MAgPIE is a non-linear, recursive, dynamic-optimization, global land and water-use model with a cost-minimization objective function. MAgPIE was developed and is employed by the land-use group working at the Potsdam Institute for Climate Impact Research (PIK). It links regional economic information with grid-based biophysical constraints simulated by the dynamic vegetation and hydrology model LPJmL. MAgPIE considers spatially-explicit patterns of production, land use change and water constraints in different world regions, consistently linking economic development with food and energy demand. The Model The model is based on static yield functions in order to model potential crop productivity and its related water use. For the biophysical supply simulation, spatially explicit 0.5° data is aggregated to a consistent number of clusters. Ten world regions represent the demand side of the model. Required calories for the demand categories (food and non-food energy intake) are determined by a cross-sectional country regression based on population and income projections. In order to fulfill the demand, the model allocates 19 cropping and 5 livestock activities to the spatially-explicit land and water resources, subject to resource, management and cost constraints. From 1995 MAgPIE simulates time-steps of 10 years. For each period the optimal land use pattern from the previous period is used as a starting point. Demand The demand for agricultural products is fixed for every region and every time-step. The drivers of agricultural demand are: time, income and population growth. Total demand is composed of: food demand, material demand, feed demand and seed demand. Food demand depends on food energy demand, and the share of crop and livestock products in the diet. Within livestock products, the share of different products (Ruminant meat, chicken meat, other meat, milk, eggs) is fixed at 1995 levels. The same is valid for the share of crops within total food calories and material demand. The share of livestock products in the total consumed food calories is an important driver for the land-use sector. Different statistical models are used to estimate plausible future scenarios. A calibration is used to reach the livestock shares of the Food Balance Sheets for 1995 for each region.

From Wikipedia (CC BY-SA 4.0).

Notable quotes

“The room was a magpie-nest of picked-at knowledge, the lair of a tinkerer to whom the universe was one vast toyshop of intriguing side issues.”
— Barbara Hambly, Dragonsbane (1986), Chapter 2
“Invisible magpies warbled in the plane trees. Softly, gently, never running out of melodic ideas, they perched among the leaves and spun out their endless tales.”
— Helen Garner, Joe Cinque's Consolation (2004)
“The colour of the magpie, her father was saying, was symbolic of creation. The void, the mystery of that which had not yet taken form. Black and white, he said. Presence and absence.”
— Kate Mosse, The Taxidermist's Daughter (2014), Chapter 16
“A magpie can be happy or sad: sometimes so happy that he sits on a high, high gum tree and rolls the sunrise around in his throat like beads of pink sunlight; and sometimes so sad that you would expect the tears to drip off his beak. This magpie was like that.”
— Colin Thiele, Magpie Island (1974)

Quotes via Wikiquote (CC BY-SA), each with its original source.

Notable quotes

“The room was a magpie-nest of picked-at knowledge, the lair of a tinkerer to whom the universe was one vast toyshop of intriguing side issues.”
— Barbara Hambly, Dragonsbane (1986), Chapter 2
“Invisible magpies warbled in the plane trees. Softly, gently, never running out of melodic ideas, they perched among the leaves and spun out their endless tales.”
— Helen Garner, Joe Cinque's Consolation (2004)
“The colour of the magpie, her father was saying, was symbolic of creation. The void, the mystery of that which had not yet taken form. Black and white, he said. Presence and absence.”
— Kate Mosse, The Taxidermist's Daughter (2014), Chapter 16
“A magpie can be happy or sad: sometimes so happy that he sits on a high, high gum tree and rolls the sunrise around in his throat like beads of pink sunlight; and sometimes so sad that you would expect the tears to drip off his beak. This magpie was like that.”
— Colin Thiele, Magpie Island (1974)

Quotes via Wikiquote (CC BY-SA), each with its original source.

Not who you're looking for? Others named MAgPIE: polyphylyic group within the family Corvidae, consisting of · power generator · species of insect · 2024 film directed by Sam Yates

Overview

MAgPIE is a non-linear, recursive, dynamic-optimization, global land and water-use model with a cost-minimization objective function. MAgPIE was developed and is employed by the land-use group working at the Potsdam Institute for Climate Impact Research (PIK). It links regional economic information with grid-based biophysical constraints simulated by the dynamic vegetation and hydrology model LPJmL. MAgPIE considers spatially-explicit patterns of production, land use change and water constraints in different world regions, consistently linking economic development with food and energy demand. The Model The model is based on static yield functions in order to model potential crop productivity and its related water use. For the biophysical supply simulation, spatially explicit 0.5° data is aggregated to a consistent number of clusters. Ten world regions represent the demand side of the model. Required calories for the demand categories (food and non-food energy intake) are determined by a cross-sectional country regression based on population and income projections. In order to fulfill the demand, the model allocates 19 cropping and 5 livestock activities to the spatially-explicit land and water resources, subject to resource, management and cost constraints. From 1995 MAgPIE simulates time-steps of 10 years. For each period the optimal land use pattern from the previous period is used as a starting point. Demand The demand for agricultural products is fixed for every region and every time-step. The drivers of agricultural demand are: time, income and population growth. Total demand is composed of: food demand, material demand, feed demand and seed demand. Food demand depends on food energy demand, and the share of crop and livestock products in the diet. Within livestock products, the share of different products (Ruminant meat, chicken meat, other meat, milk, eggs) is fixed at 1995 levels. The same is valid for the share of crops within total food calories and material demand. The share of livestock products in the total consumed food calories is an important driver for the land-use sector. Different statistical models are used to estimate plausible future scenarios. A calibration is used to reach the livestock shares of the Food Balance Sheets for 1995 for each region.

From Wikipedia (CC BY-SA 4.0).

MAgPIE is a non-linear, recursive, dynamic-optimization, global land and water-use model with a cost-minimization objective function.

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