Data on global population distribution are a strategic resource currently in high demand in an age of new Development Agendas that call for universal inclusiveness of people.However,quality,detail,and age of census da...Data on global population distribution are a strategic resource currently in high demand in an age of new Development Agendas that call for universal inclusiveness of people.However,quality,detail,and age of census data varies significantly by country and suffers from shortcomings that propagate to derived population grids and their applications.In this work,the improved capabilities of recent remote sensing-derived global settlement data to detect and mitigate major discrepancies with census data is explored.Open layers mapping builtup presence were used to revise census units deemed as‘unpopulated’and to harmonize population distribution along coastlines.Automated procedures to detect and mitigate these anomalies,while minimizing changes to census geometry,preserving the regional distribution of population,and the overall counts were developed,tested,and applied.The two procedures employed for the detection of deficiencies in global census data obtained high rates of true positives,after verification and validation.Results also show that the targeted anomalies were significantly mitigated and are encouraging for further uses of free and open geospatial data derived from remote sensing in complementing and improving conventional sources of fundamental population statistics.展开更多
Human settlements–the places where people live and work–are rapidly evolving.Some of the processes driving the physical changes in human settlements are population and economic growth,rural-urban migration,and in-si...Human settlements–the places where people live and work–are rapidly evolving.Some of the processes driving the physical changes in human settlements are population and economic growth,rural-urban migration,and in-situ urban transformation that also includes the envelopment of small settlements by larger ones and land-expansive development.In some parts of the world,particularly the global South,urbanization occurs at rates that generate unprecedented city sizes(WUP 2018).展开更多
文摘Data on global population distribution are a strategic resource currently in high demand in an age of new Development Agendas that call for universal inclusiveness of people.However,quality,detail,and age of census data varies significantly by country and suffers from shortcomings that propagate to derived population grids and their applications.In this work,the improved capabilities of recent remote sensing-derived global settlement data to detect and mitigate major discrepancies with census data is explored.Open layers mapping builtup presence were used to revise census units deemed as‘unpopulated’and to harmonize population distribution along coastlines.Automated procedures to detect and mitigate these anomalies,while minimizing changes to census geometry,preserving the regional distribution of population,and the overall counts were developed,tested,and applied.The two procedures employed for the detection of deficiencies in global census data obtained high rates of true positives,after verification and validation.Results also show that the targeted anomalies were significantly mitigated and are encouraging for further uses of free and open geospatial data derived from remote sensing in complementing and improving conventional sources of fundamental population statistics.
文摘Human settlements–the places where people live and work–are rapidly evolving.Some of the processes driving the physical changes in human settlements are population and economic growth,rural-urban migration,and in-situ urban transformation that also includes the envelopment of small settlements by larger ones and land-expansive development.In some parts of the world,particularly the global South,urbanization occurs at rates that generate unprecedented city sizes(WUP 2018).
