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

4. FDS URLs (beyond OPeNDAP)
expression syntax
dataset2,…}{expression1;expression2;…} {region}.URLsuffix?constraint
regridding example
_expr_{small_coads,small_levitus} {define grid/like=SST cg; A=SST[d=1]-TEMP[d=2,g=cg]}.asc?A

5. FDS Tutorial: subsetting
yes? use ”
yes? show data …
yes? shade sst[i=1:180:4,j=1:90:4,l=9]
yes? set region/x=180:280/y=0:60/t=“15-sep”
yes? shade sst

6. FDS Tutorial: expressions
yes? cancel data/all
yes? cancel region
yes? use “
yes? show data …
yes? shade sst_ave

7. FDS Tutorial: regridding
Browser access
_expr_{small_coads,small_levitus} {define grid/like=SST cg; A=SST[d=1]-TEMP[d=2,g=cg]}.info?A
Ferret access
yes? use “ _expr_{small_coads,small_levitus} {define grid/like=SST cg; A=SST[d=1]-TEMP[d=2,g=cg]}”

8. FDS Configuration confguration file data directory data cache
/usr/local/fds/fds/fds.xml
data directory
./testdata
data cache
./temp/fds/
Setting up our chlorophyll dataset