand: Tiny grains of crushed or worn rock (particles of 0.0625-2.0mm). | Nature of surface (NATSUR)(en) |
| J2 | M | seamark:type=seabed_area seamark:seabed_area:surface=mud |
Mud: Soft, wet earth. | Nature of surface (NATSUR)(en) |
| J3 | Cy | seamark:type=seabed_area seamark:seabed_area:surface=clay |
Clay: Stiff, sticky earth that becomes hard when baked (particles of less than 0.002mm). | Nature of surface (NATSUR)(en) |
| J4 | Si | seamark:type=seabed_area seamark:seabed_area:surface=silt |
Silt: When dried on hand will rub off easily (particles of 0.002-0.0625mm). | Nature of surface (NATSUR)(en) |
| J5 | St | seamark:type=seabed_area seamark:seabed_area:surface=stones |
Stones: Rock fragments ranging in size from pebbles and gravel to boulders or a large rock mass. | Nature of surface (NATSUR)(en) |
| J6 | G | seamark:type=seabed_area seamark:seabed_area:surface=gravel |
Gravel: Small stones with coarse sand (particles of 2.0-4.0mm). | Nature of surface (NATSUR)(en) |
| J7 | P | seamark:type=seabed_area seamark:seabed_area:surface=pebbels |
Pebbles: Small stones made smooth and round by being rolled in water (particles of 4.0-64.0mm). | Nature of surface (NATSUR)(en) |
| J8 | Cb | seamark:type=seabed_area seamark:seabed_area:surface=cobbles |
Cobbles: Stones worn round and smooth by water and used for paving (particles of 64.0-256.0mm). | Nature of surface (NATSUR)(en) |
| J9.1 | R | seamark:type=seabed_area seamark:seabed_area:surface=rocky |
Rock, Rocky: Any formation of natural origin that constitutes an integral part of the lithosphere. The natural occurring material that forms firm, hard, and solid masses. | Nature of surface (NATSUR)(en) |
| J9.2 | Bo | seamark:type=seabed_area seamark:seabed_area:surface=boulders |
Boulder(s): A rounded rock with diameter of 256 mm or larger. | Nature of surface (NATSUR)(en) |
| J10 | Co | seamark:type=seabed_area seamark:seabed_area:surface=coral |
Coral, |
Nature of surface (NATSUR)(en) |
| J11 | Sh | seamark:type=seabed_area seamark:seabed_area:surface=shells |
Shells (skeletal remains): Exoskeletons of various water dwelling animals. | Nature of surface (NATSUR)(en) |
| no equivalent | Lv | seamark:type=seabed_area seamark:seabed_area:surface=lava |
Lava: The fluid or semi-fluid matter flowing from a volcano. The substance that results from the cooling of the molten rock. | Nature of surface (NATSUR)(en) |
| J12.1 | S/M | seamark:type=seabed_area seamark:seabed_area:surface=sand;/;mud |
Two layers, e.g. sand over mud | Nature of surface (NATSUR)(en) |
| J12.2 | fS.M.Sh | seamark:type=seabed_area seamark:seabed_area:surface=sand;mud;shells seamark:seabed_area:surface_qualification=fine;; |
The main constitutent is given first for mixtures, e.g. fine sand with mud and shells
The different tags should be in a ordered, semicolon-separated list. This also applies to the qualifying term tags which should be in the same order. Where a surface type has no qualifying term, use an empty list item. Here e.g. three surface types seperated by semicolon, where the qulifying term is specified only for the first one. |
Nature of surface (NATSUR)(en) |
| J13.1 | Wd | seamark:type=weed seamark:weed:category=sea_weed |
Weed (including Kelp), general description, seaweed as macroalgae | Weed/Kelp (CATWED)(en) |
| J13.2 | 
|
seamark:type=weed seamark:weed:category=sargasso genus=Sargassum taxon=* |
Weed, specific description e.g. category Sargasso, optional addition of genus and taxon for complete specification, Mediterranean sargassum species INT-1 display: PNG:   S-101 Portrayl Catalogue: 
|
Weed/Kelp (CATWED)(en) |
| J13.2 |
|
seamark:type=weed seamark:weed:category=kelp genus=<Laminaria, Saccharina, Macrocystis, etc.> taxon=* |
Kelp, Weed, if possible, add Genus and Taxon for complete description of the specie INT-1 display: PNG: S-101 Portrayl Catalogue:
|
Weed/Kelp (CATWED)(en) |
| J13.3 | Sg | seamark:type=seagrass seamark:seagrass:category=unspecified |
Seagrass, see S-4, change in S-101 update 2021, DCEG Edition 1.0.1, see also difference between seagrass and seeweed | new object Seagrass (SEAGRA)(en) and categories (catseg)(en) (old category Weed/Kelp (CATWED)(en) until 2021-09) |
| J13.4 | 
|
seamark:type=seagrass seamark:seagrass:category=specified genus=<genus within seagrass families Posidoniaceae, Zosteraceae, Hydrocharitaceae, or Cymodoceaceae> taxon=* |
Seagrass, see change and symbol proposed for S-4:
|
new object Seagrass (SEAGRA)(en) and categories (catseg)(en) (old category Weed/Kelp (CATWED)(en) until 2021-09) |
| J13.4 |
|
seamark:type=seagrass seamark:seagrass:category=posidonia genus=Posidonia taxon= Posidonia oceanica (e.g. or other species) |
Posidonia seagrass | new object Seagrass (SEAGRA)(en) and categories (catseg)(en) (old category Weed/Kelp (CATWED)(en) until 2021-09) |
| J14 | 
|
seamark:type=sand_waves
|
Sandwaves, INT-1 display:  PNG:  
|
Sand waves (SNDWAV)(en) |
| J15 | 
|
seamark:type=spring
|
Spring in seabed, INT-1 display:  PNG: S-101 Portrayl Catalogue: 
|
Spring in seabed (SPRING)(en) |
Types of Seabed, Intertidal Areas
| INT-1 Ref | Seamark Rendering | Seamark Tagging | Notes | Wiki Page |
|---|---|---|---|---|
| J20 | St.G  pattern for areas not yet implemented |
seamark:type=seabed_area seamark:seabed_area:surface=stones;gravel |
Areas with stones and gravel, INT-1 display for area with gravel, sand and mud: 
|
Nature of surface (NATSUR)(en) |
| J21 |  and  pattern for areas not yet implemented |
seamark:type=seabed_area  seamark:seabed_area:surface=rocky seamark:seabed_area:water_level=covers |
Rocky area, which covers and uncovers, INT-1 display: 
|
Nature of surface (NATSUR)(en) |
| J22 |  and pattern for areas not yet implemented |
seamark:type=seabed_area seamark:seabed_area:surface=coral seamark:seabed_area:water_level=covers |
Coral reef, which covers and uncovers, INT-1 display: 
|
Nature of surface (NATSUR)(en) |
Qualifying Terms
| INT-1 Ref | Seamark Rendering | Seamark Tagging | Notes | Wiki Page |
|---|---|---|---|---|
| J30 | f | seamark:type=seabed_area seamark:seabed_area:surface=sand seamark:seabed_area:surface_qualification=fine |
Fine, only used in relation to sand: Falls within the smallest size continuum for a particular nature of surface term. | Nature of surface qualifying term (NATQUA)(en) |
| J31 | m | seamark:type=seabed_area seamark:seabed_area:surface=sand seamark:seabed_area:surface_qualification=medium |
Medium, only used in relation to sand: Falls within the moderate size continuum for a particular nature of surface term. | Nature of surface qualifying term (NATQUA)(en) |
| J32 | c | seamark:type=seabed_area seamark:seabed_area:surface=sand seamark:seabed_area:surface_qualification=coarse |
Coarse, only used in relation to sand: Falls within the largest size continuum for a particular nature of surface term. | Nature of surface qualifying term (NATQUA)(en) |
| J33 | bk | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=broken |
Broken: Fractured or in pieces. | Nature of surface qualifying term (NATQUA)(en) |
| J34 | sy | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=sticky |
Sticky: Having an adhesive or glue like property. | Nature of surface qualifying term (NATQUA)(en) |
| J35 | so | seamark:type=seabed_area seamark:seabed_area:surface=surface> seamark:seabed_area:surface_qualification=soft |
Soft: Not hard or firm. | Nature of surface qualifying term (NATQUA)(en) |
| J36 | sf | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=stiff |
Stiff: Not pliant - thick, resistant to flow. | Nature of surface qualifying term (NATQUA)(en) |
| J37 | v | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=volcanic |
Volcanic: Composed of or containing material ejected from a volcano. | Nature of surface qualifying term (NATQUA)(en) |
| J38 | ca | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=calcareous |
Calcareous: Composed of or containing calcium or calcium carbonate. | Nature of surface qualifying term (NATQUA)(en) |
| J39 | h | seamark:type=seabed_area seamark:seabed_area:surface=<surface> seamark:seabed_area:surface_qualification=hard |
Hard: Firm usually refers to an area of the sea floor not covered by unconsolidated sediment. | Nature of surface qualifying term (NATQUA)(en) |