The City of Garland Geodetic Control Network (GCN) was established in 1990, followed by two adjustments. The first in 1996 corrected gross vertical errors and some horizontal data. The second adjustment, in June of 2002, tightened the data with the aid of NGS’ OPUS service. A summary of this adjustment is included below. The GCN is on the same datum as the Texas Department of Transportation (TxDOT) and can be used in conjunction with any TxDOT work.
While it is an optimal condition that the network data remain static, occasional adjustments may be necessary. Therefore, the user of the data must ensure that they have the latest values for any monument by checking with the City Surveyor. Additional monuments, including replacement monuments, are often set at various locations around the City. These points will be added to the network in the future.
The City of Garland makes no warranties, expressed or implied, as to the accuracy, correctness or precision of the GCN and it is the user’s responsibility to verify the accuracy of any data used. More Information.