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TOPIC: Using Reefmaster for mapping of large seabed areas

Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10913

  • Team Krokodille
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Hi everyone,

Just wantet to share a project I'm working on. Im currently in the process of making my own nautical maps over the Oslofjord and the Norwegian zone of Skagerrak. The sonardata are based on publically avalable data that I have processed through a software called FME before triangulation in Reefmaster. Screenshots of depth maps are taken after export to Google Earth.

Picture 1

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Also, I'm using Reefmaster to create map layers of bottom composition, fishery areas, spawning grounds, etc. I'm modifiyng these before combining all the layers in Insight Map Creator so tha each layer can be turned on and off on my Simrad unit. The screenshots of the differende bottom compositions are taken from Reefmaster, one displaying data shown as areas, and another showing the exact probing points with a buffer around the. The small red triangles are coordinates for undersea reefs that I also have downloaded from publically available data.

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The area for my Skagerak map are about 10.000 square kilometers, I was able to do this by dividing the area up in several smaller areas and combining them in Insight Map Creater after exporting all the different projects to shape from Reefmaster.
Last Edit: 9 months 4 weeks ago by Matt.
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10914

  • fjordfisher
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Cool, but why you don't use the ready interpolated datas from the Norwegian government (free downloadable shape files)?
You can directly load this shapefiles into RM, mostly possible in a size of a complete norwegian county (eg Hordaland).

With help of RM i could create a complete norwegian sea chart.
If you also use topo elements, you can beautify your chart.
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10915

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Well fjordfisher, this is exactly what I've done. But the ready interpolated models comes in a 50m grid and these models are not very accurate along the coastlines. So I have combined these models with the datasets containing raw "ungraded" data that also contains other information such as underground shallow areas, reefs, boat ramps, shorelines/land areaas etc. I have combined data from several different sources so that I get the best possible results based on freely available data. All data have been processed in Reefmaster, but I have used FME, AutoCAD and ArcGIS for preparation, clipping and supplementing the data when needed.

Yes, I have the data for the entire Norwegian coast and can continue building my maps based on that if I want to. The reason for dividing into smaller areas is because using the data without clipping it would cause Reefmaster to not being able to triangulate these large areas, I have tried. :)
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10916

  • fjordfisher
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I believe, that you missunderstand me. The datas you mean are the 50 m grid datas. With 50 m distanz between data points you can't get correct results in norwegian waters, in the much flatter baltic sea is this also only limitid possible.

But i mean the ready shape files (with 5m, 10m, 20m, 30m, 40m, 50m, 100m, 150m ... lines/areas/deep points, flood aeras etc.). This is about the same material, as for the Navionics/Garmin... charts und i believe, this is good material for an overview/fishing spots. The job for me is create new overlay maps with my own datas, but as background i only use the official datas.
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10917

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Yes, these are the data that I have used. But in most areas on the east and southern coast of Norway the distance between points are often more than 50m. apart and cover mostly the near coast areas. Thats why I use the 50m grid data as supplement to my other data. I do not agree that 50 grid is to coarse to be able to represent the sea bottom in Norway, at least not for my use witch is to reveal areas with high slope for fisfhing. If you are referring to the ready shapefiles with contur lines, these are based on old data from 2011 with 300, 600 and 1000m grid so these are completely useless. :)
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10918

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This is my data source:

kartkatalog.geonorge.no/metadata/uuid/27...50-a208-3532a51c529a

If you have a source for better free downloadable datas, please tell it. Thanks! It's a bit hard to understand norwegean texts and find the right.
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Using Reefmaster for mapping of large seabed areas 9 months 4 weeks ago #10919

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No sir, you are using the correct data, same as I. But you germans tend to fish on the west and northwestern coast of Norway, and the mapping of the seabed is much better there than on the east and southern coast. If you go some NM from the coast you even have access to the 10m grid dtm models that are done (i guess because of the oildrilling in the North Sea) and also the data from the Mareano project. Unfortunately I only fish in the Oslofjord and Skagerrak. :)
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Using Reefmaster for mapping of large seabed areas 9 months 3 weeks ago #10935

  • Team Colibri
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Good to see you made it to the RM-forum Atle. :)
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Using Reefmaster for mapping of large seabed areas 9 months 3 weeks ago #10937

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Thanks! :)
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Using Reefmaster for mapping of large seabed areas 9 months 3 weeks ago #10938

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I've made a small video showcasing the project:

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Using Reefmaster for mapping of large seabed areas 9 months 2 weeks ago #10954

  • Meggs1
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Impressive...
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