Canevas – Tours Métropole Val de Loire
Description
**The topographic canvas is a set of topographical support points of high precision used as a reference to surveyors, topographers for field surveys.**
It makes it possible to meet the obligation to link all topographic operations to the legal reference system **RGF93**.
These points are materialised in the field, calculated in XY coordinates (**projection CC47**) and Z (**NGF-IGN69**), identified on MSDS and made available to all.
It covers the entire City of Tours. Some points can also be found in the communes of Saint-Cyr-sur-Loire, Saint-Pierre-des-Corps, La Riche, Joué-lès-Tours and Chambray-lès-Tours.
It consists of 25 pairs of primary points (ex: P15001) calculated by GPS in post-processing, and 919 secondary points (e.g. S15051) calculated by traditional method.
HOW TO RECOGNISE A POINT IN THE CANVAS?
The landmarks are most often materialised by a survey nail and a CAT-engraved washer sealed at the edge of sidewalks and by terminals in non-urbanised areas.
Resources
| Name |
Format |
Description |
Link |
|
8 |
|
https://www.data.gouv.fr/api/1/datasets/r/9d0a4b07-2f4b-4e4e-9fba-a2226e5d82af |
|
57 |
|
https://www.data.gouv.fr/api/1/datasets/r/1daef2c4-ed3a-42e1-9f82-4cd8135829ab |
|
23 |
|
https://www.data.gouv.fr/api/1/datasets/r/b66338a5-04ef-435c-aba1-972903177862 |
|
23 |
|
https://www.data.gouv.fr/api/1/datasets/r/a9b53dea-f854-4f95-b04b-6c59c8033aed |
Tags
- reference
- topographie
- referenciels
- sig
- canevas
- geometre
- coordonnee
- gps
- altimetrie