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Quantifying the within-field heterogeneity or variability in agriculture

Table des matières Why use indicators of spatial variabilityWhat are the main index in the literatureWhat to watch out for before using these indicatorsData diversityLes caractéristiques des indicateurs de variabilité spatialeVers une utilisation conjointe et réfléchie des indices There is no such thing as a perfectly homogenous agricultural field ! And this is simply due Read more about Quantifying the within-field heterogeneity or variability in agriculture[…]

Reflecting on the carbon footprint of digital technologies in the AgTech and Precision Agriculture sectors

Table des matières Global warming in a few wordsGlobal climate changeA few degrees warmer, what difference does it make?Growth and CO2It’s all about energyThe carbon footprint of agricultureMineral nitrogen fertilizersEnergy consumption of agricultural machineryThe livestock sectorRice growingLand use changeSome additional informationWhat about digital agriculture in all this?A first point on the carbon footprint of digital Read more about Reflecting on the carbon footprint of digital technologies in the AgTech and Precision Agriculture sectors[…]

Geo-positioning in agriculture

Table des matières The constellations of navigation satellitesWhat do the satellites transmit to us?Sources of positioning errorDifferential correctionsSBAS – Satellite-based augmentation systemsEGNOS and global cousinsAgriculture-oriented SBASLBAS – Local-based augmentation systemsRTKnRTK: RTK networksPPKPPPPPP-RTKSome additional information on differential correctionsSelf-steering vs. Assisted SteeringUses of positioning in agricultureElements of conclusionSome diagrams and summary graphsSome interesting references As you are Read more about Geo-positioning in agriculture[…]

Linear modelling of spatial data in R

We will work here on a dataset that is fairly well known in spatial analysis – the “meuse” dataset – in order to reintroduce a number of concepts to those who would like to engage in linear modelling of spatialized data. This case study will be treated under the R language. One of the big Read more about Linear modelling of spatial data in R[…]

Coordinate reference systems

Table des matières GeoidEllipsoidsCartesian coordinatesGeodetic and geocentric coordinatesNon-projected and projected coordinatesWGS84 and Lambert 93 If there is one subject that is neglected when working with spatialized data, it is the reference coordinate system. In general, we try to spend as little time as possible on the subject – often because it’s not very clear – Read more about Coordinate reference systems[…]

How to generate spatially correlated data?

Table des matières Presentation of the method for generating cross-correlated spatial dataTheory of the methodLet’s first work on the proportion of noise for .Let us then work on the correlation between and Some little extras Generally speaking, when we want to evaluate the robustness and/or generality of an algorithm, we need to test it on Read more about How to generate spatially correlated data?[…]

Working with high-resolution data in precision agriculture

Table des matières Autocorrelation / Cross-correlationNoiseNoise and autocorrelationReliabily and data qualityA few words of conclusion Precision Agriculture is a data-based discipline; data that is collected to measure, describe, quantify, understand, or analyze agrosystems. A wide variety of measurement systems have been developed to measure agronomic parameters of interest, from plant vegetation status to crop yield, Read more about Working with high-resolution data in precision agriculture[…]

Producing profitability maps from yield maps?

Table des matières Yield and Profitability MapsHow do we value these profitability maps?What is the impact on value chain relationships?What are the limits to the use of profitability maps? In spite of the emulation around precision agriculture and digital agriculture in France, it is clear that these tools and solutions are not yet widespread in Read more about Producing profitability maps from yield maps?[…]

Filtering – Cleaning Yield Maps

Table des matières Why filter yield maps ?Typology of yield errorsSome additional elements In the previous post, a fairly general picture of yield sensors and associated data was drawn. Here we return to a recurring question related to yield data: How can we ensure that yield data are reliable enough to be used properly? We will Read more about Filtering – Cleaning Yield Maps[…]

Yield maps in Precision Agriculture

Table des matières Yield monitors: one of the pioneer sources of PAAcquisition  of  within-field  yield  data:  combine  harvesters  and  yield monitorsCharacteristics of within-field dataProvision and usagesAdvantages and limits of within-field yield dataHow to valorize yield maps?One last criticism for manufacturers. This post should have been published a long time ago, especially since it was the Read more about Yield maps in Precision Agriculture[…]