exploring pmel epic profile data with java oceanatlas (joa). john r. osborne
TRANSCRIPT
Exploring PMEL EPIC Profile Data With Java OceanAtlas (JOA).
John R. Osborne
http://www.pmel.noaa.gov/epic/software/JavaJOA.htm
Overview of JOA Features• Cross Platform
– Windows, Solaris, Mac OS 9/X, Linux
Overview of JOA Features• Sophisticated exploration of profile data
– Linked browsing between all plot types – User interface is friendly, but offers many options– Color as a third variable– All plots resizeable and zoomable– No limit on number of open windows– Informative default interface– Full user customization– Program resources saved in XML format– Includes NdEdit for data selection from large data
collections– Large number of supported profile data formats for
bottle and CTD data
Overview of JOA Features• Data Window
– Measured data and station metadata at current browsing point
– Graphical cross-section– Display units and color data
display by quality codes (WOCE or IGOSS)
– Color cross-section by bottle quality code (if present)
– Display current color variable
Overview of JOA Features• Property-Property Plots
– Property-property plots with up to 3 x-axes– Isopycnal overlay
Overview of JOA Features• Profile Plots
– Offset property-property profiles (waterfall plots)
Overview of JOA Features• Contour Plots
– Contoured sections (e.g., depth sections)– Referenced and residual contour plots
Overview of JOA Features• Map Plots
– Multiple projections – Station symbols colored by properties interpolated onto
multiple surfaces (e.g., pressure or density)– Bathymetry display: isobaths, ETOPO, Sandwell-Smith– Tools to create custom sections
Overview of JOA Features
• Station Value Plots– Station plots of mixed-layer calculations and
integrals
Overview of JOA Features
• Calculations– Observation Calculations
• Theta, sigma(0)-sigma(n), NO, PO, AOU, Spiciness, O2 % saturation, alpha, beta, specific volume anomaly, heat storage, sound velocity, B-V frequency, squared B-V frequency, potential vorticity
• Integrals of acoustic travel time, net heat content, potential energy anomaly, geopotential anomaly
– Custom Calculations• Arithmetic expressions• Derivatives• Transformations
– Station Calculations• Mixed-layer depth • Integral/weighted average of variable
between surfaces
Overview of JOA Features• Data Filtering
• Station Filters– Include/exclude individual
stations/sections– Exclude stations missing
observations of selected variable
– Include stations in geographical region
• Observation Filters– Up to four criteria– Boolean logic (and/or) can be
applied to filter criteria – Observations that meet filter
criteria can be viewed, highlighted, or removed from plots
– Useful for data quality control
Overview of JOA Features
• Customization– Color bars– Color palettes– Interpolation surfaces– Custom coastlines and
bathymetry– Saved map settings– CTD Decimation
• Fixed levels, JOA surface levels, or custom levels
– Sophisticated import of WOCE “Exchange” files
Overview of JOA Features• Integrated into the
EPIC environment– Reads EPIC pointer
files created by “epicselect” or EPIC web interface
– Writes EPIC pointer files
– On-line help for EPIC users: http://www.pmel.noaa.Gov/epic/software/JavaJOA.htm
Overview of JOA Features• New ‘NdEdit’ function
– Linked windows for browsing station locations in time/space– Overlay bathymetry in map (lat/lon) view– Filter in time or space– Select stations with box, polygon, segmented section line– Retain or delete filtered stations– Save EPIC pointer files– Open selected files directly in JOA
Java Ocean Atlas Input/Output
New simplified CSV ‘WHP-Exchange’
files
‘Spreadsheet’ filesSave in these types
• Reads and writes many file types• Including EPIC pointer files
JOA Demo
The Near Future: JOA 3.5• Latitude/Longitude axes for contour and profile
plots• Map improvements• Better control of missing values in contour plot
interpolations• Java 2 platform graphics• Mac OS X integration• Available March, 2002
The Future• Velocity calculations• Multi-layer contoured sections• JOA for all in-situ data types• Some features available by mid-late-2002
Using JOA in the EPIC Environment
[email protected] or [email protected]
Mick Spillane or any of the EPIC team (Nancy, Don or Willa)
On-line Helphttp://www.pmel.noaa.gov/epic/software/
JavaJOA.htm