The Options Dialog

The Options dialog window contains several categories of settings you are able to change. In the following sections screen shots are shown where the settings for the user interface behavior can be edited. Depending on the number of Toolboxes installed in SNAP, the header area might contain different items.

General Settings

UI Behaviour

This preferences page contains general user interface behavior and memory management settings.

• Show navigation window when image views are opened
  If an image view is opened the Navigation Window will also be opened.
• Open image view for new (virtual) bands
  Currently, this option only affects the Band Maths tool. If this option is selected, a new image view is automatically created and opened for any new bands created in the band maths tool.
• Show only pixel values of displayed bands
  If selected, the pixel info view will only show pixel values of bands which are currently displayed in an image view. If this option is not selected, the Sentinel Toolbox displays all bands contained in a product. For those bands which are currently not displayed, the Sentinel Toolbox reads the sample values directly from the product file. Depending on your computer's I/O performance and the location of the product file (e.g. CD-ROM, harddrive, network) this can have an impact on the runtime performance.
• Maximum recent file list
  Specify the number of recent files that appear in the File Menu under "Reopen Product".
• Show suppressed message dialogs again
  Some dialogs of the Sentinel Toolbox can be disabled by checking the option "Don't show this message again". You can select this option to enable all message and tip dialog boxes again.

Geo-Location

This preferences page enables settings related to the geo-location of pixels, pins, etc.

The Sentinel Toolbox uses an image coordinate system whose origin (x=0, y=0) is the upper left corner of the upper left pixel. Image X-coordinates increase to the right, Y-values increase downwards. The center of the pixel in the origin is then located at (x=0.5, y=0.5).

• Snap pins to exact geo-location after import, transfer to another product, or geo-coding change
  Enables pins to be displayed at exact location on the image.
• Use sub-pixel fraction accuracy for pixel-based geo-coding
  When geo-coding is pixel-based, a sub-pixel fraction accuracy shall be used (see also "Show pixel coordinates with fractional part" below).
• Use high precision approximations for inverse tie point geo-coding
  When geo-coding is tie-point based, high precision inverse approximations are used. Enabling this option slows down the performance but increases the accuracy a bit further.
• Show geographical coordinates in decimal degrees
  Use decimal degree values instead of minutes and seconds.
• Show pixel coordinates with fractional part
  Don't display integer coordinates.
• Show pixel coordinates starting at (1,1)
  In opposite to the default setting where the pixel coordinates start at (0,0), let them count from (1,1).

Image View

This preferences page enables settings related to the geo-location of pixels, pins, etc.

• Show a navigation control widget in image views
  If this option is selected, the Sentinel Toolbox shows a navigation widget in image views for moving and rotating images within the viewport:
  
  
• Show scroll bars in image views
  If this option is selected, image views are shown with horizontal and vertical scroll bars.
• Invert mouse wheel scrolling (zoom in/zoom out)
  For convenience, zoom in or out like e.g. in Google Earth.

RGB Profiles

This preference page is used to edit the RGB profiles used for RGB image creation from various product types. An RGB-Profile defines the band maths expressions to be used for the red, green and blue components of an RGB image. For detailed information about RGB-Profiles please refer to the chapter RGB-Image Profile located at Sentinel Toolbox Application/Tools/Imaging Tools

• Use the to open a stored RGB-Profile file.
• Use the to save the currently displayed RGB-Profile.
• Use the to delete the currently displayed RGB-Profile.

• Red - Defines the mathematical expression for the red channel.
  
• Green - Defines the mathematical expression for the green channel.
  
• Blue - Defines the mathematical expression for the blue channel.
  

Use the to to edit the expression for the specific channel by using the Maths Expression Editor.

Note: The expressions are not validated by the Sentinel Toolbox, keep care of using the correct syntax.
Please refer to the Maths Expression Editor documentation for the syntax and capablities of expressions.

Write Options

This preference page is used to edit the writing behaviour of SNAP.

The first four entries are only relevant when products are saved in BEAM-DIMAP format.

• Save product header (MPH, SPH)
  This options allows you to include/exclude the main product header (MPH) and specific product header (SPH) of ENVISAT products in/from the file being saved. If this option is selected, the Sentinel Toolbox stores the MPH and SPH as meta-data in the BEAM-DIMAP (XML) header.
  It is recommended to always include this meta data.
• Save product history (History)
  This option switches the saving of the processing history of the product on or off. It is recommended to always include this meta data to be able to track the processing stages and the original product.
• Save product annotation data sets (ADS)
  This options allows you to include/exclude all annotation data sets (ADS) of ENVISAT products in/from the file being saved. If this option is selected, The Sentinel Toolbox stores ADS as meta-data in the BEAM-DIMAP (XML) header.
  For ENVISAT products, location and annotation data sets (provided at tie-points) need not to be stored as meta data, since the Sentinel Toolbox automatically converts them into tie point grids, which are separately saved.
• Use incremental Save
  If this option is selected (recommended), the Sentinel Toolbox will only save the modifications applied to a product, such as band modified or created with band maths tool or the removal of bands.
• Enable DIMAP write cache
  If this option is selected (recommended), all data written to DIMAP file format will be cached before accessing the storage medium. This allows for a disk access schema suited for the dataformat and thus in most cases a higher data throughput.

The last element generally concerns the writing process and thus also all writeable formats.

• Write raster data concurrently
  If this option is selected (recommended), the write operation uses the processor cores in parallel to write raster data. This can dramatically speed up the write process. However, it can also cause problems if the writer is not implemented thread save.
  If the data cannot be written in parallel, please disable this option.

New Masks

This preference page is used to edit the default mask overlay colour and its transparency.

• Default mask overlay colour - Sets the default colour for newly created masks. Select a colour from a pre-defined list or customize it.
  
• Default mask overlay transparency - Sets the default transparency for newly created masks. Enter a value between 0 and 1. 0 means opaque, 1 means transparent.
  

Quicklooks

• Save quicklooks with product where possible - Specify whether SNAP shall save a quicklook with the product.
  
• Max quicklook width in pixels - Set maximum width of quicklook image.
  

Tool Adapter

• Validate tool paths and variables on save - Explanatory text.
  
• Display warning when source products are missing - Explanatory text.
  
• Display execution output - Explanatory text.
  
• Use autocomplete of parameters for template editing [experimental] - Explanatory text.
  

World View

• Use flat Earth projection - Explanatory text.
  

GPF

• Beep when processing has finished - Generate a system feedback after processing.
  

Remote File Repositories

Put content here.

Product Library

Put content here.

GDAL Library Loader configuration

It is possible to configure the GDAL library loader to load one of the installed GDAL distribution from the operating system or the internal GDAL distribution within SNAP (version 3.2.1).

The internal GDAL distribution is used when no GDAL distribution is installed on the operating system or when the installed version is not compatible. If the first option is selected and a GDAL distribution is installed on the operating system, SNAP will not load it until the second option is selected.

Compatible versions

- Windows x86 (32 bit): from GDAL 2.1.X to GDAL 3.2.X
- Windows x64 (64 bit): from GDAL 2.1.X to GDAL 3.2.X
- Linux x64 (64 bit): from GDAL 2.0.X to GDAL 3.2.X
- MacOSX (64 bit): from GDAL 2.0.X to GDAL 3.2.X

Other

• Release check interval - Specify when a check for a new SNAP release shall be performed. Available options are:

Layer Settings

Graticule Layer

This preferences page provides options to customize the Graticule Overlay.

You can find a detailed description here.

Image Layer

• Background colour - Select the background colour of the image view from a pre-defined list or customize it.
  
• Show image border - Draw a border around the image view.
  
• Image border size - Specify the image border size in pixels.
  
• Image border colour - Select a colour from a pre-defined list or customize it.
  
• Show pixel borders in magnified views - Draw a border around pixels when zoomed in.
  
• Pixel border size - Specify the pixel border size in pixels.
  
• Pixel border colour - Select a colour from a pre-defined list or customize it.
  

No-Data Layer

This preferences page provides options to customize the No-Data Overlay.

• No-data overlay colour - Sets the fill colour of the No-Data Overlay. Select the no-data overlay colour from a pre-defined list or customize it.
  
• No-data overlay transparency - Sets the transparency of the No-Data Overlay. Enter a value between 0 and 1. 0 means opaque, 1 means transparent.
  

World Map Layer

• World Map Layer - Select the layer type from a list. Available options:

Performance Settings

This preferences page contains settings for the Java VM and processing parameters. Both settings might be computed by SNAP or being reset to default values.

• VM Parameters - Please refer to Java HotSpot VM Options .
  
• Cache path - Path to the SNAP cache directory.
  
• Cache Size (MB) - Maximum size of the SNAP cache directory.
  
  
• Tile size (px) - Explanatory text.
  
• Number of Threads - Explanatory text.
  
• Benchmark operator - Explanatory text.
  

WWW Settings

• Web Browser - Select your preferred web browser for displaying content. Choose between either the system default or a specific browser app.
  
• Proxy settings - Specify your proxy settings if needed..
  
• • No Proxy - Disable proxies
  • Use System Proxy Settings - Reload proxy settings defined in your system configuration.
  • Manual Proxy Settings - Enter manual proxy settings. Clicking on brings up the Advanced Proxy Settings dialog below.
• Test connection - Checks whether the proxy settings are valid.

Advanced Proxy Settings

If you are behind a proxy you should configure your settings here.
You are able to configure the settings for different protocols or check the box to use the same settings for all protocols.

• HTTP Proxy - Enter the HTTP proxy server address and the port.
• HTTPS Proxy - Enter the HTTPS proxy server address and the port.
• SOCKS Proxy - Enter the SOCKS proxy server address and the port.
• Use HTTP proxy authentication
  If your proxy requires authentication enable this option.
• User name:
  Your user name.
• Password:
  Your password.

Keymap Settings

In this preference page you are able to change or create keystrokes for actions within SNAP. Keymap settings can be edited, stored and managed with this dialog.

Appearance Settings

• New document opens next to active document tab - New tabs are arranged next to the active tab.
  
• Close activates most recent document - When a document is closed then the most recent document becomes active instead of its neighbor.
  
• Tab placement - Define where tabs are displayed: at top, left, bottom or right of the image view.
  
• Multi-row tabs - Specify whether tabs shall be displayed in more than one row.
  
  • Maximum row count - Specify the number of rows allowed, e.g. 3. See image below.
• Show parent folder name in tab title - Display parent folder name in tab.
  
• Show full file path - Specify the full path in tab.
  

Windows

• Drag window image - Enables "ghost" window image during drag and drop of a window.
  
• Transparent drag window image - Enables transparency in drag window image.
  
• Snapping floating windows - Enables automatic snapping of floating windows for easier layout handling.
  
• Snap to screen edges - Enables snapping of floating windows to screen edges.
  
• Transparent floating windows - Makes unfocused floating windows semi-transparent after a few seconds.
  

Look and Feel

• Preferred look and feel - Select your favourite look-and-feel from a list. Note that the activation requires a restart of SNAP.
  
• Maximize use of native look and feel - NetBeans uses native UI components when those offer sufficient functionality. Select this option to force the use of native components, even when that may limit functionality (e.g. macOS file chooser).