Creating a Bathymetric Database & Datum Conversion · 2013. 12. 3. · CIRP 1st CMS Webinar,...

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Creating a Bathymetric Database & Datum Conversion

Mitchell Brown Civil Engineering Technician [email protected] June 11, 2012

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1. REPORT DATE 11 JUN 2012 2. REPORT TYPE

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4. TITLE AND SUBTITLE Creating a Bathymetric Database & Datum Conversion

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13. SUPPLEMENTARY NOTES 1st CMS Webinar, Coastal Inlets Research Program, June 11-15, 2012.

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1st CMS Webinar, Coastal Inlets Research Program, June 11-15, 2012 2

Introduction to Bathymetric Databases in SMS

Introduction to working with bathymetric datasets ► Importing Datasets (xyz, points, shapefiles, other ascii)

Datum Conversion ► SMS conversion (Corpscon; Global Mapper)

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1st CMS Webinar, Coastal Inlets Research Program, June 11-15, 2012

Multiple Bathymetric Datasets

Limited bay bathymetry NOAA – Offshore datasets LIDAR – Shoreline and

nearshore (important for structure resolution)

Channel ► NJ State maintains north

channel and north bay channel ► Federally maintained entrance

and south channel (15 years)

NAN-supported field data collection ► Included bathymetry of the backbay (Spring High Tide)

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1st CMS Webinar, Coastal Inlets Research Program, June 11-15, 2012 4 4

Common Spatial Reference Datum & Vertical Datum

Horizontal Projection & Datum: Pick a system in metric units that is planar (UTM; State Plane)

Vertical Projection & Datum: Must be in metric as well; Datum is not necessary (Local)

…Need to convert all bathymetric data

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Tides and Currents (NOAA)

http://tidesandcurrents.noaa.gov/station_retrieve.shtml?type=Datums

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Vertical Datum Conversions

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NAVD 88

MSL

MLW

NGVD 29

MLLW

2.25 ft (0.686 m)

NOAA (Long Branch) COE NAN Benchmark

1.1 ft (0.335 m)

1.59 ft (0.485 m)

0.18 ft (0.055 m)

0.24 ft (0.073 m)

1.9 ft (0.579 m)

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Prep for the Coastal Modeling System

Based off of a Cartesian grid Planar coordinate system Model computation is in metric and depths are positive from zero

(elevations are flipped) Grid is generated based off of a single bathymetry file stored in SMS

scatterset file format Vertical datum is not specified and is assumed local

The boundary condition forcing (tidal) must be in the same datum as the bathymetry

Typically modeling grids are brought to a mean datum such as mean sea level (msl) or mean tide level (mtl)

This requires that all datasets are brought in to unified projection, datum, and units Shark River Inlet bathymetry will be converted to State Plane horizontal

coordinates in meters with the vertical datum set to MSL in meters

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Reprojecting Coordinates and Changing Datums

Object Projection tells SMS the present projection. Checking “Specify” Project Projection is used to change the projection. It will physically change the coordinates of everything loaded in SMS. The projection settings are saved in the SMS project file (*.sms).

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Converting Elevations to Depths (CMS Requirement)

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CMS uses Depths (positive values are at the water surface and down deeper into the water column) instead of Elevations (positive values are at the water surface and above) • Data Transform Can adjust scatterset data by scaling, translating (adding/subtracting), or rotating horizontal or vertical. • Select Depths Elevations Flips negative elevations to positive depths. Necessary for CMS model calculation.

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NAN Channel Surveys

Date Survey Type Date Survey Type

1-Jan-1995 Condition 28-Mar-2007 Condition 6-Jan-1998 Condition 30-Aug-2007 Before Dredge 6-May-1999 Condition 4-Jan-2008 After Dredge

11-Apr-2000 Condition 25-Mar-2008 Condition 16-Apr-2002 Condition 9-Jun-2008 After Dredge 6-Dec-2002 Before Dredge 31-Oct-2008 After Dredge

18-Jan-2003 After Dredge 8-Dec-2008 Before Dredge 7-Jul-2003 Condition 6-Jan-2009 After Dredge

7-Aug-2003 After Dredge 15-Apr-2009 Before Dredge 28-Apr-2004 Condition 1-May-2009 After Dredge 10-Jun-2005 Condition 20-Aug-2009 Before Dredge 23-Dec-2005 After Dredge 10-Dec-2009 After Dredge 23-May-2006 Condition 6-Jan-2010 After Dredge 27-Nov-2006 Condition

15 Year Record of Bathymetry

Horizontal Datum: State Plane NAD27 New Jersey 2900 (ft) Vertical Datum: MLW (ft) – COE Datum (not local NOAA benchmark)

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Conversions

NAVD 88

MSL

MLW

NGVD 29

MLLW

2.25 ft (0.686 m)

NOAA (Long Branch) COE NAN Benchmark

1.1 ft (0.335 m)

1.59 ft (0.485 m)

0.18 ft (0.055 m)

0.24 ft (0.073 m)

1.9 ft (0.579 m)

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NAN Surveys MLW MSL

1.9ft + 1.12ft – (0.24ft) = 2.76 ft (.841m)

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NAN Channel Surveys Extended in to Bay

Horizontal Datum: State Plane NAD27 New Jersey 2900 (ft) Vertical Datum: MLW (ft) – COE Datum (not local NOAA benchmark)

Full Channel Survey

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NAN Surveys MLW MSL

1.9ft + 1.12ft – (0.24ft) = 2.76 ft (.841m)

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Dataset Calculator

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Dataset Toolbox

Tools--------------,

l;l · Math

! !····Compare data sets

! L.i•MiiD $)·· Spatial

!···· Smooth data sets

i !····Geometry

! L. .. Grid Spacing

1$1· Temporal

L. .. Sample time steps

1$1· Conversion i '····Scalar to Vector

EJ· Coastal

'-···Wave Length and Celerity

i '····Gravity Waves

13· Modification

i···· Map activity

'-··Filter

Update Available Tools

Help ...

Data Calculator

Data Sets

EJ··Ej 3364_0409_ft_MLW (act ive)

! tmJ a. Z

i· .. ·tml b. x locat ion

! ···tml c. y location

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Add to Expression I Data Set Info .. .

Output data set name : lm msli

Time Steps

-I

ri Use all time steps

Calculator

I d+ 0.841

J I ( I ) I min I * I In I x"y I max I - I log I sqrt I ave I

I + I 1/x I abs I trunc I II I Compute A

Done

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NJ DEP Channel Surveys

Provided conversion from local datum to NAVD88: MLW NAVD88 + 2.41 ft (0.735 m) MLW MSL + 2.17 ft (0.661 m)

June 2009 Survey

XYZ pulled out of drawing and changed to ascii format

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Field Data Collection – Multibeam Bay Bathymetry (August 2009)

Horizontal Datum: State Plane

NAD83 New Jersey 2900 (m)

Vertical Datum: NAVD88 (m)

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LIDAR

Files are emailed in separate sections from the NOAA CSC Archive Typically several to 10s of files that

are 5 - 100 mb in size Compiling takes time Points have been sampled/filtered

and cropped to area of interest Horizontal Datum: State Plane NAD83 New Jersey 2900 (ft) Vertical Datum: NAVD88 (ft)

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Coastal Relief Model (DTM/DEM)

Generate a 3 sec (pt/3rd second) grid

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Coastal Relief Model

Horizontal Datum: Geographic NAD83 Vertical Datum: MSL (m) – Not accurate for shallow bathymetry (used for offshore)

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Extra Bathymetry

Convert shoreline shapefile in SMS

Horizontal Datum: State Plane NAD83

New Jersey 2900 (ft)

Added extra bay contour (set to -0.75 m)

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Create a Contour Polyline in the Map Module

Select Default Coverage under Map Data Type Generic Mapping/Observation/Shoals

Draw arcs (polylines) feature with tool

Select arcs and convert the z elevation to the desired contour elevation

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Create Scatterset Points from Map Data

Select arcs to redistribute the spacing of vertices Feature Objects Redistribute Vertices Specify Spacing based on horizontal coordinate system units (metric in this case)

Feature Objects Map>Scatter Include Feature Pts and vertices and the Arc Elevations

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All Files Referenced to Same Horizontal and Vertical Datum

Delete unnecessary data points (check alignment and elevations in overlapping datasets)

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Merging Scattersets Merging all scattersets will integrate all points. Overlapping areas of scattersets should either be deleted, or use a separate method of merging (by prioritizing using triangles).

Select the dataset

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1st CMS Webinar, Coastal Inlets Research Program, June 11-15, 2012 24 24

Surface-water Modeling System (SMS)

Questions?

Mitch Brown [email protected]

601-634-4036

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Creating a Bathymetric Database & Datum Conversion · 2013. 12. 3. · CIRP 1st CMS Webinar,...

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