Abstract:A highaccuracy horizontal reference device is very important for verification of instrument of surveying and metering. At present the debugging of highaccuracy horizontal reference device is menmade,which wastes much time and with large error,therefore,it is necessary to make this equipment automation retrofits.
The uncertainty analysis image measurement system after upgrading was studied by the combination of evaluation methods using standard of class A and class B,the results show that the transformation accuracy can meet the requirements of metrological verification.