Friday, January 25, 2008
Let's Talk About Something Different
Monday, January 21, 2008
What is a Datum?
"A geodetic datum is any numerical or geometrical quantity or set of such quantities that serves as a reference or base for other quantities." (James R. Smith, 1997, Introduction to Geodesy, page 83)
This definition basically says that datums are references. References are simply the "starting points" from which measurements are taken. A reference can be as simple as giving a friend directions to your house by saying, "I live across the street from Bob's house." These directions use "Bob's house" as their reference or datum point. Note that these directions will only make sense to someone who understands your reference: someone who didn't know where "Bob's house" was would still have no idea where you lived.
In surveying a datum is very similar to the above example: simply a point of reference. Oh, if only it were that simple....
The introduction of GPS and GIS has made this one of the most complicated issues dealt with on a regular basis by surveyors. Local jurisdictions including cities, counties, states, utility districts, etc. all require surveys to be referenced to a given datum. The problem arises in that they don't all have the same datum requirements and there are just so many to choose from. Throw on top of that different datum requirements from the multitude of federal agencies we provide surveys for and you begin to understand the confusion that can arise when the word datum is spoken.
Here is just a partial list of datums we work with on a regular basis:
First is the Horizontal datums.
- North American Datum (NAD) of 1927
- North American Datum (NAD) of 1983; This one is even more complicated because of continuing adjustments over the years so you get NAD83/86, NAD83/91, NAD83/97, and so on.
- High Accuracy Reference Network (HARN) and High Precision Geodetic Network (HPGN)
- And, of course, the always fun "Assumed"
Now we move on to the Vertical datums which are even more complicated and convoluted.
- National Geodetic Vertical Datum (NGVD) of 1929
- North American Vertical Datum (NAVD) of 1988
- National Geodetic Survey Geoid-96
- USACE Ballard Locks Datum
- Tidal Datums (varies across the state along tidal shorelines)
- And, again, "Assumed"
Thursday, January 17, 2008
Be Careful Out There!
Surveying this time of the year can always be a bit more challenging but the guys are all doing a great job and staying safe. Of course, it does take longer to get to the projects when road conditions are poor and production drops. But all of this is to be expected and we just continuously look for creative ways to keep efficiencies up.
16 weeks! I am now back into full training mode for my next marathon. I'm going to try once again to Boston Qualify at the Vancouver BC marathon on May 4th. One of the percs of getting older is the qualifying time keeps getting higher. I now have to complete 26.2 miles in 3:30 minutes or 8 minutes per mile. Portland was close, 3:38, and I felt amazingly well in the final miles so it should be a doable goal. Of course, I would also like to lose an additional 10 pounds to help me reach that 3:30 goal a little easier. The good thing about running really long distances is that it hurts up to a point and then it doesn't get any worse! :-)
Cheers to All!
Monday, January 7, 2008
2008, It's Official!
- Survey Director: Licensed in every known state in the US.... well, that is if you only know 5 of 'em. Jeremiah Dixon only wished he had known as much about surveying as this dude does. A real coach when it comes to managing people.
- Senior Project Manager: Acquired his professional license at barely 30 years old. One of the most client based service oriented guys I have ever met. Give him a computer and some I's and O's and he'll have a map of something whipped out in no time.
- Junior Project Manager: Every now and then you run into someone who just makes you say wow. Wow! This dude just got his Land Surveyor in Training certification this past summer. If you ever need anything, even if you don't know what that "anything" is, this guy will get it done. I don't think I have ever met anyone that was more intuitive.
- Senior Field Techs: Creative! We give these dudes some maps, a few blurted instructions, and say "get 'er done" and, I'll be damn, they do just that. Me: Map that cliff... SFTs: how? Me: I don't know! SFTs: No worries, we'll figure it out.
- The Rest: Dedicated to the cause and overwhelmingly accommodating.
Tuesday, January 1, 2008
Happy New Year!
Wow, a new year beginning already. '07 went by in a flash and was successful in so many ways both on a personal and professional level. It's hard to believe that we are now in our 7th year of business here at PGS. I would like to thank all of our Clients, Associates, Vendors, and friends for helping to make '07 another year of growth with many successful projects completed and new relationships developed.
- Joshua Tree in Feb. Desert climbing at it's best. A good place to spend time with a great friend.
- Vancouver Marathon in May. Lots of suffering. 3:42.
- Swiftsure Race in May. Fast sailboats, big ocean swells, and good friends.
- Moto GP at Laguna Seca in July. Faster motorcycles with fearless riders. A week of motorcycles with my son.
- Oregon Backcountry Discovery Route in Sept. Dirt, rocks, large bike, lots of broken pieces. A week spent with some of the best people on earth.
- Portland Marathon in Oct. Shared with a brother, best of times. 3:38
- Maui in Nov. Celebrating 29 years with my very best friend. Love you Sue!
- Unbelievable depth and growth within our team.
- I'm beginning to place more and more trust in my team and giving them more control of operations.
- Won an on-call professional services contract with a major Federal agency.
- Developed many new relationships with some wonderful firms. Big thanks for all the work.
- Continued to build relationships with Associate firms allowing for sharing of resources.
- Wow, some really cool projects located in some really neat locations.
- A new piece of equipment putting us at the very top of the technology curve.
- The BEST employees in the world!!! Thanks guys!