Ferret Data Server FDS

1
Ferret Data Server (FDS)

• Ferret as an OPeNDAP server

2
Based on Anagram

• Eases server development
• provides reusable components for
• responding to OPeNDAP API
• managing back end process space
• error handling
• abuse filtering

3
FDS Features

• OPeNDAP API
• Abuse filters
• XML based configuration files
• Ferret journal scripts can be used to synthesize
  datasets
• URL syntax for server side calculations
• FDS documentation
• http//ferret.pmel.noaa.gov/FDS/

4
FDS URLs (beyond OPeNDAP)

• expression syntax
• http//machineport/FDS/_expr_dataset1,dataset2,
  expression1expression2 region.URLsuffix?c
  onstraint
• regridding example
• http//stout.pmel.noaa.gov9090/FDS/_expr_small_
  coads,small_levitusdefine grid/likeSST
  cgASSTd1-TEMPd2,gcg.asc?A

5
FDS Tutorial subsetting

• yes? usehttp//address9090/FDS/coads_local
• yes? show data
• yes? shade ssti11804,j1904,l9
• yes? set region/x180280/y060/t15-sep
• yes? shade sst

6
FDS Tutorial expressions

• yes? cancel data/all
• yes? cancel region
• yes? use http//address9090/FDS/_expr_coads_lo
  calSST_AVESSTl_at_ave
• yes? show data
• yes? shade sst_ave

7
FDS Tutorial regridding

• Browser access
• http//address9090/FDS/_expr_small_coads,small_
  levitusdefine grid/likeSST cgASSTd1-TEMP
  d2,gcg.info?A
• Ferret access
• yes? use http//address9090/FDS/_expr_small_co
  ads,small_levitusdefine grid/likeSST
  cgASSTd1-TEMPd2,gcg

8
FDS Configuration

• confguration file
• /usr/local/fds/fds/fds.xml
• data directory
• ./testdata
• data cache
• ./temp/fds/
• Setting up our chlorophyll dataset
• http//pet01.pet.navo.hpc.mil/