Spatially explicit global gross domestic product (GDP) data 
set consistent with the Shared Socioeconomic Pathways

Wang, Tingting; Sun, Fubao

doi:https://doi.org/10.5194/essd-2021-10

Preprints

https://doi.org/10.5194/essd-2021-10

Preprints

26 Jan 2021

Review status: this preprint was under review for the journal ESSD but the revision was not accepted.

Spatially explicit global gross domestic product (GDP) data set consistent with the Shared Socioeconomic Pathways

Tingting Wang¹ and Fubao Sun^1,2,3,4 Tingting Wang and Fubao Sun Tingting Wang¹ and Fubao Sun^1,2,3,4

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¹Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
²State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
³Akesu National Station of Observation and Research for Oasis Agro-ecosystem, Akesu, China
⁴College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China

Received: 12 Jan 2021 – Accepted for review: 24 Jan 2021 – Discussion started: 26 Jan 2021

Abstract. The increasing demand of ScenarioMIP is calling for GDP projections of high resolution for the future Shared Socioeconomic Pathways (SSPs) in both socioeconomic development and in climate change of adaption and mitigation research. While to date the global GDP projections for five SSPs are mainly provided at national scales, and the gridded data set are very limited. Meanwhile, the historical GDP can be disaggregated using nighttime light (NTL) images but the results are not open accessed, making it cumbersome in climate change impact and socioeconomic risk assessments across research disciplines. To this end, we produce a set of spatially explicit global Gross Domestic Product (GDP) that presents substantial long-term changes of economic activities for both historical period (2005 as representative) and for future projections under all five SSPs with a spatial resolution of 30 arc-seconds. Chinese population in SSP database were first replaced by the projections under the two-children policy implemented since 2016 and then used to spatialize global GDP using NTL images and gridded population together as fixed base map, which outperformed at subnational scales. The GDP data are consistent with projections from the SSPs and are freely available at http://doi.org/10.5281/zenodo.4350027 (Wang and Sun, 2020). We also provide another set of spatially explicit GDP using the global LandScan population as fixed base map, which is recommended at county or even smaller scales where NTL images are limited. Our results highlight the necessity and availability of using gridded GDP projections with high resolution for scenario-based climate change research and socioeconomic development that are consistent with all five SSPs.

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Tingting Wang and Fubao Sun

Status: closed

RC1:
'Comment on essd-2021-10', Anonymous Referee #1, 02 Mar 2021

In this article, the authors have produced a set of spatially explicit global GDP based on SSP scenarios. This could be an interesting publication if the authors can improve the novelty of this approach. The authors can also improve the paper in many other ways. First of all, the authors could provide a better introduction for SSP. For example, what are the five SSP scenarios and why they are significant. In addition, the organization could also be imporved. The authors have discusses different terms and policies, but there is a very poor transition between paragraphs. In addition, there is a lack of novelty for the method. Furthremore, the authors need to check the writing and grammar. For example, in the abstract, "ScenarioMIP" is not explained; line 120 - "with other auxiliary information but are not open accessed."; Line 133 - you used "population count (density)" and in line 158 you separated the terms "population count, population density", any significance?; Line 846 - are the 846 RMSE(s).

Citation: https://doi.org/10.5194/essd-2021-10-RC1
- AC1: 'Reply on RC1', Tingting Wang, 27 May 2021
  
  Thank you for all the helpful comments that improved our manuscript. We have reproduced this GDP data set and almost rewritten the whole manuscript. The changes being made are marked in revised version in the manuscript.
  First, the novelty of this data set has been stressed across the manuscript, and a detailed description of SSP has been provided in section 2.4.
  The structure has been largely improved, and we put more attention on the transition between paragraphs. In detail, the descriptions of 4 gridded population data sets except the LandScan population data set, and their evaluations on population estimation at various spatial scales have been moved to supporting online material. Other irrelevant material has been removed from this manuscript. On the other hand, we added several sections, including evaluation of different approaches in GDP disaggregation in section 3.4 and a more detailed description on GDP and GRP in section 2.3. The discussion has been largely improved as well. Please see the revised manuscript and we won’t elaborate here.
  The novelty of newly reproduced GCP data set lies in the superiority of methodology of LitPop approach, and the official GRP (394 OECD large (TL2) regions from 36 countries, and over 5000 counties in USA and China) figures used in GCP production at a high spatial resolution of 1km, which can further improve the accuracy of GCP data set. The improved version of LitPop approach, which combines NTL images and LandScan population in GDP disaggregation, helps reduce the shortages of saturation problem in NTL images and the precondition of even GDP per capita within an administrative boundary in gridded population data set when using either alone. The evaluation in section 3.4 further proves the superiority in higher accuracy in GDP disaggregation at a smaller scale. The limitation of LitPop approach has been discussed in section 6.
  Besides, we have corrected some mistakes (incorrect GDP and GRP figures) and reproduced this GCP data set.
  Other minor mistakes, e.g., full name of "ScenarioMIP" in the abstract, grammar mistakes as mentioned, have been corrected.
  Last but not least, thank you again for all the help in improving our manuscript.
  
  Citation: https://doi.org/10.5194/essd-2021-10-AC1
RC2:
'Comment on essd-2021-10', Anonymous Referee #2, 21 Apr 2021
Review report for manuscript „Spatially explicit global gross domestic product (GDP) data set consistent with the Shared Socioeconomic Pathways“ by Wang and Sun

The present manuscript provides and describes a global dataset of national GDP data according to the SSPs downscaled to a resolution of 1km. The methodology to conduct this downscaling is very similar to already available approaches, without providing a comprehensive description and a rigorous assessment of issues, loopholes and uncertainties. I started out reading enthusiastically but more and more learned that this dataset and the very general description thereof does not provide a timely and novel contribution to the field and for ESSD. I do agree that provision of thoroughly downscaled “lit-pop” SSP GDP data can be relevant for people working in the field but I do not think that the present dataset provides more answers then questions. For example, the authors question the approach by Murakami and Yamagata (2019), which very thoroughly describe their downscaling procedure and limitations, but then fail to provide any methodological advancement. I started collecting major and minor comments while going through the document until I lost motivation towards the end, see below. In summary, novelty is missing, the methodology is faulty and unconvincing, the description and discussion incomplete, uncertainty assessment is missing, English language needs thorough corrections, legibility of figures needs to be improved.

Major Comments

Title: The authors name their data spatially explicit gross domestic product (GDP), which is very colloquial and misleading as GDP usually refers to the output per country and not per cell. Consider using gross cell product instead.

Introduction: The introduction is not very well structured and needs revision: E.g. lines 84-88 appear very unconnected to the preceding paragraphs, as are lines 98-102.

Line 74-75: The authors should cite and refer to this recent paper, which is an global extension of Zhao et al 2017 and covers large parts of the methodological work presented in the current manuscript in much more detail: Eberenz, S., Stocker, D., Röösli, T., and Bresch, D. N.: Asset exposure data for global physical risk assessment, Earth Syst. Sci. Data, 12, 817–833, https://doi.org/10.5194/essd-12-817-2020, 2020.

Line 94-95, line 317-334: Murakami and Yamagata downscaled SSP1-3 only for a specific reason: They found their very elaborate methodology to be too uncertain to be applied to SSP4-5. In the current manuscript I am missing a thorough discussion of related uncertainties.

Line 118-120: This statement about missing open access availability is not true. There are various freely available sources for gridded historical and/or future GDP data, e.g. Eberenz et al 2020, Geiger et al (2017), Kummu et al (2018).

Section 2 (starting from line 131) is a presentation of various data sources without any introduction whatsoever. It would clearly be helpful for the reader to provide an initial paragraph motivating the description and the use of the different data sources in the context of the study.

Section 2.2.1 (starting from line 205) is very confusing and it remains totally unclear why the concept of the ICP or PPP rates are introduced. This, however, is a very relevant point fundamental for the whole study! SSP data is provided in units of 2005 PPP USD (to allow for global intercomparison of national numbers) but most other data is not (or not anymore) (E.g., Worldbank GDP data in 2005 PPP USD was withdrawn and I don’t expect sub-national GDP data to be available in PPP-adjusted values). Please see Geiger (2018) and references therein for a thorough description of this issue. I expect the authors to describe in clear language including references to data sources how they tackled the problem of data conversion step by step. It’s not a simple issue and faulty data might be the result. This comment also applies to Section 3.1.

Section 2.3.2 (starting from line 301): SEDAC for a couple of years already provides downscaled SSP population projections at 1km scale (https://sedac.ciesin.columbia.edu/data/set/popdynamics-1-km-downscaled-pop-base-year-projection-ssp-2000-2100-rev01). These data are not mentioned neither applied in the current manuscript and could significantly improve the results provided.

Line 317-334: A revised version of the Murakami data was provided at 1/8° resolution (using the Jones and O’Neill 2016 population data as input) here: Geiger, Tobias; Daisuke, Murakami; Frieler, Katja; Yamagata, Yoshiki (2017): Spatially-explicit Gross Cell Product (GCP) time series: past observations (1850-2000) harmonized with future projections according to the Shared Socioeconomic Pathways (2010-2100). GFZ Data Services. https://doi.org/10.5880/pik.2017.007. This reference should be cited in the manuscript. RELATE TO THIS POINT LATER on doubts of data quality.

Section 2.3.4 (starting from line 335): It’s worthwhile to acknowledge how policy changes can affect the projections and I agree that China’s policy change regarding the two-children policy will have significant impacts. But I doubt that deliberately replacing the GDP estimates for one country only provide an improvement for a globally-consistent and dynamically-modelled dataset. On the contrary, China’s economy is globally interconnected and simply adjusting China’s output by as much as 40% will misrepresent the interaction with all other countries. There are two solutions: 1) stick with the original data provided or 2) wait for a new update of globally-consistent GDP projections that do not only include policy changes in China but similar changes across the globe including past economic crises and the Covid-19 pandemic.

Section 3.1.: I see many different data sources being used and reshuffled to obtain GDP per capita estimates. Relating to my major comment 8), I doubt that all GDP sources can be easily transferred between different units (in particular sub-national estimates used here). I further miss a thorough consistency check of GDP and population data from different sources, including strange and un-referenced sources like the Wire & Plastic Products Group. Differences between different sources can be quite significant (e.g. because of different and/or changing assumptions on country shapes, …) and erroneous estimates of GDP per capita are the result. These issues are discussed for gridded population (Section 3.2.1) but totally neglected for national estimates here.

Line 412-414: I find it quite strange to use a county-level analysis for China only to judge on a global population dataset quality. When using Fig S1 one would reject LandScan based on its largest RMSE contribution.

Eq 3: This approach is very general and does not refer to nor tests recent advancements in the field, see Eberenz et al (2020).

Figure 2: I would be curious to see how the methodology applies to the U.S. or China alone instead of mixing up those countries. I would also strongly suggest to estimate the quality of the downscaling using log-transformed data. It seems in Fig 2c that the results are dominated by a few counties with largest GDP and not by the bulk of data.

Section 3.4: The discussion is very general, not convincing and does not provide strong evidence to believe in the methodology presented. Again using only evidence from China and the U.S. for a global study provides very limited evidence, without discussing these limitations at all.

Line 508: See major comment 9.

Line 510: This assumption is very strong for a period of about 80 years and could be overcome by either using the available downscaled SSP population data on 1km or by using more advanced refinements, as e.g. presented by Murakami and Yamagata 2019.

Minor comments

Line 24: Definition ScenarioMIP missing

Line 28-31: This sentence is unclear and does not provide insights. What is not available open access?

Line 66: Reference Tobias 2018 should be corrected to read Geiger 2018

Line 78: What are DN values? Please specify!

Line 95-98: I don’t understand what the authors want to imply with this sentence.

Line 114: What gives rise to the range of projected GDP changes in China? Please specify!

Line 377: Please provide reference to Wire & Plastic Products Group data sources.

Line 395: Please specify and reference which GIS-based boundaries were used in this study as this choice may have strong implications for the provided data.

Eq 3: The subscript lit-pop and NTL-Pop are used simultaneously, please correct.
Citation: https://doi.org/10.5194/essd-2021-10-RC2
- AC2: 'Reply on RC2', Tingting Wang, 27 May 2021
  
  The authors are really grateful for all the helpful and constructive comments. We feel embarrassed about the mistakes we made, and take each comment seriously. Each comment has been carefully addressed in the revised version.
  We first correct the mistake of using GDP in current PPP USD from World Bank in GDP disaggregation in 2005. National GDP from Geiger et al. (2017) and GRP (394 OECD large (TL2) regions from 36 OECD countries, plus state and county values in USA and China after rescaling from current PPP USD to 2005 PPP USD) were obtained and used in GDP disaggregation.
  The improved methodology of LitPop approach (Eberenz et al.,2020) has been adopted and evaluated in GDP disaggregation. A comprehensive description of method is provided in section 3.3, and a rigorous assessment of disaggregation skill, uncertainties is in section 3.4. The advantage has been elaborated in the manuscript and limitations are discussed in section 6.
  The original section of describing GCP data set developed by Murakami and Yamagata (2019) was removed since it is not been used before and in the new version of GCP.
  Detailed point to point response is presented in supplement file.
  
  Citation: https://doi.org/10.5194/essd-2021-10-AC2

Status: closed

RC1:
'Comment on essd-2021-10', Anonymous Referee #1, 02 Mar 2021

In this article, the authors have produced a set of spatially explicit global GDP based on SSP scenarios. This could be an interesting publication if the authors can improve the novelty of this approach. The authors can also improve the paper in many other ways. First of all, the authors could provide a better introduction for SSP. For example, what are the five SSP scenarios and why they are significant. In addition, the organization could also be imporved. The authors have discusses different terms and policies, but there is a very poor transition between paragraphs. In addition, there is a lack of novelty for the method. Furthremore, the authors need to check the writing and grammar. For example, in the abstract, "ScenarioMIP" is not explained; line 120 - "with other auxiliary information but are not open accessed."; Line 133 - you used "population count (density)" and in line 158 you separated the terms "population count, population density", any significance?; Line 846 - are the 846 RMSE(s).

Citation: https://doi.org/10.5194/essd-2021-10-RC1
- AC1: 'Reply on RC1', Tingting Wang, 27 May 2021
  
  Thank you for all the helpful comments that improved our manuscript. We have reproduced this GDP data set and almost rewritten the whole manuscript. The changes being made are marked in revised version in the manuscript.
  First, the novelty of this data set has been stressed across the manuscript, and a detailed description of SSP has been provided in section 2.4.
  The structure has been largely improved, and we put more attention on the transition between paragraphs. In detail, the descriptions of 4 gridded population data sets except the LandScan population data set, and their evaluations on population estimation at various spatial scales have been moved to supporting online material. Other irrelevant material has been removed from this manuscript. On the other hand, we added several sections, including evaluation of different approaches in GDP disaggregation in section 3.4 and a more detailed description on GDP and GRP in section 2.3. The discussion has been largely improved as well. Please see the revised manuscript and we won’t elaborate here.
  The novelty of newly reproduced GCP data set lies in the superiority of methodology of LitPop approach, and the official GRP (394 OECD large (TL2) regions from 36 countries, and over 5000 counties in USA and China) figures used in GCP production at a high spatial resolution of 1km, which can further improve the accuracy of GCP data set. The improved version of LitPop approach, which combines NTL images and LandScan population in GDP disaggregation, helps reduce the shortages of saturation problem in NTL images and the precondition of even GDP per capita within an administrative boundary in gridded population data set when using either alone. The evaluation in section 3.4 further proves the superiority in higher accuracy in GDP disaggregation at a smaller scale. The limitation of LitPop approach has been discussed in section 6.
  Besides, we have corrected some mistakes (incorrect GDP and GRP figures) and reproduced this GCP data set.
  Other minor mistakes, e.g., full name of "ScenarioMIP" in the abstract, grammar mistakes as mentioned, have been corrected.
  Last but not least, thank you again for all the help in improving our manuscript.
  
  Citation: https://doi.org/10.5194/essd-2021-10-AC1
RC2:
'Comment on essd-2021-10', Anonymous Referee #2, 21 Apr 2021
Review report for manuscript „Spatially explicit global gross domestic product (GDP) data set consistent with the Shared Socioeconomic Pathways“ by Wang and Sun

The present manuscript provides and describes a global dataset of national GDP data according to the SSPs downscaled to a resolution of 1km. The methodology to conduct this downscaling is very similar to already available approaches, without providing a comprehensive description and a rigorous assessment of issues, loopholes and uncertainties. I started out reading enthusiastically but more and more learned that this dataset and the very general description thereof does not provide a timely and novel contribution to the field and for ESSD. I do agree that provision of thoroughly downscaled “lit-pop” SSP GDP data can be relevant for people working in the field but I do not think that the present dataset provides more answers then questions. For example, the authors question the approach by Murakami and Yamagata (2019), which very thoroughly describe their downscaling procedure and limitations, but then fail to provide any methodological advancement. I started collecting major and minor comments while going through the document until I lost motivation towards the end, see below. In summary, novelty is missing, the methodology is faulty and unconvincing, the description and discussion incomplete, uncertainty assessment is missing, English language needs thorough corrections, legibility of figures needs to be improved.

Major Comments

Title: The authors name their data spatially explicit gross domestic product (GDP), which is very colloquial and misleading as GDP usually refers to the output per country and not per cell. Consider using gross cell product instead.

Introduction: The introduction is not very well structured and needs revision: E.g. lines 84-88 appear very unconnected to the preceding paragraphs, as are lines 98-102.

Line 74-75: The authors should cite and refer to this recent paper, which is an global extension of Zhao et al 2017 and covers large parts of the methodological work presented in the current manuscript in much more detail: Eberenz, S., Stocker, D., Röösli, T., and Bresch, D. N.: Asset exposure data for global physical risk assessment, Earth Syst. Sci. Data, 12, 817–833, https://doi.org/10.5194/essd-12-817-2020, 2020.

Line 94-95, line 317-334: Murakami and Yamagata downscaled SSP1-3 only for a specific reason: They found their very elaborate methodology to be too uncertain to be applied to SSP4-5. In the current manuscript I am missing a thorough discussion of related uncertainties.

Line 118-120: This statement about missing open access availability is not true. There are various freely available sources for gridded historical and/or future GDP data, e.g. Eberenz et al 2020, Geiger et al (2017), Kummu et al (2018).

Section 2 (starting from line 131) is a presentation of various data sources without any introduction whatsoever. It would clearly be helpful for the reader to provide an initial paragraph motivating the description and the use of the different data sources in the context of the study.

Section 2.2.1 (starting from line 205) is very confusing and it remains totally unclear why the concept of the ICP or PPP rates are introduced. This, however, is a very relevant point fundamental for the whole study! SSP data is provided in units of 2005 PPP USD (to allow for global intercomparison of national numbers) but most other data is not (or not anymore) (E.g., Worldbank GDP data in 2005 PPP USD was withdrawn and I don’t expect sub-national GDP data to be available in PPP-adjusted values). Please see Geiger (2018) and references therein for a thorough description of this issue. I expect the authors to describe in clear language including references to data sources how they tackled the problem of data conversion step by step. It’s not a simple issue and faulty data might be the result. This comment also applies to Section 3.1.

Section 2.3.2 (starting from line 301): SEDAC for a couple of years already provides downscaled SSP population projections at 1km scale (https://sedac.ciesin.columbia.edu/data/set/popdynamics-1-km-downscaled-pop-base-year-projection-ssp-2000-2100-rev01). These data are not mentioned neither applied in the current manuscript and could significantly improve the results provided.

Line 317-334: A revised version of the Murakami data was provided at 1/8° resolution (using the Jones and O’Neill 2016 population data as input) here: Geiger, Tobias; Daisuke, Murakami; Frieler, Katja; Yamagata, Yoshiki (2017): Spatially-explicit Gross Cell Product (GCP) time series: past observations (1850-2000) harmonized with future projections according to the Shared Socioeconomic Pathways (2010-2100). GFZ Data Services. https://doi.org/10.5880/pik.2017.007. This reference should be cited in the manuscript. RELATE TO THIS POINT LATER on doubts of data quality.

Section 2.3.4 (starting from line 335): It’s worthwhile to acknowledge how policy changes can affect the projections and I agree that China’s policy change regarding the two-children policy will have significant impacts. But I doubt that deliberately replacing the GDP estimates for one country only provide an improvement for a globally-consistent and dynamically-modelled dataset. On the contrary, China’s economy is globally interconnected and simply adjusting China’s output by as much as 40% will misrepresent the interaction with all other countries. There are two solutions: 1) stick with the original data provided or 2) wait for a new update of globally-consistent GDP projections that do not only include policy changes in China but similar changes across the globe including past economic crises and the Covid-19 pandemic.

Section 3.1.: I see many different data sources being used and reshuffled to obtain GDP per capita estimates. Relating to my major comment 8), I doubt that all GDP sources can be easily transferred between different units (in particular sub-national estimates used here). I further miss a thorough consistency check of GDP and population data from different sources, including strange and un-referenced sources like the Wire & Plastic Products Group. Differences between different sources can be quite significant (e.g. because of different and/or changing assumptions on country shapes, …) and erroneous estimates of GDP per capita are the result. These issues are discussed for gridded population (Section 3.2.1) but totally neglected for national estimates here.

Line 412-414: I find it quite strange to use a county-level analysis for China only to judge on a global population dataset quality. When using Fig S1 one would reject LandScan based on its largest RMSE contribution.

Eq 3: This approach is very general and does not refer to nor tests recent advancements in the field, see Eberenz et al (2020).

Figure 2: I would be curious to see how the methodology applies to the U.S. or China alone instead of mixing up those countries. I would also strongly suggest to estimate the quality of the downscaling using log-transformed data. It seems in Fig 2c that the results are dominated by a few counties with largest GDP and not by the bulk of data.

Section 3.4: The discussion is very general, not convincing and does not provide strong evidence to believe in the methodology presented. Again using only evidence from China and the U.S. for a global study provides very limited evidence, without discussing these limitations at all.

Line 508: See major comment 9.

Line 510: This assumption is very strong for a period of about 80 years and could be overcome by either using the available downscaled SSP population data on 1km or by using more advanced refinements, as e.g. presented by Murakami and Yamagata 2019.

Minor comments

Line 24: Definition ScenarioMIP missing

Line 28-31: This sentence is unclear and does not provide insights. What is not available open access?

Line 66: Reference Tobias 2018 should be corrected to read Geiger 2018

Line 78: What are DN values? Please specify!

Line 95-98: I don’t understand what the authors want to imply with this sentence.

Line 114: What gives rise to the range of projected GDP changes in China? Please specify!

Line 377: Please provide reference to Wire & Plastic Products Group data sources.

Line 395: Please specify and reference which GIS-based boundaries were used in this study as this choice may have strong implications for the provided data.

Eq 3: The subscript lit-pop and NTL-Pop are used simultaneously, please correct.
Citation: https://doi.org/10.5194/essd-2021-10-RC2
- AC2: 'Reply on RC2', Tingting Wang, 27 May 2021
  
  The authors are really grateful for all the helpful and constructive comments. We feel embarrassed about the mistakes we made, and take each comment seriously. Each comment has been carefully addressed in the revised version.
  We first correct the mistake of using GDP in current PPP USD from World Bank in GDP disaggregation in 2005. National GDP from Geiger et al. (2017) and GRP (394 OECD large (TL2) regions from 36 OECD countries, plus state and county values in USA and China after rescaling from current PPP USD to 2005 PPP USD) were obtained and used in GDP disaggregation.
  The improved methodology of LitPop approach (Eberenz et al.,2020) has been adopted and evaluated in GDP disaggregation. A comprehensive description of method is provided in section 3.3, and a rigorous assessment of disaggregation skill, uncertainties is in section 3.4. The advantage has been elaborated in the manuscript and limitations are discussed in section 6.
  The original section of describing GCP data set developed by Murakami and Yamagata (2019) was removed since it is not been used before and in the new version of GCP.
  Detailed point to point response is presented in supplement file.
  
  Citation: https://doi.org/10.5194/essd-2021-10-AC2

Tingting Wang and Fubao Sun

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https://doi.org/10.5194/essd-2021-10-supplement

Tingting Wang and Fubao Sun

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Short summary

We produce a set of spatially explicit global GDP with consideration of two-children policy in China that presents substantial long-term changes for both historical period and for future projections under five SSPs to face the increasing demand of ScenarioMIP of high resolution for future socioeconomic development and climate change of adaption and mitigation research.


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