5.1.11.0 sd.asapgrid.defineImage

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sd.asapgrid.defineImage - Function

5.1.11 Define spatial grid
Description

Define spatial grid.

First two parameters, nx and ny, define number of pixels of the grid. If which of those is not specified, it will be set to the same value as the other. If none of them are specified, it will be determined from map extent and cell size.

Next two parameters, cellx and celly, define size of pixel. You should set those parameters as string, which is constructed numerical value and unit, e.g. ’0.5arcmin’, or numerical value. If those values are specified as numerical value, their units will be assumed to ’arcmin’. If which of those is not specified, it will be set to the same value as the other. If none of them are specified, it will be determined from map extent and number of pixels, or set to ’1arcmin’ if neither nx nor ny is set.

The last parameter, center, define the central coordinate of the grid. You should specify its value as a string, like,

’J2000 05h08m50s -16d23m30s’

’J2000 05:08:50 -16.23.30’

You can omit equinox when you specify center coordinate. In that case, J2000 is assumed. If center is not specified, it will be determined from the observed positions of input data.

Arguments


Inputs
nx	number of pixels along x (R.A.) direction
	allowed:	int
	Default:	-1
ny	number of pixels along y (Dec.) direction
	allowed:	int
	Default:	-1
cellx	size of pixel in x (R.A.) direction
	allowed:	string, float
	Default:	”
celly	size of pixel in y (Dec.) direction.
	allowed:	string, float
	Default:	”
center	central position of the grid
	allowed:	string
	Default:	”

Returns

Example

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