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. 
Nodata 1 Expression 
The expression to be used when no data is found. 
Nodata 2 Expression 
The second expression to be used when no data is found. 
Nodata/nodata Value 
The value assigned to nodata. 
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 anticlockwise 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 commaseparated 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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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 nodata values* 
Should the process use grid cells which have nodata (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. 
Nodata mode* 
Choose from these 3 modes: 1. Nodata cells 2.Nodata cells where all grids' input cells are nodata.or 3. Nodata cells where any grids' input cell is nodata 
Finds the locations and extents of point clusters in twodimensional 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 twodimensional 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 coparameters.
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 dropdown list. 
Use nodata values* 
Use nodata values. True/False. 
Comparator*
TBD
Property 
Value 
Extent type* 
Select from these three extent types: Union, First or Intersection 
Nodata 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 
Nodata mode* 
Select from the three available modes 
TBD
Property 
Value 
Extent type* 
Select from these three extent types: Union, First or Intersection 
Nodata 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 
Nodata 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 
Nodata mode* 
Select from the three available modes 
TBD