--- title: How to Field Check R3 Pro LiDAR data without a ROCK Desktop license description: Quick Field Check of Data --- [Skip to content](https://learn.rockrobotic.com/how-to-field-check-lidar-data-without-a-rock-desktop-license-0#main-content) English Show submenu for translations ![ROCK-robotic-community-logo.png\]](https://learn.rockrobotic.com/hs-fs/hubfs/ROCK-robotic-community-logo.png?width=250&height=50&name=ROCK-robotic-community-logo.png) - [ROCK Customer Support](https://www.rockrobotic.com/support/) Open main navigation Close main navigation - [ROCK Customer Support](https://www.rockrobotic.com/support/) - English Show submenu for translations - [www.rockrobotic.com](https://www.rockrobotic.com/) [www.rockrobotic.com](https://www.rockrobotic.com/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [ROCK Knowledgebase](https://learn.rockrobotic.com/?hsLang=en) 2. [ROCK R3 Pro](https://learn.rockrobotic.com/rock-r3-pro?hsLang=en) 3. [Data collection](https://learn.rockrobotic.com/rock-r3-pro?hsLang=en#data-collection) December 10, 2025 # How to Field Check R3 Pro LiDAR data without a ROCK Desktop license ## When you need to verify a dataset in the field, without a ROCK Desktop license, without your dongle, or without time to process, you can still perform a fast, effective QC by reviewing the raw folder structure generated by your R3 Pro (or R3) LiDAR unit. #### **Overview** The goal of this workflow is to confirm that: - All expected photos were captured - The LiDAR file exists and is an appropriate size - IMU and GNSS data were recorded consistently - No immediate signs of data corruption are present   --- #### **1. Confirm Folder Structure** After copying data from the USB drive, verify the dataset contains: - CAM1 - Lidar1 - POS - device\_info.json If any of these are missing, perform further investigation before leaving the field. --- #### **2. Check Photo Count (CAM1 Folder)** 1. Open the CAM1 folder. 2. Review the total item count. 3. Identify the **first** image (should end in \_1.jpg). 4. Scroll to the **last** image—confirm numbering is sequential. **You should find:** - Total image count (minus temp files) matches final image number - No missing frames or numbering gaps **Optional check:** Open the .tmp file in a text editor (e.g., Notepad++). - Scroll to the bottom - Final line number should match the final image number --- #### **3. Check the LiDAR File (Lidar1 Folder)** For **R3 / R3 Pro**: - Expect a **single .mlr file** - File size should be **multiple gigabytes** - Longer flights = larger files A very small .mlr file (e.g., 1–2 GB on a long flight) may indicate incomplete transfer or a capture issue. --- #### **4. Check GNSS & IMU Files (POS Folder)** For **R3 / R3 Pro**, you should see: - ...imu.imr - ...imu.ins - ...gnss.gps **Verify:** - All three files are **roughly the same size** - Minor variance is normal - Major variance (e.g., GNSS file half the size of IMU files) suggests GNSS signal loss or data corruption --- #### **5. When to Re-Fly or Investigate Further** Re-fly or investigate if you notice: - Missing/partial photo sequences - Very small mlr file - POS files with major size mismatches - Folder structure missing key components - Any unexpected file size anomalies --- #### **Example Quick-Check Workflow (OL)** 1. Copy dataset from USB to laptop. 2. Verify folder structure is complete. 3. Count images and confirm numbering is sequential. 4. Verify LiDAR file exists and is multiple gigabytes. 5. Compare IMU/GNSS file sizes. 6. 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