Element Description
The Grid Mapping Names element identifies the grid scheme the data are originally distributed in (if the data is gridded).
Best Practices
Some Earth Observation (EO) data are distributed in a gridded format, which means that the data is organized into pre-defined, regularly spaced 2D or 3D areas. For EO data, each grid cell is usually associated with an area of coverage of the Earth's surface, making grids useful for purposes of locating data and data interoperability. Outputs of numerical models and analyses of observational data are some examples of data that might be gridded. Grid schemes are defined by various parameters such as the size of the grid cells, number of grid cells present, and the corresponding location to the Earth's surface. Some grid schemes have names; however, this field can also be leveraged to provide a brief explanation/ specification of the grid the data is provided in if the grid scheme does not have an official name. Bear in mind that the grid name provided in this element must match a grid that has been defined in the parent collection. Providing a grid name is optional and can be repeated if the data are distributed in multiple grid formats. There is no controlled vocabulary for this field, so it is advised that a consistent grid naming convention be adopted for all metadata records coming from the same data provider.
Examples:
GridMappingNames: "MODIS Sinusoidal Tile Grid", "Lambert Azimuthal Equal-Area"
GridMappingNames: "0.25 - degree latitude x 0.25 - degree longitude US grid (300x120)"
Element Specification
Grid Mapping Names is optional in UMM-G, multiple grid names may be provided (Cardinality: 0..*)
Model | Element | Type | Constraints | Required? | Cardinality |
---|---|---|---|---|---|
UMM-G | GridMappingNames | Array composed of: Strings | 1 - 1024 characters | No | 0..* |
Metadata Validation and QA/QC
All metadata entering the CMR goes through the below process to ensure metadata quality requirements are met. All records undergo CMR validation before entering the system. The process of QA/QC is slightly different for NASA and non-NASA data providers. Non-NASA providers include interagency and international data providers and are referred to as the International Directory Network (IDN).
Please see the expandable sections below for flowchart details.
Dialect Mappings
UMM Migration
UMM Version 1.4.0 | Translation Direction | UMM Version 1.5.0 |
---|---|---|
History
UMM Versioning
Version | Date | What Changed |
---|---|---|
1.6.0 | 11/4/2019 | No changes were made for Grid Mapping Names during the transition from version 1.5.0 to 1.6.0. |
1.5.0 | 01/30/2019 | No changes were made for Grid Mapping Names during the transition from version 1.4.0 to 1.5.0. |
1.4.0 | 08/01/2018 |
ARC Documentation
Version | Date | What Changed | Author |
---|---|---|---|
1.0 | 04/12/2019 | Recommendations/priority matrix transferred from internal ARC documentation to wiki space |