608
September 2017
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
about positioning on the Earth surface. The significant technical improvements and
cost reduction of GPS technology made this technology open to everyone, being civilian
or military. At present, reference frames are being accurately defined by means of
permanent stations set up all over the planet. These stations continuously receive data
from the NAVSTAR and GLONASS satellites. This system is named after its English
acronym: GNSS (Global Navigation Satellite System), and the stations globally make
reference frames materialized on the ground.
“In 1988, following the international trend, Argentina generated a Project related
to the installation of permanent GNSS stations which contribute to the National
Geodetic Reference Frame. The Project is named RAMSAC (Argentine Continuous
Satellite Monitoring Network) and its main goals are: Contribute to the maintenance
and updating of the National Geodetic Reference Frame (The Argentine National
Geographic Institute is responsible for it). Contribute with permanent GNSS stations
in order to keep the International Terrestrial Reference Frame (ITRF). Meet technical
requirements from users of modern satellite positioning techniques. Advise and
cooperate with all Agencies willing to join the RAMSAC Network and set up new
permanent GPS stations, so their data may be uploaded on the internet and easily and
freely accessed.
“The National Altimetric Network consists of about 2000 leveling lines which consist
of 35,000 monuments built up all over the Argentine Republic, located next to routes
and roads. These monuments show the height above sea level. The IGN determined
the zero reference level by means of mareographic observations in the city of Mar del
Plata. That is to say, that the height of monuments is referred to the mean sea level
determined in Mar del Plata”
(Mr. Ruben Rodriguez, Personal Communication, July
2017).
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 Photogrammetry and Remote Sensing and/or the Louisiana
State University Center for GeoInformatics (C
4
G).
This column was previously published in
PE&RS
.
‘truth’. Together, Monmonier’s work
and Brewer’s give a full grip of the
tenuous position of the mapmaker
in today’s society – data manager,
marketer, artist… tasked with rep-
resenting the world’s shifting com-
plexity in two-dimensional space.
Those familiar with ESRI pub-
lications of the last decade or so
might expect this book to be a glossy
coffee table publication, not far re-
moved from an overgrown market-
ing brochure – long on looks, light
on practical content. But this book
is clearly the result of decades of the
author’s experience both authoring
expert maps and teaching courses
on data analysis/representation.
Making Better Maps put some
depth and breadth back into ESRI’s
suite of publications, and we hope
there are more like this to come.
eeeàfff
Ellie Maclin is a Project Manager at
Allworld Project Management and
she thanks Jessie Baker, Allworld
cartographer extraordinaire, for her
suggestions and input.
Book Review
continued from page
