Import: Ferret

1
Import Ferret

• Ferret is an interactive computer visualization
  and analysis tool

• designed for oceanographers and meteorologists
  analysing large and complex grided data sets

• runs on most Unix systems, and on Windows using X
  windows for display

• comes with built-in support for accessing OPeNDAP
  datasets

2
Import Ferret Example 1
This example plots AVHRR sea surface temperatures
for the period 2-12 January 1995, using data from
the WOCE3 dataset

• tpac/home/hylandggt ferret
• NOAA/PMEL TMAP
• FERRET v5.80
• Linux(g77) 2.4.20 - 01/03/05
• 11-Jul-06 1542

yes? use "http//dods.acecrc.org.au/.../woce3/sat_
sst/avhrr/data/10_deg/sst10d19950107.nc"

• yes? show data
• currently SET data sets
• 1gt http//dods.acecrc.org.au/.../woce3/sat_sst/avh
  rr/data/10_deg/sst10d19950107.nc (default)
• name title I
  J K L
• WOCE_DATE WOCE date ...
  ... ... 11
• WOCE_TIME WOCE time ...
  ... ... 11
• DEPTH depth ...
  ... ... 11
• SST sea surface temperature
  1360 1180 ... ...

yes? shade sst
3
Import Ferret Output 1
4
Import Ferret Example 2
This next example plots combined bathymetric and
topographic data from the Climatologies dataset
in the TPAC/CSIRO Oceanographic catalogue
yes? use "http//www.marine.csiro.au/.../dods-data
/climatology-netcdf/terrainbase.nc

• yes? show data
• currently SET data sets
• 1gt http//www.marine.csiro.au/.../dods-data/clim
  atology-netcdf/terrainbase.nc (default)
• name title I
  J K L
• HEIGHT height above sea level 14320
  12161 ... ...

yes? shade heighti143205,j121615
Note sampling every 5th value in both I and J
dimensions only downloading 1/25th (or 4) of
the 18Mb data file
5
Import Ferret Output 2
6
Import Ferret Example 2 cont.
yes? shade
/paletteland_sea
/levels"(-8000) (-6000,0,600) (0,2000,200)
(6000)
/paletteland_sea
/levels"(-8000) (-6000,0,600) (0,2000,200)
(6000)
heighti143205,j121605
heighti143205,j121605
7
Import Ferret Example 2 cont.
yes? shade/paletteland_sea/levels"(-8000)
(-6000,0,600) (0,1000,100) (7000)
heightx100160,y-50-10
Now sampling using x and y axis
information data with longitudes between 100ºE
and 160ºE, and latitudes between 50ºS and 10ºS
8
Import Ferret Example 3
use "http//www.marine.csiro.au/dods/nph-dods/dods
-data/climatology-netcdf/terrainbase.nc"
set memory/size50 set grid height
Loads height data as ferret dataset 1 d1
go mp_orthographic 100 -60 go mp_aspect
set window/clear/size2.5/aspect1
shade/levels"(-200,3200,100) (3200,8200,2500)
/noaxis/nolabels/palettedark_terrestrial/n
okey heightmp_mask,x_page,y_page
9
Import Ferret Example 3
use "average_eta.nc"
Loads eta (average) data as ferret dataset 2
d2
use "http//store.apac.edu.au/.../g11/variable_for
cing/snapshots/snapshot.eta.1982.03.15.nc"
Loads eta (daily) data as ferret dataset 3 d3
set grid eta go mp_orthographic 100 -60
Anomaly Daily snapshot minus the average
let eta_anom etad3 - etad2
shade/levels(-inf) (-50,50,4) (inf)
/noaxis/nolabels/palettemark_how1/nokey/overlay
eta_anommp_mask,x_page,y_page
10
Import Ferret Output 3