Grid (Process operations)

Select Create > Process > Grid.

Multiplies the cell resolution of the first grid by the factor specified by an expression.

Property

Value

Expression*

Enter the required factor as an expression in the text box or in the Expression Builder dialog.

Extent type*

The extent type can be Union, First or Intersection.

No-data 1 Expression

The expression to be used when no data is found.

No-data 2 Expression

The second expression to be used when no data is found.

No-data/no-data Value

The value assigned to no-data.

Creates a Terrain Ruggedness Index map (the average difference in elevation between a Grid cell and each of the surrounding cells) from a Grid.

Creates a Topographic Position Index map (the average difference between the elevation of a Grid cell and the mean of the elevations of each of the surrounding cells) from a Grid.

Creates an Aspect map (the azimuth, or angle, of the slope in a Grid cell) from a Grid.

Properties: The aspect algorithms are: Hom, Zevenbergen & Thorne

Trigonometric*: Should the aspect values be returned as a trigonometric'angle (in degrees anti-clockwise from east/the X axis) instead of an azimuth (in degrees clockwise from north)? True/False.

Creates contour LineString Items from a Grid at fixed intervals.

Property

Value

3D*

Should the LineString Items have their height set to match the contour level? True/False

Interval*:

The interval between contour levels, as a simple value or as an expression.

Offset*:

The offset, relative to 0.0, to apply to the fixed interval contour levels, as a simple value, or as an expression.

Typical contour display:

Creates contour LineString Items from a Grid at fixed levels.

Property

Value

3D*

Should the LineString Items have their height set to match the contour level? True/False

Levels*

The contour levels, as a space- or comma-separated list of values or as a 'repeat string' e.g. '100 200 300' or '100 repeat 3'.

Typical contour display:

Creates a shaded relief map from a Grid. This process is suited to OS LandForm PANORAMA DTMs.

Property

Value

Algorithm*

The slope and aspect algorithms are: Hom, Zevenbergen & Thorne

Altitude*

The altitude of the light, in degrees between 90 (vertical) and 0 (horizontal), as a simple value, or as an expression.

Azimuth*

The azimuth of the light, in degrees clockwise from north, as a simple value, or as an expression.

Combined*

Should the shaded relief map be created using a combination of slope and oblique shading? True/False.

Exaggeration*

The exaggeration factor to apply to vertical values, as a simple value, or as an expression.

Z Ratio*

 The ratio between the vertical units and the horizontal units, as a simple value, or as an expression.

 Typical Hillshade display:

Explodes a Grid Item into one Point Item per Grid cell.

Set Z: Decide if the 'Z' of the Point Items be set to the Grid cell value (in addition to an Item attribute)? True/False.

Creates a coverage of Polygon Items from a Grid.

3D*: Should the LineString Items have their height set to match the height in the Grid? True/False.

Explodes a Grid Item into one Polygon Item per Grid cell.

Set Z: Should the 'Z' of the Polygon Item vertices be set to the Grid cell value (in addition to an Item attribute)? True/False.

Creates a Roughness map (the largest difference in elevation between a Grid cell and those of the surrounding cells) from a Grid.

Creates a grid from point data using the Barnes interpolation method. Click for more information

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using the value of the closest point to each feature.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using the count of features within each grid.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using interpolation.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using Inverse Distance Weighting interpolation. Click here for more information.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Power

A power value smaller than 2 will cause the interpolated values to be dominated by points further away.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using the interpolation of the sum of values within a defined grid.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the sum interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a grid from point data using natural neighbour interpolation which provides a smoother approximation of the results.

Property

Value

Cell size X*

Enter the cell size X.

Cell size Y*

Enter the cell size Y.

Expression

Add an expression to describe the value to be used in the interpolation

Grid form*

Choose form the available Grid forms

Grid pixel type*

The grid pixel type (bit depth) of an image.

Origin X

Enter the grid origin X.

Origin Y

Enter the grid origin Y.

Origin Z

Enter the grid origin Z.

Use no-data values*

Should the process use grid cells which have no-data (null) values? True/False.

Creates a Slope map (the angle, or percentage, of the slope in a Grid cell) from a Grid.

Property

Value

Algorithm*:

The slope algorithm to use- Hom, Zevenbergen & Thorne

Percentage* :

Should the slope values be returned as a percentage instead of an angle? True/False

Z Ratio*

The ratio between the vertical units and the horizontal units, as a simple value, or as an expression, eg '2.54' or '57.296*RadiansToMetres#' (the default value is 1.0)

To divide a grid into smaller cells.

Property

Value

Extent type*

Choose from Union, First or Intersection extent types.

No-data mode*

Choose from these 3 modes: 1. No-data cells 2.No-data cells where all grids' input cells are no-data.or 3. No-data cells where any grids' input cell is no-data

Finds the locations and extents of point clusters in two-dimensional space.

Property

Value

Distance

Distance band or threshold distance (measured in pixels).

Distance method*

Select Euclidian or Manhattan distance measure

Grid pixel type*

Sets the grid pixel type (bit depth) of an image.

Number of neighbours

Enter the number of neighbours or use the Expression Builder to create an expression.

Relationship*

Conceptualization of spatial relationship.

Finds the locations and extents of point clusters in two-dimensional space.

Property

Value

Distance

Distance band or threshold distance (measured in pixels).

Distance method*

Select Euclidian or Manhattan distance measure

Grid pixel type*

Sets the grid pixel type (bit depth) of an image.

Number of neighbours

Enter the number of neighbours or use the Expression Builder to create an expression.

Relationship*

Conceptualization of spatial relationship.

Allows a grid value to be multiplied by a number or expression

Multiplier*: The number to be multiplied by.

Allows a grid value to be added to by a number or expression

Addend*: The number to be added.

Allows a grid value to be subtracted from by a number or expression

Subtrahend*: The number to be subtracted.

Allows a grid value to be divided by a number or expression

Divisor*: The number to be divided by.

Creates a Grid item from the distribution of items using a Kernel Density Estimation (KDE) algorithm.

See also KDE Hot Spot for a full description of the KDE co-parameters.

Property

Value

Bandwidth*

Sets the Bandwidth (in metres).

Cell size X*

Sets the X size of the Grid cells in metres.

Cell size Y*

Sets the Y size of the Grid cells in metres. Cell size is also known as the grid resolution (Resolution property).

Coincident points*

Allows you to select how overlapping points are treated. See KDE Hot Spot - Coincident Point Calculation.

Expression

Grid form*

Choose from the available grid forms

Grid pixel type*

Sets the grid pixel type (bit depth) of an image.

Grid type*

Select the type of Grid to be created. See KDE Hot Spot - Grid type.

Kernel function*

There are nine different kernel functions to select from to create the Grid item. See KDE Hot Spot - Kernel Function. Allows you to specify the X/Y/Z origins.

Units*

Select the required units from the drop-down list.

Use no-data values*

Use no-data values. True/False.

Comparator*

TBD

Property

Value

Extent type*

Select from these three extent types: Union, First or Intersection

No-data mode*

Select from the three available modes

TBD

Comparator*: TBD

TBD

Property

Value

Extent type*

Select from these three extent types: Union, First or Intersection

No-data mode*

Select from the three available modes

TBD

Property

Value

Extent type*

Select from these three extent types: Union, First or Intersection

No-data mode*

Select from the three available modes

Minuend*

The number from which another number is to be subtracted.

Dividend*

The number to be divided by another number.

Sets the value of all Grid cells that match a comparison against the 'from' value to the 'to' value.

Property

Value

'From' value*:

The original value to compare as a single value or as an expression, e.g. '123' or '_AverageGridVal# + 2 * _StdDevGridVal#'.

'To' value*

The new value to use, as a simple value, or as an expression. e.g. '321' or '_NoDataGridVal#'.

Comparison*

The comparison to use when testing the original value.

Sets the grid pixel type (bit depth) of an image.

Grid pixel type*: Select the grid pixel type (bit depth) of an image from.

Subtract one grid from another.

Property

Value

Extent type*

Select from these three extent types: Union, First or Intersection

No-data mode*

Select from the three available modes

Add one grid to another.

Property

Value

Extent type*

Select from these three extent types: Union, First or Intersection

No-data mode*

Select from the three available modes

TBD