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uniDEM Data Manipulation

uniDEM supports reprojection, mosaicking of DEM editing along with undo, redo and reverting of edits performed on a DEM. Additionally, a detailed edit history can be retrieved for every pixel in an active dataset.

Undo

The undo feature can be used to undo edits that were performed when making selections, classifications, editing DEMs or collecting geometries.

Default shortcut: Ctrl-Z

Redo

The redo feature can be used to redo edits that were undone after making selections, classifications, editing DEMs or collecting geometries.

Default shortcut: Ctrl-Y

Revert

The revert feature can be used to return a DEM to it's original incoming values. When a DEM is set as the active dataset a backup file is with the DEM file name and a "~" is created (ex. SomeDEM.tif~). This holds the original DEM data.

Default shortcut: none

Reproject

Reproject allows the projection of a raster or geometry to be changed.

The projection can be selected from a drop-down menu or the EPSG code can be entered directly by selecting Other in the drop-down.

Default shortcut: none

Move

Move provides a lightweight method to assign a new projection and coordinates to a DEM or Image raster. This feature can be used for a tif that is received without geocoding or complete projection information.
Note: This feature requires knowledge of the corresponding pixel location of a given tie point.

To move a dataset 3 locations and the corresponding pixel locations are required.
The following steps are performed:

  1. Select the dataset that will be moved
  2. Select the data layer that will be moved
  3. Select the desired projection
  4. Enter the pixel location of the first coordinate
  5. Enter the spatial location of the pixel in the selected EPSG projection
  6. Enter a second pixel location for the second coordinate
  7. Enter the second spatial location of the pixel in the selected EPSG projection
  8. Enter a third pixel location for the third coordinate
  9. Enter the third spatial location of the pixel in the selected EPSG projection

Default shortcut: none

Mosaic

The Mosaic tool supports merging of one or more rasters of the same kind into one raster within the defined selection.

Default shortcut: none

History

uniDEM maintains a detailed history of edits performed on an active dataset in the .history file which is appended to the name of the layer that is edited. The history file records all of the actions that change the value of a raster such as interpolating a void or setting one or more pixels to new elevations.

History files values can be used to generate edit masks for the entire dataset or to inspect every operation that was performed on a single pixel.

Default shortcut: none