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rogbarn

Types of benchmarks

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I have downloaded several groups of benchmarks from the search for several differnt locations, including 5 different states. There is a total of 1,881 records. I summarized them by type to see what I could see. I found 48 different types. I further summerized these 48 types as follows:

 

disk - has the word "disk" in the type

13 types; 1,259 records or 67%

most common - survey disk

bench mark disk

traverse station disk

 

small markers - other markers but not disks

11 types; 158 records or 8.4 %

most common - metal rod

bolt

nail

 

landmarks - large structures that don't have a specific marker, just used in surveying

21 types; 125 records or 6.6 %

most common - church spire

tank

stack

 

unknown - aka Not Listed and a couple of other minor types

3 types; 339 records or 18.0 %

 

Note that this is not a scientific analysis since it is only examining less than 1,900 records out of a database of 735,000 records (about .03 % sample). Also, I had to use some judgement in how I catagorized some types. But I thought some might find it interesting.

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I just did a similar analysis of the benchmarks I had downloaded. Mine are in Texas, Indiana, and Ohio.

 

I have 3495 records with 54 types:

 

disk - has the word "disk" in the type

13 types; 2829 records or 81%

most common - bench mark disk (1657)

Triangulation disk (398)

survey sisk (396)

 

small markers - other markers but not disks

13 types; 353 records or 10%

most common - metal rod (245)

chiseled square (31)

bolt (25)

 

landmarks - large structures that don't have a specific marker, just used in surveying

27 types; 267 records or 8%

most common - elevated tank (124)

tank (22)

tower (22)

 

unknown - aka Not Listed 1 type; 46 records or 1%

 

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