Geometric

Synthèse

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

Discussion

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

For more information about how this function works, see the Geometric raster function.

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

Syntaxe

Geometric (raster, {geodata_transforms}, {append_geodata_xform}, {z_factor}, {z_offset}, {constant_z}, {correct_geoid}, {tolerance}, {dem})

Paramètre	Explication	Type de données
raster	The input raster.	Raster
geodata_transforms	The transformation method for the geometric function. Transformation methods include Polynomial, Projective, or Identity. (La valeur par défaut est 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. (La valeur par défaut est False)	Boolean
z_factor	The z-factor value to rescale to meters, if the input elevation dataset uses vertical units other than meters. (La valeur par défaut est 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. (La valeur par défaut est None)	Double
constant_z	A constant elevation value to use for the function. (La valeur par défaut est 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. (La valeur par défaut est False)	Boolean
tolerance	The maximum tolerable error in the geometric function, given in number of pixels. (La valeur par défaut est None)	Double
dem	The DEM used to orthorectify the raster dataset. (La valeur par défaut est None)	Raster

Valeur renvoyée

Type de données	Explication
Raster	The output raster.

Exemple de code

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")