User's Manual

GPR4 Utility Scanner
–
User Manual
D
-
000002
-
000023
Earth Science Systems, LLC
October
9
,
2019
Copyright © 2019 ESS, LLC. All rights reserved. Page 25 of 27
7.8 Specifications
• 750 MHz bi-static radar antenna
• 350 MHz bi-static radar antenna
• Electric field sensor for detecting power lines or tracer signals
• Magnetic field sensor for detecting power lines or tracer signals
• Dimensions: 25W x 30L x 29.9H inches (63.5 x 76.2 x 75 cm) including wheels and skid plate
• Shipping container dimensions: 36 x 28 x 20 inches (91.4 x 71.1 x 50.8 cm`)
• Weight: 57.6 lbs
• WiFi connection between sensor and tablet
• Removable tablet computer allows data analysis from vehicle or office
• Durable construction with IP65 ingress protection
• Positioning systems includes odometer, GPS, and optional inertial measurements.
• Optically coupled odometer eliminates cables and interference to magnetic sensors
• Short handle for surveys within arm’s reach
• Long handle for floor surveys rotates and locks into different positions
• Rechargeable LiFePO4 battery provides about 8 hours of use. Includes second battery for all
day use.
• Shipping case contains chargers for two batteries and the tablet computer
• 3D imaging and mapping software
7.9 Data File Format
Data recorded by the active ranging system are stored using the HDF5 file format. HDF5
allows storage of large datasets in complex data structures. In addition to the data stored in an
HDF5 file, the files provide all of the data type and format information needed for reading the
data. A helpful utility for quickly browsing HDF5 file is the HDFView utility which is freely
available from the HDF5 Group (https://www.hdfgroup.org/downloads/index.html). The HDF5
Group provides free software interfaces for HDF5 in most popular computer languages including
Fortran, C, Java, Python, and Matlab. Figure A3 is a screenshot from HDFView showing the
contents of an H5 file recorded by the sonic logging system. On the left is a tree structure that
lists the datasets in the file. The JobInformation dataset contains information about the jobsite.
There is a folder for each data server (e.g., gpr4, odometer, gps, etc.), and each folder contains
configuration information and data. As shown below, the detailed format of each dataset is
included in the file. This self-describing feature of HDF5 files along with the open software
interfaces allows the data to be easily read by user-developed software.