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Raster 2 - Combine Population and Ancillary Rasters

This tool combines a raster of population enumeration units with an ancillary dataset to create an output raster with values that correspond to unique combinations of population units and ancillary classes. A standalone attribute table is exported from the raster attribute table that will be used to use intelligent dasymetric mapping to redistribute population within each source unit according to the ancillary classes.


Command line syntax

CombinePopAnc <Population_Raster> <Ancillary_Raster> <Dasymetric_Raster> <Dasymetric_Working_Table>

Parameters
Expression Explanation
<Population_Raster>

A population raster dataset. This raster should have population unit IDs as the "value" field, and an attribute table that contains population counts for the associated population units. It is recommended that you use population raster created by the "Population Features to Raster" tool in this toolbox.

<Ancillary_Raster>

The ancillary raster dataset to be used to redistribute population. This should be the same input as the ancillary dataset used in the Population Features to Raster tool. Land-use or land-cover are the most frequently used ancillary datasets, but any dataset that has classes of relatively homogenous population density could be used here.

<Dasymetric_Raster>

The name and full path of the output dasymetric raster that will be created. This raster will have a single value for each unique combination of population units and ancillary classes.

When you're not saving to a geodatabase, specify .tif for a TIFF file format, .img for an ERDAS IMAGINE file format, or no extension for a GRID file format.

<Dasymetric_Working_Table>

A stand-alone working table will be created that will be used for subsequent dasymetric calculations. Performing calculations on a standalone table is more predictable than trying to perform calculations on a raster value attribute table.

Command Line Example


Scripting syntax

CombinePopAnc (Population_Raster, Ancillary_Raster, Dasymetric_Raster, Dasymetric_Working_Table)

Parameters
Expression Explanation
Population Raster (Required)

A population raster dataset. This raster should have population unit IDs as the "value" field, and an attribute table that contains population counts for the associated population units. It is recommended that you use population raster created by the "Population Features to Raster" tool in this toolbox.

Ancillary Raster (Required)

The ancillary raster dataset to be used to redistribute population. This should be the same input as the ancillary dataset used in the Population Features to Raster tool. Land-use or land-cover are the most frequently used ancillary datasets, but any dataset that has classes of relatively homogenous population density could be used here.

Dasymetric Raster (Required)

The name and full path of the output dasymetric raster that will be created. This raster will have a single value for each unique combination of population units and ancillary classes.

When you're not saving to a geodatabase, specify .tif for a TIFF file format, .img for an ERDAS IMAGINE file format, or no extension for a GRID file format.

Dasymetric Working Table (Required)

A stand-alone working table will be created that will be used for subsequent dasymetric calculations. Performing calculations on a standalone table is more predictable than trying to perform calculations on a raster value attribute table.

Script Example