Land Measurement Bias: Comparisons from Global Positioning System, Self-Reports, and Satellite Data

Abstract

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Participation in contract farming and farm performance: Insights from cashew farmers in Ghana

“…Even though the inverse relationship holds for very small farms (0–3 ha), farms between 20 and 70 ha are substantially more productive due to mechanization and reduced labor input per hectare. Moreover, the studies by Carletto, Gourlay, and Winters () and Dillon and Rao () show that self‐reported farm sizes, as in our case, can lead to land measurement bias. Small farmers tend to overestimate, whereas large farmers tend to underestimate their land sizes (Carletto et al., ).…”

“…input per hectare. Moreover, the studies by Carletto, Gourlay, and Winters (2015) and Dillon and Rao (2018) show that self-reported farm sizes, as in our case, can lead to land measurement bias. Small farmers tend to overestimate, whereas large farmers tend to underestimate their land sizes (Carletto et al, 2013).…”

8 - The Impact of Short Message Services (SMS) Weather Forecasts on Cost, Yield and Income in Maize Production: Evidence from a Pilot Randomised Controlled Trial in Bembèrèkè, North Benin

“…This is the total quantity of maize harvested per hectare of cultivated land. To be consistent with the studies by Dillon and Rao (2018) and Kilic et al (2018) on land size measurement error, we used Global Positioning System (GPS) to track and measure the land size of each respondent. This helped to avoid any misreporting problems that could lead to biased estimates.…”

Leveraging Technology and Innovation for Disaster Risk Management and Financing

“…In some cases, the additional risk insight has increased the availability of coverage (see Box 5.2) Earth observation imagery can play a critical role in monitoring cultivation and yields for the extension of agricultural insurance (Mcintosh and Mansini 2018), (Rotairo et al 2019), (ADB 2018b), either on a stand-alone basis or in combination with field survey data to address gaps in coverage (Guan et al 2018). One recent study found that the use of publicly available Google Earth imagery for measuring the size of cultivated land in the Lao People's Democratic Republic, the Philippines, Thailand, and Viet Nam provided sufficient accuracy to serve as a cost-effective alternative for validating self-reported information from farmers (Dillon and Rao 2018).…”