Hello,
What types of survey marks can be added, please?
Using the (Victorian) Survey Marks Enquiry Service map at: https://maps.land.vic.gov.au/lassi/SmesUI.jsp, I’ve added a couple of survey Permanment Marks (PM xx) near my home that I’ve located on the ground; these being buried with a steel cover.
Thanks, John
Not knowing about the subject in Australia, I assume you are talking about:
msn_made=survey_point
These are quite important elements for the National Geographic Entities and for civil engineering. In the link shared above you can check the types of survey_point that exist, their shapes, materials, etc. and how to map them correctly.
You must keep in mind to use the highest possible precision in the coordinates, although OSM allows entering up to 7 decimals, the survey_point generally have above 10-12 decimals since they are elements whose position and elevation were taken with precision tools. Its importance lies in the type of survey_point and its purpose, from simple placeholders for building civil infrastructure to precision elements for measuring the displacement of tectonic layers, but mainly It provides high-precision terrain information and is essential for generating products in cartography, geodesy, topography, geography, and more.
What I mainly do is obtain an Excel from my national mapping entity where the exact positioning data of these survey_points are located.
I was reviewing Survey Marks Enquiry Service and they have excellent documentation about the types of survey_point they manage. In particular, you can consult:
https://www.land.vic.gov.au/__data/assets/word_doc/0034/512989/smes-user-guide-edition-1.docx
to get an idea of the topic. License compatibility with OSM remains to be investigated. However, if you are taking first-hand information, there should be no problems, you simply need to correctly identify the survey_points to add them correctly, Of course, information about the correct position of these elements will be lost, since its usefulness derives from the millimetric precision of its position and elevation.
A small example of the man_mad=survey_point in my region.
And in Australia
Finally, it is important to say that most Cartographic Entities in charge of these survey_point have a resume or CV for each of them, there you can find the type of survey_point, the material, its condition, year of construction or installation, a small location diagram and much more information.
Aside from the wiki documentation which is very helpful, I would like to share a basic (most common) key=value template for these elements.
name=*
ref=*
operator=*
description=*
survey_point:structure=beacon/block/pillar/pole/bracket/plaque/medallion/pin/indented_pin/cut/magnet(location=underground)
survey_point:purpose=horizontal/vertical/both
survey_point:datum_aligned=yes/no
source=*Not a list of what can be added, more a list of what I’ve added:
- Survey marks that are tourist attractions.
- Survey marks that define state/territory borders.
- Survey marks I can see in the aerial imagery, so I can check the imagery offset. You can see the downside of survey points for future checks; someone can just come along later and drag the node to the middle of the street.
Hello Felipe and Andrew,
Thank you for the replies, yes, I did mean “[msn_made=survey_point]” but forgot to include that. I’ve just added the points using the smartphone GPS for location after checking the SMES website for such marks near me.
So, I haven’t added the elevation etc. details.
John