# Geometric

## Resumen

Creates a raster object by producing an orthorectified image using a sensor definition and terrain model.

## Debate

You can use this function when your raster data has rational polynomial coefficients.

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

## Sintaxis

`Geometric (raster, {geodata_transforms}, {append_geodata_xform}, {z_factor}, {z_offset}, {constant_z}, {correct_geoid}, {tolerance}, {dem})`
 Parámetro Explicación Tipo de datos raster The input raster. Raster geodata_transforms The transformation method for the geometric function. Transformation methods include Polynomial, Projective, or Identity.(El valor predeterminado es None) String append_geodata_xform Specifies whether to append the geodata transform to the input raster.True—The geodata transform will be appended to the input raster.False—The geodata transform will not be appended to the input raster.(El valor predeterminado es False) Boolean z_factor The z-factor value to rescale to meters, if the input elevation dataset uses vertical units other than meters.(El valor predeterminado es None) Double z_offset The base value to be added to the elevation values in the DEM. Use this argument to offset elevation values that do not start at sea level.(El valor predeterminado es None) Double constant_z A constant elevation value to use for the function.(El valor predeterminado es None) Double correct_geoid The geoid correction converts orthometric heights using a geoid before applying an orthorectification to your imagery.Most elevation datasets, such as USGS NED or ArcGIS Online World elevation, use orthometric heights, so it is necessary to select the Geoid correction for compatibility with satellite RPCs, which require ellipsoidal heights.True—Apply the geoid (EGM96) correction to the z-values.False—Do not apply the geoid correction to the z-values.(El valor predeterminado es False) Boolean tolerance The maximum tolerable error in the geometric function, given in number of pixels.(El valor predeterminado es None) Double dem The DEM used to orthorectify the raster dataset.(El valor predeterminado es None) Raster
Valor de retorno
 Tipo de datos Explicación Raster The output raster.

## Muestra de código

Geometric example

Orthorectifies a satellite image using a sensor model and a DEM.

``````# Import system modules
import arcpy
from arcpy.ia import *

# Set the local variables
raster = "C:/data/Image.JPG"
geodata_transforms = "Polynomial"
append_geodata_xform = True
z_factor = None
z_offset = None
constant_z = None
correct_geoid = False
tolerance = 2
dem = "C:/data/DEM.tif"

# Apply RegionGrow function
Orthorectified_raster = arcpy.ia.Geometric(raster, geodata_transforms, append_geodata_xform,
z_factor, z_offset, constant_z, correct_geoid,
tolerance, dem)

# Save the output
Orthorectified_raster.save("C:/arcpyExamples/outputs/Image_ortho.JPG")``````