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Benchmarking


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Mensagem Post: #1 a sexta 22 mai 2015, 03:45 

Benchmarking

Benchmark Hunting

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Using your GPS unit and/or written directions provided by NGS, which are available for review by the public, you can seek out NGS survey markers and other items that have been marked in the USA.
At the top of peaks or in a village square, you probably walk by at least one every day.

What is a benchmark? Imagem
A benchmark is a point whose position is known to a high degree of accuracy and is normally marked in some way. The marker is often a metal disk made for this purpose, but it can also be a church spire, a radio tower, a mark chiseled into stone, or a metal rod driven into the ground. Over two centuries or so, many other objects of greater or lesser permanence have been used. Benchmarks can be found at various locations all over the United States. They are used by land surveyors, builders and engineers, map makers, and other professionals who need an accurate answer to the question, "Where?" Many of these markers are part of the geodetic control network (technically known as the National Spatial Reference System, or NSRS) created and maintained by NOAA's National Geodetic Survey (NGS).

For the Beginner
The first step in any benchmark hunt is to choose some benchmarks to search for and get their datasheets. Do not set out with coordinates only; you must have the verbal to-reach description in the datasheet with you when you go. A good first step is to search around your own Zip Code using the search window at the top right corner of this FAQ page. For your very first trip, select some benchmarks that have recently been found so that you will be sure to see one in person on your first trip. The easiest to find are the ones that have been found by someone else using Geocaching.com and have uploaded pictures showing the mark's location. If none near you have been found by people using Geocaching.com, then choose some that have recovery reports from the last 10 years, since the probability is greater that they are still there, and findable. You should select some that are location-scaled and some that are location-adjusted so that you see what that difference means in the field.

The Hunting Process
When you arrive at the area of a benchmark's location but before you get out of your car, read the datasheet carefully. The first thing to note is whether the mark is location-adjusted or location-scaled. Next, read all the benchmark's recovery notes from the most recent to the oldest. In each recovery note, the most important item of information is the distance and direction of the landmark that is the the shortest distance from the station. Start with the closest landmark of all the recovery notes and see if you can find it. The most accurate instrument you have is your tape measure, not your GPSr, so use the tape measure first. If the mark can't easily be found, continue with the next closest landmark and measure from it to an intersection area with the distance you measured from the first landmark. If you don't see the mark yet, probe the ground in the area with a probe, (benchmarks often get buried) searching for the disk plus its monumentation. If you haven't yet found the mark, read older recovery notes again to try to get more information, since many recovery reports don't bother repeating older recovery information that's still good.

:arrow: Saiba mais aqui: http://www.geocaching.com/mark/

It's not always the find that brings the smiley... Imagem
It's not about the number you've found.
It's about the fun you had along the way.

The only numbers that matter are the friends you make!
It's all about the journey, the challenge, and enjoying the outdoors!

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Registado: segunda 22 ago 2011, 21:09

Mensagem Post: #2 a sexta 22 mai 2015, 23:17 

Re: Benchmarking

Existe alguma em portugal ?
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Geopt Lackey
Geopt Lackey

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Registado: terça 27 abr 2010, 13:57

Mensagem Post: #3 a sexta 22 mai 2015, 23:40 

Re: Benchmarking

Acho que isto em particular é exclusivo do Amaricanos mas por cá tb encontramos discos metálicos desse género. Conheço dois ou três, que encontrei por acaso.
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Registado: terça 18 fev 2014, 02:13

Localização: @ Sea

Mensagem Post: #4 a sábado 23 mai 2015, 01:31 

Re: Benchmarking

C.T.T. Escreveu:Existe alguma em portugal ?

Podia jurar que já tinha visto uma coisa destas no centro geodésico.
ENVIADO DA ERICEIRA POR CTT EXPRESSO

A CASA DOS DOIS SANTOS | 101 DÁLMATAS | LULLABY | THE ESSENCE OF KONTRABAND
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Geopt Lackey
Geopt Lackey

Mensagens: 7057

Registado: terça 27 abr 2010, 13:57

Mensagem Post: #5 a sábado 23 mai 2015, 10:19 

Re: Benchmarking

Sim. No aeroporto tb há uma ou duas... e em alguns Vg´s tb se encontram.
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Registado: domingo 25 abr 2010, 01:07

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Mensagem Post: #6 a domingo 24 mai 2015, 00:05 

Re: Benchmarking

O 1º ponto da (multi-) Santuário da Senhora da Rocha indica um.
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Mensagem Post: #7 a segunda 25 mai 2015, 09:22 

Re: Benchmarking

Em Portugal existem "benchmarks" deste tipo, o que não existe é a possibilidade de os registar em Geocaching.com mas, é possível fazê-lo em Waymarking.com na categoria: Imagem ​Portugal Geodetic Points​


Outras categorias relacionadas com "benchmarks" que existem no Waymarking:

Imagem U.S. Benchmarks

Imagem ​Canadian Benchmarks​

Imagem ​Belgium Benchmarks​

Imagem ​German Benchmarks​

Imagem ​Dutch Benchmarks / RD meetpunten​

Imagem ​U.K. and Ireland Trigpoints​

Imagem ​Australian Trig Points​


Imagem ​Walt Disney World Benchmarks​

Imagem ​Disneyland/DCA Benchmarks​
It's not always the find that brings the smiley... Imagem
It's not about the number you've found.
It's about the fun you had along the way.

The only numbers that matter are the friends you make!
It's all about the journey, the challenge, and enjoying the outdoors!
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Geopt Proud Member
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Mensagens: 27354

Registado: domingo 25 abr 2010, 01:07

Localização: Lisboa

Mensagem Post: #8 a segunda 25 mai 2015, 11:24 

Re: Benchmarking

Ainda existem uns milhares de chapinhas em Portugal (Rede de Nivelamento Geométrico).
Pena não serem disponibilizadas as coordenadas em formato reconhecível...
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Geopt Proud Member
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Registado: domingo 25 abr 2010, 09:08

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Mensagem Post: #9 a segunda 25 mai 2015, 20:14 

Re: Benchmarking

Estão explicados os vários tipos de "US benchmarks" que existem, aqui: http://www.geopt.org/index.php/board/viewtopic.php?p=42414#p42414
It's not always the find that brings the smiley... Imagem
It's not about the number you've found.
It's about the fun you had along the way.

The only numbers that matter are the friends you make!
It's all about the journey, the challenge, and enjoying the outdoors!
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Geopt Lackey
Geopt Lackey

Mensagens: 7490

Registado: quinta 09 dez 2010, 13:38

Mensagem Post: #10 a segunda 25 mai 2015, 21:59 

Re: Benchmarking

jasafara Escreveu:Pena não serem disponibilizadas as coordenadas em formato reconhecível...

O formato é bem reconhecível: Coordenadas Rectangulares Datum 73
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