Magnetic Calculator (Production Mapping)

Zusammenfassung

Computes the magnetic field at point locations for a date you specify. You must provide an altitude or specify a field of type double in your data that contains altitude data. The date must be between 1/1/2005 and 12/31/2014. The magnetic value is calculated using the World Magnetic Model.

Verwendung

Syntax

MagneticCalculator_production (in_feature_class, {in_SQL_Set}, in_linear_Unit, in_altitude, in_date, {output_feature_class}, {in_output_declination_field}, {in_output_annual_drift_field}, {in_output_inclination_field}, {in_output_horizontal_field}, {in_output_east_component_field}, {in_output_north_component_field}, {in_output_vertical_intensity_field}, {in_output_total_intensity_field}, {in_output_grid_variation_field})
ParameterErläuterungDatentyp
in_feature_class

The point features for which you want to calculate magnetic field values.

Feature Layer
in_SQL_Set
(optional)

A Structured Query Language (SQL) where clause that filters input_feature_class features based on attribute values.

SQL Expression
in_linear_Unit

The linear unit of measurement to use for in_altitude. Linear units include CENTIMETERS | DECIMAL DEGREES | DECIMETERS | FEET | INCHES | KILOMETERS | METERS | MILES | MILLIMETERS | NAUTICAL MILES | POINTS | UNKNOWN | YARDS.

String
in_altitude

Specifies an altitude value or field to use to calculate a point's magnetic field. If you specify a value, the tool applies that value to all points during the calculation. If you specify a field, the tool uses each point's value from that field during calculation. The tool only accepts double type fields. The default value is 0.

Double;Field
in_date

The date for which you want magnetic field values to be calculated. The date must be between 1/1/2005 and 12/31/2014. Type the date in MM/DD/YYYY format. The default value is the system current date.

Date
output_feature_class
(optional)

The path to and name of a new feature class that will store the calculated magnetic field values. To overwrite Input_Feature_Class, set this parameter to an empty string ("") and specify at least one of the output field parameters.

Feature Class
in_output_declination_field
(optional)

The name of the field that will store magnetic declination angle values. The declination angle is the angle between magnetic north and true north. It varies by location on the globe.

String
in_output_annual_drift_field
(optional)

The name of the field that will store annual drift values. Annual drift is the average change in a year in magnetic declination due to changes in currents in the earth's core. Annual drift varies based on your location on the globe.

String
in_output_inclination_field
(optional)

The name of the field that will store inclination values. Inclination is the angle between a compass needle and the plane of the horizon; it changes as you change latitude. This is also known as magnetic dip or the dip of the compass needle.

String
in_output_horizontal_field
(optional)

The name of the field that will store magnetic field horizontal strength values. This is also known as horizontal intensity, or H. Horizontal strength is determined using north and east components. Horizontal strength varies based on your location on the globe.

String
in_output_east_component_field
(optional)

The name of the field that will store east component values. The east component is the easterly intensity of the geomagnetic field and is also known as Y. This value varies by location on the globe.

String
in_output_north_component_field
(optional)

The name of the field that will store north component values. The north component is the northerly intensity of the geomagnetic field and is also known as X. This value varies by location on the globe.

String
in_output_vertical_intensity_field
(optional)

The name of the field that will store vertical strength values. Vertical Component is the vertical intensity of the geomagnetic field and is also known as Z. This value varies by location on the globe.

String
in_output_total_intensity_field
(optional)

The name of the field that will store the calculated total strength of the magnetic field. Total intensity, also known as F, is calculated using horizontal and vertical components. This value varies by location on the globe.

String
in_output_grid_variation_field
(optional)

The name of the field that will store grid variation values. Grid variation is the angle between magnetic north and grid north. This calculation requires you to use the Lambert Conformal Conic projected coordinate system in the ArcMap data frame, geoprocessing environment, or in the Input_Feature_Class.

String

Codebeispiel

MagneticCalculator example (Python window)

The following ArcGIS Python window example demonstrates how to use the MagneticCalculator function with Production Mapping sample data. Execute this code from ArcMap or ArcCatalog. Enable the Production Mapping extension first. The code creates an output feature class with Elev features that have a zv2 value less than 500. It also adds and populates a declination and annual drift field.

arcpy.MakeFeatureLayer_management(r'C:\data\SoCal.gdb\SoCal\ElevP',"elevs_less_500","zv2<500")
# import the production mapping toolbox - you may have to alter this path
arcpy.ImportToolbox('C:/Program Files/ArcGIS/Desktop10.0/ArcToolbox/Toolboxes/Production Mapping Tools.tbx')
outFc = "c:/data/magnetic.gdb/MagneticCalc"
arcpy.MagneticCalculator_production("elevs_less_500", "", "Feet", "100", "3/29/2010", outFc,"declination","annualdrift")

Umgebungen

Verwandte Themen

Lizenzinformationen

ArcView: Erfordert Production Mapping
ArcEditor: Erfordert Production Mapping
ArcInfo: Erfordert Production Mapping

9/17/2010