This textbook aims at expanding basics of GIS programming for Vector, Database and Raster. It sho... more This textbook aims at expanding basics of GIS programming for Vector, Database and Raster. It should be taken as an overview more than an thorough material, and by no mean dealing with all of the subject. After going through this book, the reader will be able to have a basic knowledge of the technology available for GIS data programming, and a good practical hand on most common ways to investigate them.
Programming starter book for remote sensing raster processing. Includes full public domain code w... more Programming starter book for remote sensing raster processing. Includes full public domain code with explanations for GDAL API (C, python, OpenMP, MPI-C, CUDA, OpenCL, WxPython), C for GRASS GIS, pyGRASS and R (using raster package).
Monitoring of water and land objects enters a revolutionary age with the rise of ubiquitous remot... more Monitoring of water and land objects enters a revolutionary age with the rise of ubiquitous remote sensing and public access. Earth monitoring satellites permit detailed, descriptive, quantitative, holistic, standardized, global evaluation of the state of the Earth skin in a manner that our actual Earthen civilization has never been able to before. The water monitoring topics covered in this book include the remote sensing of open water bodies, wetlands and small lakes, snow depth and underwater seagrass, along with a variety of remote sensing techniques, platforms, and sensors. The Earth monitoring topics include geomorphology, land cover in arid climate, and disaster assessment after a tsunami. Finally, advanced topics of remote sensing covers atmosphere analysis with GNSS signals, earthquake visual monitoring, and fundamental analyses of laser reflectometry in the atmosphere medium.
Availability of rainfall time-series is limited in many parts of the World, and the continuity of... more Availability of rainfall time-series is limited in many parts of the World, and the continuity of such records is variable. This research endeavors to extend actual daily rainfall observations to ungauged areas, taking into account events of rainfall as well as cumulative total daily rainfall, over a period of 11 years. Results show that rainfall events histograms can be reconstructed, and that total cumulative rainfall is estimated with 85% accuracy, using a surrounding network of rain gauges at 30-50 Km of distance from the point of study. This research can strengthen various types of research and applications such as ungauged basins research, regional climate modeling, food security early warning systems, agricultural insurance systems, etc.
The rainwater harvesting network is in need of volumetric estimation of rainfall-runoff contribu... more The rainwater harvesting network is in need of volumetric estimation of rainfall-runoff contributed torecharge of the aquifers. Regular reporting of high quality rainfall events and intensity is still a challengeto be addressed in Sri Lanka. A combination of Open Source Hardware (OSHW) and Free & Open Source Software (FOSS) is being used to created a royalty-free cheap raingauge design with full control of on-board data collection andstatistics. Actual state-of-development has gone through the generic weather station prototype delivery to Irrigation Department for tank management and is in testing phase. A local manufacturer has delivered an all-in-one integrated board based on the prototype provided. Local manufacture of the sensors (tipping-bucket and other wind sensors) is under experimentation.
Rice submergence is the condition by which the water level rises above the rice crop canopy. In g... more Rice submergence is the condition by which the water level rises above the rice crop canopy. In general, rice plant response to submergence is to elongate its shoots above the rising water level. This costs in energy and eventually has a direct impact in terms of reducing yields. A specific gene, called Sub1, when introgressed into popular rice varieties by Marker Assisted Back-crossing, nearly stops the natural elongation process and permits a given local rice variety to sustain submerged conditions for a generally recognized period of about 2 weeks. Plant breeders now look for well-identified and location-accurate submergence areas in order to disseminate such improved local rice varieties. Remote sensing is proposed to provide surface water maps at high temporal resolution, determining a percentage of occurrences of surface water for a given pixel. Occurrence is defined as the count of days of identified surface water within a given period, returned in a percentage on that period. Rice area maps and knowledge of crop calendars are proposed to add to the assessment of submergence prone areas in the Northeastern Thailand.
Despite being necessary for effective water
management, the assessment of an irrigation system
... more Despite being necessary for effective water
management, the assessment of an irrigation system
requires a large amount of input data for the estimation of
related parameters and indicators, which are seldom mea-
sured in a regular and reliable manner. In this work, spa-
tially distributed surface energy balance fluxes and
geographical information systems analysis of multiple
groundwater parameters were used to estimate water
availability, supply, and demand, in order to calculate
water-accounting indicators. This methodology was used to
evaluate the performance of an irrigation system in the Pinios river basin (Greece) at two selected years of high
and low water availability. Time series of archived satellite
images and groundwater measurements have been used for
past years to support comparative analyses, due to the
limited availability of actual water measurements. The
resulting maps from the proposed methodology show that
the performance of the irrigation system varied across
space and time due to differences in its characteristics and
changes in its operation, driven by fluctuation of water
availability and the response of stakeholders to water
depletion. Irrigation districts with unsustainable water
management were identified and, together with those with
slow and/or limited groundwater recharge, were brought to
the attention of water managers. The observed differences
in the system operation between the wet and dry years were
attributed not only to the hydrological conditions of each
year, but also to the changing behaviour of farmers and the
improvement actions of the water managers.
ABSTRACT Agricultural monitoring is necessary for efficient food security management at country l... more ABSTRACT Agricultural monitoring is necessary for efficient food security management at country level. The near real time monitoring or prediction on crop growth in terms of planting date, acreage, planting intensity, water stress, biomass, yield and etc. is important. It can contribute to better policymaking, timely countermeasures, optimization of water resources distributions, damage assessment and finally to food supply security and stable market.
Materials and methods Study area The Upper Pampanga River Integrated Irrigation System (UPRIIS) i... more Materials and methods Study area The Upper Pampanga River Integrated Irrigation System (UPRIIS) in Central Luzon (Fig. 1), Philippines, covers an area of 102,000 ha and is divided into four districts. It gets its water from a combination of various run-of-the-river flows and the Pantabangan reservoir. There is a dry season from November to April and a wet season from May to October. The average annual rainfall is about 1,900 mm, of which 90% falls in the wet season (Tabbal et al 2002).
ABSTRACT Satellite derived estimates of actual evapotranspiration over large areas has become pop... more ABSTRACT Satellite derived estimates of actual evapotranspiration over large areas has become popular in water balance studies since 1990. It is practically impossible to get well-distributed cloud free images over the entire cropping season from one sensor in the tropical countries like the Philippine. This limitation can be overcome with the combination of high-spatial resolution of Landsat, and Terra/Aster images with the high temporal resolution of Terra/Modis images in the tropical climate.
ABSTRACT Estimating agricultural water use is an issue of primary importance in the Mediterranean... more ABSTRACT Estimating agricultural water use is an issue of primary importance in the Mediterranean. At the same time, several advanced algorithms have been developed, which couple Earth Observation data in thermal, visible and near-infrared wavelengths with a few meteorological measurements to provide a close approximation to the actual water use.
This textbook aims at expanding basics of GIS programming for Vector, Database and Raster. It sho... more This textbook aims at expanding basics of GIS programming for Vector, Database and Raster. It should be taken as an overview more than an thorough material, and by no mean dealing with all of the subject. After going through this book, the reader will be able to have a basic knowledge of the technology available for GIS data programming, and a good practical hand on most common ways to investigate them.
Programming starter book for remote sensing raster processing. Includes full public domain code w... more Programming starter book for remote sensing raster processing. Includes full public domain code with explanations for GDAL API (C, python, OpenMP, MPI-C, CUDA, OpenCL, WxPython), C for GRASS GIS, pyGRASS and R (using raster package).
Monitoring of water and land objects enters a revolutionary age with the rise of ubiquitous remot... more Monitoring of water and land objects enters a revolutionary age with the rise of ubiquitous remote sensing and public access. Earth monitoring satellites permit detailed, descriptive, quantitative, holistic, standardized, global evaluation of the state of the Earth skin in a manner that our actual Earthen civilization has never been able to before. The water monitoring topics covered in this book include the remote sensing of open water bodies, wetlands and small lakes, snow depth and underwater seagrass, along with a variety of remote sensing techniques, platforms, and sensors. The Earth monitoring topics include geomorphology, land cover in arid climate, and disaster assessment after a tsunami. Finally, advanced topics of remote sensing covers atmosphere analysis with GNSS signals, earthquake visual monitoring, and fundamental analyses of laser reflectometry in the atmosphere medium.
Availability of rainfall time-series is limited in many parts of the World, and the continuity of... more Availability of rainfall time-series is limited in many parts of the World, and the continuity of such records is variable. This research endeavors to extend actual daily rainfall observations to ungauged areas, taking into account events of rainfall as well as cumulative total daily rainfall, over a period of 11 years. Results show that rainfall events histograms can be reconstructed, and that total cumulative rainfall is estimated with 85% accuracy, using a surrounding network of rain gauges at 30-50 Km of distance from the point of study. This research can strengthen various types of research and applications such as ungauged basins research, regional climate modeling, food security early warning systems, agricultural insurance systems, etc.
The rainwater harvesting network is in need of volumetric estimation of rainfall-runoff contribu... more The rainwater harvesting network is in need of volumetric estimation of rainfall-runoff contributed torecharge of the aquifers. Regular reporting of high quality rainfall events and intensity is still a challengeto be addressed in Sri Lanka. A combination of Open Source Hardware (OSHW) and Free & Open Source Software (FOSS) is being used to created a royalty-free cheap raingauge design with full control of on-board data collection andstatistics. Actual state-of-development has gone through the generic weather station prototype delivery to Irrigation Department for tank management and is in testing phase. A local manufacturer has delivered an all-in-one integrated board based on the prototype provided. Local manufacture of the sensors (tipping-bucket and other wind sensors) is under experimentation.
Rice submergence is the condition by which the water level rises above the rice crop canopy. In g... more Rice submergence is the condition by which the water level rises above the rice crop canopy. In general, rice plant response to submergence is to elongate its shoots above the rising water level. This costs in energy and eventually has a direct impact in terms of reducing yields. A specific gene, called Sub1, when introgressed into popular rice varieties by Marker Assisted Back-crossing, nearly stops the natural elongation process and permits a given local rice variety to sustain submerged conditions for a generally recognized period of about 2 weeks. Plant breeders now look for well-identified and location-accurate submergence areas in order to disseminate such improved local rice varieties. Remote sensing is proposed to provide surface water maps at high temporal resolution, determining a percentage of occurrences of surface water for a given pixel. Occurrence is defined as the count of days of identified surface water within a given period, returned in a percentage on that period. Rice area maps and knowledge of crop calendars are proposed to add to the assessment of submergence prone areas in the Northeastern Thailand.
Despite being necessary for effective water
management, the assessment of an irrigation system
... more Despite being necessary for effective water
management, the assessment of an irrigation system
requires a large amount of input data for the estimation of
related parameters and indicators, which are seldom mea-
sured in a regular and reliable manner. In this work, spa-
tially distributed surface energy balance fluxes and
geographical information systems analysis of multiple
groundwater parameters were used to estimate water
availability, supply, and demand, in order to calculate
water-accounting indicators. This methodology was used to
evaluate the performance of an irrigation system in the Pinios river basin (Greece) at two selected years of high
and low water availability. Time series of archived satellite
images and groundwater measurements have been used for
past years to support comparative analyses, due to the
limited availability of actual water measurements. The
resulting maps from the proposed methodology show that
the performance of the irrigation system varied across
space and time due to differences in its characteristics and
changes in its operation, driven by fluctuation of water
availability and the response of stakeholders to water
depletion. Irrigation districts with unsustainable water
management were identified and, together with those with
slow and/or limited groundwater recharge, were brought to
the attention of water managers. The observed differences
in the system operation between the wet and dry years were
attributed not only to the hydrological conditions of each
year, but also to the changing behaviour of farmers and the
improvement actions of the water managers.
ABSTRACT Agricultural monitoring is necessary for efficient food security management at country l... more ABSTRACT Agricultural monitoring is necessary for efficient food security management at country level. The near real time monitoring or prediction on crop growth in terms of planting date, acreage, planting intensity, water stress, biomass, yield and etc. is important. It can contribute to better policymaking, timely countermeasures, optimization of water resources distributions, damage assessment and finally to food supply security and stable market.
Materials and methods Study area The Upper Pampanga River Integrated Irrigation System (UPRIIS) i... more Materials and methods Study area The Upper Pampanga River Integrated Irrigation System (UPRIIS) in Central Luzon (Fig. 1), Philippines, covers an area of 102,000 ha and is divided into four districts. It gets its water from a combination of various run-of-the-river flows and the Pantabangan reservoir. There is a dry season from November to April and a wet season from May to October. The average annual rainfall is about 1,900 mm, of which 90% falls in the wet season (Tabbal et al 2002).
ABSTRACT Satellite derived estimates of actual evapotranspiration over large areas has become pop... more ABSTRACT Satellite derived estimates of actual evapotranspiration over large areas has become popular in water balance studies since 1990. It is practically impossible to get well-distributed cloud free images over the entire cropping season from one sensor in the tropical countries like the Philippine. This limitation can be overcome with the combination of high-spatial resolution of Landsat, and Terra/Aster images with the high temporal resolution of Terra/Modis images in the tropical climate.
ABSTRACT Estimating agricultural water use is an issue of primary importance in the Mediterranean... more ABSTRACT Estimating agricultural water use is an issue of primary importance in the Mediterranean. At the same time, several advanced algorithms have been developed, which couple Earth Observation data in thermal, visible and near-infrared wavelengths with a few meteorological measurements to provide a close approximation to the actual water use.
Titan (Saturn VI) is the largest of Saturn’s natural satellites, it is a cold rocky moon with a v... more Titan (Saturn VI) is the largest of Saturn’s natural satellites, it is a cold rocky moon with a visible cloudy atmosphere, about 1.5 times the diameter of the Moon and 80% more massive. It has a high content of surface and atmospheric hydrocarbon hovering around their triple phase temperature range (solid, liquid, gas).
Though most probably the hydrocarbon is methane (CH4 ) of solar system origins [25] & [21], [9] considers that some of their analysis has found ethane (C2 H6) rainfall, confirming early work by [20] from the Voyager 1 radio occultation experiment. Thus the naming used in this study for the cycle of hydrocarbons is (m)ethanological.
More generic, [8] considers the dynamics and cycling of hydrocarbons on Titan to be ”Titan’s alkanology”.
Titan (Saturn VI) is the largest of Saturn’s natural satellites, it is a cold rocky moon with a v... more Titan (Saturn VI) is the largest of Saturn’s natural satellites, it is a cold rocky moon with a visible cloudy atmosphere, about 1.5 times the diameter of the Moon and 80% more massive. It has a high content of surface and atmospheric hydrocarbon hovering around their triple phase temperature range (solid, liquid, gas).
Though most probably the hydrocarbon is methane (CH4 ) of solar system origins [25] & [21], [9] considers that some of their analysis has found ethane (C2 H6) rainfall, confirming early work by [20] from the Voyager 1 radio occultation experiment. Thus the naming used in this study for the cycle of hydrocarbons is (m)ethanological.
More generic, [8] considers the dynamics and cycling of hydrocarbons on Titan to be ”Titan’s alkanology”.
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Papers by Yann Chemin
management, the assessment of an irrigation system
requires a large amount of input data for the estimation of
related parameters and indicators, which are seldom mea-
sured in a regular and reliable manner. In this work, spa-
tially distributed surface energy balance fluxes and
geographical information systems analysis of multiple
groundwater parameters were used to estimate water
availability, supply, and demand, in order to calculate
water-accounting indicators. This methodology was used to
evaluate the performance of an irrigation system in the Pinios river basin (Greece) at two selected years of high
and low water availability. Time series of archived satellite
images and groundwater measurements have been used for
past years to support comparative analyses, due to the
limited availability of actual water measurements. The
resulting maps from the proposed methodology show that
the performance of the irrigation system varied across
space and time due to differences in its characteristics and
changes in its operation, driven by fluctuation of water
availability and the response of stakeholders to water
depletion. Irrigation districts with unsustainable water
management were identified and, together with those with
slow and/or limited groundwater recharge, were brought to
the attention of water managers. The observed differences
in the system operation between the wet and dry years were
attributed not only to the hydrological conditions of each
year, but also to the changing behaviour of farmers and the
improvement actions of the water managers.
3rd edition full colour code highlighting.
management, the assessment of an irrigation system
requires a large amount of input data for the estimation of
related parameters and indicators, which are seldom mea-
sured in a regular and reliable manner. In this work, spa-
tially distributed surface energy balance fluxes and
geographical information systems analysis of multiple
groundwater parameters were used to estimate water
availability, supply, and demand, in order to calculate
water-accounting indicators. This methodology was used to
evaluate the performance of an irrigation system in the Pinios river basin (Greece) at two selected years of high
and low water availability. Time series of archived satellite
images and groundwater measurements have been used for
past years to support comparative analyses, due to the
limited availability of actual water measurements. The
resulting maps from the proposed methodology show that
the performance of the irrigation system varied across
space and time due to differences in its characteristics and
changes in its operation, driven by fluctuation of water
availability and the response of stakeholders to water
depletion. Irrigation districts with unsustainable water
management were identified and, together with those with
slow and/or limited groundwater recharge, were brought to
the attention of water managers. The observed differences
in the system operation between the wet and dry years were
attributed not only to the hydrological conditions of each
year, but also to the changing behaviour of farmers and the
improvement actions of the water managers.
surface and atmospheric hydrocarbon hovering around their triple phase temperature range (solid, liquid, gas).
Though most probably the hydrocarbon is methane (CH4 ) of solar system origins [25] & [21], [9] considers that some of their analysis has found ethane (C2 H6) rainfall, confirming early work by [20] from the Voyager 1 radio occultation experiment. Thus the naming used in this study for the cycle of hydrocarbons is (m)ethanological.
More generic, [8] considers the dynamics and cycling of hydrocarbons on Titan to be ”Titan’s alkanology”.
Though most probably the hydrocarbon is methane (CH4 ) of solar system origins [25] & [21], [9] considers that some of their analysis has found ethane (C2 H6) rainfall, confirming early work by [20] from the Voyager 1 radio occultation experiment. Thus the naming used in this study for the cycle of hydrocarbons is (m)ethanological.
More generic, [8] considers the dynamics and cycling of hydrocarbons on Titan to be ”Titan’s alkanology”.