Locus GIS portal

The vector data layer is the basic element for data collection or for data presentation in the field. The data layer defines features and their metadata. In the beginning, you need to decide if you want to map points, lines or polygons (area)

New Layer

• Open current project  
• tap on green PLUS  button
• select New empty layer

Basic layer settings

On the Basic tab the new layer dialog is set:

• Name of layer (1)
• Encoding (2) - we suggest using default UTF-8. (It defines the encoding of SpatiaLite DB that is used for storing the data)
• Type (3) - an important parameter that defines the type of geometry that can be collected with this layer. Only points can be collected for the "Point" layer, lines for Line type and areas for Polygon type. It's not possible to change the type of geometry when a layer is created.
• Coordinate reference system (4) - spatial reference system (SRS) to store data. You can change it and search for alternative SRS by name or by EPSG code

Attributes - form definition

On the tab of attributes, fields (form) for the collected data can be defined or edited. At least one attribute has to be defined. To add a new attribute, tap on greenPLUS button > define the name of attribute and type of the attribute

Supported types

• Text data - simple un-formatted text
• Integer - a whole number
• Decimal number - a real number
• Date - date and time - by default, the current date is set  but can be changed
• Yes/No - useful for logical attribute
• Enumeration - it enables to set predefined values and to select a value from a drop-down list during data collection.
  • Tap on to edit values
  • Last used - You can also select a default value that's automatically set during data collection. The default value is the last used option.
• Automatic numbering - custom 'integer' column. Its value is automatically increased when a new feature is created.
• Feature properties - is the special type of attribute value and its value is automatically defined during mapping. The possible values are different for the type of geometry.
  • Point 
    • X coordinate
    • Y coordinate
    • Elevation
    • Horizontal GPS accuracy
    • Vertical GPS accuracy
  • Line 
    • Line length
    • Average horizontal GPS accuracy
    • Average vertical GPS accuracy
  • Polygon
    • Polygon area
    • Perimeter
    • Average horizontal GPS accuracy
    • Average vertical GPS accuracy

      
      

Required field

Every attribute can be signed as required. The value for such fields has to be defined else it is not possible to create a new feature.