Importing Bathymetric Datasets: Difference between revisions

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Limited bay bathymetry
Limited bay bathymetry


NOAA – Offshore datasets
* NOAA – Offshore datasets


LIDAR – Shoreline and nearshore (important for structure resolution)
* LIDAR – Shoreline and nearshore (important for structure resolution)


Channel
* Channel


NJ State maintains north channel and north bay channel
NJ State maintains north channel and north bay channel
Line 14: Line 14:
Federally maintained entrance and south channel (15 years)   
Federally maintained entrance and south channel (15 years)   


NAN-supported field data collection
* NAN-supported field data collection


Included bathymetry of the backbay (Spring High Tide)
Included bathymetry of the backbay (Spring High Tide)
Line 21: Line 21:


[[Image:NewOrleansDataset 2.png|200px]]
[[Image:NewOrleansDataset 2.png|200px]]


'''Common Spatial Reference Datum & Vertical Datum'''
'''Common Spatial Reference Datum & Vertical Datum'''
[[Image:NewOrleansDataset 52.png|350px]]
[[Image:NewOrleansDataset 53.png|350px]]


[[Image:NewOrleansDataset 3.png|350px]]
[[Image:NewOrleansDataset 3.png|350px]]
[[Image:NewOrleansDataset 4.png|350px]]
[[Image:NewOrleansDataset 4.png|350px]]
'''Tides and Currents (NOAA)'''
http://tidesandcurrents.noaa.gov/station_retrieve.shtml?type=Datums
[[Image:NewOrleansDataset 5.png|350px]]
[[Image:NewOrleansDataset 5.png|350px]]
[[Image:NewOrleansDataset 6.png|400px]]
[[Image:NewOrleansDataset 6.png|400px]]
[[Image:NewOrleansDataset 7.png|400px]]
[[Image:NewOrleansDataset 7.png|400px]]
'''Vertical Datum Conversions'''
[[Image:NewOrleansDataset 54.png|400px]]
[[Image:NewOrleansDataset 8.png|400px]]
[[Image:NewOrleansDataset 8.png|400px]]
'''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''' 
[[Image:NewOrleansDataset 9.png|400px]]
[[Image:NewOrleansDataset 9.png|400px]]
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)'''
[[Image:NewOrleansDataset 10.png|400px]]
[[Image:NewOrleansDataset 10.png|400px]]
Data Transform Can adjust scatterset data by scaling, translating (adding/subtracting), or rotating horizontal or veritcal 
[[Image:NewOrleansDataset 11.png|400px]]
[[Image:NewOrleansDataset 11.png|400px]]
Select Depths Elevations Flips negative elevations to positive depths. Necessary for CMS model calculation.
'''NAN Channel Surveys'''
[[Image:NewOrleansDataset 12.png|400px]]
[[Image:NewOrleansDataset 12.png|400px]]
*Horizontal Datum:
State Plane NAD27 New Jersey 2900 (ft)
*Vertical Datum:
MLW (ft) – COE Datum (not local NOAA benchmark)
'''Conversions'''
[[Image:NewOrleansDataset 8.png|400px]]
[[Image:NewOrleansDataset 13.png|400px]]
[[Image:NewOrleansDataset 13.png|400px]]
[[Image:NewOrleansDataset 14.png|400px]]
[[Image:NewOrleansDataset 14.png|400px]]

Revision as of 19:50, 27 December 2010

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)

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

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



NewOrleansDataset 13.png NewOrleansDataset 14.png NewOrleansDataset 15.png NewOrleansDataset 16.png NewOrleansDataset 17.png NewOrleansDataset 18.png NewOrleansDataset 19.png NewOrleansDataset 20.png NewOrleansDataset 21.png NewOrleansDataset 22.png NewOrleansDataset 23.png NewOrleansDataset 24.png NewOrleansDataset 25.png NewOrleansDataset 26.png NewOrleansDataset 27.png NewOrleansDataset 28.png NewOrleansDataset 29.png NewOrleansDataset 30.png NewOrleansDataset 31.png NewOrleansDataset 32.png NewOrleansDataset 33.png NewOrleansDataset 34.png NewOrleansDataset 35.png NewOrleansDataset 36.png NewOrleansDataset 37.png NewOrleansDataset 38.png File:NewOrleansDataset 39.png NewOrleansDataset 40.png NewOrleansDataset 41.png NewOrleansDataset 42.png NewOrleansDataset 43.png NewOrleansDataset 44.png NewOrleansDataset 45.png NewOrleansDataset 46.png NewOrleansDataset 47.png NewOrleansDataset 48.png NewOrleansDataset 49.png NewOrleansDataset 50.png NewOrleansDataset 51.png

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