# Data Management

{% hint style="warning" %}
When GOBI is powered indoors, GRYFN recommends pointing a small fan at the main exhaust vents to help keep thermals in check. GOBI maintains good temperatures in flight with sufficient airflow across the chassis, but can become quite hot when sitting powered in stagnant air for extended periods of time.
{% endhint %}

## Data Storage

A 500GB internal mSata Solid State Drive (SSD) is installed in the chassis. This internal device collects and stores VNIR Hyperspectral, LiDAR, and GNSS data. A 256GB SD Card is installed in the optional RGB frame camera for storing RGB images.

## Offloading Data

### Via GRYFN Processing Tool

<table><thead><tr><th width="113">STEP</th><th>ACTION</th></tr></thead><tbody><tr><td>1</td><td>Connect to chassis via Ethernet or WiFi</td></tr><tr><td>2</td><td>Open GRYFN Processing Tool</td></tr><tr><td>3</td><td>Open the <strong>Bundle Data</strong> tab</td></tr><tr><td>4</td><td>Under <strong>Download from Sensor</strong> click <strong>Query Sensor</strong></td></tr><tr><td>5</td><td>After a few seconds your GOBI chassis will appear, click on it</td></tr><tr><td>6</td><td>Click <strong>Create GRAW</strong></td></tr><tr><td>7</td><td>All available missions will appear</td></tr><tr><td>8</td><td>Select the mission you wish to download</td></tr><tr><td>9</td><td>Choose a save path</td></tr></tbody></table>

### Via FTP Service

First, connect to the GRYFN GOBI chassis via Ethernet. Then, in your FTP application of choice (WinSCP, Filezilla, etc.), to access LiDAR data, VNIR Hyperspectral data, and system logs, use the following session settings:

| PARAMETER     | VALUE      |
| ------------- | ---------- |
| File Protocol | FTP        |
| Host Name     | 10.0.65.50 |
| Port Number   | 21         |
| User Name     | gryfn      |
| Password      | gryfn      |

Files can be found in the following directories:

<table data-full-width="true"><thead><tr><th>DATA TYPE</th><th>DIRECTORY</th><th>FILE TYPES</th></tr></thead><tbody><tr><td>GNSS</td><td>/data/{mission_name}/gnss</td><td><strong>.00#</strong><br>     • Raw data file (where # is the session file, new session is made per UTC hour)<br><strong>.json</strong><br>     • System configuration file</td></tr><tr><td>LiDAR</td><td>/data/{mission_name}</td><td><strong>.pcap</strong><br>     • Raw LiDAR data packets<br><strong>.json</strong><br>     • System configuration fiel</td></tr><tr><td>VNIR</td><td>/data/capturedData/captured/{dateTime}</td><td><p><strong>.hdr</strong><br>     • Hyperspectral data header file<br><strong>.bin</strong></p><p>     • Hyperspectral raw data file<br><strong>.txt</strong><br>     • Various frameIndex, settings, and other data files</p></td></tr><tr><td>System Log</td><td>/data/gryfn.log.{date}</td><td><strong>.log</strong></td></tr><tr><td>Frame Camera</td><td>Images are stored to the camera's SD Card</td><td><strong>.jpg</strong><br>     • Image files</td></tr></tbody></table>

### Data Confirmation

After the flight, or after data has been downloaded to your local device, check file counts and sizes against the nominal collection rates in the table below to ensure data has been captured properly.

<table data-full-width="true"><thead><tr><th width="157">SENSOR TYPE</th><th>FILE COUNT</th><th>FILE SIZE</th><th>NOTES</th></tr></thead><tbody><tr><td>GNSS-INS</td><td>1 file</td><td>~1.5MB per minute</td><td>A new file will be created if time rolls over the hour (clock time, not capture time).</td></tr><tr><td>LiDAR</td><td>1 per minute</td><td>~175MB per file</td><td>First &#x26; last file may be smaller<br>May be smaller if over low reflection object.</td></tr><tr><td>VNIR</td><td>Mission time (s) ÷ Frame Period value ≈ number of data cubes</td><td>VNIR data should capture several GB of data for even short flights</td><td>Check that frameindex, imu_gps, settings files all exist.</td></tr><tr><td>RGB</td><td>Image every 2s</td><td>~30 - 70MB per image</td><td>Check event log vs number of images</td></tr></tbody></table>

## Clearing Storage

### GNSS-INS, LiDAR, and VNIR

<table><thead><tr><th width="113">STEP</th><th>ACTION</th></tr></thead><tbody><tr><td>1</td><td>Connect to chassis via Ethernet or WiFi</td></tr><tr><td>2</td><td>Navigate to GOBI WebUI</td></tr><tr><td>3</td><td>Clear Mission</td></tr><tr><td>4</td><td>Alternatively, delete missions/files individually via FTP software</td></tr></tbody></table>

{% hint style="warning" %}
Clear Mission button will delete GNSS data, LiDAR data, and VNIR data. RGB data must be deleted from the SD card separately. Only remove data *inside* the DCIM folder.
{% endhint %}