Extract Multi Values to Points (Spatial Analyst)
Summary
Extracts cell values at locations specified in a point feature class from one or more rasters, and records the values to the attribute table of the point feature class.
Usage
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Any combination of rasters (single band or multiband) can be specified as input.
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A cell value will be extracted for each input raster and a new field containing the cell values for each input raster are appended to the input point feature class.
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Output field names are created from the name of the input raster by default. Otherwise you can specify a unique name for each field to store raster values.
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When the input is a multiband raster, a field will be added for all bands with a "b1_, b2_, …bn" prefix added to the name of the output field denoting the band number.
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The interpolation option determines how the values will be obtained from the raster. The default option is to use the value at the center of the cell being sampled. The interpolation option will use bilinear interpolation to interpolate a value for the cell center.
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Shapefile formats have a field limitation of maximum 10 characters in length. Output fields appended to input shapefile will be truncated and made unique by default. This may make it hard to distinguish between input rasters if the names are long or very similar. In this case it is suggested to convert the features to a file geodatabase.
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NoData cells in the value raster will be given a NULL Value. For shapefiles, NULL is not supported and a value of 0 (zero) will be given.
Caution:This tool modifies the input data. See Tools with no outputs for more information and strategies to avoid undesired data modification.
Syntax
| Parameter | Explanation | Data Type |
in_point_features |
The input point features to which you want to add raster values. | Feature Layer |
in_rasters [[Raster, {Output Field Name}],...] |
The input raster (or rasters) values you want to extract based on the input point feature location. Optionally, you can supply the name for the field to store the raster value. By default, a unique field name will be created based on the input raster dataset name. | Value Table |
bilinear_interpolate_values (Optional) |
Specifies whether or not interpolation will be used.
| Boolean |
Code Sample
Extract the cell values from multiple rasters to attributes in a point shapefile feature class.
import arcpy
from arcpy.sa import *
from arcpy import env
env.workspace = "c:/sapyexamples/data"
ExtractMultiValuesToPoints("observers.shp", [["elevation", "ELEV"],
["costraster", "COST"], ["flowdir", "DIR"]], "NONE")
Extract the cell values from multiple rasters to attributes in a point shapefile feature class using interpolation.
# Name: ExtractMultiValuesToPoints_Ex_02.py
# Description: Extracts the cells of multiple rasters as attributes in
# an output point feature class. This example takes a multiband IMG
# and two GRID files as input.
# Requirements: Spatial Analyst Extension
# Author: ESRI
# Import system modules
import arcpy
from arcpy import env
from arcpy.sa import *
# Set environment settings
env.workspace = "C:/sapyexamples/data"
# Set local variables
inPointFeatures = "poi.shp"
inRasterList = [["doqq.img", "doqqval"], ["redstd", "focalstd"],
["redmin", "focalmin"]]
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Execute ExtractValuesToPoints
ExtractMultiValuesToPoints(inPointFeatures, inRasterList, "BILINEAR")