The prepare recipe provides a variety of processors to work with geographic information.
For an overview of all geographic capabilities in DSS, please see Geographic data
DSS also provides a set of formulas to compute geographic operations (see Formula language)
DSS provides two processors to convert between a Geopoint column and latitude/longitude columns:
The Resolve GeoIP processor uses the GeoIP database (https://www.maxmind.com) to resolve an IP address to the associated geographic coordinates.
It produces two kinds of information:
Administrative data (country, region, city, …)
Geographic data (latitude, longitude)
The output GeoPoint can be used for Map Charts.
Change coordinates system¶
This processor changes the Coordinates Reference System (CRS) of a geometry or geopoint column.
Source and target CRS can be given either as a EPSG code (e.g., “EPSG:4326”) or as a projected coordinate system WKT (e.g., “PROJCS[…]”).
Use this processor to convert data projected in a different CRS to the WGS84 (EPSG:4326) coordinates system.
Compute distances between points¶
The /preparation/processors/geopoint-distance processor allows you to compute distance between points
Create area around a geopoint¶
The Create area around a geopoint processor performs creation of polygons centered on input geopoints. For each input geospatial point, a spatial polygon is created around it, delimiting the area of influence covered by the point (all the points that fall within a given distance from the geopoint). The shape area of the polygon can be either rectangular or circular (using an approximation) and the size will depend on the selected parameters.
Extract from geo column¶
The Extract from geo column processor extracts data from a geometry column:
length (if input is not a point),
area (if input is a polygon).