# Formating CDF files for AMDADB

This specification follows the ISTP guidelines, see [the ISTP guide](https://spdf.gsfc.nasa.gov/istp_guide/).

---

## Global CDF attributes

See [the ISTP guidelines for global attributes](https://spdf.gsfc.nasa.gov/istp_guide/gattributes.html).

### Acknowledgement

Value of node `NumericalData/ResourceHeader/Acknowledgement` from SPASE file *NumericalData* corresponding to the granule.

> **Ex:**
>
>     NASA, Prof. Henri Reme, European Space Agency

### Data_type

Dataset name

> **Ex:**
>
>     PRP

### Data_version

    1

### Descriptor

Instrument name

> **Ex:**
>
>     CIS

### Discipline

- If target name is `sun` or `earth` : ***Space Physics***
- otherwise, look for node value of `NumericalData/ObservedRegion` from the *NumericalData* SPASE file corresponding to the granule:
	- if it's `Magnetosphere`: ***Space Physics>Magnetospheric Science***;
	- if it's `NearSurface`: ***Space Physics>Ionospheric Science***;
	- if it's `Heliosphere`: ***Space Physics>Interplanetary Studies***.

### Generated_by

    CDPP>Centre de Donnees de la Physique des Plasmas

### Generation_date

Value of node `NumericalData/ResourceHeader/ReleaseDate` from the *NumericalData* SPASE file corresponding to the granule, formated as *yyyymmdd*.

> **Ex:**
>
>     20151019

### HTTP_LINK

    http://amda.cdpp.eu

### Instrument_type

Value of node `Instrument/InstrumentType` from the *Instrument* SPASE file corresponding to the granule.

> **Ex:**
>
>     ElectrostaticAnalyser

### LINK_TEXT

Value of node `NumericalData/ResourceHeader/AlternateName` from the *NumericalData* SPASE file corresponding to the granule **+** ` data are available at `.

> **Ex:**
>
>     Cluster 1 Prime Parameter CIS data data are available at

### LINK_TITLE

    CDPP AMDA DATABASE

### Logical_file_id

Dataset name **+** `_` **+** `start_time` epn-core value, formated as `YYYYMMDDHHMMSS`.

Note: This is actually the file name without extension.

> **Ex**
>
>     CLUST1_CIS_PRP_19900302040000

### Logical_source

Dataset name

> **Ex:**
>
>     CLUST1_CIS_PRP

### Logical_source_description

Value of node `NumericalData/ResourceHeader/Description` from the *NumericalData* SPASE file corresponding to the granule.

> **Ex:**
>
>     This instrument (CIS: Cluster Ion Spectrometry) is capable of obtaining full 3D ion distributions with high time resolution (in one spacecraft spin) and mass-per-charge resolution. The experiment consists of [...]

### Mission_group

- Last element of the value of node `Observatory/ObservatoryGroupID` from the *Observatory* SPASE file corresponding to the granule.
- if the node doesn't exist: value of node `Observatory/ResourceName`.

> **Ex:**
>
>     Cluster

### MODS

    Extracted from NetCDF AMDA internal data.

### Parents

The NetCDF file name.

> **Ex**
>
>     CLUST1_CIS_PRP_19900302040000.nc

### PI_affiliation

Value of node `Person/OrganisationName` from the *Person* SPASE file corresponding to the granule.

> **Ex**
>
>     ESTEC, ESA

### PI_name

Value of node `NumericalData/Contact/PersonID` where `Role` node value is `PrincipalInvestigator`, from the *NumericalData* SPASE file corresponding to the granule.

> **Ex:**
>
>     Henri.Reme

### Project

A list with:

- `CDPP>Centre de Donnees de la Physique des Plasmas`
- the value of node `NumericalData/ProviderName`, from the *NumericalData* SPASE file corresponding to the granule.

> **Ex:**
>
>     - CDPP>Centre de Donnees de la Physique des Plasmas
>     - CSDS-CNES

### Rules_of_use

    System Use Policy

    Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse."

	Data use policy from originating <NAME> data center: <URL>

where :
- <NAME> is the value of node `NumericalData/ProviderName` from the SPASE file *NumericalData* corresponding to the granule, or CDPP if the value doesn't exist.
- and <URL> is kept from this dictionary (according to <NAME>).

- CDPP: http://amda.irap.omp.eu/help/licenceAction.do.html
- CDAWEB: http://spdf.gsfc.nasa.gov/new_users.html
- PDS: http://ppi.pds.nasa.gov/citations_policy.jsp
- MAPSKP: http://mapskp.cesr.fr/use_policy
- THEMIS: http://themis.ssl.berkeley.edu/roadrules.shtml
- MAVEN: http://lasp.colorado.edu/home/maven/files/2014/09/MAVEN_public-rules-of-the-road-v3.pdf
- CASSINI/RPWS/SKR: http://amda.irap.omp.eu/help/SKR.html
- VEXGRAZ: http://amda.irap.omp.eu/help/VEXGRAZ.html
- CAA: http://caa.estec.esa.int/caa/ror.xml
- CSA: http://www.cosmos.esa.int/web/csa/rules-of-the-road
- STEREO: http://amda.irap.omp.eu/help/STEREO.html
- CCMC: http://ccmc.gsfc.nasa.gov/PubPolicy.php


> **Ex:**
>
>     System Use Policy
>     
>     Thank you for acknowledging the use of AMDA in publications with wording like "Data analysis was performed with the AMDA science analysis system provided by the Centre de Données de la Physique des Plasmas (CDPP) supported by CNRS, CNES, Observatoire de Paris and Université Paul Sabatier, Toulouse."
>     
>     Data use policy from originating CDPP data center: http://amda.irap.omp.eu/help/licenceAction.do.html

### Software_version

Version of the NetCDF to CDF converter.

### Source_name

The mission name

> **Ex:**
>
>     clust1

### TEXT

The value of node `NumericalData/ResourceHeader/InformationURL/Name` **+** `, ` **+** the value of node `NumericalData/ResourceHeader/InformationURL/URL`, from the SPASE file *NumericalData* corresponding to the granule.

> **Ex:**
>
>     NSSDC Master Catalog listing for Cluster II Rumba Cluster Ion Spectrometry (CIS), http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=2000-045A-02

### Time_resolution

`time_sampling_step` value of epn-core, in seconds + ` seconds`.

> **Ex:**
>
>     3 seconds

### TITLE

The value of node `NumericalData/ResourceHeader/AlternateName`, from the SPASE file *NumericalData* corresponding to the granule.

> **Ex:**
>
>     Cluster 1 Prime Parameter CIS data

### PDS_Start_time

`time_min` value of epn-core, in ISO time.

> **Ex:**
>
>     2007-02-13T09:08:43Z

### PDS_Stop_time

`time_max` value of epn-core, in ISO time.

> **Ex:**
>
>     2007-02-14T09:08:43Z

### PDS_Observation_target

`target_name` value of epn-core. Use a list of values if necessary (split the `#` character).

> **Ex:**
>
>     Saturn

### Observation_type

Look for the child node in `NumericalData/Parameter` node, from the SPASE file *NumericalData* corresponding to the granule.

It is one of: `Field`, `Particules`, `Wave`, `Mixed`, `Support`.

> **Ex:**
>
>     Particle

### Other epn-core parameters

Add other epn-core parameters, with `VESPA_` prefix, only if:
- the value is not empty;
- this is not the same value as the other element of a tuple (ie min/max).

> **Ex:**
>
>     - VESPA_spase_measurement_type: EnergeticParticles
>     - VESPA_spatial_frame_type: cartesian

---

## Variable attributes (TBC)

See [the ISTP guidelines for variables](https://spdf.gsfc.nasa.gov/istp_guide/variables.html).

To create new variables with [spacepy.pycdf)(http://pythonhosted.org/SpacePy/pycdf.html), use [cdf.new()](http://pythonhosted.org/SpacePy/autosummary/spacepy.pycdf.CDF.html#spacepy.pycdf.CDF.new) and not `attr[]`.

To name variables, use the `NumericalData/Parameter/ParameterKey` parameter from the SPASE file.

### `CATDESC`

type: CDF_CHAR

The value of node `NumericalData/Parameter/Description`.

> **Ex**
>
>     Flux density spectrogram measured on the RH polarized array.

### DEPEND_0

type : CDF_CHAR

    Epoch

### LABL_PTR_1

Note: Only if the node value of `NumericalData/Parameter/RenderingHints` is `time series` and the node `NumericalData/Parameter/Structure` exist.

Note 2: `LABL_PTR_1` and `DEPEND_1` can not are both presents.

**Step 1:** Get the labels, which are the nodes value of `NumericalData/Parameter/Structure/Element/Name`.

> **Ex (for skr151150000.nc.gz):**
>
>     - RH 100-400kHz
>     - LH 100-400kHz
>     - RH 10-1000kHz
>     - RH 10-1000kHz

**Step 2:** Create a new variable stored with these labels. Then `LABL_PTR_1` is the ID of this variable.

### DEPEND_1

Note: Only if the node value of `NumericalData/Parameter/RenderingHints` is `spectrogram`.

Note 2: `LABL_PTR_1` and `DEPEND_1` can not are both presents.

type : CDF_CHAR

From the file `<dataset_name>_info` from the dataset directory, look for `energy` or `frequency` variables value.

### DICT_KEY

type: CDF_CHAR

> **Ex:**
>
>     electric_field>power

### DISPLAY_TYPE

type: CDF_CHAR

> **Ex:**
>
>     time_series

### FIELDNAM

type: CDF_CHAR

> **Ex:**
>
>     RR

### FILLVAL

type: CDF_UINT1

> **Ex:**
>
>     255

### LABLAXIS

type: CDF_CHAR

> **Ex:**
>
>     RH flux density

### UNITS

type: CDF_CHAR

> **Ex:**
>
>     dB

### VALIDMIN

type: CDF_UINT1

> **Ex:**
>
>     0

### VALIDMAX

type: CDF_UINT1

> **Ex:**
>
>     255

### VAR_TYPE

type: CDF_CHAR

> **Ex:**
>
>     data

### SCALETYP

type: CDF_CHAR

> **Ex:**
>
>     lin

### SCALEMIN

type: CDF_UINT1

> **Ex:**
>
>     0

### SCALEMAX

> **Ex:**
>
>     255

### UCD