International Land Measurement Standards (ILMS)

Appendix B - Topographic Survey Detail Accuracy Banding Table

Appendix B - Topographic Survey Detail Accuracy Banding Table

Band

2 sigma (X,Y)

Accuracy hard detail (Z)

Example survey types/uses

Approximate legacy plot scale output required to achieve accuracy band

Min size of feature shown true to scale (not symbolised)

E

+/- 50mm

+/- 10mm

Scanned surveys, Measured building surveys, topographic surveys, boundary dispute surveys, area registration

1:100

50mm

F

+/- 100mm

+/- 50 mm

Low accuracy measured building surveys, topographic surveys, high accuracy utility tracing,

1:200

100mm

G

+/- 200mm

+/- 50mm

Topographic surveys, aerial imagery, LIDAR surveys, low accuracy measured building surveys

1:500

200mm

H

+/- 500mm

+/- 125mm

Low accuracy topographic surveys, infrastructure surveys, aerial imagery, LIDAR surveys, satellite imagery, urban cadastre surveys and parcel demarcation

1:1000

500mm

I

+/- 1000mm

+/- 500mm

National mapping, general boundary mapping, asset mapping, aerial & satellite imagery, rural cadastral surveys and parcel demarcation

1:2500

1000mm

J

+/-2000mm

+/- 1000mm

National mapping, wide scale asset mapping, parcel identification (rural), UN GGIM Cadastre master level 1, Fit for Purpose level 1

1:5000

2000mm

K

+/- 4000mm

+/- 2000mm

National mapping, state land mapping, national parks & reservations, UN GGIM Cadastre master level 0, Fit for Purpose level 0

1:10 000

4000mm

Core Recommandation n° 8 - UN GGIM.

Core data should be captured based on datum WGS 84 or ETRS-89 in areas within its geographical scope, either using geographic or projected coordinates.

Absolute accuracy

Cadastral parcels should have in general an absolute accuracy of 1 metre or better in urban areas and of 2.5 metres or better in rural areas. In case of new surveys, it is recommended to use methods enabling absolute accuracy better than 50cm.