To improve parcel fabric quality and integrity, spatial improvements are used to update both the relative and absolute positioning of survey parcels and to improve the accuracy of the parcel representations shown in ParcelMap BC.

Spatial improvements can range from simple transformations that only improve absolute positioning (not relative accuracy), through to rigorous least-squares adjustments that involve a full survey network adjustment of both relative and absolute position.

The ParcelMap BC Operations team targets delivery of spatial improvements for 1-2 Areas of Interest each month. A list of Completed Spatial Improvement Areas outlines those areas that have been updated in ParcelMap BC using spatial improvement processes. For participating stakeholders, positional updates resulting from spatial improvements are available as a Change Vectors data product via the ParcelMap Direct Service.

To provide transparency and insight into spatial improvement planning, the ParcelMap BC Spatial Improvement Assessment app delivers a visualization of the analysis used by the ParcelMap BC Operations team to plan and prioritize spatial improvement work across the province.

Regularly updated, the app provides a view into the assessed accuracy of the parcel fabric to broadly identify areas across the province with significant misalignment to control. The app also highlights areas where the assessment indicates an area's readiness and, if appropriate, as a candidate for improvement. Using this information, Areas of Interest are prioritized to address those areas of the parcel fabric most in need of improvement. In well-aligned areas, where an adjustment would not provide a meaningful improvement (e.g. shifting parcels by a few centimetres), spatial improvements are not generally applied to the parcel fabric to minimize alignment issues with third party data.

Learn more information about the data, as well as access Help resources for using the app.

The various readiness criteria used to determine if--and what type of--spatial improvements could be applied in an area include:

  • Ratio of Survey (high quality data - example at Survey Plan Datasets) versus Inverse (unknown quality data - geometry from source polygons) parcel dimensions;
  • Number and spread of active control points;
  • Alignment of parcels to control points (i.e. bearing and distance of adjustment vectors between parcel points to known control points);
  • Connectivity in the parcel fabric of parcels to control points and between islands of parcels

Contact myLTSA Tech Support if you have additional questions about spatial improvements in ParcelMap BC.