EOMasters Toolbox Pro

SpeX Options

Database

The database used by the SpeX Processor can be managed in the options. The options are accessible by the standard way in the menu Tools / Options and then you need to select the category EOMTBX and the tab SpeX DB Manager. Alternative you can access it directly via the menu Optical / Spex / Manage SpeX Database.

On the left side all available spectral indices are listed in a tree view, on the right side the details of the currently selected index are shown. In the middle three buttons allow to add, remove and edit user defined indices.

The tree view can be filtered by entering text into the filter field at the top. The list of indices will be reduced to those indices which contain the text in the name, the description, the domain, the formula or the platforms. Capitalisation is ignored for the filtering. Beside the filter field you can toggle how the indices are grouped.

Grouping	Icon	Description
Domain		The indices are grouped by their domain (Default).
Name		The indices are grouped alphabetically by the first letter of their name.
Source		The indices are grouped by their source where they have been taken from.
None		The indices are not grouped at all. Only sorted by name.

For each spectral index the following information is available and displayed on the right side when selected Some are only displayed when the additional attributes panel is expanded (clicked):

• Name: The name of the spectral index.
• Formula: The formula of the spectral index. This formula must be compatible with the Band Maths of SNAP after the symbols have been replaced with the respective value.
• Domain: The application domain of the spectral index. This can be one of Burn, Radar, Snow, Soil, Undefined, Urban, Vegetation, Water
• Symbols: The symbols used in the formula and how they are defined. Each row starts with the symbol itself and then displays the common name and in case of optical bands the min and max wavelength.
• Description: A short description of the spectral index.
• Reference: A reference link to a paper where the spectral index is discussed.
• Platforms: Some example platforms the selected index can be used with.
• Source: The source of the spectral index where its definition has been taken from.

User Defined Spectral Indices

Beside the predefined indices it is possible to add your own user indices. The three buttons in the middle are used to maintain your user defined indices.

Button	Description
	This button allows to add a new spectral index to the database.
	This button removes a spectral index. It is only enabled if a user defined index is selected and disabled if a predefined index is selected.
	This button allows to edit a spectral index. It is only enabled if a user defined index is selected and disabled if a predefined index is selected.

Add/Edit User Defined Spectral Index

When adding or editing a user defined spectral index the following dialog is shown:

You can edit the 5 attributes Name, Formula, Domain, Description and the Reference. The Source attribute will be set automatically.The formula must be compatible with the Band Maths of SNAP after the symbols have been replaced with the respective value.

You can use the button next to the name field to select an existing spectral index and prefill all fields.

In order to write the formula you can hover over the next to the Formula field. It will show a panel with the usable symbols.

The available symbols are also listed on the SpeX Formula Symbols page.