Mean Sea Level (MSL)

Hello All,

I have a project in Alabama that is located on the south end, not very close to the coast, but close to a river connected to the coast.  I have never used MSL, but I am working with an engineer that has a need to use MSL.  As a designer, I

Transformation and Projection

Hello,

I am a Civil Engineer with limited survey experience and have been reviewing Transformation and Projection concepts.

I noticed the idea of scale factor as it relates to transformations refers to the idea of moving points from ground to grid.  Th

VERTICAL DATUM VS MSL

Hello,

I am a Civil Engineer with limited survey knowledge and have been reviewing geodetic concepts and the subject of vertical datum.  In the civil engineering profession, many times a day I see reference to MSL but know the surveyor has indicated N

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 constitut

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 l

"GRID" TERMINOLOGY

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 the terms "On the Grid" often.  Also, I see the ter

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 s

GEOID ELEVATION

Hello,

I am a novice surveyor learning about the geoid and its used in calculating elevation.  In my research I see the reference made to H=h-N and recognize the two paths to a point, one from the ellipsoid representing "h" and one from the geoid repr

GEODETIC NORTH

Hello,

I am a novice surveyor learning the fundamentals behind coordinate systems and have a questions regarding geodetic north.  I understand that true north is the geographic north, or the location of longitude convergence.  I think of this location