Tools Menu

Manage Features/Attribs etc.

To setup or edit a database design select the Manage Features/Attribs etc option from the Tools Menu. Use the vertical and horizontal tabs on the displayed form to manage/edit the following items:

Feature Types

Click on the Feature Types tab to setup and edit the feature types in the currently opened STEMgis database.

To edit an existing feature type select a feature type from the drop-down list or to add a new feature type click on the New button. You can then enter or modify any of the items which are used to define a feature type. If a new feature type is being added then a Feature Type Code and a Feature Type Name must be entered. All other items (except those designated as optional) will take default values unless you enter or change the values. The items that may be entered or modified are:

Attributes

Click on the Attribute tab to setup and edit the attribute definitions.

To edit an existing attribute select an attribute from the drop-down list or to add a new attribute click on the New button. You can then enter or modify any of the items which are used to define an attribute. If a new attribute is being added then an Attribute Code and an Attribute Name must be entered. All other items (except those designated as optional) will take default values unless you enter or change the values. The items that may be entered or modified are:

A special case exists for attribute names. To plot a pair of attributes as proportional arrows as opposed to proportional symbols the pair of attribute names must end in speed (or Speed) and direction (or Direction), e.g. 'Current Speed' and 'Current Direction'. When these data are retrieved from the database the Query Wizard interprets the names and plots the data as proportional arrows. The statistics are also calculated assuming polar co-ordinates.

Note: Many attribute definitions can be added at once by loading an attribute definition CSV file.

Defining Frame/Band Attributes in a Multiband Grid Attribute Definition

If a grid attribute definition has more than one frame/band then each frame/band must match up to an existing attribute definition in the database. This allows STEMgis Viewer to know information about default palettes, names, units etc. The form below is activated by clicking on the Define Frames/Bands button on the Manage Attributes form.

The list on the left provides the existing attribute definitions stored in the database. Left-click on an attribute name to select it and then click on the > button to transfer it to the list of frame attribute codes, i.e. those attribute representing each frame/band in the grid attribute definition. In the illustration above we have three frames/bands belonging to the grid attribute definition. To remove one you can left-click on the attribute name and then left-click on the < button. To change the order of the attribute names, left-click on the names and then click on the Up or Down button to alter it's position within the list.

Units

Click on the Unit tab to setup and edit the unit definitions.

To edit an existing unit select a unit from the drop-down list or to add a new unit click on the New button. You can then enter or modify any of the items which are used to define a unit. If a new unit is being added then a Unit Code and a Unit Name must be entered. All other items (except those designated as optional) will take default values unless you enter or change the values. The items that may be entered or modified are:

Dictionaries

Click on the Dictionary tab to setup and edit the dictionary definitions.

To edit an existing dictionary select a dictionary from the drop-down list or to add a new dictionary click on the New button. You can then enter or modify any of the items which are used to define a dictionary. If a new dictionary is being added then a Dictionary Code and a Dictionary Name must be entered. All other items (except those designated as optional) will take default values unless you enter or change the values. The items that may be entered or modified are:

Projections

Click on the vertical Database Definitions vertical tab and the Projection Limits horizontal tab to display the form that allows the projection definitions to be edited.

Select a projection from the hierarchical list and enter any required pre- and/or post-projection clip values in the white text boxes. The light blue text boxes cannot be edited and text within them is provided for information only.

Due to the algorithms used in many projections a wrap around effect can occur when applied to global map coverage. The effect is manifested as parts of the world outside the relevant area of the projection doubling across or wrapping around those parts that are valid within the projection. It is possible to overcome this effect by clipping the co-ordinate data prior to the projection and then clipping the projected co-ordinates post-projection. The pre- and post-clipping parameters are defined and adjusted as shown above. The post-clipping parameters also provide the ability to set up study areas.

Palettes

Click on the vertical Database Definitions vertical tab and the Palettes horizontal tab to display the form that allows the user to define and/or edit colour palettes.

To edit an existing palette select a palette from the drop-down list or to add a new palette click on the New button. You can then enter or modify a series of colour 'break points' which are used to define a palette. If a new palette is being added then a Palette Name must be entered.

Up to 10 break points can be defined in each palette. These break points may be positioned anywhere within the 0 to 255 range of colours. Colours are interpolated between each break point to give a continuous shading pattern. The interpolation is linear in the red, green and blue components of the colour. To define a break point, type in the required position between 0 and 255 and then left-click on the neighbouring colour box. This invokes the standard Windows colour picker. Select your desired colour and click OK. To view the modified palette at any time click on the Adjust Current Palette button.

 

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