Land Surveying Research Tools
Earth Survey is a collection of geodetic tools that run in
Most of the applications have geographical extents associated with the United States,
but MagDec, RINGS, and XYZGE work anywhere on the globe, while HCBM will be of interest
primarily to central Florida surveyors.
QUADS and PLSGE provide easy access to data and image services from the USGS and BLM,
NGSCS is a graphical front end for the NGS station list utility, and seven of the tools
(DeflecGE, GeoidGE, MagDec, NADGE, SPCGE, VERGE, and XYZGE) are graphical front ends
for programs from the NGS Geodetic Tool Kit.
Download the Earth Survey Shortcut for easy access to
Earth Survey tools from the Google Earth embedded web browser.
To preserve the shortcut from one Google Earth session to another,
right-click on Earth Survey and select Save to My Places.
DEFLEC09 for Google Earth (DeflecGE)
DeflecGE is a graphical front end for the NGS
online tool, DEFLEC09. It eliminates the need to input geodetic coordinates and displays
the deflection of the vertical and horizontal Laplace correction in a placemark balloon.
Uses of vertical deflections include geodetic to astronomic coordinate
transformation and astronomic to geodetic azimuth conversion.
Earth Survey Mobile (ESMobile)
ESMobile is a collection of tools that run in
Google Earth 6.2+ on an Android device with OS 2.1+ or an Apple iDevice. A Wi-Fi or 4G
Internet connection is recommended. Earth Survey applications that were written for the
desktop will not run on a mobile device because of user interface, feature, and style
differences. The tools listed here are components from HCBM, NGSCS, PLSGE, and QUADS
that have been modified to run on a tablet or smartphone.
Earth Survey Plugin (ESPlugin)
ESPlugin is an implementation of the GEPlugin version
components from HCBM, NGSCS, PLSGE, and QUADS. All ESPlugin features are supported by
Internet Explorer, Firefox, and Chrome.
GEOID09 for Google Earth (GeoidGE)
GeoidGE is a graphical front end for the NGS online
tool, GEOID09. It eliminates the need to input geodetic coordinates and displays the
converted height and geoid separation in a placemark balloon. Both ellipsoid-to-orthometric
and orthometric-to-ellipsoid height conversions are supported.
Hillsborough County Benchmarks (HCBM)
The principal component of HCBM is a Google Earth KML document
that plots the approximate location of Hillsborough County benchmarks from the LABINS
database. All station balloons have links to the corresponding LABINS datasheet, and
stations with an NGS PID also have links to the NGS database.
Magnetic Declination Calculator (MagDec)
MagDec is a graphical front end for the NGDC online
Magnetic Field Calculators. It eliminates the need to input geodetic coordinates and
displays the calculated magnetic declination and secular variation in a placemark balloon.
NADCON for Google Earth (NADGE)
NADGE is a graphical front end for the NGS online tool,
NADCON. It facilitates the entry of geodetic coordinates and displays the converted
coordinates and datum shift in a placemark balloon. Both NAD83-to-NAD27 and
NAD27-to-NAD83 coordinate conversions are supported.
NGS Control Stations (NGSCS)
NGSCS creates Google Earth network links that plot the
approximate location of NGS control stations within a specified distance of the view
center (Radial Search), within the viewer bounding box (Rectangular Search), or
within a selected county (County Search). Station balloons contain all information
supplied by the NGS station list server and a link to the full NGS datasheet.
PLSS in Google Earth (PLSGE)
The principal component of PLSGE is a Google Earth
implementation of the Bureau Of Land Management (BLM) GeoCommunicator map service.
It retrieves multiresolution images of the BLM Public Land
Survey System (PLSS). PLSGE also includes a section geocoder and an implementation of
the GeoCommunicator Identify service.
USGS Quadrangles (QUADS)
The principal component of QUADS is a Google Earth network
link that plots approximate USGS quadrangle boundaries and provides direct access to more
than 125,000 GeoPDF maps, including scans of the last historical paper map at all available
scales. QUADS also includes overlays for shaded relief maps, topographic-bathymetric maps,
black-and-white orthophotos, and urban areas color orthoimagery.
Range Rings for Google Earth (RINGS)
RINGS is an online tool that draws concentric circles, an
annulus, or a sector in Google Earth. Ring radii may be specified from 10 to 1,000,000 US survey
feet or meters, and from 0.25 to 10,000 miles (1 mi = 5280 US survey ft), nautical miles
(1 nmi = 1852 m), or kilometers. Line and area colors are selected from a 24-color palette,
line width may be specified from 0.1 to 10, and area opacity may be specified from 0 to 100%.
SPCS83 for Google Earth (SPCGE)
SPCGE is a graphical front end for the NGS online tool, SPCS83.
It eliminates the need to input geodetic coordinates and displays the converted coordinates,
convergence angle, and scale factor in a placemark balloon. Both geodetic-to-plane and
plane-to-geodetic coordinate conversions are supported.
UNMAS IATG Quantity Distances (UNMASQD)
Metzger + Willard, Inc. is proud to support the United Nations Mine Action Service (UNMAS)
in their efforts to free the world of landmines and other unexploded or abandoned ordnance.
UNMASQD is an online tool that draws concentric circles in
Google Earth at selected levels corresponding to International Ammunition Technical
Guideline 02.20 (IATG) Quantity Distances (QD) for Hazard Division (HD) 1.1.
VERTCON for Google Earth (VERGE)
VERGE is a graphical front end for the NGS online tool, VERTCON.
It eliminates the need to input geodetic coordinates and displays the converted height and
datum shift in a placemark balloon. Both NGVD27-to-NAVD88 and NAVD88-to-NGVD27 orthoheight
conversions are supported.
XYZ for Google Earth (XYZGE)
XYZGE is a graphical front end for the NGS online tool, XYZ.
It eliminates the need to input geodetic coordinates and displays the converted
coordinates in a placemark balloon. Both geodetic-to-Cartesian and Cartesian-to-geodetic
coordinate conversions are supported.
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