worldGrid
Description
[
,
where X
,Y
] = worldGrid(R
,gridOption
)gridOption
is 'gridvectors'
, returns
X
and Y
as row vectors. The coordinates of
raster element (i,j)
are (X(j),Y(i))
. The default for
gridOption
is 'fullgrid'
, which returns
X
and Y
as 2-D arrays.
Examples
Find Coordinates of Raster Elements
Import elevation data, find the coordinates of the imported data, then display the data as a surface.
First import elevation data [1] for an area around Mount Washington as an array and a map cells reference object. Prepare the data for plotting by replacing missing data values with 0
. Then, find the coordinates of each element in the array.
[Z,R] = readgeoraster('MtWashington-ft.grd','OutputType','double'); info = georasterinfo('MtWashington-ft.grd'); Z = standardizeMissing(Z,info.MissingDataIndicator); [X,Y] = worldGrid(R);
Display the elevation data as a surface using an appropriate colormap. Set the EdgeColor
property to 'none'
to remove the mesh from the surface.
surf(X,Y,Z,'EdgeColor','none') demcmap(Z) xlabel('x (meters)') ylabel('y (meters)') zlabel('Elevation (feet)')
[1] The elevation data used in this example is courtesy of the U.S. Geological Survey.
Get Vectors Instead of Arrays
Create a map cells reference object for a 3-by-4 raster with x values in the range [7000, 7400] meters and y values in the range [2700, 3300] meters. Get the coordinates of the raster elements and return them as row vectors.
R = maprefcells([7000 7400],[2700 3300],[3 4]);
[X,Y] = worldGrid(R,'gridvectors')
X = 1×4
7050 7150 7250 7350
Y = 1×3
2800 3000 3200
If you do not specify the second argument as 'gridvectors'
, then the worldGrid
function returns 2-D arrays by default.
[xFull,yFull] = worldGrid(R)
xFull = 3×4
7050 7150 7250 7350
7050 7150 7250 7350
7050 7150 7250 7350
yFull = 3×4
2800 2800 2800 2800
3000 3000 3000 3000
3200 3200 3200 3200
Input Arguments
R
— Spatial reference
MapCellsReference
object | MapPostingsReference
object
Spatial reference, specified as a MapCellsReference
or MapPostingsReference
object.
If R
is a MapCellsReference
object, then
X
and Y
are cell centers. If
R
is a MapPostingsReference
object, then
X
and Y
are posting points.
gridOption
— Grid option
'fullgrid'
(default) | 'gridvectors'
Grid option, specified as one of these values:
'fullgrid'
— ReturnX
andY
as 2-D arrays, where each row ofX
is identical and each column ofY
is identical. This is the default behavior.'gridvectors'
— ReturnX
andY
as row vectors. Use this option when you want to reduce memory usage and when 2-D arrays are unnecessary, such as when plotting large data sets with thesurf
function. You can specifygridOption
as'gridvectors'
only when theTransformationType
property ofR
has a value of'rectilinear'
.
This table shows the difference between 'fullgrid'
and
'gridvectors'
.
'fullgrid' | 'gridvectors' |
---|---|
R = maprefcells([7000 7400],[2700 3300],[3 4]); [X,Y] = worldGrid(R) X = 7050 7150 7250 7350 7050 7150 7250 7350 7050 7150 7250 7350 Y = 2800 2800 2800 2800 3000 3000 3000 3000 3200 3200 3200 3200 |
R = maprefcells([7000 7400],[2700 3300],[3 4]);
[X,Y] = worldGrid(R,'gridvectors') X = 7050 7150 7250 7350 Y = 2800 3000 3200 |
Data Types: char
| string
Output Arguments
X
— x-coordinates
2-D array (default) | row vector
x-coordinates, returned as a 2-D array or a row vector. By
default, X
is a 2-D array. To return X
as a
row vector, specify gridOption
as
'gridvectors'
.
By default, and when gridOption
is
'fullgrid'
, the sizes of X
and
Y
each equal the RasterSize
property of
R
. When gridOption
is
'gridvectors'
, the lengths of X
and
Y
equal the second and first elements of the
RasterSize
property of R
,
respectively.
Y
— y-coordinates
2-D array (default) | row vector
y-coordinates, returned as a 2-D array or a row vector. By
default, Y
is a 2-D array. To return Y
as a
row vector, specify gridOption
as
'gridvectors'
.
By default, and when gridOption
is
'fullgrid'
, the sizes of X
and
Y
each equal the RasterSize
property of
R
. When gridOption
is
'gridvectors'
, the lengths of X
and
Y
equal the second and first elements of the
RasterSize
property of R
,
respectively.
Version History
Introduced in R2021a
See Also
Functions
Objects
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