A survey marker in a brick wall.If you remove the plug in the center of the disc, there is a threaded hole where you can screw in a special "adapter" with a defined length that holds an prism.This way you can establish a horizontal control point in a vertical surface.The advantage of these is that they won't be destroyed or paved over if the road is repaved.But on the other hand there might be some people who wouldn't be too happy if a surveyor drills a hole in the face of their building to affix such a marker. ;-)This is from my hometown, where there aren't many of these. But here in Hanover there are quite many (but i guess I'm one of the very few people who will notice them when walking along. ;-)The inscription reads: "Messpunkt" meaning "measuring point".If the exact elevation is known these points might also be used as benchmarks for vertical control.
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Survey Photos by Tag or CategoryEarth's Largest Survey Photos Collection
Since 2007, Land Surveyors around the world have shared their best Surveying Photos from the field. Inside this collection you can transport yourself to virtually any location on Earth and see how Land Surveyors work, types of equipment being used and environmental challenges associates with being a land surveyor in that location.
Location Based Chapter Hubs also have photos specific to the locations they represent. You can use our Surveyor Apps for quick sharing of your photos from the field.
Note: Members who have uploaded their photos of surveying to this collection can also move their photos to location based hubs. To see how, follow this tutorial.
Thoughts
We have these kind of markers in Texas(USA) as well...