O slideshow foi denunciado.
Utilizamos seu perfil e dados de atividades no LinkedIn para personalizar e exibir anúncios mais relevantes. Altere suas preferências de anúncios quando desejar.

Satellite Yield Mapping in Kenya and Nepal

122 visualizações

Publicada em

Jake Campolo
Using Satellite Imagery for Early Warning of Productivity Constraints
Organized by the Food Security Portal (FSP)
OCT 31, 2019 - 11:00 AM TO 12:30 PM EDT

Publicada em: Governo e ONGs
  • Get Paid $25 per hour to watch YouTube videos ♥♥♥ http://t.cn/AieXiXbg
    Tem certeza que deseja  Sim  Não
    Insira sua mensagem aqui
  • Seja a primeira pessoa a gostar disto

Satellite Yield Mapping in Kenya and Nepal

  1. 1. Satellite yield mapping in Kenya and Nepal Understanding variability and informing crop management Jake Campolo - Lobell Lab - Stanford University
  2. 2. Maize yield mapping in Kenya and Tanzania ● Smallholder farms (< 5 ha) produce more than 50% of food calories ● Survey-based measurements are time and cost intensive ● Satellite-based measurements offer a scalable, flexible alternative while capturing fine-scale heterogeneity Jin et al., 2019
  3. 3. Crop classification
  4. 4. Overcoming remote sensing challenges... Challenges: ● Cloudy images ● Haze / atmospheric interference ● Missing observations
  5. 5. … via time series statistical fitting 0 1 2 3 4 Seasonal maximum of red-edge CI
  6. 6. Yield Estimation Model: Yield = 𝛽𝛽0 + 𝛽𝛽1 VI + 𝛽𝛽2 W ● VI = Seasonal max of the vegetation index ● W = relevant weather variables at site (temperature, precipitation, solar radiation, etc) Input data from (1) field + satellite data (2) crop simulation output Yield validation with cropcut data, 2016
  7. 7. Application of Yield Maps: Kenya Explore drivers of heterogeneity E.g. Combine with soil nutrient maps to assess the influence of soil properties on yields Jin et al., 2019
  8. 8. Application of Yield Maps: Nepal Non-linear effects of soil properties on yield How do these interact with fertilizer effectiveness? Provide precision soil- based recommendations for management ΔYield(kg/ha)