Associate Elevation

ERDAS IMAGINE Help

HGD_Variant
16.5.1
HGD_Product
ERDAS IMAGINE
HGD_Portfolio_Suite
Producer

Category: Photogrammetry

Default

Show All Ports

associatedem_operator

associatedem_operator

Description

The Associate Elevation operator allows you to specify the elevation source for a CoordinateOperation that considers elevation. The output, GeoreferencingOut, is a CoordinateOperation object that includes either a constant elevation or a reference to a elevation (DEM) filename. Associating a DEM with a CoordinateOperation that has a 3D component may improve the accuracy of orthorectification when that CoordinateOperation is used with operators such as Warp and Orthorectify.

A Coordinate Operation contains a mathematical transformation from one coordinate reference system (CRS) to another. The first input, GeoreferencingIn, may be either a CoordinateOperation or a Raster (whose map-to-image CoordinateOperation will be obtained). The CoordinateOperation obtained from the GeoreferencingIn port must have a 3D component. If a ElevationFilename is specified and the GeoreferencingIn port contains a Raster, the boundaries of the input Raster and elevation file must intersect.

If a ElevationFilename is specified, the DEM filename will be set as the elevation source of the CoordinateOperation; otherwise, the elevation source will be set to the constant ConstantElevation. If elevation source is set to the constant ConstantElevation and no ElevationUnits is specified, the units of the constant elevation are assumed to be "meters".

For more information on the DEM file format, see DEM.

Connections

Name

Objects Supported

Required

GeoreferencingIn

Raster, CoordinateOperation

checkmark_gray

ElevationFilename

File

ConstantElevation

Double

ElevationUnits

String

GeoreferencingOut

CoordinateOperation

Syntax

AssociateElevation ( <GeoreferencingIn>[, ElevationFilename=<ElevationFilename>][, ConstantElevation=<ConstantElevation>][, ElevationUnits=<ElevationUnits>] )

Example Model

associateelevation_example