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Survey Control

The Survey Control application is an interactive map that allows users to access specific information about Baltimore County Control points. The application allows users to search for Survey Control in Baltimore County through several different methods. Registered users are allowed to submit Recovery information about existing control for further review by Baltimore County Public Works.

New Visitors

Review the Survey Control User Guide for a tutorial on the application.

Upon first visit to the application, users will be directed to download a one-time, free Silverlight plug-in directly from Microsoft. Install the proper plugin if you are using an Apple MAC OS X and need to install Silverlight.

The application may load slowly upon first visit. Loading time will decrease during subsequent visits.

System Requirements

  • Survey Control requires the Microsoft Silverlight plug-in. An install link is provided for first time users. Apple MAC OS X users will need to install Silverlight.
  • Pop-up blockers must be disabled for Survey Control to function properly. Refer to your browser's support on how to check and update this feature.
  • High-speed internet connections are recommended for best results.
  • Survey Control has been tested using Internet Explorer 8.0 and Mozilla Firefox 3.5.3.

User Terms and Conditions Summary

Baltimore County adopted the Maryland Coordinate System, North America Datum of 1983 (1991) and the North America Datum of 1988 as its standard horizontal and vertical datum starting July 1, 1999. Prior to this date Baltimore County Metropolitan District grid system (horizontal) and Baltimore County Datum (vertical) were used for thousand of plats and surveys throughout Baltimore County.

Both systems of survey controls are being made available from this site to assist users with all surveys performed in Baltimore County. Users of this data must check the County code, policy and with appropriate agencies to verify the correct datum(s) are to be used on current and future projects requiring Baltimore County approvals.

New users should review the User Terms and Conditions. Current users can login or update registration if their information has changed.

More Information

For more information email surveycontrol@baltimorecountymd.gov or call 410-887-3540.

Revised November 20, 2014

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