# Terms and acronyms used in this documentation

| Term     | Expansion                                                                                                                                                                      | More Info                                                                                                                                          |
|----------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------|
| Airflow  | A Workflow management system                                                                                                                                                   | [Wikipedia](https://en.wikipedia.org/wiki/Apache_Airflow)                                                                                          |
| AirNow   | US Government source for air quality data                                                                                                                                      | [Website](https://www.airnow.gov/)                                                                                                                 |
| AQS      | Air Quality System: US Government source for air quality data                                                                                                                  | [Website](https://www.epa.gov/aqs)                                                                                                                 |
| CCW      | Chronic Condition Data Warehouse                                                                                                                                               | [Website](https://www.healthypeople.gov/2020/data-source/chronic-condition-data-warehouse)                                                         |
| CMS      | Centers for Medicare & Medicaid Services                                                                                                                                       | [Website](https://www.cms.gov/)                                                                                                                    |
| CRS      | Coordinate reference system                                                                                                                                                    | [Wikipedia](https://en.wikipedia.org/wiki/Spatial_reference_system)                                                                                |
| CSV      | File format, comma separated values                                                                                                                                            | [Wikipedia](https://en.wikipedia.org/wiki/Comma-separated_values)                                                                                  |
| CWL      | Common Workflow Language                                                                                                                                                       | [Wikipedia](https://en.wikipedia.org/wiki/Common_Workflow_Language) and [Website](https://www.commonwl.org/v1.2/)                                  |
| DBMS     | Database Management System                                                                                                                                                     | [Wikipedia](https://en.wikipedia.org/wiki/Database#Database_management_system)                                                                     |
| EPA      | U.S. Environmental Protection Agency                                                                                                                                           | [Website](https://www.epa.gov/)                                                                                                                    |
| EPSG     | The IOGP's EPSG Geodetic Parameter Dataset is a collection of definitions of coordinate reference systems and coordinate transformations. 4326 is the EPSG identifier of WGS84 | [Website](https://epsg.org/home.html)                                                                                                              |
| FST      | File format used by R                                                                                                                                                          | [Description](https://www.fstpackage.org/)                                                                                                         |
| FTS      | File Transfer Summary, often created by SAS                                                                                                                                    | [More details](fts)                                                                                                                                |
| gridMET  | a dataset of daily high-spatial resolution surface meteorological data                                                                                                         | [Website](http://www.climatologylab.org/gridmet.html)                                                                                              |
| HDF5     | File format (hierarchical)                                                                                                                                                     | [Wikipedia](https://en.wikipedia.org/wiki/Hierarchical_Data_Format) and [Website](https://www.hdfgroup.org/)                                       |
| HLL      | HyperLogLog is an algorithm for approximating the number of distinct elements in resulting query                                                                               | [Wikipedia](https://en.wikipedia.org/wiki/HyperLogLog)                                                                                             |
| MAX data | Medicaid Medicaid Analytic eXtract (MAX) data                                                                                                                                  | [Information](https://www.cms.gov/Research-Statistics-Data-and-Systems/Computer-Data-and-Systems/MedicaidDataSourcesGenInfo/MAXGeneralInformation) |
| OOM      | Out of Memory Error                                                                                                                                                            |                                                                                                                                                    |
| SAS      | Statistical Analysis System, a popular software tool                                                                                                                           | [Wikipedia](https://en.wikipedia.org/wiki/SAS_(software)) and [Company website](https://www.sas.com/)                                              |
| SQL      | Structured Query Language                                                                                                                                                      | [Wikipedia](https://en.wikipedia.org/wiki/SQL)                                                                                                     |
| WGS 84   | The World Geodetic System (WGS) is a standard for use in cartography, geodesy, and satellite navigation including GPS. 4326 is the EPSG identifier of WGS84                    | [Wikipedia](https://en.wikipedia.org/wiki/World_Geodetic_System) and [documentation](http://www.unoosa.org/pdf/icg/2012/template/WGS_84.pdf)       |