Importing Bathymetric Datasets: Difference between revisions

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'''Multiple Bathymetric Datasets'''
= '''Multiple Bathymetric Datasets''' =


Limited bay bathymetry
Limited bay bathymetry
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'''Common Spatial Reference Datum & Vertical Datum'''
= '''Common Spatial Reference Datum & Vertical Datum''' =


[[Image:NewOrleansDataset 52.png|350px]]
[[Image:NewOrleansDataset 52.png|350px]]
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'''Tides and Currents (NOAA)'''  
= '''Tides and Currents (NOAA)''' =


https://tidesandcurrents.noaa.gov/
https://tidesandcurrents.noaa.gov/
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----
----


'''Vertical Datum Conversions'''  
= '''Vertical Datum Conversions''' =


[[Image:NewOrleansDataset 54.png|400px]]
[[Image:NewOrleansDataset 54.png|400px]]
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----
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'''Prep for the Coastal Modeling System'''
= '''Prep for the Coastal Modeling System''' =
    
    
* Based off of a Cartesian grid
* Based off of a Cartesian grid
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----
----


'''Reprojecting Coordinates and Changing Datums'''  
= '''Reprojecting Coordinates and Changing Datums''' =


[[Image:NewOrleansDataset 9.png|400px]]
[[Image:NewOrleansDataset 9.png|400px]]
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----
----


'''Converting Elevations to Depths (CMS Requirement)'''  
= '''Converting Elevations to Depths (CMS Requirement)''' =


[[Image:NewOrleansDataset 10.png|400px]]
[[Image:NewOrleansDataset 10.png|400px]]
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----
----


'''NAN Channel Surveys'''
= '''NAN Channel Surveys''' =


[[Image:NewOrleansDataset 12.png|400px]]
[[Image:NewOrleansDataset 12.png|400px]]
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----
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'''Conversions'''  
= '''Conversions''' =


[[Image:NewOrleansDataset 8.png|400px]]
[[Image:NewOrleansDataset 8.png|400px]]
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----
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'''NAN Channel Surveys Extended in to Bay'''  
= '''NAN Channel Surveys Extended in to Bay''' =


[[Image:NewOrleansDataset 13.png|400px]]
[[Image:NewOrleansDataset 13.png|400px]]
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----
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'''Dataset Calculator'''  
= '''Dataset Calculator''' =
   
   


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----
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'''NJ DEP Channel Surveys'''  
= '''NJ DEP Channel Surveys''' =
[[Image:NewOrleansDataset 20.png|400px]]
[[Image:NewOrleansDataset 20.png|400px]]


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----
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'''Field Data Collection – Multibeam Bay Bathymetry (August 2009)'''  
= '''Field Data Collection – Multibeam Bay Bathymetry (August 2009)''' =


    
    
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----
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'''LIDAR'''   
= '''LIDAR'''  =
    
    


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----
----
    
    
'''Coastal Relief Model (DTM/DEM)'''  
= '''Coastal Relief Model (DTM/DEM)''' =


[[Image:NewOrleansDataset 24.png|400px]]
[[Image:NewOrleansDataset 24.png|400px]]
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----
----


'''Coastal Relief Model'''  
= '''Coastal Relief Model''' =


[[Image:NewOrleansDataset 28.png|400px]]
[[Image:NewOrleansDataset 28.png|400px]]
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----
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'''Extra Bathymetry'''  
= '''Extra Bathymetry''' =


[[Image:NewOrleansDataset 29.png|400px]]
[[Image:NewOrleansDataset 29.png|400px]]
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'''Convert a Shapefile to Map'''  
= '''Convert a Shapefile to Map''' =


[[Image:NewOrleansDataset 31.png|400px]]
[[Image:NewOrleansDataset 31.png|400px]]
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*Turn off GIS Data Arcs generated where GIS polylines   
*Turn off GIS Data Arcs generated where GIS polylines   
----
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'''Convert a Map to Scatter'''  
= '''Convert a Map to Scatter''' =
[[Image:NewOrleansDataset 34.png|400px]]
[[Image:NewOrleansDataset 34.png|400px]]


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*Modify as necessary (i.e. remove entrance channel shoreline because it is old seawall and jetty configuration – LIDAR used here)
*Modify as necessary (i.e. remove entrance channel shoreline because it is old seawall and jetty configuration – LIDAR used here)
----
----
'''Create a Contour Polyline in the Map Module'''  
= '''Create a Contour Polyline in the Map Module''' =


[[Image:NewOrleansDataset 39.png|400px]]
[[Image:NewOrleansDataset 39.png|400px]]
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----
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'''Create Scatterset Points from Map Data'''  
= '''Create Scatterset Points from Map Data''' =


[[Image:NewOrleansDataset 42.png|400px]]
[[Image:NewOrleansDataset 42.png|400px]]
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'''All Files Referenced to Same Horizontal and Vertical Datum'''
= '''All Files Referenced to Same Horizontal and Vertical Datum''' =


   
   
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'''Merging Scattersets'''  
= '''Merging Scattersets''' =


[[Image:NewOrleansDataset 49.png|400px]]
[[Image:NewOrleansDataset 49.png|400px]]
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'''Surface-water Modeling System (SMS)'''
= '''Surface-water Modeling System (SMS)''' =


'''Questions?'''
'''Questions?'''
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Tanya Beck
Tanya Beck
Tanya.m.beck@usace.army.mil  
Tanya.m.beck@usace.army.mil  
601-634-2603
   
   
Or
Or
   
   
Mitch Brown
Mitch Brown
Mitchell.e.brown@usace.army.mil  
Mitchell.e.brown@usace.army.mil
601-634-4036

Revision as of 15:06, 9 August 2023

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)

NewOrleansDataset 1.png

NewOrleansDataset 2.png


Common Spatial Reference Datum & Vertical Datum

NewOrleansDataset 52.png

NewOrleansDataset 53.png

NewOrleansDataset 3.png

NewOrleansDataset 4.png


Tides and Currents (NOAA)

https://tidesandcurrents.noaa.gov/ NewOrleansDataset 5.png

NewOrleansDataset 6.png

NewOrleansDataset 7.png

Vertical Datum Conversions

NewOrleansDataset 54.png


NewOrleansDataset 8.png

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

Reprojecting Coordinates and Changing Datums

NewOrleansDataset 9.png

Object Projection tells SMS what the coordinates are to be project in. This can modify the location that SMS will display the dataset. Checking “Specify” Project Projection is how coordinates are converted to a different projection and vertical datum.

Converting Elevations to Depths (CMS Requirement)

NewOrleansDataset 10.png

Data Transform Can adjust scatterset data by scaling, translating (adding/subtracting), or rotating horizontal or veritcal

NewOrleansDataset 11.png

Select Depths Elevations Flips negative elevations to positive depths. Necessary for CMS model calculation.

NAN Channel Surveys

NewOrleansDataset 12.png


  • Horizontal Datum:

State Plane NAD27 New Jersey 2900 (ft)

  • Vertical Datum:

MLW (ft) – COE Datum (not local NOAA benchmark)

Conversions

NewOrleansDataset 8.png

NAN Channel Surveys Extended in to Bay

NewOrleansDataset 13.png

NewOrleansDataset 15.png

NewOrleansDataset 54.png

  • Horizontal Datum:

State Plane NAD27 New Jersey 2900 (ft)

  • Vertical Datum:

MLW (ft) – COE Datum (not local NOAA benchmark)

Dataset Calculator

NewOrleansDataset 16.png

NewOrleansDataset 17.png

NewOrleansDataset 18.png

NewOrleansDataset 19.png

NJ DEP Channel Surveys

NewOrleansDataset 20.png

  • XYZ pulled out of drawing and changed to ascii format

NewOrleansDataset 21.png

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


Field Data Collection – Multibeam Bay Bathymetry (August 2009)

Horizontal Datum: State Plane NAD83 New Jersey 2900 (m) Vertical Datum: NAVD88 (m)


NewOrleansDataset 22.png

LIDAR

NewOrleansDataset 23.png

  • 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)

Coastal Relief Model (DTM/DEM)

NewOrleansDataset 24.png

NewOrleansDataset 25.png

NewOrleansDataset 26.png

NewOrleansDataset 27.png

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

Coastal Relief Model

NewOrleansDataset 28.png

  • Horizontal Datum:

Geographic NAD83

  • Vertical Datum:

MSL (m) – Not accurate for shallow bathymetry (used for offshore)

Extra Bathymetry

NewOrleansDataset 29.png

  • Convert shoreline shapefile in SMS
  • Horizontal Datum:

State Plane NAD83 New Jersey 2900 (ft)

NewOrleansDataset 30.png

  • Added extra bay contour (set to -0.75 m)

Convert a Shapefile to Map

NewOrleansDataset 31.png

  • Drag and drop the shapefile (.shp)

NewOrleansDataset 32.png

  • Highlight all Coastline Mapping – Shapes and Feature Objects

NewOrleansDataset 33.png

  • Turn off GIS Data Arcs generated where GIS polylines

Convert a Map to Scatter

NewOrleansDataset 34.png

  • Highlight all Arcs, Rt-Click Redistribute Vertices Specified Spacing (spacing in spatial coordinates)

NewOrleansDataset 35.png

  • Feature Objects Map à Scatter Include all feature points and vertices (vertices spacing was set to 10)

NewOrleansDataset 36.png

NewOrleansDataset 37.png

NewOrleansDataset 38.png

  • Modify as necessary (i.e. remove entrance channel shoreline because it is old seawall and jetty configuration – LIDAR used here)

Create a Contour Polyline in the Map Module

File:NewOrleansDataset 39.png

Select Default Coverage under Map Data

  • Type à Generic à Mapping/Observation/Shoals

NewOrleansDataset 40.png

  • Draw arcs (polylines) feature with tool

NewOrleansDataset 41.png

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

Create Scatterset Points from Map Data

NewOrleansDataset 42.png

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

NewOrleansDataset 43.png

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

NewOrleansDataset 44.png

NewOrleansDataset 45.png

NewOrleansDataset 46.png

All Files Referenced to Same Horizontal and Vertical Datum

NewOrleansDataset 47.png

NewOrleansDataset 48.png

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

Merging Scattersets

NewOrleansDataset 49.png

NewOrleansDataset 50.png

NewOrleansDataset 51.png

  • 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).

Surface-water Modeling System (SMS)

Questions?

Tanya Beck Tanya.m.beck@usace.army.mil

Or

Mitch Brown Mitchell.e.brown@usace.army.mil

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