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uniDEM Drawing Tools

uniDEM supports drawing of a selection over loaded geospatial data (DEM, images, lidar point clouds) so that operations can be performed on the selected area.

Selections are made by holding the shift key and left mouse button concurrently.

The simplest of selections is the "Select All" feature (Ctrl-A) which will select all pixels of the Active dataset.

Rectangle Drawing Tool

Draw a rectangle that can be subsequently used to select or modify a selection. The rectangle is projected onto the raster independent of heading.
It is created by holding shift and left button on mouse while drawing. Erroneous rectangle can be removed with esc.

Default shortcut: r

Polygon Drawing Tool

Draw a polygon that can be subsequently used to select or modify a selection. The polygon is projected onto the raster independent of heading.
Polygon points are collected by holding shift and then left clicking. The polygon is closed with each point addition.
Erroneous points added to the polygon during collection can be removed with shift and backspace.

Default shortcut: p

Line Drawing Tool

Draw a line that can be subsequently used to select or modify a selection. The line is projected on the raster over its length and orthogonally out to the width defined in Line Width in Drawing Options.
Erroneous points added to the line during collection can be removed with shift + backspace.

Default shortcut: l

Pixel Toggle Tool

Select a pixel by drawing a dot. Toggles the selection of a single pixel to selected or deselected for detailed edits.

Default shortcut: e

Flood Fill Tool

The flood fill tool is used to select areas similar to the first selected pixel of the layer being filled upon.
Filling is started with shift then left click over the seed pixel.
See Fill Options for a description of filling parameters.

Default shortcut: f

Geometry Tool

Manipulate graphs, shapes or other vector data which can be used to flatten features like doulble line drains (DLDs) and roads.

Default shortcut: q

Morph Tool

The Morph tool is used for manipulating terrain interactively. Primarily, this tool is used for constructing structures that were not captured in the original DEM such as dams, small drainages, and other artificial structures.

The morph tool provides three different kernel types:

With each of these kernels, there are four different modes:

Furthermore, parameters for each kernel can be adjusted interactively using the mouse scroll wheel.

Default shortcut: m