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DChart

How to use DChart.

The following explains the steps of accessing data using DChart.

Select a dataset on a DChart page:

• Public data
• IPRC only (password required)

Select the line with "NLOM" under Category and "ssh" under Dataset:

• NRL NLOM 1/32° 30day delayed Nowcast
  

Select SSH:

• Highlight "sea surface height [cm]"

This first example shows how to make a XY plot. Select the geography region and times of interest:

• Default options:
  • Plot type: 2D plot
  • Plot view: longitude/latitude (xy)
  • Plot options: Raster
  • Auto range: [checked]
• Type Lon-Lat:
  Lon: 195 207
  Lat: 18 24
  It will automatically change to:
  Lon: -165.00 -153.00
  Lat: 18.00 24.00
  
• Type time: 03 Oct 2007 00:00:00
• Click "Plot Selected"
• It will plot the graph

This next example explains how to download a NetCDF file. Select the geography region and times of interest:

• Select options:
  • Plot type: Export data
  • Plot view: xyt
  • Data download format: netCDF
• Type Lon-Lat:
  Lon: 195 207
  Lat: 18 24
  It will automatically change to:
  Lon: -165.00 -153.00
  Lat: 18.00 24.00
  
• Type time: 01 Oct 2007 00:00:00
                   31 Oct 2007 00:00:00
• Click "Plot Selected"
• It will download the NetCDF file (*.nc)

The following example shows how to make a time series plot of sea level from 4 stations in Hawaii (Oahu and Maui). Select the dataset UH Sea Level daily:

• Default options:
  • Plot type: Time series plot
• Type Lon-Lat:
  Lon: 201 205
  Lat: 20 22
  It will automatically change to:
  Lon: -159.00 -155.00
  Lat: 20.00 22.00
  Click "Apply"
  
• This region covers 4 stations for Hawaii (Oahu and Maui)
  Use the Set button [rectangle button on the map left-upper corner] to drag selected all 4 stations for Hawaii
• Default time: 01 Jan 1985 00:00:00
                     31 May 2010 00:00:00
• Click "Plot Selected"
• It will plot the graph with 4 different colors