The ```OBS_MetadataValidation``` function peforms a validation check over
the known issues using the extent, type of geometry and metadata we're going
to use in the ```OBS_GetMeta``` function.
The ```OBS_MetadataValidation``` function performs a validation check over the known issues using the extent, type of geometry, and metadata that is being used in the ```OBS_GetMeta``` function.
#### Arguments
Name | Description
---- | -----------
extent | A geometry of the extent of the input geometries
geometry_type | The geometry type of the source data.
metadata | A JSON array composed of metadata input objects. Each indicates one desired measure for an output column, and optionally additional parameters about that column
target_geoms | Target number of geometries. Boundaries with close to this many objects within `extent` will be ranked highest.
geometry_type | The geometry type of the source data
metadata | A JSON array composed of metadata input objects. Each indicates one desired measure for an output column, and optional additional parameters about that column
target_geoms | Target number of geometries. Boundaries with close to this many objects within `extent` will be ranked highest
The schema of the metadata input objects are as follows:
Metadata Input Key | Description
--- | -----------
numer_id | The identifier for the desired measurement. If left blank, but a `geom_id` is specified, the column will return a geometry instead of a measurement.
geom_id | Identifier for a desired geographic boundary level to use when calculating measures. Will be automatically assigned if undefined. If defined but `numer_id` is blank, then the column will return a geometry instead of a measurement.
normalization | The desired normalization. One of 'area', 'prenormalized', or 'denominated'. 'Area' will normalize the measure per square kilometer, 'prenormalized' will return the original value, and 'denominated' will normalize by a denominator. Ignored if this metadata object specifies a geometry.
denom_id | Identifier for a desired normalization column in case `normalization` is 'denominated'. Will be automatically assigned if necessary. Ignored if this metadata object specifies a geometry.
numer_timespan | The desired timespan for the measurement. Defaults to most recent timespan available if left unspecified.
geom_timespan | The desired timespan for the geometry. Defaults to timespan matching numer_timespan if left unspecified.
target_area | Instead of aiming to have `target_geoms` in the area of the geometry passed as `extent`, fill this area. Unit is square degrees WGS84. Set this to `0` if you want to use the smallest source geometry for this element of metadata, for example if you're passing in points.
numer_id | The identifier for the desired measurement. If left blank, a `geom_id` is specified and the column returns a geometry, instead of a measurement
geom_id | Identifier for a desired geographic boundary level used to calculate measures. If undefined, this is automatically assigned. If defined, `numer_id` is blank and the column returns a geometry, instead of a measurement
normalization | The desired normalization. One of 'area', 'prenormalized', or 'denominated'. 'Area' will normalize the measure per square kilometer, 'prenormalized' will return the original value, and 'denominated' will normalize by a denominator. If the metadata object specifies a geometry, this is ignored
denom_id | When `normalization` is 'denominated', this is the identifier for a desired normalization column. This is automatically assigned. If the metadata object specifies a geometry, this is ignored
numer_timespan | The desired timespan for the measurement. If left unspecified, it defaults to the most recent timespan available
geom_timespan | The desired timespan for the geometry. If left unspecified, it defaults to the timespan matching `numer_timespan`
target_area | Instead of aiming to have `target_geoms` in the area of the geometry passed as `extent`, fill this area. Unit is square degrees WGS84. Set this to `0` if you want to use the smallest source geometry for this element of metadata. For example, if you are passing in points
target_geoms | Override global `target_geoms` for this element of metadata
max_timespan_rank | Only include timespans of this recency (for example, `1` is only the most recent timespan). No limit by default
max_score_rank | Only include boundaries of this relevance (for example, `1` is the most relevant boundary). Is `1` by default
max_timespan_rank | Only include timespans of this recency (For example, `1` is only the most recent timespan). There is no limit by default
max_score_rank | Only include boundaries of this relevance (for example, `1` is the most relevant boundary). The default is `1`
#### Returns
Key | Description
--- | -----------
valid | A boolean field that represents if the validation was succesful or not
errors | A text array with all the possible errors.
valid | A boolean field that represents if the validation was successful or not
errors | A text array with all possible errors
#### Examples
Validate metadata with two additional column of US census
data, using a boundary relevant for the geometry provided and latest timespan.
Limit to only the most recent column most relevant to the extent & density of
input geometries in `tablename`.
Validate metadata with two additional columns of US census data; using a boundary relevant for the geometry provided and the latest timespan. Limited to the most recent column, and the most relevant, based on the extent and density of input geometries in `tablename`.
csobier
7 years ago