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Extracting values from geospatial covariates to GPS points. [message #28869]

Wed, 20 March 2024 09:23

geoK
Messages: 56
Registered: May 2014

Senior Member

Hi, I have been using DHS GPS points in the past, and used buffers around the points when extracting values from geospatial covariates (2km if urban cluster, 5km buffer if rural cluster). Now I have come across this paper https://spatialdata.dhsprogram.com/references/DHS_Covariates _Extract_Data_Description_3.pdf and I was wondering if the overall guidelines on extraction are moving away from the buffers method to extracting to the actual point (although displaced)? Many thanks!

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Re: Extracting values from geospatial covariates to GPS points. [message #28880 is a reply to message #28869]

Thu, 21 March 2024 11:56

Ben-DHS
Messages: 4
Registered: February 2021

Member

Hi geoK

We are not moving away from the buffer method. When we began our geospatial modeling work, we modified the covariate extraction process to obtain direct point pixel values from the resampled/aggregated 5x5km layers. We are switching back to the buffer approach in the next version of our covariate manual, which we expect will be released this year.

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