Error(s) in re-building vignettes:
--- re-building 'access_inequality.Rmd' using rmarkdown
Linking to GEOS 3.9.1, GDAL 3.2.1, PROJ 7.2.1; sf_use_s2() is TRUE
udunits database from D:/temp/RtmpsPWb0q/RLIBS_82b81f0f62f/units/share/udunits/udunits2.xml
SSL certificate problem: unable to get local issuer certificate
Problem connecting to data server. Please try aopdata again in a few minutes.
Quitting from lines 36-42 (access_inequality.Rmd) 
Error: processing vignette 'access_inequality.Rmd' failed with diagnostics:
SSL certificate problem: unable to get local issuer certificate
--- failed re-building 'access_inequality.Rmd'

--- re-building 'access_maps.Rmd' using rmarkdown
Linking to GEOS 3.9.1, GDAL 3.2.1, PROJ 7.2.1; sf_use_s2() is TRUE
SSL certificate problem: unable to get local issuer certificate
Problem connecting to data server. Please try aopdata again in a few minutes.
Quitting from lines 36-43 (access_maps.Rmd) 
Error: processing vignette 'access_maps.Rmd' failed with diagnostics:
SSL certificate problem: unable to get local issuer certificate
--- failed re-building 'access_maps.Rmd'

--- re-building 'intro_to_aopdata.Rmd' using rmarkdown
Quitting from lines 83-92 (intro_to_aopdata.Rmd) 
Error: processing vignette 'intro_to_aopdata.Rmd' failed with diagnostics:
SSL certificate problem: unable to get local issuer certificate
--- failed re-building 'intro_to_aopdata.Rmd'

--- re-building 'landuse_maps.Rmd' using rmarkdown
Linking to GEOS 3.9.1, GDAL 3.2.1, PROJ 7.2.1; sf_use_s2() is TRUE
SSL certificate problem: unable to get local issuer certificate
Problem connecting to data server. Please try aopdata again in a few minutes.
Quitting from lines 33-40 (landuse_maps.Rmd) 
Error: processing vignette 'landuse_maps.Rmd' failed with diagnostics:
SSL certificate problem: unable to get local issuer certificate
--- failed re-building 'landuse_maps.Rmd'

SUMMARY: processing the following files failed:
  'access_inequality.Rmd' 'access_maps.Rmd' 'intro_to_aopdata.Rmd'
  'landuse_maps.Rmd'

Error: Vignette re-building failed.
Execution halted