ISIMIP3a population input data

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Jan Volkholz, Stefan Lange, Tobias Geiger (2022): ISIMIP3a population input data (v1.1). ISIMIP Repository.


ISIMIP3a population input data
  • Jan Volkholz
  • Stefan Lange
  • Tobias Geiger
Contact person:
  • Jan Volkholz

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The Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) provides a framework for the collation of a consistent set of climate impact data across sectors and scales. It also provides a unique opportunity for considering interactions between climate change impacts across sectors through consistent scenarios.

The ISIMIP3a part of the third simulation round is dedicated to i) impact model evaluation and improvement and ii) detection and attribution of observed impacts according to the framework of IPCC AR5 Working Group II Chapter 18. To this end all simulations are driven by observed socio-economic information combined with either observed (factual) climate data or a detrended (counterfactual) version of the observed climate allowing for the generation of a “no climate change” baseline.

This dataset contains the national and gridded historical population data for ISIMIP3a. Estimates are available for total as well as urban and rural population counts.

With version 1.1, we provide gridded population data, that is based on HYDE v3.3 (private communication with K. Klein Goldewijk, to be published). Just like the original dataset we provide total, rural and urban population per grid cell.


The population data are adopted from HYDE v3.3 (private communication with K. Klein Goldewijk, to be published). Just like the original dataset we provide total, rural and urban population per grid cell. The original data was on a 1/12°×1/12° grid and has been interpolated to ISIMIP's 1/2°×1/2° grid via cdo remapcon. Furthermore, the map was modified to comply with the ISIMIP fractional land-sea-mask (Perrette 2022).

Before the year 2000 HYDE provides data every ten years, the intermediate years have been filled by linear interpolation. Also, the original HYDE data ends in 2020, so to cover the whole ISIMIP3a time frame the final year 2020 has been duplicated as 2021. This way annual coverage of 1850 to 2021 has been achieved.

All grid cells of a country, as defined by the ISIMIP fractional country map (Perrette 2022), have been rescaled such that the country's total population matches the numbers provided in the national population data (United Nations 2009). Since the national data only starts in 1950, all years prior to 1950 have been rescaled by the scaling factors of 1950.

Publication date:
May 23, 2022
ISIMIP Repository
  • Matthias Büchner
  • Jochen Klar
  • Iliusi Vega del Valle
  • Jan Volkholz
  • Jacob Schewe
  • Stefan Lange
  • Franziska Piontek
  • Christopher Reyer
  • Matthias Mengel
  • María del Rocío Rivas López
  • Christian Otto
  • Bjoern Soergel
  • Anne Gädeke
  • Martin Park
  • Barbara Templ
  • Katja Frieler
  • Potsdam Institute for Climate Impact Research

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