Surveying, Mapping and GIS

Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development and enterprise architecture...

  • Geospatial Technology, End to End...

    Exploring all aspects of mapping and geography, from field data collection, to mapping and analysis, to integration, applications development, enterprise architecture and policy
Showing posts with label geodetic. Show all posts
Showing posts with label geodetic. Show all posts

Trimble VX Spatial Station

Posted by Dave Smith On 3/06/2007 01:41:00 PM 2 comments


I got a mailing today, probably several others of you did as well - announcing the Trimble VX Spatial Station. I had to chuckle, looking at the Matrix theme they put together for the ad campaign, considering the target as the typical pragmatic, grizzled, muddy-boots, over-50 demographic of surveyors... "wake up, Neo..."



I shouldn't tease Trimble - it is probably a lot more reflective of their own young and forward-looking demographic within Trimble, given their leadership and innovation in many other areas recently. Looks like a great product, and the next natural sequence of evolution as the Robotic/Reflectorless Total Station fuses with the 3D Scanner. It's the sort of thing that gets people like me thinking, what is the next phase of evolution.

For example, I was interested to see such things as fellow SDVOSB Penobscot Bay mounting scanners on robots, as well as another firm that we've worked with in the past, Spatial Integrated Systems / SIS, who has stripped-down scanners for confined spaces, such as on submarines.

So what's next in the far, or maybe not-so-far future? Perhaps a fusion of GPS and other technologies as well - a device you can carry in your pocket, which, when whipped out, establishes its geodetic position to centimeter level, scans the environment, and instantly constructs a georeferenced, 3-D spatial and temporal virtual environment, and stitches it in with other models already captured for a seamless database. Perhaps hyperspectral sensors, spectroscopy to determine the materials of the environment and more...

Imagine the design tools - you capture the environment, then don a headset which lets you mold and sculpt the environment in 3-D almost like it was wet clay. As you modify things, a number of models run simultaneously - finite elements analysis examining the structural details, other routines running to examine other impacts - stormwater and erosion, traffic, you name it.

Hey, a guy can dream, can't he?

NGS 10-Year Plan: Call for Comments

Posted by Dave Smith On 2/23/2007 07:17:00 PM 0 comments

The National Geodetic Survey, in keeping with quite a few innovations and revelations to coincide with their 100th anniversary, has unveiled a copy of their 10-year plan, and are soliciting comment:

During the last year, NGS has spent considerable effort refining its mission, vision and strategy for the future. The result of this effort is the NGS 10 year plan. Because any plans for the future will affect the NGS stakeholders and the general public, NGS is releasing this plan in draft form for a public comment period lasting until March 31, 2007. NGS is interested in hearing all feedback on the proposed plan over the next few weeks. NGS will also discuss and take comments on the 10 year plan at the ACSM conference in St. Louis. This will take place during the first half (8:30 a.m. - Noon) of the "National Geodetic Survey and Partners" meeting on Sunday, March 11.

Please note that this document is in draft form. At this time NGS is seeking comments on the content of the plan. Once those comments have been received and incorporated into the plan the document will undergo a professional editorial review to address administrative (spelling, punctuation, etc.)
issues. Following the public comment period, NGS will consolidate all feedback and issue a final copy of the 10 year plan some time in April 2007.

Click here to download the draft of the NGS 10 year plan.
Click here to go to the comment template for providing feedback on the plan.Comments will be mailed to the NGS 10 year plan working group.



I am currently reviewing the document, it's around 42 pages. Some interesting touchpoints within the document:

"...the geodetic latitude, longitude and height of points used in defining the NSRS should have an absolute accuracy of 1 millimeter at any time."

"...the gravimetric geoid used in defining the NSRS should have an absolute accuracy less than 1 centimeter anyplace at any time."

"NGS will publish all coordinates of defining points of the NSRS with an epoch tag and will furthermore publish velocities relative to that epoch-tagged set of coordinates."

"NGS will therefore publish all coordinates and velocities of NSRS defining points in both the most recent official U.S. Datums and the most recent realization of the International Terrestrial Reference Frame (ITRF). Furthermore, NGS will provide simple transformation tools between all historic and current datums and reference frames used by NGS, in 4 dimensions if possible."

and...

"NGS will validate local capacity for accurate positioning through direct interaction with a county geospatial representative and evaluation of that county’s access to the NSRS."

Thanks to John Halleck for pointing some of these out, to pique everyone's interest. Some very lofty goals indeed...

I just came across a spanish-language blog, called TopoNorte - the author features a wide variety of great geospatial and surveying content. Some items I thought were particularly great:
Cadastral mapping of Spain, using Google Maps: http://www.goolzoom.com/


And here, a publication on geodesy and UTM grids by Professor Ignacio Alonso Fernández-Coppel at the University of Valladolid:

http://www.elagrimensor.com.ar/elearning/lecturas/Las%20coordenadas%20geograficas.pdf

Posted by Dave Smith On 2/12/2007 10:25:00 PM 0 comments

Thanks to Gene Kooper for this great illustration of a theodolite from J. Johnson's 1886 text, "Theory and Practice of Surveying".




NGS 200th Anniversary and NAD83(NSRS 2007)

Posted by Dave Smith On 1/28/2007 07:07:00 PM 0 comments


The 200th Anniversary of the National Geodetic Survey is coming up - from origins as the Survey of the Coast, signed into existence by Thomas Jefferson, on February 10th, 1807 to the present, a legacy of much excellent work. NOAA and NGS have many events planned in celebration of their 200-year legacy of success.

With this, also comes the unveiling of the National Readjustment of NAD83 - NAD83(NSRS 2007). A key benefit of this will be in that this adjustment will be performed using all data in the National Spatial Reference System (NSRS), as opposed to the previous efforts, which were statewide and regional. The first, NAD83(1986) was performed on states, multi-state regions and so on.
Later on, with improved GPS capability came NAD83(HARN), referencing the High-Accuracy Reference Network. This exposed positional issues in the previous NAD83(1986) adjustment, and again, the HARN adjustments were performed on a state or regional basis.

As time progressed, we saw the emergence of the national Continuously-Operating Reference Stations (CORS) system - and with this, we gained a national network of GPS coordinates, which however exposed inconsistencies with the state and regional networks.
Now, with NAD83(NSRS 2007), 70,000 GPS points nationwide have been put into the mix, in a massive effort to place all of these on a common reference system, to eliminate the longstanding inconsistencies from adjustment to adjustment, network to network. With the excellent leadership of people at NGS like Dave Doyle, this release will be a boon to survey-grade, geodetic projects nationwide.


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PSLS Conference

Posted by Dave Smith On 1/22/2007 09:22:00 AM 0 comments


I am looking forward to spending some time over the next few days at the Pennsylvania Surveyors' Conference. It's always a great time to catch up with old friends, as well as get some updates on various things going on in the world of surveying and mapping. This year I am going to focus on the GPS track, something I have not been doing my due dilligence on of late.

On another note, it's beginning to amaze me how many geospatial-related conferences are cropping up of late. I just got a notice of the Rocket City conference in Huntsville, and there have been several others in the last few months and more upcoming. I can certainly understand thematic conferences, regional ones, vendor-
oriented ones... but are we getting to the point where there are just too many?



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"Longitude" - by Dava Sobel

Posted by Dave Smith On 1/15/2007 10:48:00 PM 0 comments

I just finished reading Longitude, by Dava Sobel. An enjoyable read, presented in a great anecdotal style, with plenty of colorful detail and insight into some of the joys and tribulations of John Harrison's attempt to conquer the challenge of accurate determination of longitude. Sobel lays out the background for the challenge, with tragedy at sea and other powerful driving forces, to include a challenge, with a virtual fortune ostensibly to be recieved by the winner...

The dynamic of battles between clockmakers and astronomers, and beyond this, the twists and turns introduced by the both arbitrary and capricious, yet bureaucratic and obstinate Board of Longitude are presented with great wit by Sobel, with our self-taught clockmaker protagonist, John Harrison showing tremendous brilliance and tenacity in the face of adversity after adversity.

A well written, well-researched, and extremely well-presented tale, if with odd continuity from chapter to chapter - I highly recommend it to anyone with an interest in science. Sobel spins an excellent tale, against a richly woven tapestry featuring many other great figures in 18th-century history, such as Astronomers Royal John Flamsteed, Edmond Halley, and Nevil Maskelyne, Captains Cook and Bligh, King George III and many others.

As fast as I read, the stack grows faster... Currently on the stack are re-reading Gödel, Escher, Bach, by Douglas R. Hofstadter, Drawing the Line: Tales of Maps and Cartocontroversy, by Mark Monmonier, I have Tales of the Dervishes by Idries Shah, Metamagical Themas (another Hofstadter book), The Geographer at Work, Mental Maps and a few others from my late Penn State professor Peter Gould and quite a few others working their way to the top of the stack...



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