Question

December 8, 2008
/ Print / Reprints /
ShareMore
/ Text Size+

Posted By Paul Montero on 12/6/2008 at 1:59 PM

Good afternoon,

Say your task is to assemble data for a GIS (Geographic Information System) comprising an entire town. Geodetic control is all NAD29 (horizontal) and NAVD88 (vertical) for monuments in the town’s area.

Published values for all of the horizontal control monuments are in NAD29 U.S. Survey feet only. There are approximately twenty (20) horizontal 2nd and 3rd order monuments in the town. Published values for all of the vertical control monuments are in NAVD 88 meters only. There are approximately forty (40) 1st and 2nd order vertical control monuments in the town.

Information available from other sources include digital rectified aerial photographs, digitized topographic maps, wetland delineations and other essential information are published in NAD83 meters. How do you proceed? Do you…

A) Convert the values of the NAD29 horizontal control to meters.

B) Make new observations of the NAD29 monuments in meters.

C) Use the NAD29 datum and recalculate the bench marks to U.S. feet.

D) Other suggestions.

Paul

To read the rest of this thread go to www.i-boards.com/bnp/pob/messages.asp?MsgID=1325330&ThreadID=126160&IsResponse=False#1325330

Did you enjoy this article? Click here to subscribe to POB

Recent Articles by Paul Montero

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

HxGN Live

More than 3,500 attendees from more than 70 countries attended HxGN Live, the annual Hexagon AB user conference, at the MGM Grand Hotel & Casino in Las Vegas on June 3-6. About 450 keynotes and panel discussions were held, and several companies from around the world exhibited their geospatial products. Here are a few snapshots from the event.

POB

POB August 2014

2014 August

In the August 2014 issue, POB explores how John McAslan + Partners used 3D modeling to facilitate the update design of King's Cross Station. Also, read how keeping workers safe on a rocky, steeply sloped mountainside requires precise, reliable monitoring.

Table Of Contents Subscribe

Surveying Career

Would you recommend surveying as a career to a current college student?
View Results Poll Archive

Point of Beginning Store

M:\General Shared\__AEC Store Katie Z\AEC Store\Images\POB\epubsite\Statues-pic-large.gif
Surveyor Statues

The perfect gift or award for any special occasion.

More Products

Clear Seas Research

Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

Geo Locator

Buyers Guide

The #1 buyers' guide for land surveyors and geomatics professionals. Search listings for software and equipment manufacturers, equipment dealers and professional services. CLICK HERE to view GeoLocator.

STAY CONNECTED

Facebook logo Twitter logo  LinkedIn logo  YouTube logoRPLS small logo

Google +