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A new set of tools for all altimetry users. J. Benveniste (ESA), N. Picot (CNES), V. Rosmorduc (CLS) et al. Basic Radar Altimetry Toolbox & Tutorial. A Joint project between ESA and CNES Statements: 16 years of altimetry available and at least as many data formats as satellites,

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a new set of tools for all altimetry users

A new set of tools for all altimetry users

J. Benveniste (ESA), N. Picot (CNES), V. Rosmorduc (CLS) et al.

basic radar altimetry toolbox tutorial
Basic Radar Altimetry Toolbox & Tutorial
  • A Joint project between ESA and CNES
  • Statements:
    • 16 years of altimetry available and at least as many data formats as satellites,
    • A growing number of non-expert users of the data,
    • Scientists also need easy-to-use data products and tools!
  • Basic Radar Altimetry Toolbox (BRAT)
    • Data reading, processing and visualisation
    • All altimetry data from official data centres since ERS-1 (1991)
  • Radar Altimetry Tutorial (RAT)
    • A tutorial describing altimetry, for the users
    • technique, applications and missions
    • Products fact sheets and data use cases
  • Available on the web (http://www.altimetry.info, http://earth.esa.int/brat/), or on DVD
slide3

BRAT Data import & export

ERS-1

Sensor data

  • Output NetCDF
  • Ascii dump possible
  • Image export (png, tif, jpg, bmp)

Topex/Poseidon

Along-track

ERS-2

GFO

Jason-1

Envisat

Gridded data

Cryosat

radar altimetry tutorial
Radar Altimetry Tutorial
  • Applications
    • Geodesy & solid Earth
    • Ocean
    • Ice
    • Climate
    • Weather
    • Hydrology & land
    • Coastal
  • Data use cases
  • Altimetry
    • How it works
    • Data flow
    • Future improvements
  • Altimetry missions
    • Past missions
    • Current missions
    • Future missions
  • Products
    • Data
    • Software
    • Documentation
    • Toolbox

http://www.altimetry.info

http://earth.esa.int/brat/

basic radar altimetry toolbox software
Basic Radar Altimetry Toolbox software
  • Windows & Linux
  • Open source

Data read & processed:

  • From several satellitesERS-1 and 2, Topex/Poseidon, Geosat Follow-on, Jason-1, Envisat, and the future Cryosat missions.
  • From several data centres ESA, Aviso, JPL/PoDaac, Noaa
  • Of several processing levelsfrom Sensor Geophysical Data Record to gridded merged data
  • Present version: v1.0.2
software accessible at different levels
Software accessible at different levels

core functions (available from C, Fortran, Matlab, IDL APIs)

Data reading

Select, compute and visualise data using command line mode with parameter files

.exe files

Graphical User Interface (GUI):use the toolbox through a windowed interface

GUI

formulas saving expressions and selections
Formulas: saving expressions and selections
  • Formulas are combinations of data fields and functions (including arithmetic operators, + - / *)
  • Use:
    • as a ‘data expression’: to compute a combination of data fields (e.g. Sea Surface Height)
    • or as a data selection: to do a complex selection on the data fields
  • Pre-defined formulas can be used (Sea Surface Height, Sea Level Anomalies, ocean data editing for all satellite GDRs are built-in)
  • User-made formulas can be saved and re-used in either the same workspace, or imported in another one Formulas can be exchanged between users
data visualisation

Curves

Maps (different projections)

Data visualisation
slide11

Statistics

+ Minimum,

Maximum

Mean Sea Level Anomalies for November 1997

slide12

Hurricane Katrina

Envisat

Jason-1 & T/P

GFO

slide13

Southern swell, May 2007

Jason-1 OSDR, 12 May 2007

slide15

Sea level anomaly seasonal variations

Spring

Autumn

- 15

+ 15 cm

Winter

Summer

slide16

Zoom

Kinetic Energy on 17 August 2005

for more information
For more information

www.altimetry.infowith a mirror on

earth.esa.int/brat/