Introduction (base directory)

O2A data is archived. The data structure for archiving is described here. The SENSOR's parameter codes (URNs, Uniform Resource Names), e.g. vessel:polarstern:hydrosweep_ds3 describes the base storage directory for this specific device. This base directory is defined by the metadata description in sensor.awi.de.   Examples for base directory:   vessel:polarstern:hydrosweep_ds3 , towed_systems:loki_10001_02

Subdevices of a base device are described in the sensor urn by adding the sub devices Short Name to the base device URN. E.g. towed_systems:loki_10001_02:microflu-chl_1228. Base device and subdevices are named items for simplicity reasons. Any nesting of items is possible. There is no restriction for nesting.

Examples for different level of nesting in Sensor URNs:

(type:item:item:item)  vessel:polarstern:tsk1:sbe38

(type:item:item) towed_systems:loki_10001_02:microflu-chl_1228  vessel:polarstern:hydrosweep_ds3

(type:item) towed_systems:loki_10001_02

Sensor URNs describe the data storage location in our archive. E.g. temperature data from the sbe38 sensor, from termosalinograph keel 1 tsk1, on vessel polarstern, are stored unter the root directory  /vessel/polarstern/tsk1/sbe38/.   Picture data from loki_10001_02 are archived under /towed_systems/loki_10001_02/. This is the base-directory.

Datastructure below Sensor URN base directory

The base-directory is given by the sensor urn. Expedition data is located under /base-directory/exdata   The level below /exdata/ describes the expedition and if applicable the science activity and device operation. 

Following schema shall be used for naming this subdirectory:  ( expedition _ scienceactivity - deviceoperation  e.g. PS85_444-2  for expedition PS85  science activity 444 and device operation 2).  This shall not be splitted into two directories!

examples: vessel/polarstern/hydrosweep_ds3/exdata/PS122.1/,  towed_systems/ofos_1/digital_camera/exdata/PS121_49-1/       TODO: _ is ambiguous if used for expedition_leg vs expedition_scienceactivity. _ shall therefore not be used in the expedition name for legs.  "." has to be used instead for splitting expeditions into several legs.

Examples for expeditions: PS120, PS122.1 (Expedition PS122 leg 1), MSM09_3, HE_400,