Automation: Grid Project

The Grid Project feature is now available via automation! The Grids | Edit | Project command creates a new grid in a different coordinate system from a grid in an existing map layer or a grid file. See below for specifications on how to use the new objects and methods in automation:

A new IApplication object (IApplication5) was extended from IApplication4 to include the following new method:

GridProject

Parameter	Type	Required/Optional	Default	Description
InGrid	String	Required	N/A	The filepath of the input grid to be projected.
InCS	String	Optional	InGrid's coordinate system, if specified	The coordinate system of the input grid that is being projected.
OutGrid	String	Optional	"out.grd"	The filepath of the output grid that was projected.
OutFmt	SrfGridFormat	Optional	Surfer 7 Binary Grid	The file extension (or type) for the output grid that was projected.
OutCS	String	Required	N/A	The coordinate system that the input grid will be projected to.
NumRows	Number	Optional	The number of rows in the input grid	The number of rows in the output grid.
NumCols	Number	Optional	The number of columns in the input grid	The number of columns in the output grid.
ResampleMethod	SrfResampleMethod	Optional	srfBilinear	The method we use to determine how the Z values for the output grid willl be calculated.

Syntax
object.GridProject(InGrid:="C:\Users\David\Downloads\input.grd", InCS:="World Geodetic System 1984", OutGrid:="C:\Users\David\Downloads\output.grd", OutFmt:=srfGridFmtS7, OutCS:=WGS72 UTM zone 01N", NumRows:=5, NumCols:=7, ResampleMethod:=srfBilinear)

Remarks
In the UI, there is a "Resize output grid" checkbox. Instead of including another parameter to represent this, resizing the output grid will be false if neither NumRows nor NumCols are specified. If either of NumRows or NumCols is specified, then resizing the output grid will occur.

The InCS and OutCS parameters can be a name, token, or valid WKT for a coordinate system.

Example

Sub Main
	Dim Surfer As Object

	Set Surfer = CreateObject("Surfer.Application")
	Surfer.Visible = True

	'project "Colorado.grd" from it's internal Coordinate System to "Bonne Projection", save to "output.grd"
	Surfer.GridProject(Surfer.Path + "\Samples\Colorado.grd", "Bonne Projection", OutGrid:="C:\Users\David\Downloads\output.grd")

	'project "Grand Canyon.grd" from "World Geodetic System 1972" to "Eckert IV" (using it's token) using the Cubic Convolution resampling method. The output grid with be 124 x 118 and will be saved to "output.vtk"
	Surfer.GridProject(Surfer.Path + "\Samples\Grand Canyon.grd", OutCS:="WORLD_ECKERT4", InCS:="World Geodetic System 1972", NumRows:=124, NumCols:=118, ResampleMethod:=srfCubic, _
	OutGrid:="C:\Users\David\Downloads\output.vtk", OutFmt:=srfGridFmtVTK)
End Sub

Updated January 2021

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