30 KiB
30 KiB
Measures
Measures Services allow users to access geospatial measures for analysis workflows. Measures are used by sending an identifier or a geometry (Point or Polygon) and receiving back a measure or absolute value for that location. Every measure contained in the Data Catalog can be accessed through the CartoDB Editor.
Below are the methods. For detailed information for accessing any measures, see the catalog here, Catalog PDF
OBS_GetUSCensusMeasure(point_geometry, measure_name);
The OBS_GetUSCensusMeasure(point_geometry, measure_name) method returns a measure based on a subset of the US Census variables at a point location. The OBS_GetUSCensusMeasure method is limited to only a subset of all measures that are available in the Data Observatory, to access the full list, use the OBS_GetMeasure method below.
Arguments
| Name | Description |
|---|---|
| point_geometry | a WGS84 point geometry (the_geom) |
| measure_name | a human readable string name of a US Census variable. The glossary of measure_names is [available below]('measure_name table'). |
| normalize | for measures that are are sums (e.g. population) the default normalization is 'area' and response comes back as a rate per square kilometer. Other options are 'denominator', which will use the denominator specified in the |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| value | the raw or normalized measure |
| name | the human readable name of the measure |
| description | a brief description of the measure |
| type | the data type (text, number, boolean) |
Example
Add a Measure to an empty column based on point locations in your table
UPDATE tablename SET local_male_population = OBS_GetUSCensusMeasure(the_geom, 'Male Population') -> 'value'
Get a measure at a single point location
SELECT * FROM json_each(OBS_GetUSCensusMeasure(CDB_LatLng(40.7, -73.9), 'Male Population'))
OBS_GetUSCensusMeasure(polygon_geometry, measure_name);
The OBS_GetUSCensusMeasure(point_geometry, measure_name) method returns a measure based on a subset of the US Census variables within a given polygon. The OBS_GetUSCensusMeasure method is limited to only a subset of all measures that are available in the Data Observatory, to access the full list, use the OBS_GetMeasure method below.
Arguments
| Name | Description |
|---|---|
| point_geometry | a WGS84 polygon geometry (the_geom) |
| measure_name | a human readable string name of a US Census variable. The glossary of measure_names is [available below]('measure_name table'). |
| normalize | for measures that are are sums (e.g. population) the default normalization is 'none' and response comes back as a raw value. Other options are 'denominator', which will use the denominator specified in the Data Catalog (optional) |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| value | the raw or normalized measure |
| name | the human readable name of the measure |
| description | a brief description of the measure |
| type | the data type (text, number, boolean) |
Example
Add a Measure to an empty column based on polygons in your table
UPDATE tablename SET local_male_population = OBS_GetUSCensusMeasure(the_geom, 'Male Population') -> 'value'
Get a measure at a single polygon
SELECT * FROM json_each(OBS_GetMeasure(ST_Buffer(CDB_LatLng(40.7, -73.9),0.001), 'Male Population'))
OBS_GetMeasure(point_geometry, measure_id);
The OBS_GetMeasure(point_geometry, measure_id) method returns any Data Observatory measure at a point location.
Arguments
| Name | Description |
|---|---|
| point_geometry | a WGS84 point geometry (the_geom) |
| measure_id | a measure identifier from the Data Observatory (see available measures) |
| normalize | for measures that are are sums (e.g. population) the default normalization is 'area' and response comes back as a rate per square kilometer. Other options are 'denominator', which will use the denominator specified in the Data Catalog and 'none' which will return a raw value. (optional) |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| value | the raw or normalized measure |
| name | the human readable name of the measure |
| description | a brief description of the measure |
| type | the data type (text, number, boolean) |
Example
Add a Measure to an empty column based on point locations in your table
UPDATE tablename SET local_male_population = OBS_GetMeasure(the_geom, '"us.census.acs".B08134006') -> 'value'
Get a measure at a single point location
SELECT * FROM json_each(OBS_GetMeasure(CDB_LatLng(40.7, -73.9), '"us.census.acs".B08134006'))
OBS_GetMeasure(polygon_geometry, measure_id);
The OBS_GetMeasure(polygon_geometry, measure_id) method returns any Data Observatory measure calculated within a polygon.
Arguments
| Name | Description |
|---|---|
| polygon_geometry | a WGS84 polygon geometry (the_geom) |
| measure_id | a measure identifier from the Data Observatory (see available measures) |
| normalize | for measures that are are sums (e.g. population) the default normalization is 'none' and response comes back as a raw value. Other options are 'denominator', which will use the denominator specified in the Data Catalog (optional) |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| value | the raw or normalized measure |
| name | the human readable name of the measure |
| description | a brief description of the measure |
| type | the data type (text, number, boolean) |
Example
Add a Measure to an empty column based on polygons in your table
UPDATE tablename SET local_male_population = OBS_GetMeasure(the_geom, '"us.census.acs".B08134006') -> 'value'
Get a measure within a polygon
SELECT * FROM json_each(OBS_GetMeasure(ST_Buffer(CDB_LatLng(40.7, -73.9),0.001), '"us.census.acs".B08134006'))
Boundaries
OBS_GetGeometry(point_geometry, boundary_id)
The OBS_GetGeometry(point_geometry, boundary_id) method returns a boundary geometry defined as overlapping the point geometry and from the desired boundary set (e.g. Census Tracts). See the Boundary ID glossary table below. This is a useful method for performing aggregations of points.
Arguments
| Name | Description |
|---|---|
| point_geometry | a WGS84 polygon geometry (the_geom) |
| boundary_id | a boundary identifier from the Boundary ID glossary table below |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| geom | WKB geometry |
Example
Overwrite a point geometry with a boundary geometry that contains it in your table
UPDATE tablename SET the_geom = OBS_GetGeometry(the_geom, ' "us.census.tiger".block_group')
OBS_GetGeometryId(point_geometry, boundary_id)
The OBS_GetGeometryId(point_geometry, boundary_id) returns a unique geometry_id for the boundary geometry that contains a given point geometry. See the Boundary ID glossary table below. The method can be combined with OBS_GetGeometryById(geometry_id) to create a point aggregation workflow.
Arguments
| Name | Description |
|---|---|
| point_geometry | a WGS84 polygon geometry (the_geom) |
| boundary_id | a boundary identifier from the Boundary ID glossary table below |
Returns
A JSON object containing the following properties
| Key | Description |
|---|---|
| geometry_id | a string identifier of a geometry in the Boundaries |
Example
Write the geometry_id that contains the point geometry for every row as a new column in your table
UPDATE tablename SET new_column_name = OBS_GetGeometryId(the_geom, ' "us.census.tiger".block_group')
OBS_GetGeometryById(geometry_id)
Discovery
OBS_Search(Search Term, Relevant Boundary)
OBS_GetAvailableBoundaries(Relevant Geometry)
Glossary
Boundary IDs
| Boundary name | Boundary ID |
|---|---|
| US Census Block Groups | "us.census.tiger".block_group |
| US Census Tracts | "us.census.tiger".census_tract |
| US States | "us.census.tiger".state |
| US County | "us.census.tiger".county |
| US Census Public Use Microdata Areas | "us.census.tiger".puma |
| US Census Zip Code Tabulation Areas | "us.census.tiger".zcta5 |
| Unified School District | "us.census.tiger".school_district_unified |
| US Congressional Districts | "us.census.tiger".congressional_district |
| Elementary School District | "us.census.tiger".school_district_elementary |
| Secondary School District | "us.census.tiger".school_district_secondary |
| US Census Blocks | "us.census.tiger".block |
OBS_GetUSCensusMeasure names table
Below is a list of human readable names accepted in the OBS_GetUSCensusMeasure method. For the more comprehensive list of columns available to the OBS_GetMeasure method, see the [Data Catalog]
| Measure name | Measure description |
|---|---|
| Total Population | The total number of all people living in a given geographic area. This is a very useful catch-all denominator when calculating rates. |
| Male Population | The number of people within each geography who are male. |
| Female Population | The number of people within each geography who are female. |
| Median Age | The median age of all people in a given geographic area. |
| White Population | The number of people identifying as white, non-Hispanic in each geography. |
| Black or African American Population | The number of people identifying as black or African American, non-Hispanic in each geography. |
| Asian Population | The number of people identifying as Asian, non-Hispanic in each geography. |
| Hispanic Population | The number of people identifying as Hispanic or Latino in each geography. |
| American Indian and Alaska Native Population | The number of people identifying as American Indian or Alaska native in each geography. |
| Other Race population | The number of people identifying as another race in each geography |
| Two or more races population | The number of people identifying as two or more races in each geography |
| Population not Hispanic | The number of people not identifying as Hispanic or Latino in each geography. |
| Not a U.S. Citizen Population | The number of people within each geography who indicated that they are not U.S. citizens. |
| Workers over the Age of 16 | The number of people in each geography who work. Workers include those employed at private for-profit companies, the self-employed, government workers and non-profit employees. |
| Commuters by Car, Truck, or Van | The number of workers age 16 years and over within a geographic area who primarily traveled to work by car, truck or van. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. |
| Commuters who drove alone | The number of workers age 16 years and over within a geographic area who primarily traveled by car driving alone. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. |
| Commuters by Carpool | The number of workers age 16 years and over within a geographic area who primarily traveled to work by carpool. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. |
| Commuters by Public Transportation | The number of workers age 16 years and over within a geographic area who primarily traveled to work by public transportation. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. |
| Commuters by Bus | The number of workers age 16 years and over within a geographic area who primarily traveled to work by bus. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. This is a subset of workers who commuted by public transport. |
| Commuters by Subway or Elevated | The number of workers age 16 years and over within a geographic area who primarily traveled to work by subway or elevated train. This is the principal mode of travel or type of conveyance, by distance rather than time, that the worker usually used to get from home to work. This is a subset of workers who commuted by public transport. |
| Walked to Work | The number of workers age 16 years and over within a geographic area who primarily walked to work. This would mean that of any way of getting to work, they travelled the most distance walking. |
| Worked at Home | The count within a geographical area of workers over the age of 16 who worked at home. |
| Children under 18 Years of Age | The number of people within each geography who are under 18 years of age. |
| Households | A count of the number of households in each geography. A household consists of one or more people who live in the same dwelling and also share at meals or living accommodation, and may consist of a single family or some other grouping of people. |
| Population 3 Years and Over | The total number of people in each geography age 3 years and over. This denominator is mostly used to calculate rates of school enrollment. |
| Students Enrolled in School | The total number of people in each geography currently enrolled at any level of school, from nursery or pre-school to advanced post-graduate education. Only includes those over the age of 3. |
| Students Enrolled in Grades 1 to 4 | The total number of people in each geography currently enrolled in grades 1 through 4 inclusive. This corresponds roughly to elementary school. |
| Students Enrolled in Grades 5 to 8 | The total number of people in each geography currently enrolled in grades 5 through 8 inclusive. This corresponds roughly to middle school. |
| Students Enrolled in Grades 9 to 12 | The total number of people in each geography currently enrolled in grades 9 through 12 inclusive. This corresponds roughly to high school. |
| Students Enrolled as Undergraduate in College | The number of people in a geographic area who are enrolled in college at the undergraduate level. Enrollment refers to being registered or listed as a student in an educational program leading to a college degree. This may be a public school or college, a private school or college. |
| Population 25 Years and Over | The number of people in a geographic area who are over the age of 25. This is used mostly as a denominator of educational attainment. |
| Population Completed High School | The number of people in a geographic area over the age of 25 who completed high school, and did not complete a more advanced degree. |
| Population completed less than one year of college, no degree | The number of people in a geographic area over the age of 25 who attended college for less than one year and no further. |
| Population completed more than one year of college, no degree | The number of people in a geographic area over the age of 25 who attended college for more than one year but did not obtain a degree |
| Population Completed Associates Degree | The number of people in a geographic area over the age of 25 who obtained a associates degree, and did not complete a more advanced degree. |
| Population Completed Bachelors Degree | The number of people in a geographic area over the age of 25 who obtained a bachelors degree, and did not complete a more advanced degree. |
| Population Completed Masters Degree | The number of people in a geographic area over the age of 25 who obtained a masters degree, but did not complete a more advanced degree. |
| Population 5 Years and Over | The number of people in a geographic area who are over the age of 5. This is primarily used as a denominator of measures of language spoken at home. |
| Speaks only English at Home | The number of people in a geographic area over age 5 who speak only English at home. |
| Speaks Spanish at Home | The number of people in a geographic area over age 5 who speak Spanish at home, possibly in addition to other languages. |
| Population for Whom Poverty Status Determined | The number of people in each geography who could be identified as either living in poverty or not. This should be used as the denominator when calculating poverty rates, as it excludes people for whom it was not possible to determine poverty. |
| Income In The Past 12 Months Below Poverty Level | The number of people in a geographic area who are part of a family (which could be just them as an individual) determined to be in poverty following the Office of Management and Budgets Directive 14. (https://www.census.gov/hhes/povmeas/methodology/ombdir14.html) |
| Median Household Income in the past 12 Months | Within a geographic area, the median income received by every household on a regular basis before payments for personal income taxes, social security, union dues, medicare deductions, etc. It includes income received from wages, salary, commissions, bonuses, and tips; self-employment income from own nonfarm or farm businesses, including proprietorships and partnerships; interest, dividends, net rental income, royalty income, or income from estates and trusts; Social Security or Railroad Retirement income; Supplemental Security Income (SSI); any cash public assistance or welfare payments from the state or local welfare office; retirement, survivor, or disability benefits; and any other sources of income received regularly such as Veterans (VA) payments, unemployment and/or workers compensation, child support, and alimony. |
| Gini Index | |
| Per Capita Income in the past 12 Months | |
| Housing Units | A count of housing units in each geography. A housing unit is a house, an apartment, a mobile home or trailer, a group of rooms, or a single room occupied as separate living quarters, or if vacant, intended for occupancy as separate living quarters. |
| Vacant Housing Units | The count of vacant housing units in a geographic area. A housing unit is vacant if no one is living in it at the time of enumeration, unless its occupants are only temporarily absent. Units temporarily occupied at the time of enumeration entirely by people who have a usual residence elsewhere are also classified as vacant. |
| Vacant Housing Units for Rent | The count of vacant housing units in a geographic area that are for rent. A housing unit is vacant if no one is living in it at the time of enumeration, unless its occupants are only temporarily absent. Units temporarily occupied at the time of enumeration entirely by people who have a usual residence elsewhere are also classified as vacant. |
| Vacant Housing Units for Sale | The count of vacant housing units in a geographic area that are for sale. A housing unit is vacant if no one is living in it at the time of enumeration, unless its occupants are only temporarily absent. Units temporarily occupied at the time of enumeration entirely by people who have a usual residence elsewhere are also classified as vacant. |
| Median Rent | The median contract rent within a geographic area. The contract rent is the monthly rent agreed to or contracted for, regardless of any furnishings, utilities, fees, meals, or services that may be included. For vacant units, it is the monthly rent asked for the rental unit at the time of interview. |
| Percent of Household Income Spent on Rent | Within a geographic area, the median percentage of household income which was spent on gross rent. Gross rent is the amount of the contract rent plus the estimated average monthly cost of utilities (electricity, gas, water, sewer etc.) and fuels (oil, coal, wood, etc.) if these are paid by the renter. Household income is the sum of the income of all people 15 years and older living in the household. |
| Owner-occupied Housing Units | |
| Owner-occupied Housing Units valued at $1,000,000 or more. | The count of owner occupied housing units in a geographic area that are valued at $1,000,000 or more. Value is the respondents estimate of how much the property (house and lot, mobile home and lot, or condominium unit) would sell for if it were for sale. |
| Owner-occupied Housing Units with a Mortgage | The count of housing units within a geographic area that are mortagaged. Mortgage refers to all forms of debt where the property is pledged as security for repayment of the debt, including deeds of trust, trust deed, contracts to purchase, land contracts, junior mortgages, and home equity loans. |
| Families with young children (under 6 years of age) | |
| Two-parent families with young children (under 6 years of age) | |
| Two-parent families, both parents in labor force with young children (under 6 years of age) | |
| Two-parent families, father only in labor force with young children (under 6 years of age) | |
| Two-parent families, mother only in labor force with young children (under 6 years of age) | |
| Two-parent families, neither parent in labor force with young children (under 6 years of age) | |
| One-parent families with young children (under 6 years of age) | |
| One-parent families, father, with young children (under 6 years of age) | |
| Men age 45 to 64 (middle aged) | 0 |
| Men age 45 to 49 | |
| Men age 50 to 54 | |
| Men age 55 to 59 | |
| Men age 60 to 61 | |
| Men age 62 to 64 | |
| Black Men age 45 to 54 | |
| Black Men age 55 to 64 | |
| Hispanic Men age 45 to 54 | |
| Hispanic Men age 55 to 64 | |
| White Men age 45 to 54 | |
| White Men age 55 to 64 | |
| Asian Men age 45 to 54 | |
| Asian Men age 55 to 64 | |
| Men age 45 to 64 who attained less than a 9th grade education | |
| Men age 45 to 64 who attained between 9th and 12th grade, no diploma | |
| Men age 45 to 64 who completed high school or obtained GED | |
| Men age 45 to 64 who completed some college, no degree | |
| Men age 45 to 64 who obtained an associates degree | |
| Men age 45 to 64 who obtained a bachelors degree | |
| Men age 45 to 64 who obtained a graduate or professional degree | |
| One-parent families, father in labor force, with young children (under 6 years of age) | |
| Population 15 Years and Over | The number of people in a geographic area who are over the age of 15. This is used mostly as a denominator of marital status. |
| Never Married | The number of people in a geographic area who have never been married. |
| Currently married | The number of people in a geographic area who are currently married |
| Married but separated | The number of people in a geographic area who are married but separated |
| Widowed | The number of people in a geographic area who are widowed |
| Divorced | The number of people in a geographic area who are divorced |
| Workers age 16 and over who do not work from home | The number of workers over the age of 16 who do not work from home in a geographic area |
| Number of workers with less than 10 minute commute | The number of workers over the age of 16 who do not work from home and commute in less than 10 minutes in a geographic area |
| Number of workers with a commute between 10 and 14 minutes | The number of workers over the age of 16 who do not work from home and commute in between 10 and 14 minutes in a geographic area |
| Number of workers with a commute between 15 and 19 minutes | The number of workers over the age of 16 who do not work from home and commute in between 15 and 19 minutes in a geographic area |
| Number of workers with a commute between 20 and 24 minutes | The number of workers over the age of 16 who do not work from home and commute in between 20 and 24 minutes in a geographic area |
| Number of workers with a commute between 25 and 29 minutes | The number of workers over the age of 16 who do not work from home and commute in between 25 and 29 minutes in a geographic area |
| Number of workers with a commute between 30 and 34 minutes | The number of workers over the age of 16 who do not work from home and commute in between 30 and 34 minutes in a geographic area |
| Number of workers with a commute between 35 and 44 minutes | The number of workers over the age of 16 who do not work from home and commute in between 35 and 44 minutes in a geographic area |
| Number of workers with a commute between 45 and 59 minutes | The number of workers over the age of 16 who do not work from home and commute in between 45 and 59 minutes in a geographic area |
| Number of workers with a commute of over 60 minutes | The number of workers over the age of 16 who do not work from home and commute in over 60 minutes in a geographic area |
| Aggregate travel time to work | The total number of minutes every worker over the age of 16 who did not work from home spent spent commuting to work in one day in a geographic area |
| Households with income less than $10,000 | The number of households in a geographic area whose annual income was less than $10,000. |
| Households with income of $10,000 to $14,999 | The number of households in a geographic area whose annual income was between $10,000 and $14,999. |
| Households with income of $15,000 to $19,999 | The number of households in a geographic area whose annual income was between $15,000 and $19,999. |
| Households with income of $20,000 To $24,999 | The number of households in a geographic area whose annual income was between $20,000 and $24,999. |
| Households with income of $25,000 To $29,999 | The number of households in a geographic area whose annual income was between $20,000 and $24,999. |
| Households with income of $30,000 To $34,999 | The number of households in a geographic area whose annual income was between $30,000 and $34,999. |
| Households with income of $35,000 To $39,999 | The number of households in a geographic area whose annual income was between $35,000 and $39,999. |
| Households with income of $40,000 To $44,999 | The number of households in a geographic area whose annual income was between $40,000 and $44,999. |
| Households with income of $45,000 To $49,999 | The number of households in a geographic area whose annual income was between $45,000 and $49,999. |
| Households with income of $50,000 To $59,999 | The number of households in a geographic area whose annual income was between $50,000 and $59,999. |
| Households with income of $60,000 To $74,999 | The number of households in a geographic area whose annual income was between $60,000 and $74,999. |
| Households with income of $75,000 To $99,999 | The number of households in a geographic area whose annual income was between $75,000 and $99,999. |
| Households with income of $100,000 To $124,999 | The number of households in a geographic area whose annual income was between $100,000 and $124,999. |
| Households with income of $125,000 To $149,999 | The number of households in a geographic area whose annual income was between $125,000 and $149,999. |
| Households with income of $150,000 To $199,999 | The number of households in a geographic area whose annual income was between $150,000 and $1999,999. |
| Population age 16 and over | The number of people in each geography who are age 16 or over. |
| Population in Labor Force | The number of people in each geography who are either in the civilian labor force or are members of the U.S. Armed Forces (people on active duty with the United States Army, Air Force, Navy, Marine Corps, or Coast Guard). |
| Population in Civilian Labor Force | The number of civilians 16 years and over in each geography who can be classified as either employed or unemployed below. |
| Employed Population | The number of civilians 16 years old and over in each geography who either (1) were at work, that is, those who did any work at all during the reference week as paid employees, worked in their own business or profession, worked on their own farm, or worked 15 hours or more as unpaid workers on a family farm or in a family business; or (2) were with a job but not at work, that is, those who did not work during the reference week but had jobs or businesses from which they were temporarily absent due to illness, bad weather, industrial dispute, vacation, or other personal reasons. Excluded from the employed are people whose only activity consisted of work around the house or unpaid volunteer work for religious, charitable, and similar organizations; also excluded are all institutionalized people and people on active duty in the United States Armed Forces. |
| Unemployed Population | The number of civilians in each geography who are 16 years old and over are classified as unemployed if they (1) were neither at work nor with a job but not at work during the reference week, and (2) were actively looking for work during the last 4 weeks, and (3) were available to start a job. Also included as unemployed are civilians who did not work at all during the reference week, were waiting to be called back to a job from which they had been laid off, and were available for work except for temporary illness. Examples of job seeking activities are: |
| * Registering at a public or private employment office | |
| * Meeting with prospective employers | |
| * Investigating possibilities for starting a professional | |
| practice or opening a business | |
| * Placing or answering advertisements | |
| * Writing letters of application | |
| * Being on a union or professional register | |
| Population in Armed Forces | The number of people in each geography who are members of the U.S. Armed Forces (people on active duty with the United States Army, Air Force, Navy, Marine Corps, or Coast Guard). |
| Population Not in Labor Force | The number of people in each geography who are 16 years old and over who are not classified as members of the labor force. This category consists mainly of students, homemakers, retired workers, seasonal workers interviewed in an off season who were not looking for work, institutionalized people, and people doing only incidental unpaid family work (less than 15 hours during the reference week). |
| Households with income of $200,000 Or More | The number of households in a geographic area whose annual income was more than $200,000. |