Update README.md

Author: ADRyanHorgan

README.md

@@ -1,14 +1,16 @@
 # Mission.Space Weather Extension Specification
 
 - **Title:** Mission.Space Weather Extension
-- **Identifier:** <>
+- **Identifier:** <https://github.com/AstrodynamicLimited/mission-space-weather/tree/main/json-schema/schema.json>
 - **Field Name Prefix:** ms_weather
 - **Scope:** Item, Collection
 - **Extension [Maturity Classification](https://github.com/radiantearth/stac-spec/tree/master/extensions/README.md#extension-maturity):** Proposal
 - **Owner**: @ADRyanHorgan
 
-This document explains the Template Extension to the [SpatioTemporal Asset Catalog](https://github.com/radiantearth/stac-spec) (STAC) specification.
-This is the place to add a short introduction.
+This document explains the Mission.Space Weather Extension to the [SpatioTemporal Asset Catalog](https://github.com/radiantearth/stac-spec) (STAC) specification.
+This is a work in progress extension, adding key field for Mission.Space's space weather data to the STAC specification.
+The data made available on STAC is open sample data from Mission.Space, showing high energy particle activity measured by the their Zohar-1 instrument during minor and major geomagnetic storms.
+The assets are currently available as csv files, but this can be amended subject to feedback.
 
 - Examples:
   - [Item example](examples/item.json): Shows the basic usage of the extension in a STAC Item
@@ -26,17 +28,18 @@ The fields in the table below can be used in these parts of STAC documents:
 - [ ] Assets (for both Collections and Items, incl. Item Asset Definitions in Collections)
 - [ ] Links
 
-| Field Name                          | Type    | Description                                                                           |
-| ------------------------------------| ------- | ------------------------------------------------------------------------------------- |
-| ms_weather:sensor_geometric_factor  | number  | **REQUIRED**. Geometric factor of one PL sensor on the ZOHAR-1 instrument.            |
-| ms_weather:sensor_surface_area      | number  | (m^2) Surface Area of one PL sensor on the ZOHAR-1 instrument.                        |
-| ms_weather:sensor_average_thickness | number  | (m) Average thickness of one PL sensor on the ZOHAR-1 instrument.                     |
-| ms_weather:sensor_count             | number  |**REQUIRED**. Number of one PL sensor on the ZOHAR-1 instrument.                       |
-| ms_weather:minimum_proton_energy    | number  |**REQUIRED**. (MeV) Minimum Proton Energy that is detected by the ZOHAR-1 instrument.  |
-| ms_weather:minimum_electron_energy  | number  |**REQUIRED**. (MeV) Minimum Electron Energy that is detected by the ZOHAR-1 instrument.|
-| ms_weather:measurement_interval     | number  |**REQUIRED**. (s) Time between each measurement.                                       |
+| Field Name                          | Type    | Description                                                                            |
+| ------------------------------------| ------- | -------------------------------------------------------------------------------------- |
+| ms_weather:sensor_geometric_factor  | number  | **REQUIRED**. Geometric factor of one PL sensor on the ZOHAR-1 instrument.             |
+| ms_weather:sensor_surface_area      | number  | (m^2) Surface Area of one PL sensor on the ZOHAR-1 instrument.                         |
+| ms_weather:sensor_average_thickness | number  | (m) Average thickness of one PL sensor on the ZOHAR-1 instrument.                      |
+| ms_weather:sensor_count             | number  | **REQUIRED**. Number of one PL sensor on the ZOHAR-1 instrument.                       |
+| ms_weather:minimum_proton_energy    | number  | **REQUIRED**. (MeV) Minimum Proton Energy that is detected by the ZOHAR-1 instrument.  |
+| ms_weather:minimum_electron_energy  | number  | **REQUIRED**. (MeV) Minimum Electron Energy that is detected by the ZOHAR-1 instrument.|
+| ms_weather:measurement_interval     | number  | **REQUIRED**. (s) Time between each measurement.                                       |
 
 ## Best Practices
+Units for each field should be included in the [units object](https://github.com/radiantearth/stac-spec/blob/master/commons/common-metadata.md#units) on both a collection and item.
 
 ## Contributing