Olivier Francis
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View article: Least Squares Collocation for Estimating Terrestrial Water Storage Variations from GNSS Vertical Displacement on the Island of Haiti
Least Squares Collocation for Estimating Terrestrial Water Storage Variations from GNSS Vertical Displacement on the Island of Haiti Open
Water masses are continuously redistributing across the Earth, so accurately estimating their availability is essential. Global Navigation Satellite Systems (GNSSs) have demonstrated potential for observing vertical deformations, which is …
View article: Micro-gravimetry for archaeological voids detection in preventive archaeology
Micro-gravimetry for archaeological voids detection in preventive archaeology Open
Gravimetric profiles measured over air-filled medieval shelters, Air-filled medieval shelters were successfully detected, Gravimetry can be useful in preventive archaeology under certain conditions
View article: Vertical Gravity Gradient Measurements in the Yellowstone National Park in August 2014
Vertical Gravity Gradient Measurements in the Yellowstone National Park in August 2014 Open
This report contains the results of relative gravity measurements carried out in the Yellowstone National Park (YNP) in August 2014. These data are used to determine the vertical gravity gradient at the sites where absolute gravity measure…
View article: A Precise Gravity Tide Model for Port-au-Prince in Haiti
A Precise Gravity Tide Model for Port-au-Prince in Haiti Open
In this report, we present the results of earth tides analyses of long gravity time series at two different locations in the city of Port-au-Prince in Haiti. Measurements from two different generations of relative spring gravimeters are us…
View article: Editorial note for the geodesy and geodynamics journal special issue contemporary research in geodynamics and earth tides - Selection from the 19th international symposium on geodynamics and earth tides, 2021, Wuhan, China
Editorial note for the geodesy and geodynamics journal special issue contemporary research in geodynamics and earth tides - Selection from the 19th international symposium on geodynamics and earth tides, 2021, Wuhan, China Open
International audience
View article: Long time series of absolute gravity observations in Kulusuk, southeast Greenland
Long time series of absolute gravity observations in Kulusuk, southeast Greenland Open
This report contains terrestrial absolute gravity measurements performed near the village of Kulusuk in southeast Greenland. It represents an exceptionally long time series of nearly two decades. The measurements began in July 1996 until J…
View article: Absolute Gravity Measurements at the base of the Grossglockner in the Austrian Alps in September 2021
Absolute Gravity Measurements at the base of the Grossglockner in the Austrian Alps in September 2021 Open
This report contains the results of absolute gravity measurements carried out at the base of the Grossglockner in the central eastern Alps during the month of September 2021. The Grossglockner is the highest mountain in Austria with an alt…
View article: Absolute Gravity Measurements at the Alpine Research Centre in Obergurl (Austria) in September 2021
Absolute Gravity Measurements at the Alpine Research Centre in Obergurl (Austria) in September 2021 Open
This report contains the results of absolute gravity measurements carried out at Alpine Research Centre (University of Innsbruck) in Obergurgl. The measurements took place on the pier 0-173-02 (Figure 1) in September 2021. The absolute gra…
View article: Absolute Gravity Measurements at the base of the Grossglockner in the Austrian Alps in September 2021
Absolute Gravity Measurements at the base of the Grossglockner in the Austrian Alps in September 2021 Open
This report contains the results of absolute gravity measurements carried out at the base of the Grossglockner in the central eastern Alps during the month of September 2021. The Grossglockner is the highest mountain in Austria with an alt…
View article: Absolute Gravity Measurements at the Alpine Research Centre in Obergurl (Austria) in September 2021
Absolute Gravity Measurements at the Alpine Research Centre in Obergurl (Austria) in September 2021 Open
This report contains the results of absolute gravity measurements carried out at Alpine Research Centre (University of Innsbruck) in Obergurgl. The measurements took place on the pier 0-173-02 (Figure 1) in September 2021. The absolute gra…
View article: Geodetic climate research in the Austrian Alps
Geodetic climate research in the Austrian Alps Open
<p>The Federal Office of Metrology and Surveying (BEV) in Austria is responsible for the geodetic reference system like gravity and height reference frame. Some of these gravity reference stations are monitored regularly by different…
View article: Absolute Gravity Measurements in the Geology Building of the University of Utah Salt Lake City
Absolute Gravity Measurements in the Geology Building of the University of Utah Salt Lake City Open
This report contains the results of absolute gravity measurements carried out on the first floor of the geology building of the campus of the University of Utah in Salt Lake City (USA) in September 2021. The measurements took place on a pr…
View article: Absolute Gravity Measurements in the Geology Building of the University of Utah Salt Lake City
Absolute Gravity Measurements in the Geology Building of the University of Utah Salt Lake City Open
This report contains the results of absolute gravity measurements carried out on the first floor of the geology building of the campus of the University of Utah in Salt Lake City (USA) in September 2021. The measurements took place on a pr…
View article: SNR-Based GNSS-R for Coastal Sea-Level Altimetry
SNR-Based GNSS-R for Coastal Sea-Level Altimetry Open
Geodetic Global Navigation Satellite System reflectometry (GNSS-R) uses ground-based signals of opportunity to retrieve sea levels at an intermediate spatial scale. Geodetic GNSS-R is based on the simultaneous reception of Line-of-Sight (L…
View article: The Absolute Gravity Network of Haiti
The Absolute Gravity Network of Haiti Open
The establishment of the absolute gravity network of Haiti started in November 2016 in the framework of a “Protocole d’Accord” between the Faculty of Sciences, Technology and Communication of the University of Luxembourg and the “Unité de …
View article: Can GNSS-R Detect Abrupt Water Level Changes?
Can GNSS-R Detect Abrupt Water Level Changes? Open
Global navigation satellite system reflectometry (GNSS-R) uses signals of opportunity in a bi-static configuration of L-band microwave radar to retrieve environmental variables such as water level. The line-of-sight signal and its coherent…
View article: Output data for manuscript "Tidal analysis of GNSS reflectometry applied for coastal sea level sensing in Antarctica and Greenland"
Output data for manuscript "Tidal analysis of GNSS reflectometry applied for coastal sea level sensing in Antarctica and Greenland" Open
We retrieve sea levels in polar regions via GNSS reflectometry (GNSS-R), using signal-to-noise ratio (SNR) observations from eight POLENET GNSS stations. Although geodetic-quality antennas are designed to boost the direct reception from GN…
View article: Output data for manuscript "Tidal analysis of GNSS reflectometry applied for coastal sea level sensing in Antarctica and Greenland"
Output data for manuscript "Tidal analysis of GNSS reflectometry applied for coastal sea level sensing in Antarctica and Greenland" Open
We retrieve sea levels in polar regions via GNSS reflectometry (GNSS-R), using signal-to-noise ratio (SNR) observations from eight POLENET GNSS stations. Although geodetic-quality antennas are designed to boost the direct reception from GN…
View article: Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids
Gravity Monitoring of Underground Flash Flood Events to Study Their Impact on Groundwater Recharge and the Distribution of Karst Voids Open
Flash flood events are expected to become increasingly common with the global increases in weather extremes. They are a significant natural hazard that affects karst landscapes, which host large resources of drinking water worldwide. The r…
View article: Impact of Atmospheric Circulation on Flooding Occurrence and Type in Luxembourg (Central Western Europe)
Impact of Atmospheric Circulation on Flooding Occurrence and Type in Luxembourg (Central Western Europe) Open
<p>In the second half of the 20<sup>th</sup> century, hydrological regimes in central Western Europe were largely characterised by large-scale winter floods. This type of event was predominantly triggered by westerly atmo…
View article: Measuring gravity changes for decades
Measuring gravity changes for decades Open
<p>Being sensitive to any phenomena associated with mass transfer, terrestrial gravimetry allows the monitoring of many phenomena at the 10<sup>-10</sup> g level (1 nm/s&#178;) such as Earth tides, groundwater content…
View article: Long-term monitoring with spring-based gravimeters: tilt-control benefits and application to the Rochefort Cave Laboratory (Belgium)
Long-term monitoring with spring-based gravimeters: tilt-control benefits and application to the Rochefort Cave Laboratory (Belgium) Open
<p>Spring-based gravimeters are light and easy to install, with a precision around 5 &#956;Gal/&#8730;Hz. However, they are still not used for long-term gravity monitoring. The main reason for that is the non-linear drift of …
View article: The results of CCM.G-K2.2017 key comparison
The results of CCM.G-K2.2017 key comparison Open
The CCM.G-K2.2017 comparison was organised for the purpose of determination of the degree of equivalence of the national standards for free-fall acceleration measurement. The comparison was held in the Changping Campus of National Institut…