Jump to content

68-eldo

Members
  • Posts

    355
  • Joined

  • Last visited

Posts posted by 68-eldo

  1. Height of light above station - The distance from the survey mark to the center of the light (which is the object they used to sight upon). Lights are used for long distances. Other targets cannot be seen over great distance.

     

    The height is needed for the trig computations. Th farther above sea level you go, the greater the distance between points and thus you have to know the various elevations differences between the surveyed points to determine accurate position.

     

    I found that sometimes (at least in this area) the term is used without actual lights. This type of station is common here.

    2915b063-351b-4372-9a78-aef0fcebd345.jpg

     

    In the 1969 recovery of Ewa Church Reset the term "height of the light above the station" is used. Maybe it's just a local thing.

     

    If the lights are temporary why would the height be listed in the data sheet? Wouldn't it depend on the preferences of the survey party and what they had available at the time?

  2. I found a website in my paperwork I got with this benchmark. Thought I would pass it along.

    http://geositu.com/

     

    Very nice replicas but not accurate. I got one for Longs Peak and one for Diamond Head.

     

    Here’s the pictures for the Diamond Head replica and the real thing.

    benchmark.jpg

    3c15a503-d42f-4857-b680-c55a3047d7b8.jpg

     

    My wife asked me where I was going to put it. She wasn’t happy when I suggested the middle of the coffee table.

  3. Kewaneh,

     

    Your posts are excellent, well thought out and helpful. The part about “Others may want to forget…” I missed that it was meant in jest and I apologize for that. I have fallen victim of that myself and find I need to use those blasted emoticons or smileys when I attempt humor. I did not think that you were brushing off the OP or disrespectful in any way.

     

    I understand the point that the NGS web site was written for professionals by professionals. But they did open it up to the general public to update the database and that’s where the trouble begins.

     

    I just retired after 38 years working with gun and missile fire control and weapons systems, search radar and electronic countermeasures aboard Navy ships and submarines. I tend to think of myself as above average technologically speaking. But I was wrong about the meaning of the question. I feel I was partly led astray by Google (and others) and their aerial photos they label as satellite. I know I looked at a couple of benchmarks in Google to see how well the area around the mark looked.

     

    My underlining concern here is the integrity of the NGS database. Now there are some stations out there that are labeled as suitable for satellite observation that may not really be suitable. Some professional may spend time and money to go out to the station only to find out the database is wrong. I think answering this question correctly is just as important as the destroyed/not destroyed question that is being debated in other threads.

     

    Thank you for using your years of experience and knowledge to help us newbies.

  4. I have found Kewaneh to be a very informative and valuable contributor to this forum and fail to see any of his posts as disrespectful, having read the thread in question I can see how he could be frustrated by it.

     

    Agreed. If Kewaneh was frustrated by my post in that thread I apologize. I was also frustrated, not by Kewaneh.

  5. The fact that this question keeps coming up on this form indicates that the NGS web pages needs a little clarification. Especially since they take input from the general public.

     

    This topic was discussed a few months ago in the thread titled Suitable For Satellite Observation?

     

    You may find some additional info to help answer your question there. (Others of us may want to forget that thread.)

     

    - Kewaneh

     

    When a newbie ask questions on a forum I have more knowledge about I answer with respect and in a manner that will help the poster learn. Not everybody does that here and it detracts from the quality of this forum. No one is knowledgeable about everything.

  6. For example, take a look at the log for AB5651 (GPS 045) in Easton, MD. I've included area photos that each include the mark itself and a landmark referred to in the NGS datasheet or my log. In this case there are three: a big water tank, a skate park, and an industrial building. I used to point out the location of the mark with an arrow; now I use a box, which I think is a bit less obtrusive. Others set up some marker in the field so they don't have to edit their photos afterwards.

     

    -ArtMan-

     

    Suggestion: In the area photos label them as FROM the north or TO the north. Just "north view" could be confusing. Although once on site it would become clear.

  7.  

    I was thinking about using a golf rangefinder to use to mesure off with would that work? I hunt by my self so I have to be creative a tape mesure might be hard to use.

     

     

    I maybe wrong but I think the golf rangefinder uses the height of the pin (flag pole on the hole) to measure the distance. So unless you have a standard size pin I don't think it will work.

  8. What I find funny, is that there are caches out there that get more TB traffic than so-called TB Hotels (with or without limits). The Sands Of Waikiki has had 3 times as many TBs pass through than Honolulu International TB Resport & Spa, and currently has 5 TBs listed as opposed to none in the "Hotel".

     

    Everytime I've been to Hawaii the Sands gets a visit from me, for drop offs and pick ups. The cache is a very active one, and is a much better place to drop a TB. The Hotel is in an awful location, not really worth visiting, and not really any more accessible than the one on the beach.

     

    I've wondered about that. I don't know about other people but when I am on my way to or from an airport I don't have time to stop and look for a cache. Once checked in at my hotel then I can spend time hunting.

  9.  

    Eldo, I wish you had a photo of your plate; I would be very skeptical about that being the correct mark that you were looking for. If it was screwed onto wood, then it would not be reliable to use for a control mark due to the movement in the wood. I think that mark is either gone or is in a different location than you were looking.

     

    CallawayMT

     

    Yep, I agree it is a pretty flaky mark, but it was exactly where the description indicated and was stamped with the correct number. I am confident it is the mark.

     

    I would go back and get a better pencil rubbing but since I retired I don't have access any more.

     

    Pictures are not allowed if you don't have photographer's permit. If they find you have a camera phone they will take it to the forge shop and smash it with a trip hammer. That’s how serious they are.

  10. I am new to hunting benchmarks and found one that is a fairly tough one to get to. It is in an alpine wilderness area and refers to a tablet that references a station. If you would like to see the page itself it is HERE. For convienence I have cut and pasted the description:

     

    My 1st rookie question is what is a "tablet" and what would one look like?

    2nd rookie question: Is a reference mark a disk?

     

    Thanks for you patientce with the new guy!

     

    On this station TU1431 the tablet is a square brass plate attached to a wooden frame with wood screws. Maybe some areas called the disk a "tablet" but for this one it is not a standard disk.

     

    When you get there just look for anything man made set in stone.

  11. I just want to emphasize this point that BDT made:

     

    If you're confident of your finds, it is good to report them to the NGS site.

    Please be *very* confident of your finds before you report them. There are other threads going on in this forum right now about a benchmark that was reported found two times in the past few years, when in fact it was a *clearly marked* reference mark that was found, not the station itself. Another thread is discussing the idea of a volunteer benchmark hunting corps and how we would need to keep up our standards for accuracy in order to maintain the respect of the NGS.

     

    I personally know of two survey marks in a nearby city (Mountain View, Calif.) that have repeatedly been logged on Gc.com as found when in fact neither mark is no longer there. People are finding different benchmarks (sometimes even vastly different sizes and from different agencies) more or less nearby (a few dozen feet or so) and logging the original station as found. We don't want that kind of mistake relayed to a "GEOCAC" report filed with the NGS.

     

    Sorry for getting on a soapbox, but sometimes I want to tear my hair out when I see those logs! :rolleyes: Don't forget, the folks here on the Benchmark Hunting forum are happy to answer any questions you may have about a survey mark you've found, or about reporting it to the NGS.

     

    I hope you enjoy your new addiction. :P

     

    Patty

     

    Here are a couple of examples:

     

    TU1336 and

     

    TU1337.

     

    TU1337 is Diamond Head 2 set in 1969. All the pictures of the mark are of Diamond Head 2 reset 2002. Many of the pictures are of RM 3 and claim to be the mark.

     

    TU1336 was most likely destroyed but is not logged as such (NGS data base seems to be down at this moment so I can't check the latest logs).

     

    TU1456 continues to be logged after CGS reported it destroyed in 1967. (This one looks cool in Google maps satellite photo). Many of these cachers are just playing a game and would not bother to report to NGS. But it only takes a few to give GEOCAC a bad reputation.

     

    The devil is in the details.

  12.  

    GEOCAC has always reminded me of syrup of ipecac. I am attached to it, however, like you for the reporting to the NGS.

     

    As for those who haven't touched this topic yet, thoughts?

     

    Buckner

     

    Benchmark hunting and reporting to NGS using GEOCAC is open to everyone. What I am concerned about is that a significant percentage of the reports to NGS using GEOCAC will be of little value to them or the professionals that use the benchmarks. They will look at the GEOCAC name and see Power Squadron. My own experience with the reports from Power Squadron has been poor, and I see from the post in this forum I am not the only one that feels that way.

     

    If we go to a lot of effort to bring this group up to a higher level, then I think we should have a different name to log our reports with NGS. Something that the professionals will look at and think “There’s a report we can rely on”.

     

    Just my 2 cents.

     

    I am certainty interested is learning how to do a better job of finding and reporting benchmarks.

  13. Team Laxson -

     

    In some cases, an associated mark has its OWN PID. In those cases, you can log a find on these associated stations because they have their own PID. Nearby station WANAKA AZ MK is an example. It is an associated mark to WANAKA and both WANAKA and its associated station WANAKA Azimuth mark have their own PIDs so you can log them indepenedently. WANAKA also has 2 other associated marks, RM 1 and RM 2 but those don't have their own PID, so they would have to be part of a log of WANAKA or perhaps WANAKA AZ.

     

    What is the thinking behind giving an RM its own PID? Is this only because of the way it was moumented or is there another purpose?

     

    For example TU0629 has two RM within 100 feet and they both have their own PIDs TU0628 and TU0630

  14. To: 68-eldo:

     

    I believe we all would agree that "suitable for satellite observation" could be taken two ways. Actually, I'd never thought about this until you mentioned it, but then I slapped my head and said, "Wow. He's right!"

     

    In NGS terms, it refers to the ability of the GPS receiver to 'see' the satellites. However, you probably have seen the props used to make marks visible from the air. Often, it is a white paper arrow anchored to the ground, with the point exactly on the benchmark. These photos are taken by aircraft, flying over a specific project. However, I'm sure the modern satellites could "see" the marking, if somebody elected to zoom in.

     

    Here's a sample. Look at the left center edge of the picture. I drew a box around the cross marking station WELCOME in Holly Springs, North Carolina. The scale of this photo is 1:3333, known officially as "Urban High Resolution".

     

    Best regards,

    Paul

    Photo from TOPOZONE.

     

    OK, here is Deb Browns answer and my email to her:

     

    Hi Glen,...

     

    Good question. The satellite question refers to the signal ability not photographs.

     

    deb

     

    Glen Houlton wrote:

     

    > Mrs. Brown,

    >

    > My apologies if you have received this message a second time. I

    > received a bounce message the first time I sent this, so I am trying

    > again from a different email address. If you have already responded

    > please disregard this message.

    >

    > As a geocher looking for and reporting benchmarks I find this entry on

    > the reporting form.

    >

    > *Satellite Usage*

    >

    > Generally, a station is suitable for satellite observations if there

    > is a clear and unobstructed view of the sky from approximately 15

    > degrees above the horizon at the location of the station. Small

    > objects such as a light pole or small tree are excepted.

    >

    > Is this station suitable for satellite observations?

    >

    > _ Yes _ No _ Don't know

    >

    > My assumption was that it referred to the ability of a satellite to

    > photograph the benchmark (with appropriate markings to help locate the

    > mark). However there is a discussion in the benchmark hunting forum

    > about this. There they are talking about the quality of the GPS signal

    > at the station’s location.

    >

    > So my question is: is this entry on the form in reference to visual

    > observation by satellite or GPS reception from satellites? If it

    > refers to visual I can look up and see if there are any obstructions,

    > if it is signal quality I will need to mark them all as “I don’t know”.

    >

    > I want to make sure my reports are as accurate as possible.

    >

    > Thanks for your help.

    >

    > Glen Houlton

    >

     

    Thank you to PFF for at least seeing my point of view.

     

    While driving I noticed a large X in the road and waypointed the spot with my GPSer. This X is obviously used for identifying a location in aerial photos. Unfortunately the Google maps satellite photo quality is not good enough to see that one.

     

    But if you go to this photo you can clearly see the lines in the parking lot. These lines are not any larger than the ones on the X I waypointed. So logically I would assume that if you painted lines like this to mark the location of a benchmark you could see it in a satellite photo.

     

    Oh, wait, TV is not real so I guess this is impossible. Google must have Photo shopped this in. Or Google has access to better satellite photos that NGS.

  15. Kewaneh & Shark

    Much of it is based on experience and professional site interpretation, proper planning prior to the site visit (using sky plots and DOP charts), and the ability to know the strengths and weaknesses of the equipment to be used in order to achieve the desired results.

    So, I take it that your opinion is that unless we are a professional surveyor like yourself, we should always answer the NGS satellite suitability question (that appears at the last phase of logging at the NGS website) with I don't know.

     

    I still think the question refers to the ability of a satellite to photograph the station (with appropriate marks to aid in identifying the station). When I suggested that earlier I was put in my place like I was butting in.

     

    I sent the question to Deb Brown. The first message bounced so I just sent another. When I hear back from her I will post her reply here.

  16. I thought I understood this until I read this thread. I thought the question was: could a satellite take a photograph of this station?

     

    >Generally, a station is suitable for satellite observations

    >if there is a clear and unobstructed view of the sky from

    >approximately 15 degrees above the horizon at the location

    >of the station. Small objects such as a light pole or

    >small tree are excepted.

    >

    >Is this station suitable for satellite observations?

     

    The term "clear and unobstructed view of the sky" implies visual observation. Am I off base here?

  17. CacheProwler owns 17 caches of various kinds. You could post notes in each one asking him to move your TB along. Just a thought

    I've thought of that but I don't want to resort to that tactic just yet. I looked to see if Geochaching.com had any kind of arbitrators but did not find that.

     

    I'm just looking for ideas before I do something like post in the local Washington geochaching forum. Maybe I can get his buddies to pressure him.

     

    I don’t want to create any animosities right off the bat.

  18. I know this area. Roosevelt Road has been a public road since the base was closed. Just a block away is a baseball diamond that is open to the public. Last time I was on this little side road there was no "No Trespassing" signs or other restrictions. I drove around in the tulies there and encountered HPD (Honolulu Police Department) looking at a stolen and stripped car. He ask what I was doing out there and I explained I was looking for the remnants of the Mooring Mast benchmark. He was satisfied (after I explained about geochaching and benchmarks) and left.

     

    Point 1: If this is a restricted area why did I not see any barriers or signs?

     

    Point 2: If this is Federal property why was HPD there?

     

    Point 3: Why didn’t HPD tell me to leave if it was restricted?

     

    I can go take another look, but I don’t think anything has changed.

  19. I used my GPS on several flights within the US and had no problems as far as the Flight crew. On one flight the Stewardess was concerned and took my GPS up to the cockpit. The F/O said it was not marked as complying with FCC limits for class B digital devices. I then provided the owner's manual that did say it was in compliance. The F/O then said it was OK and I could use it above 10,000 ft.

     

    So my advice is make sure your unit is marked or you can provide the owners manual that list it as Class B compliant.

     

    If they still say no then don't fight it.

     

    68-ELDO

×
×
  • Create New...