Using Google Earth to Assess Shade for Sun Protection in Urban Recreation Spaces: Methods and Results
Shade in public spaces can lower the risk of and sun burning and skin cancer. However, existing methods of auditing shade require travel between sites, and sunny weather conditions. This study aimed to evaluate the feasibility of free computer software—Google Earth—for assessing shade in urban open spaces. A shade projection method was developed that uses Google Earth street view and aerial images to estimate shade at solar noon on the summer solstice, irrespective of the date of image capture. Three researchers used the method to separately estimate shade cover over pre-defined activity areas in a sample of 45 New Zealand urban open spaces, including 24 playgrounds, 12 beaches and 9 outdoor pools. Outcome measures included method accuracy (assessed by comparison with a subsample of field observations of 10 of the settings) and inter-rater reliability. Of the 164 activity areas identified in the 45 settings, most (83%) had no shade cover. The method identified most activity areas in playgrounds (85%) and beaches (93%) and was accurate for assessing shade over these areas (predictive values of 100%). Only 8% of activity areas at outdoor pools were identified, due to a lack of street view images. Reliability for shade cover estimates was excellent (intraclass correlation coefficient of 0.97, 95% CI 0.97–0.98). Google Earth appears to be a reasonably accurate and reliable and shade audit tool for playgrounds and beaches. The findings are relevant for programmes focused on supporting the development of healthy urban open spaces.
KeywordsSun protection Urban open space Outdoor recreation Skin cancer Google Earth Shade
This work was funded by the Cancer Society of New Zealand, Wellington Division. The funder had no role in the study design; collection, analysis and reporting of data; writing the report; or the decision to submit the report for publication.
Compliance with Ethical Standards
Conflict of interest
The authors declare no conflicts of interests.
- 1.Anderson, C., Jackson, K., Egger, S., Chapman, K., & Rock, V. (2014). Shade in urban playgrounds in Sydney and inequities in availability for those living in lower socioeconomic areas. Australian and New Zealand Journal of Public Health, 38(1), 49–53. https://doi.org/10.1111/1753-6405.12130.CrossRefPubMedGoogle Scholar
- 6.Gage, R., O’Toole, C., Robinson, A., Reeder, A., Signal, L., & Mackay, C. (2018). Wellington playgrounds uncovered: An examination of solar ultraviolet radiation and shade protection in New Zealand. Photochemistry and Photobiology, 94(2), 357–361. https://doi.org/10.1111/php.12855.CrossRefPubMedGoogle Scholar
- 8.Gartland, D., & Dobbinson, S. (2004). The sun protection environment at swimming pools in Victoria, 2000–2001. Retrieved from Melbourne https://www.cancervic.org.au/downloads/cbrc_research_papers/skin_cancer_research/SE7_ch11.pdf.
- 9.Greenwood, J., Soulos, G., & Thomas, N. (2000). Under cover: Guidelines for shade planning and design. Retrieved from Wellington https://cancernz.org.nz/assets/Sunsmart/Sunsmart-resources/Guidelines-Under-Cover.pdf.
- 10.Health Promotion Agency and Melanoma Network of New Zealand. (2017). New Zealand skin cancer primary prevention and early detection strategy 2017 to 2022. Retrieved from https://www.sunsmart.org.nz//sites/default/files/documents/FINAL-Strategy-2017-to-2022.PDF.
- 17.Schootman, M., Nelson, E. J., Werner, K., Shacham, E., Elliott, M., Ratnapradipa, K., et al. (2016). Emerging technologies to measure neighborhood conditions in public health: Implications for interventions and next steps. International Journal of Health Geographics, 15(1), 20. https://doi.org/10.1186/s12942-016-0050-z.CrossRefPubMedPubMedCentralGoogle Scholar
- 18.Volker, S., & Kistemann, T. (2011). The impact of blue space on human health and well-being—Salutogenetic health effects of inland surface waters: A review. International Journal of Hygiene and Environmental Health, 214(6), 449–460. https://doi.org/10.1016/j.ijheh.2011.05.001.CrossRefPubMedGoogle Scholar
- 19.Wellington City Council. (2016). A summary of the Wellington draft play spaces policy. Retrieved from https://wellington.govt.nz/~/media/have-your-say/public-input/files/consultations/2016/10-play-space/play-space-policy-consultation-summary-01-j001979.pdf?la=en.
- 20.Wilson, N., Pearson, A. L., Thomson, G., & Edwards, R. (2017). Actual and potential use of Google Street view for studying tobacco issues: A brief review. Tobacco Control. https://doi.org/10.1136/tobaccocontrol-2017-053723.CrossRefPubMedGoogle Scholar
- 21.World Health Organization. (1986). The Ottawa charter for health promotion. Retrieved from Switzerland http://www.who.int/healthpromotion/conferences/previous/ottawa/en/index.html.
- 22.World Health Organization. (2017). Skin cancers. Retrieved from Switzerland http://www.who.int/uv/faq/skincancer/en/index1.html.