Exploring PMEL EPIC Profile Data With Java OceanAtlas (JOA). John R. Osborne

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: 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’ files Save 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 Contacts or Mick Spillane or any of the EPIC team (Nancy, Don or Willa) On-line Help JavaJOA.htm