From the Rectification Control Points module in GTK+ GRASS the user can edit and manually enter control points.
Rectification Control Points
From this menu the user can:
- Turn control points on or off.
- Highlight the selected control point on the display.
- Check the Root Mean Square (RMS) error for the selected points.
- Manually enter known control points.
- Automatically project manually entered geographic coordinates to the users coordinate system (e.g. UTM).
This is a useful option for selecting geographic graticules on scanned maps.
The control points can be saved to a re-loadable XML points file. The XML file includes the image name, location and format, plus the complete list of control points. Using this format the image and control points can be easily re-loaded in a single step. The following is a sample control points XML file …
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The GTK+ GRASS Interface uses a simple XML interface to save the 3D state, keyframe animations, and run scripts.
XML State File
The 3D View module uses a simple XML format to save and load the 3D state. Supported fields include view position, lighting, and loaded GRASS objects (eg. raster). A sample script might look like the following:
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Plots created with Profile Plotter can be saved and reloaded at a future time. The plots are saved as a simple XML file that contains all the settings needed to re-create the plot. Instead of re-loading multiple data files and customizing the display, the user simply reloads a previously saved XML plot file.
Multiple Profiles at Same Size
The XML plot file does not contain the plot data, but rather a link to the original ASCII data.
Saving a plot to an XML file allows for easy creation of multiple plot images with identical parameters (i.e. width, height, annotation). The example on the right shows a sequence of profiles across an ice scour. The profiles are all the same size (scale) allowing for easy comparison.
