## Overview

Bluesky provides digital surface models (DSM) and digital terrain models (DTM) generated from [Bluesky Aerial](https://docs.up42.com/data/bluesky-aerial) imagery over the UK.

- [Measurement and modeling](https://docs.up42.com/data/use-cases#measurement-modeling)

A BlueSky DSM of Bristol (UK)

## Data products

- DSM 25 cm [Order now ](https://docs.up42.com/data/order-form?collectionName=Bluesky%20Elevation\&dataProductTitle=DSM%2025%20cm)

  A non-integrated data product.

- DSM 2 m [Order now ](https://docs.up42.com/data/order-form?collectionName=Bluesky%20Elevation\&dataProductTitle=DSM%202%20m)

  A non-integrated data product.

- DTM 5 m [Order now ](https://docs.up42.com/data/order-form?collectionName=Bluesky%20Elevation\&dataProductTitle=DTM%205%20m)

  A non-integrated data product.

## Specifications

### General

| Specification   | Description                        |
| --------------- | ---------------------------------- |
| Provider        | Bluesky                            |
| Collection type | Catalog from 1,800 credits per km2 |
| Product type    | Elevation                          |
| System type     | Aerial                             |

### Data

| Specification                                               | Description                                                 |
| ----------------------------------------------------------- | ----------------------------------------------------------- |
| [Resolution](https://docs.up42.com/data/optical-resolution) | Product-dependent: • 25 cm • 2 m • 5 m                      |
| Data source                                                 | [Bluesky Aerial](https://docs.up42.com/data/bluesky-aerial) |

### Geographic reference

| Specification                                                 | Description                                                 |
| ------------------------------------------------------------- | ----------------------------------------------------------- |
| [Coordinate reference system](https://docs.up42.com/data/utm) | British National Grid                                       |
| [Positional accuracy](https://docs.up42.com/data/accuracy)    | Horizontal: 1 m RMSE absolute Vertical: 1.5 m RMSE absolute |

## Conditions

| Specification                                                    | Description                                                                                        |
| ---------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
| [Limitations](https://docs.up42.com/data/catalog-conditions)     | Input: [AOI](https://docs.up42.com/data/types) Availability: From 2022 Output: AOI-clipped imagery |
| [Minimum charge](https://docs.up42.com/data/catalog-min-charges) | Varies based on chosen data product and resolution                                                 |

## Geographic coverage

The geographic coverage is over the UK.