Patents issued and pending
© 2024 Urban Sky. All Rights Reserved. Urban Sky, 4800 Race St. Denver, CO 80216
Status: Active
Authors: Mark Robertson
Change Log:
The Urban Sky microballoon is a small lighter-than-air balloon system capable of carrying a variety of payload systems to the stratosphere or upper atmosphere.
<aside> 💡 The metadata and sensor model are shared between all current Urban Sky L1B products, and collectively describe how 3D world points get mapped into the sensor coordinates for accessing pixel values from an L1B image.
</aside>
Each metadata file is a two-line CSV file, with one line for column labels and the other line for actual values. Header lines for all CSV files are identical. The included metadata include:
| Name | Description |
|---|---|
| Time | Image-capture time stamp; string formatted per RFC 3339 |
| Latitude | Latitude of the sensor; degrees |
| Longitude | Longitude of the sensor; degrees |
| Altitude | Altitude of the sensor; MSL meters |
| Pitch | Pitch of the sensor; degrees |
| Roll | Roll of the sensor; degrees |
| Heading | Heading of the sensor; degrees. Due north is 0 degrees, with increasing values corresponding to counter-clockwise such that due west is 90 degrees. |
| FocalLengthMeters | Focal length of the optics; meters. |
| PixelSizeMetersX | Size of a single pixel in the x dimension; meters. |
| PixelSizeMetersY | Size of a single pixel in the y dimension; meters. |
| DistortionK1 | Optical geometric distortion term applied to $r^2$ |
| DistortionK2 | Optical geometric distortion term applied to $r^4$ |
For customer convenience, we also provide a single CSV file with the metadata for all images combined. The main difference is an additional column:
| Name | Description |
|---|---|
| Name | Image filename to which this CSV line corresponds |