> For the complete documentation index, see [llms.txt](https://docs.terraref.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.terraref.org/beta/technical-documentation/data-product-creation.md).

# Data Product Creation

## Data Product Levels

Data products are processed at various levels ranging from Level 0 to Level 4. Level 0 products are raw data at full instrument resolution. At higher levels, the data are converted into more useful parameters and formats. These are derived from NASA and NEON

| Level | Description                                                                                                                                               |   |
| ----- | --------------------------------------------------------------------------------------------------------------------------------------------------------- | - |
| 0     | Reconstructed, unprocessed, full resolution instrument data; artifacts and duplicates removed.                                                            |   |
| 1a    | Level 0 plus time-referenced and annotated with calibration coefficients and georeferencing parameters (level 0 is fully recoverable from level 1a data). |   |
| 1b    | Level 1a processed to sensor units (level 0 not recoverable)                                                                                              |   |
| 2     | Derived variables (e. g., NDVI, height, fluorescence) at the level 1 resolution.                                                                          |   |
| 3     | Level 2 mapped to uniform grid, missing points gap filled; overlapping images combined                                                                    |   |
| 4     | 'phenotypes' derived variables associated with a particular plant or genotype rather than a spatial location                                              |   |

1 [Earth Observing System Data Processing Levels, NASA](http://science.nasa.gov/earth-science/earth-science-data/data-processing-levels-for-eosdis-data-products/)\
2 [National Ecological Observatory Network Data Processing](http://www.neoninc.org/science-design/data-processing)