# Product Details

## Level-1 Imagery

The Level-1A data product is the least processed of the available imagery. It includes processing applied onboard the instrument, such as time delay integration and non-uniformity corrections, as well as co-registration of sensor bands and georegistration. The full swath data is provided to users in image space with no resampling. Coefficients needed to convert digital number (DN) values to radiance are available in metadata.

The Level-1B product includes clipping the VIRI data to the extent of the LIRI swath, generation of a cloud mask, and orthorectification.

<table data-header-hidden><thead><tr><th width="221">Item</th><th valign="top">Details</th></tr></thead><tbody><tr><td><strong>L1 Product Granule Size</strong></td><td valign="top"><p>L1A VIRI: 122 km x 70 km</p><p>L1A LIRI: 70 km x 70 km</p><p>L1B: Combined 70 km x 70 km</p></td></tr><tr><td><strong>L1 Pixel Size</strong></td><td valign="top"><p>L1A VIRI: 29.9 m</p><p>L1A LIRI: 68.8 m</p><p>L1B: 30 m</p></td></tr><tr><td><strong>Resampling Method</strong></td><td valign="top">Bilinear (L1B only)</td></tr><tr><td><strong>Bit Depth</strong></td><td valign="top">16-bit</td></tr><tr><td><strong>Map Projection</strong></td><td valign="top"><p>L1A VIRI &#x26; LIRI: EPSG 4326 (RPCs included in metadata)</p><p>L1B: Universal Transverse Mercator (UTM)</p></td></tr><tr><td><strong>No Data Value</strong></td><td valign="top">0</td></tr><tr><td><strong>Radiometric Rescaling</strong></td><td valign="top">Per-band gain and offset for conversion from DN to radiance and at-sensor reflectance included in metadata</td></tr></tbody></table>

### Level-1 Assets

Each STAC item includes several assets representing the individual data and metadata files associated with the scene. Items from different collections contain a different set of assets, as defined below.

<details>

<summary>vz-viri-l1a</summary>

<table><thead><tr><th width="214">Asset</th><th width="392">Description</th><th data-type="number">Center Wavelength (nm)</th><th>File Type</th></tr></thead><tbody><tr><td>BLUE</td><td>Blue band digital number (DN) values</td><td>490.5</td><td>COG</td></tr><tr><td>GREEN</td><td>Green band DNs</td><td>560.5</td><td>COG</td></tr><tr><td>RED</td><td>Red band DNs</td><td>665</td><td>COG</td></tr><tr><td>REDEDGE1</td><td>Red edge 1 band DNs</td><td>705.5</td><td>COG</td></tr><tr><td>REDEDGE2</td><td>Red edge 2 band DNs</td><td>740.5</td><td>COG</td></tr><tr><td>REDEDGE3</td><td>Red edge 3 band DNs</td><td>783</td><td>COG</td></tr><tr><td>NIR</td><td>NIR band DNs</td><td>842.5</td><td>COG</td></tr><tr><td>QUALITY_ASSURANCE</td><td>Radiometric saturation mask</td><td>null</td><td>COG</td></tr><tr><td>PREVIEW</td><td>Full-resolution RGB preview image</td><td>null</td><td>COG</td></tr><tr><td>THUMBNAIL</td><td>Low-resolution RGB thumbnail </td><td>null</td><td>PNG</td></tr><tr><td>METADATA</td><td>Ancillary metadata file</td><td>null</td><td>JSON</td></tr></tbody></table>

</details>

<details>

<summary>vz-liri-l1a</summary>

<table><thead><tr><th width="214">Asset</th><th width="392">Description</th><th data-type="number">Center Wavelength (µm)</th><th>File Type</th></tr></thead><tbody><tr><td>LWIR1</td><td>LWIR 1 band digital number (DN) values</td><td>10.895</td><td>COG</td></tr><tr><td>LWIR2</td><td>LWIR 2 band DNs</td><td>12.005</td><td>COG</td></tr><tr><td>QUALITY_ASSURANCE</td><td>Radiometric saturation mask</td><td>null</td><td>COG</td></tr><tr><td>PREVIEW_LWIR</td><td>Full-resolution LWIR preview image</td><td>null</td><td>COG</td></tr><tr><td>THUMBNAIL</td><td>Low-resolution thumbnail </td><td>null</td><td>PNG</td></tr><tr><td>METADATA</td><td>Ancillary metadata file</td><td>null</td><td>JSON</td></tr></tbody></table>

</details>

<details>

<summary>vz-l1b</summary>

<table><thead><tr><th width="214">Asset</th><th width="392">Description</th><th>File Type</th></tr></thead><tbody><tr><td>BLUE</td><td>Blue band digital number (DN) values</td><td>COG</td></tr><tr><td>GREEN</td><td>Green band DNs</td><td>COG</td></tr><tr><td>NIR</td><td>NIR band DNs</td><td>COG</td></tr><tr><td>RED</td><td>Red band DNs</td><td>COG</td></tr><tr><td>REDEDGE1</td><td>Red edge 1 band DNs</td><td>COG</td></tr><tr><td>REDEDGE2</td><td>Red edge 2 band DNs</td><td>COG</td></tr><tr><td>REDEDGE3</td><td>Red edge 3 band DNs</td><td>COG</td></tr><tr><td>LWIR1</td><td>LWIR 1 band DNs</td><td>COG</td></tr><tr><td>LWIR2</td><td>LWIR 2 band DNs</td><td>COG</td></tr><tr><td>QUALITY_ASSURANCE</td><td>Radiometric saturation mask</td><td>COG</td></tr><tr><td>CLOUD_MASK</td><td>Mask indicating cloud, cloud shadow, and snow or ice</td><td>COG</td></tr><tr><td>PREVIEW</td><td>Full-resolution RGB preview image</td><td>COG</td></tr><tr><td>PREVIEW_LWIR</td><td>Full-resolution LWIR preview image</td><td>COG</td></tr><tr><td>THUMBNAIL</td><td>Low-resolution RGB thumbnail </td><td>PNG</td></tr><tr><td>METADATA</td><td>Ancillary metadata file</td><td>JSON</td></tr></tbody></table>

</details>

## Level-2 Imagery

The Level-2 product includes radiometric terrain corrections and conversion to surface reflectance (SR) and land surface temperature (LST).

<table data-header-hidden><thead><tr><th width="221">Item</th><th valign="top">Details</th></tr></thead><tbody><tr><td><strong>L2 Product Granule Size</strong></td><td valign="top">70 km x 70 km</td></tr><tr><td><strong>L2 Pixel Size</strong></td><td valign="top">30 m</td></tr><tr><td><strong>Map Projection</strong></td><td valign="top">UTM</td></tr><tr><td><strong>Bit Depth</strong></td><td valign="top">16-bit</td></tr><tr><td><strong>No Data Value</strong></td><td valign="top">0</td></tr><tr><td><strong>Scaling Factor</strong></td><td valign="top"><p>LST, LST uncertainty, BT: 0.01</p><p>SR, emissivity: 0.0001</p></td></tr></tbody></table>

### Level-2 Assets

Level-2 assets include per-band SR and LST COGs (and more).

<details>

<summary>vz-l2</summary>

<table><thead><tr><th width="214">Asset</th><th width="392">Description</th><th>File Type</th></tr></thead><tbody><tr><td>BLUE_SR</td><td>Blue band surface reflectance</td><td>COG</td></tr><tr><td>GREEN_SR</td><td>Green band surface reflectance</td><td>COG</td></tr><tr><td>NIR_SR</td><td>NIR band surface reflectance</td><td>COG</td></tr><tr><td>RED_SR</td><td>Red band surface reflectance</td><td>COG</td></tr><tr><td>REDEDGE1_SR</td><td>Red edge 1 band surface reflectance</td><td>COG</td></tr><tr><td>REDEDGE2_SR</td><td>Red edge 2 band surface reflectance</td><td>COG</td></tr><tr><td>REDEDGE3_SR</td><td>Red edge 3 band surface reflectance</td><td>COG</td></tr><tr><td>LWIR1_BT</td><td>LWIR 1 band brightness temperature</td><td>COG</td></tr><tr><td>LWIR2_BT</td><td>LWIR 2 band brightness temperature</td><td>COG</td></tr><tr><td>LWIR1_EMIS</td><td>LWIR 1 band emissivity</td><td>COG</td></tr><tr><td>LWIR2_EMIS</td><td>LWIR 2 band emissivity</td><td>COG</td></tr><tr><td>LST</td><td>Land surface temperature</td><td>COG</td></tr><tr><td>LST_UNCERTAINTY</td><td>Land surface temperature uncertainty</td><td>COG</td></tr><tr><td>QUALITY_ASSURANCE</td><td>Radiometric saturation mask</td><td>COG</td></tr><tr><td>CLOUD_MASK</td><td>Mask indicating cloud, cloud shadow, and snow or ice</td><td>COG</td></tr><tr><td>PREVIEW</td><td>Full-resolution RGB preview image</td><td>COG</td></tr><tr><td>PREVIEW_LST</td><td>Full-resolution LST preview image</td><td>COG</td></tr><tr><td>THUMBNAIL</td><td>Low-resolution RGB thumbnail </td><td>PNG</td></tr><tr><td>THUMBNAIL_LST</td><td>Low-resolution LST thumbnail</td><td>PNG</td></tr><tr><td>METADATA</td><td>Ancillary metadata file</td><td>JSON</td></tr></tbody></table>

</details>
