Define Processing Area Dialog

ERDAS IMAGINE Help

HGD_Variant
16.5.1
HGD_Product
ERDAS IMAGINE
HGD_Portfolio_Suite
Producer

Use this dialog to define a processing area in Spatial Modeler. This dialog opens when you double click a Define Processing Area operator that has been placed in the Spatial Model Editor.

Grid

Grid Rule -Grid constraints simultaneously set the cell size and position of pixel centers of Raster Outputs.

Defined by cell size and window - If no grid constraints are used; the cell size is set independently, and pixel centers are placed automatically.

Highest resolution input - Uses the grid of the highest resolution raster input.

Lowest resolution input -Uses the grid of the lowest resolution raster input.

Same as input - Match the grid of a particular Raster Input in the model (both its pixel alignment and its cell size).

Input -Select which of the existing Raster Inputs you want to match.

Align output corner to input corner - Ensures that the output's pixel corners align with the top-left pixel corner (not the pixel center) of the specified input. This specifies an alignment only; the output cell size will depend on the cell size rule.

Input -Select which of the existing Raster Inputs you want to corner-match.

Align output origin to point - Set the point information for grid size.

X - Select the X coordinate to use for alignment.

Y - Select the Y coordinate to use for alignment.

Units - Select the units of the X and Y grid from the list.

Center of Cell - Align the center (not the corner) of the cell to the specified point.

Upper-left corner of cell - Align the upper-left corner (not the center) of the cell to the specified point.

Cell Size

Cell Size Rule - Specify the cell size of the output rasters.

Minimum input - Match the cell size of the highest resolution Raster Input.

Maximum input - Match the cell size of the lowest resolution Raster Input.

Same as input - Match the cell size of a particular Raster Input in the model.

Input -Select which of the existing Raster Inputs you want to match.

Specify - Specify a particular cell size for Raster Outputs.

Width - Specify the width of the cell.

Height - Specify the height of the cell.

Units - Select the units of the width and height cell size from the list. This option is disabled unless Specify is selected under Cell Size Rule.

Square Pixels - When this box is checked, pixel cell size is set automatically to be square.

Window

Window Rule - Select how to determine the geographic extents to use for the raster outputs.

Union of inputs - Use the union area of the Raster Inputs.

Intersection of inputs - Use the intersection area of the Raster Inputs.

Same as input - Use the same extents as a particular Raster Input.

Input -Select which of the existing Raster Inputs you want to match.

Specify - Select a particular region in map or file coordinates for Raster Outputs. When you select this option, you must enter the coordinates below.

Map - Use map coordinates.

File - Click to use file coordinates: pixels starting with 0,0 in the upper-left corner.

From Inquire Box - Define a subset area of the data by using the Inquire Box. When you click this button, the coordinates below are updated with the coordinates of the Inquire Box in the 2D View.

To change these coordinates, you can move or resize the Inquire Box in the 2D View, and then click this button again.

The image you are using and the Inquire Box must already be displayed in a 2D View in order to use the From Inquire Box option. Otherwise, you may manually enter coordinates in the fields below.

UL X - Upper-left X coordinate.

UL Y - Upper-left Y coordinate.

LR XLower-right X coordinate.

LR Y - Lower-right Y coordinate.

Based on

Center of cell - Extentsare calculated and applied based on the coordinates of pixel centers.

Edges of cell - Extents are reckoned by pixel edges, rather than centers.

Coordinate Reference System

CRS Rule - Set how to determine the coordinate reference system for the output rasters.

Default -Set output CRS based on the CRS of the raster inputs (usually choosing the CRS of the first raster input).

Same As input - Use the CRS of a particular Raster Input.

InputSelect which of the existing Raster Inputs you want to match.

Specify - Select a particular CRS using the Coordinate Reference System Chooser.

globe - Set the CRS using the Coordinate Reference System Chooser dialog.