Headwall Nano HP

The Headwall Nano HP VNIR sensor requires in-field setup for each flight. These parameters include frame period/framerate, gain mode, exposure, and capture polygon.

Frame Period

The sensor's frame period is a measure of how fast each frame (row of pixels) should be captured. This value will directly correspond to flight speed, as we must plan for the sensor to capture frames at (or faster than) the rate at which the aircraft traverses those frames.

The Headwall Nano HP has a maximum framerate of ~250 Hz, which equates to a 4ms frame period. For the purpose of data integrity, Headwall does not recommend operating a frame period faster than 4.5ms.

Exposure & Gain Mode

Exposure, or more appropriately Exposure Time, is a measure of how long we expose the sensor array to light for each captured frame. This value will determine how "bright" our image is by controlling how much incoming energy we allow to the sensor array. The goal for maximizing data quality should be to set exposure to the maximum saturation level possible without "clipping" any incoming spectral information.

Capture Polygon

Users must upload a polygon file to the sensor that act as lateral bounds for data capture. Data will begin collecting when GOBI is inside the GPS polygon AND has exceeded the data triggering threshold (20m by default).

Please see your aircraft's UAS Quick Start guide in our GRYFN Operations Wiki for building a GPS Polygon.