Transcribed values are checked manually on a sampling basis to identify errors. As well external sources of information have been used to validate the values wherever possible.
There is no independent quantification of the accuracy rate for the attribute values but it is believed to be very good.
The polygonal data does have some gaps between polygons (referred to as "slivers") that were created during the data assembly and loading. The vast majority of these were eliminated early on in the project but the remaining slivers require manual intervention to clean them up. These are being removed in conjunction with the maintenance of the data. The number of slivers in the data represent less than 0.1% of the objects in the data set.
Under the implementation of the automated land titling system (the LAND Project), Information Services Corporation has substantially completed the conversion of the paper based textual descriptions on the actual title document (metes and bounds parcels) to be fully integrated within the SURFACE layer of the Cadastral Product. The completeness of this conversion may be determined by viewing the SURFACE theme in the data set. Any parcel which has a non-null parcel number attribute may be considered as complete while any that has a null parcel number may or may not be subject to further subdivision by a metes and bounds description. (Further details on the LAND project may be found at www.isc.ca)
The MINERAL theme in the data set is not complete and may never be fully completed. Emphasis is being placed on private mineral ownership in currently active mineral producing areas of the province. The next priority is on mineral ownership in rural areas that are not currently active while mapping of mineral ownership in urban areas is of a much lower priority.