A dasymetric map (from Greek δασύς dasýs 'dense' and μέτρο métro 'measure') is a type of thematic map that uses areal symbols to visualize a geographic field by refining a choropleth map with ancillary information about the distribution of the variable.

2008年7月20日 · We have worked with various communities to create accurate population density maps to aid in risk and vulnerability analysis linked to natural hazards. By using the USGS- developed, GIS-based tool, we can automate the dasymetric mapping process.

2024年6月28日 · Dasymetric mapping is a geospatial technique that uses additional information, such as landcover types, to more accurately distribute data that has been assigned to arbitrary boundaries, such as census blocks.

A method of reorganizing map data gathered from one data collection unit into inherently more precise areas. The boundaries of the original data collection units are modified using related supporting.

Dasymetric mapping is a cartographic technique with roots in choropleth mapping. Both techniques originated in the 1800s when cartographers and others began to design maps of population distributions.

2024年4月1日 · Dasymetric mapping reduces the effects of spatial aggregation and boundary effects seen in choropleth maps. Advanced GIS techniques are often used to create dasymetric maps by integrating multiple spatial datasets.

2008年7月20日 · Dasymetric Map of the San Francisco Bay Area. By using the USGS- developed, GIS-based tool, we can automate the dasymetric mapping process. We have worked with various communities to create accurate population density maps to aid in risk and vulnerability analysis linked to natural hazards.

2024年3月11日 · The downloadable Dasymetric Toolbox allows users to more accurately distribute population data that has been assigned to arbitrary boundaries, such as census blocks. A national map for the dasymetric allocation of population is also available in the Interactive Map.

2016年7月12日 · Dasymetric mapping is a geospatial technique that uses information such as landcover types to more accurately distribute data that have been assigned to arbitrary boundaries like census blocks. The image on the left shows a map of the population by block group based solely on the census data.

Dasymetric maps show densities of areas regarding geographic properties. Choroplethic maps in relation to geometric areal units such as grid squares. Below all three map types are described in details.