Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 204
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Severity: Notice
Message: Trying to access array offset on value of type null
Filename: controllers/Technology.php
Line Number: 213
Backtrace:
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 213
Function: _error_handler
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 167
Function: fetch_sub_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 41
Function: fetch_menu
File: /home/ndtinstr/public_html/application/controllers/Technology.php
Line: 20
Function: index
File: /home/ndtinstr/public_html/index.php
Line: 315
Function: require_once
Particular magnetic properties play an important role in detecting ferromagnetic objects in the ground. Magnetic field measurement makes use of the fact that foreign materials in the ground have a different effect on the Earth's magnetic field. These fluctuations in the Earth's magnetic field are measured by a magnetometer. This branch of science is also referred to as geomagnetics. Local deviations in the magnetic field on the Earth's surface indicate ferromagnetic materials in the ground. In this way, geomagnetics can be used to detect various objects such as contaminated sites (e.g., unexploded bombs) or archeological sites.
