Chuck Turlington
  • Greenville, SC
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Chuck Turlington's Discussions

GRS80-ORIGIN

Started Jun 13 0 Replies

 Hello,I am a Civil Engineer with limited survey knowledge and have been reviewing geodetic concepts and the ellipsoid datums.  I came across confusion regarding the origin of GRS80 thinking it was…Read more →

NAD ADJUSTMENTS

Started this discussion. Last reply by Chuck Turlington Jun 13. 5 Replies

Hello,I am a civil engineer with limited site survey experience.  I have been reviewing the various NAD adjustments such as NAD83(2011), NAD83(HARN), etc. and have a question.  I understand the…Read more →

GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS

Started this discussion. Last reply by CHARLIE B. AYCOCK, III Jan 8. 10 Replies

Hello,I am a civil designer with limited survey experience.  I am learning about the concepts behind geographic coordinate projections.  I understand to change from a 3d geographic coordinate to a…Read more →

"GRID" TERMINOLOGY

Started Jan 3 0 Replies

Hello,I am a civil designer with limited survey experience, trying to understand more fully the concepts behind coordinate systems and transformations.In my reading and review of the subject, I read…Read more →

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Chuck Turlington's discussion was featured

NAD ADJUSTMENTS

Hello,I am a civil engineer with limited site survey experience.  I have been reviewing the various NAD adjustments such as NAD83(2011), NAD83(HARN), etc. and have a question.  I understand the differences between these adjustments does not constitute a change in the ellipsoid.  It sounds like the adjustments are more about the method data is collected, not about the ellipsoid.  The adjustments appear to involve more accuracy reference networks, additional base stations and networks added, not…See More
Wednesday
Chuck Turlington posted a discussion

GRS80-ORIGIN

 Hello,I am a Civil Engineer with limited survey knowledge and have been reviewing geodetic concepts and the ellipsoid datums.  I came across confusion regarding the origin of GRS80 thinking it was earth centered, earth fixed.  But several articles later, I found it was actually tied to the tectonic plates by permanent monuments.   But it still remains unclear if the NAD83 datum is actually assumed to be centered on earth or anchored to the ground by monuments / base stations more like the…See More
Jun 13
Chuck Turlington replied to Chuck Turlington's discussion NAD ADJUSTMENTS
"So it sounds like when a transformation is done to an ellipsoid, you are actually transforming the adjustments along with it, like transforming the datum "realization" ?"
Jun 13
Joe Evjen replied to Chuck Turlington's discussion NAD ADJUSTMENTS
"A datum has a lot of as-built aspects to it, various biases and mistakes are forced into all the coordinates over time, as you by necessity build up the network by tying into older and imperfect control.Eventually NGS gets annoyed by all the…"
Jun 8
Sean Simmons replied to Chuck Turlington's discussion NAD ADJUSTMENTS
"The ellipsoid is just a mathematical tool to hang geometric coordinates on it hasn't changed much since 1866. It is akin to a paper map, you can measure a 300 mile road trip with confidence, but a 3000 mile airplane trip is going to need a…"
Jun 8
Derek Lynn Losey replied to Chuck Turlington's discussion NAD ADJUSTMENTS
"NAD83 SPC use a GRS80 Ellipsoid, I am pretty sure the difference is exactly what you have mentioned, and the EPOCH or date that the adjustment was made."
Jun 8
Maurice Heter replied to Chuck Turlington's discussion NAD ADJUSTMENTS
"Very good question. The ellipsoid  is a mathematical model of the earth, that's it, nothing physical about."
Jun 7
Chuck Turlington posted a discussion

NAD ADJUSTMENTS

Hello,I am a civil engineer with limited site survey experience.  I have been reviewing the various NAD adjustments such as NAD83(2011), NAD83(HARN), etc. and have a question.  I understand the differences between these adjustments does not constitute a change in the ellipsoid.  It sounds like the adjustments are more about the method data is collected, not about the ellipsoid.  The adjustments appear to involve more accuracy reference networks, additional base stations and networks added, not…See More
Jun 6
Chuck Turlington's discussion was featured

GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS

Hello,I am a civil designer with limited survey experience.  I am learning about the concepts behind geographic coordinate projections.  I understand to change from a 3d geographic coordinate to a 2d map, that a projection is required.  However, it seems to me that to change survey data from an ellipsoid grid to a ground survey, also involves a projection.  Is my understanding correct and is the projection handled the same way ?See More
Jan 9
CHARLIE B. AYCOCK, III replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"Before you can define an elevation, you have to specify what you are talking about & you have to define the datum you are using. The elevations most often refereed to are orthometric or the vertical distance above or below the geoid measured…"
Jan 8
David Mlekwa replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"No, the only deference between the 3d Coordinates from 2d coordinates is the z value in the 3d that represents height information, unless you have a different problem but from 3D to 2D you only need to emit the z value column, position information,…"
Jan 8
CHARLIE B. AYCOCK, III replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"Well, the above is mostly true, especially when you are only concerned with practical field application. In this country, State Plane coordinates are generally based on either a Lambert or a Mercator projection. They are not flat but are designed so…"
Jan 7
Survenator favorited Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
Jan 6

Seeking Employment
David Andrés Herrera Arango replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"When performing a topographic survey is not projected anything, is only measured on the ground, is considered land as flat (for small areas), projection is a faithful form of land representation and each country adopts the system That will be used…"
Jan 6
Chuck Turlington replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"Is it possible to scale a 3d geographic coordinate to a "ground" survey without projecting the coordinate to a flat map ?"
Jan 6
Dean Burke replied to Chuck Turlington's discussion GEOGRAPHIC COORDINATE SYSTEM PROJECTIONS
"Chuck, what are the extents of the survey that you are working on? As John said- unless you are working on large areas or very long distances such as highways the difference will be negligible. Also check with the surveyor as some will include the…"
Jan 6

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I am here because I am a.
Student
Introduction to other Surveyors. One or more sentence Bio about your Relationship with Surveying
I am a Student Surveyor and Civil Engineer Designer. I am interested to learn more about the concepts behind datums and GIS technology. I have been working with some survey boundaries and downloading survey data into cad software.
Company
Geosyntec Consultants
Licenses Certifications or Awards
Civil Engineer EIT
I have experience with the following
GPS, boundary surveys, construction staking, teaching, Aerial, Student of Surveying
How many years have you been surveying?
1
Most comfortable with the following types of instrumentation
GPS, Automatic Levels, Old school surveying, theodolite, compass

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