Geodetic reference systems stem from the need to provide a consistent and integrated reference surface for data analysis. Applications including surveying, mapping, navigation, remote sensing and mineral exploration all require accurate geodetic reference systems to spatially locate places or similar objects.
At the national level, Natural Resources Canada (NRCan) maintains the Canadian Spatial Reference System (CSRS), through the use of the North American Datum of 1983 (NAD83CSRS), which is the adopted standard here in Canada.
The Canadian Geodetic Survey (CGS), a branch of NRCan recently announced they are releasing a new version of NAD83(CSRS) (version 7.0) which will:
- be compatible with all previous versions of NAD83(CSRS);
- use the same 2010.0 coordinate reference epoch as NAD83(CSRS) v6;
- provides a more accurate realization of NAD83(CSRS) for both coordinates and velocities of CACS and CBN stations;
- includes a new velocity grid for crustal motion in 3D which is implemented in CSRS-PPP and TRX.
The coordinate differences with NAD83(CSRS) v6 at epoch 2010.0 are generally less than 1cm while the velocity differences are of the order of 0.5-1 mm/yr. The transformation has been implemented in all NRCan online geospatial tools including CSRS-PPP, TRX, and GPS-H.
Along with the new realization of NAD83(CSRS), CGS is releasing a new velocity grid which accounts for crustal motion in 3D. The new grid is implemented in the CGS tools CSRS-PPP and TRX for epoch transformations and is made available for scientific purposes such as relative sea level rise estimation.
The new velocity grid incorporates the improved NAD83(CSRS) v7 velocity field and includes continuous and high accuracy campaign GNSS data in Canada, Greenland, and surrounding areas of the USA, as well as new data processing and modeling techniques. These contribute to an improved representation of crustal motion.
What will be the impact on users?
- More accurate propagation of coordinates between epochs.
Recommended Geomatics Related Books:
Share this entry
Canadian GIS Education Programs
Contribute Canadian GIS Information, Education Program, Open Data or any other Canadian Geospatial related Info