Olivier Martin

Institut national de l’information géographique et forestière | IGN · LOEMI

Various strategies are classically used to monitor land deformation of risky environments. In order to setup a functional monitoring system several constraints must be taken into account: real time remote data availability (in crisis time, the site might be completely inaccessible), the set-up and start-up time of the monitoring system must be as s...

This paper presents a new method for improving the geometric accuracy of photogrammetric reconstruction by modeling and correcting the thermal effect on camera image sensor. The objective is to verify that when the temperature of image sensor varies during the acquisition, image deformation induced by the temperature change is quantifiable, modelis...

Various strategies are classically used to monitor land deformation of risky environments. In order to setup a functional monitoring system several constraints must be taken into account: real time remote data availability (in crisis time, the site might be completely inaccessible), the set-up and start-up time of the monitoring system must be as q...

A brief presentation of an aerial photogrammetric acquisition and the results. For a corridor scene of 1200m, the precision is about 1cm.

Ces dernières années, l'IGN a participé à des expériences de photogrammétrie très haute résolution au cours desquelles des appareils photo numérique (APN) ont été utilisés sur différents types de drones. Cela nous a permis d'affiner les caractéristiques techniques importantes que devrait proposer une nouvelle caméra photogrammétrique ultralégère et...

This article presents a coupled system consisting of a single-frequency GPS receiver and a light photogrammetric quality camera embedded in an Unmanned Aerial Vehicle (UAV). The aim is to produce high quality data that can be used in metrology applications. The issue of Integrated Sensor Orientation (ISO) of camera poses using only GPS measurements...

In Antarctica, locally grounded ice, such as ice rises bordering floating ice shelves, plays a major role in the ice mass balance as it stabilizes the ice sheet flow from the hinterland. When in direct contact with the ocean, the ice rise buttressing effect may be altered in response of changing ocean forcing. To investigate this vulnerable zone, f...

Deformation monitoring of glaciers is of great value to scientists with an interest in climate change. Due to the slow movements of glaciers, a semi-permanent deformation system is the best method to monitor the changes. Using low-cost GPS receivers that work in a wireless sensor network makes such a set-up feasible. © 2015, Geomatics Information a...

The flow of Glacier d'Argentière, French Alps, has been extensively studied by glaciologists for >100 years, but high-temporal- and high-spatial-resolution monitoring of its dynamics has rarely been carried out. In this paper, the terminal part of the main glacier was selected to undertake such a survey. The 2 month experiment (September-November 2...

Monitoring small size area deformations calls for increasingly precise data with greater space and time resolution. To this aim, a GPS data processing method designed for wireless networks of mono-frequency GPS receivers is proposed. The different steps of the method are explained: the GPS processing is first detailed with the design of parametric...

Many geophysical structures such as landslides, glaciers or even volcanoes are features characterized by small extend area and deformation rate in the order of 1 to 10cm per day. Their study needs ever more accurate positioning data with an increased space and time resolution. Using an Ublox LEA-6T GPS receiver, the French national mapping agency I...

Airborne digital photogrammetry has been used for some years to create digital models of the Earth's topography from calibrated cameras. But, in the recent years, the use of non-professionnal digital cameras has become valuable to reconstruct topographic surfaces. Today, the multi megapixel resolution of non-professionnal digital cameras, either us...

IGN CAMv2 project started in 2006 and is composed of two main steps. At first, a four-channel medium format camera system was developed. The basic element of this new system is a camera head built around the Kodak KAF-39 000, 39 mega-pixel array sensor (7,216 × 5,412 pixels). Three systems in this medium format colour configuration, with four nadir...

After 10 years of pioneering aerial digital camera development, IGN's CAMv2 project began in 2006 with the main goal of upgrading the then current system. This had been used for research applications since 1996 in more than six different configurations and in production since 2003 configured with four coloured channels. The new system is still high...

Water vapor measurements from a Raman lidar developed conjointly by IGN and LATMOS/CNRS are used for documenting water vapor heterogeneities in the lower troposphere and correcting geodetic radio-signal propagation delays in clear sky conditions. This instrument has both capabilities for realizing zenith pointing and slant pointing measurements. Du...

The IGN digital camera project was set up in the early 90's and the first research surveys were carried out in 1996. The digital camera was first used in production in 2000 when the DMC and ADS40 systems appeared on the market at the beginning of the 21 st century. Since then, two medium format systems (Applanix DSS322 and DiMAC system) and a...