PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
November 2019
785
STAND OUT FROM THE REST
earn asprs
certification
ASPRS congratulates these recently Certified and Re-certified individuals:
RECERTIFIED PHOTOGRAMMETRISTS
Bill Nielsen, Certification # R1565
Effective March 7 2019, expires March 7 2024
John Gearhard, Certification #R1236
Effective May 7 2019, expires May 7 2024
Eric Stone, Certification # R1555
Effective Aug 22 2018, expires Aug 22 2023
Richard D. Day, Certification # R1390
Effective March 18 2019, expires March 18 2024
Krysia Sapeta, Certification # R1156
Effective April 7 2019, expires April 7 2024
Charles Toth, Certification # R1082
Effective March 18 2019, expires March 18 2024
Brian Tolley, Certification # R1391
Effective March 18 2019, expires March 18 2024
Michael Vessel, Certification # R1361
Effective June 15 2018, expires June 15 2023
According to John W. Hager, “ … the station name of
HIRAN 14 AMS 1962 and latitude and longitude values
(seconds only) of 53.25" and 19.22". This is a difference of
8.27 meters. The equipment in 1962 was quite bulky and I
think that this later value represented the HIRAN antenna
position and that the astro was located the 8.27 meters
away. Another reason for having the astro point and the
antenna some distance apart is that they would be making
the HIRAN measurements simultaneous with or before they
would complete the astro observations.” The ellipsoid of ref-
erence for the Zanderij Datum of 1962 is the International
1924 where a = 6,377,388 m and 1/f = 297. The projection
adopted for this datum is the Suriname Gauss-Krüger
Transverse Mercator Grid, where the Central Meridian
λ
o
= 55° 41' W, the False Northing = zero, and the False
Easting = 500 km. Two scale factors at origin have been
noticed with this grid: m
o
= 0.99975 and m o = 0.9999, the
latter observed on some 1:50,000-scale maps dated around
1978. The most common scale factor for the Suriname TM
Grid is m
o
= 0.99975.
In 1996, the U.S. National Geodetic Survey observed a
number of positions with GPS receivers, one point being
“008 Astro ECC 19" where φ = 5° 26' 54.62257" N and
λ = 55° 12' 19.04" W. Although this is a different point
than the old datum origin, the similarity of the coordinates
show how close the NAD83 Datum is to the old Zanderij
1962 Datum. Proof of the pudding is the three-parameter
shift values published by NIMA in TR8350.2, 03 January
2000 where from Zanderij to WGS84: ∆X = –265m ± 5m,
∆Y = +120m± 5m, and ∆Z = –358m ± 8m. The NIMA solu-
tion was based on five collocated points. Thanks for a lot of
help on Suriname go to John W. Hager and to Mark Nettles.
Update
A
fascinating account of a boundary recovery survey
used in the Guyana-Suriname Maritime Boundary
Delimitation by David H. Gray of Ottawa Canada is
found at:
/
c38aa6bdbac5a7359a6714d90eb9e9193ae8.pdf
The contents of this column reflect the views of the author,
who is responsible for the facts and accuracy of the data
presented herein. The contents do not necessarily reflect the
official views or policies of the American Society for Photo-
grammetry and Remote Sensing and/or the Louisiana State
University Center for GeoInformatics (C4G).
This column was previously published in
PE&RS
.
ASPRS Certification validates your professional practice and experience.
It differentiates you from others in the profession.
For more information on the ASPRS Certification program:
contact
visit
Tips & Tricks continued from page
On my Intel i7/32GB RAM computer, these files were
generated in less than five seconds at the command prompt!
To be fair, you can also generate the files using the LP360
GUIs following the LP360 user-manual instructions, but
for large projects involving several hundred .LAS files, the
command prompt is really convenient. And do not forget,
you can call these programs from scripts.
Al Karlin, Ph.D., CMS-L, GISP is with Dewberry’s geospatial
and technical services group in Tampa, Florida. As a senior
GIS professional, he works with all aspects of lidar, remote
sensing, photogrammetry, and GIS-related projects.
