XYZ

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Terminology ​

Cluster ​

A collection of multiple locations represented as a single feature.

Entry ​

Usually a javascript object in an array of objects. e.g. an infoj entry.

Extent ​

A specific geographical area.

Feature ​

An [Openlayers] feature is an object consisting of a geometry, and associated properties.

Filter ​

Layer filters that exclude certain locations.

Flag ​

A boolean variable.

Gazetteer ​

The search box on the side panel.

GeoJSON ​

Format for encoding geographic data structures.

geom ​

Usually the field name which holds a layer feature's geometry.

Geometry ​

A graphical entity displayed on the map, such as a point or polygon.

GraphHopper ​

Open-source road routing library and server.

Infoj ​

Information displayed on side panel when a geometry is clicked on.

[String] Interpolation [Expression] ​

String interpolation is evaluation of a template literal and expanding/substituting the interpolation expressions / variables (${variable}) in it for the string output.

Key ​

A key of an object. e.g. foo of O whereas O = {foo: 'bar'}

Key-Value ​

A the value associated with a key. e.g. 'bar' as foo key-value of O whereas O = {foo: 'bar'}

Layer ​

A collection of geographical features / locations represented by a single datasource.

[JSON] Layer ​

A config block that defines a layer in the workspace. The JSON layer can be added to a mapview.

[Mapview] Layer ​

A functional object decorated from a JSON Layer when added to the mapview.

Locale ​

Locales define the functional and geographical extent of a mapview. A workspace can hold many locales but only one locale can be loaded into a single mapview.

Location ​

A geometry in the map that can be clicked on.

MAPP ​

The front end library which allows secure access to, and enables the visualisation of spatial data through the XYZ API.

Mapview ​

The map element in an application view. A locale is required to initialise a mapview.

MVT ​

Mapbox Vector Tiles. A protobuf format for vector geometries split into tiles.

MVT Cache ​

A table to cache MVTiles which have already been generated by the XYZ API.

MVT Layer ​

A Mapp layer represented by vector tiles generated by the XYZ API.

Object ​

Any JavaScript object. Usualy a set of key-values whereas the value can be nested a object.

OpenLayers ​

An Open-source mapping library to render spatial data in the browser.

Plugin ​

A JavaScript modul which can be imported dynamically to alter and expand Mapp functionality.

Query [Template] ​

A SQL query with variable placeholders to be substituded by the database. Queries can be defined as templates in the workspace.

[Object] Root ​

The first level of an object, not in a nested object. The root key is in this object's root. The nested key is an object associated with the root key.

js
{
  root: {
    nested: "value";
  }
}

SAML (Security Assertion Markup Language) ​

Markup for secure identities provided to a service for authentication.

SRID (Spatial Reference Identifier) ​

A unique identifier of a coordinate system. Consistent with the EPSG (European Petroleum Survey Group) code.

SSO (Single Sign-On) ​

Shared identification via SAML enables use multiple systems with a single login.

Templates ​

JSON objects which can be combined to build complex workspace objects to define locales and layer.

Vercel ​

A service provider which supports deployments to AWS Lambda.

Viewport ​

The cartographic extent visible in a mapview. Usually defined by north, west, south, and east bounding lines.

[Application] View [Template] ​

A application view is a markup document (plus styles and script) which is loaded as an [website] application in a browser client. Views can be defined as templates in the workspace.

Workspace ​

A JSON object which defines the locale, layer, and locations available through the XYZ host.

qID ​

The unique qID field name for a location. The field must be defined as serial in order to add new locations to a layer table.

XYZ ​

The node js back-end application.