Water Depth Mapping Resource

This forum is provided for the further edification of our club members seeking to improve their knowledge and diving skills. (recreational diving only)
Post Reply
Zwickm
Hi, I'm New To NWDC!
Posts: 2
Joined: Thu Jan 23, 2020 3:24 pm

Water Depth Mapping Resource

Post by Zwickm » Wed Jan 29, 2020 4:36 pm

Hi All,
Sharing this site i use to look at depths and underwater terrain before diving. It has very detailed information local and across the world. Great to reference when looking at new sites! Link below.

http://fishing-app.gpsnauticalcharts.co ... 1/-124.074

User avatar
carlk3
Aquaphile
Posts: 133
Joined: Wed Apr 09, 2014 8:59 am

Re: Water Depth Mapping Resource

Post by carlk3 » Fri Jan 31, 2020 6:11 pm

Nice. It seems like the depths are from mean low tide (e.g. it shows Edmonds UW park as a max of 30 ft), but you can set an option to add an offset (+10 so 40ft)

User avatar
YellowEye
I've Got Gills
Posts: 2686
Joined: Sun Oct 29, 2006 8:08 am

Re: Water Depth Mapping Resource

Post by YellowEye » Sun Feb 02, 2020 5:02 pm

Very interesting! I enjoyed looking at this!
Kind request: Always keep your reg in your mouth when entering/leaving the water! There's always a chance of a slip or a rogue wave, and several locals have perished from not having their regs at the ready over the years.

User avatar
Jonny Quest
Hi, I'm New To NWDC!
Posts: 2
Joined: Fri Oct 04, 2019 10:54 am

Re: Water Depth Mapping Resource

Post by Jonny Quest » Wed Feb 19, 2020 12:30 pm

If you havent already- I'd check out the mobile Navionics Boating app.

User avatar
Cmjstealth
Avid Diver
Posts: 76
Joined: Sat Jan 29, 2011 11:02 pm

Re: Water Depth Mapping Resource

Post by Cmjstealth » Wed Sep 23, 2020 4:09 pm

Although there isn't full coverage across all the Puget Sound there is super high resolution bathymetry available thanks to the NOAA Hydrographic Survey: https://maps.ngdc.noaa.gov/viewers/bathymetry/

Selecting "BAG Color Shaded Relief" will show you the high resolution NOAA Hydrographic Survey stuff. Attached is an example near long island. "DEM Color Shaded Relief" will show data with much wider coverage but it unfortunately is much lower resolution. The color legends are viewable when you hover over the question mark icons. Unfortunately the scales are logarithmic but if you need a more specific depth estimate I've had success using a color picker tool in a graphics editors to measure the hue at a specific point and by comparing to a hue based color legend I made in excel. If others have an easier way I'd love to hear how you go about it.

Also... for fun turn off the DEM stuff and instead select "Multibeam Bathymetry Mosaic" which has data collected from various research vessels worldwide and zoom out to see just how little of the world's oceans have been explored. https://maps.ngdc.noaa.gov/viewers/iho_dcdb/ also has similar (or the same?) data available.
Bathymetry.png

User avatar
eh.haole
Avid Diver
Posts: 70
Joined: Mon Jul 02, 2018 11:18 pm

Re: Water Depth Mapping Resource

Post by eh.haole » Fri Sep 25, 2020 3:00 pm

Cmjstealth wrote:
Wed Sep 23, 2020 4:09 pm
super high resolution bathymetry available thanks to the NOAA Hydrographic Survey: https://maps.ngdc.noaa.gov/viewers/bathymetry/
Cool, now I can guesstimate where it was that I clung to a rock/ramp for ten minutes, about 30 minutes into a "late slack" (aka too early start) :crabmode:
Screen Shot 2020-09-25 at 2.54.44 PM.png

Post Reply