# mappointshape

Point shape in planar coordinates

## Description

A `mappointshape`

object represents a point or multipoint in planar
coordinates. A *multipoint* is an individual point shape that contains a
set of point locations.

To represent a point or multipoint in geographic coordinates, use a `geopointshape`

object
instead.

## Creation

To create `mappointshape`

objects, either:

Import point data in planar coordinates as a geospatial table using the

`readgeotable`

function, and then query the`Shape`

variable of the table.Use the

`mappointshape`

function (described here).

### Description

### Input Arguments

`x`

— *x*-coordinates

numeric array | cell array of numeric arrays

*x*-coordinates, specified as a numeric array or a cell array of
numeric arrays.

Create a point by specifying a scalar, such as

`39`

.Create a multipoint by specifying an array within a cell, such as

`{[38 -30 29]}`

.Create an array of points by specifying an array, such as

`[38 -30 29]`

.Create an array of points and multipoints by specifying a cell array of numeric arrays, such as

`{39,[38 -30 29]}`

.

Create placeholders for points with missing data by including
`NaN`

values. The `NaN`

values in
`x`

must correspond to the `NaN`

values in
`y`

.

The size of `x`

must match the size of `y`

.
For cell arrays, the size of the array in each cell of `x`

must
match the size of the array in the corresponding cell of
`y`

.

**Data Types: **`double`

| `cell`

`y`

— *y*-coordinates

numeric array | cell array of numeric arrays

*y*-coordinates, specified as a numeric array or a cell array of
numeric arrays.

Create a point by specifying a scalar, such as

`-113`

.Create a multipoint by specifying an array within a cell, such as

`{[-66 -31 42]}`

.Create an array of points by specifying an array, such as

`[-66 -31 42]`

.Create an array of points and multipoints by specifying a cell array of numeric arrays, such as

`{-113,[-66 -31 42]}`

.

Create placeholders for points with missing data by including
`NaN`

values. The `NaN`

values in
`x`

must correspond to the `NaN`

values in
`y`

.

The size of `x`

must match the size of `y`

.
For cell arrays, the size of the array in each cell of `x`

must
match the size of the array in the corresponding cell of
`y`

.

**Data Types: **`double`

| `cell`

## Properties

`NumPoints`

— Number of points

array of nonnegative integers

This property is read-only.

Number of points, returned as an array of nonnegative integers.

For a `mappointshape`

scalar, the value of
`NumPoints`

is `1`

when the
`mappointshape`

object represents a single point and more than
`1`

when the object represents a multipoint.

For a `mappointshape`

array, the size of
`NumPoints`

matches the size of the array.

**Data Types: **`double`

`X`

— *x*-coordinates

array

*x*-coordinates, specified as an array.

For a `mappointshape`

scalar, the size of `X`

matches the value of `NumPoints`

.

For a `mappointshape`

array, the size of `X`

matches the size of `NumPoints`

. If the array contains
`mappointshape`

objects with multipoints, then accessing the
`X`

property of the array is not supported. Instead, access the
`X`

property of individual objects within the array. You can
determine whether a `mappointshape`

array contains multipoints by using
the `ismultipoint`

function.

This property is read-only for arrays when any element of
`NumPoints`

is greater than `1`

.

`X`

and `Y`

must be the same size.

**Data Types: **`double`

`Y`

— *y*-coordinates

array

*y*-coordinates, specified as an array.

For a `mappointshape`

scalar, the size of `Y`

matches the value of `NumPoints`

.

For a `mappointshape`

array, the size of `Y`

matches the size of `NumPoints`

. If the array contains
`mappointshape`

objects with multipoints, then accessing the
`Y`

property of the array is not supported. Instead, access the
`Y`

property of individual objects within the array. You can
determine whether a `mappointshape`

array contains multipoints by using
the `ismultipoint`

function.

This property is read-only for arrays when any element of
`NumPoints`

is greater than `1`

.

`X`

and `Y`

must be the same size.

**Data Types: **`double`

`Geometry`

— Geometric type

`"point"`

(default)

This property is read-only.

Geometric type, returned as `"point"`

.

**Data Types: **`string`

`CoordinateSystemType`

— Coordinate system type

`"planar"`

(default)

This property is read-only.

Coordinate system type, returned as `"planar"`

.

**Data Types: **`string`

`ProjectedCRS`

— Projected coordinate reference system

`[]`

(default) | `projcrs`

object

Projected coordinate reference system (CRS), specified as a `projcrs`

object.
A projected CRS consists of a geographic CRS and several parameters that are used to
transform coordinates to and from the geographic CRS.

## Object Functions

`geoplot` | Plot points, lines, and polygons in geographic axes |

`mapclip` | Clip shape to xy-limits in planar coordinates |

`ismultipoint` | Determine which array elements are multipoint shapes |

## Examples

### Get Information about Imported Planar Points

Import a shapefile containing the coordinates of locations in Boston as a geospatial table. The shapefile represents the locations using points. Get information about the points by querying the `Shape`

variable of the table.

```
GT = readgeotable("boston_placenames.shp");
GT.Shape
```

ans = 13×1 mappointshape array with properties: NumPoints: [13×1 double] X: [13×1 double] Y: [13×1 double] Geometry: "point" CoordinateSystemType: "planar" ProjectedCRS: [1×1 projcrs]

Display the locations using black plus signs on a road map.

geoplot(GT,"+k") geobasemap streets

### Create Planar Points and Multipoints

Create an individual point as a `mappointshape`

scalar. Specify the projected CRS as World Equidistant Cylindrical, which has the EPSG authority code `4087`

.

point = mappointshape(-113,39); p = projcrs(4087); point.ProjectedCRS = p

point = mappointshape with properties: NumPoints: 1 X: -113 Y: 39 Geometry: "point" CoordinateSystemType: "planar" ProjectedCRS: [1x1 projcrs]

Create a multipoint as a `mappointshape`

scalar.

multipoint = mappointshape({[-66 -31 42]},{[38 -30 29]}); multipoint.ProjectedCRS = p

multipoint = mappointshape with properties: NumPoints: 3 X: [-66 -31 42] Y: [38 -30 29] Geometry: "point" CoordinateSystemType: "planar" ProjectedCRS: [1x1 projcrs]

Create three individual points as a 1-by-3 `mappointshape`

array.

pointVector = mappointshape([-66 -31 42],[38 -30 29]); pointVector.ProjectedCRS = p

pointVector = 1x3 mappointshape array with properties: NumPoints: [1 1 1] X: [-66 -31 42] Y: [38 -30 29] Geometry: "point" CoordinateSystemType: "planar" ProjectedCRS: [1x1 projcrs]

Create one individual point and one multipoint as a 1-by-2 `mappointshape`

array.

pointMultipoint = mappointshape({-113,[-66 -31 42]},{39, [38 -30 29]}); pointMultipoint.ProjectedCRS = p

pointMultipoint = 1x2 mappointshape array with properties: NumPoints: [1 3] Geometry: "point" CoordinateSystemType: "planar" ProjectedCRS: [1x1 projcrs]

## Version History

**Introduced in R2021b**

### R2022a: Points with missing coordinate data have some changed property values

When a point shape has missing coordinate data, its `NumPoints`

property has a value of `0`

and its `X`

and
`Y`

properties each have a value of `NaN`

.

When you create a point by specifying both coordinates as

`NaN`

values, its`NumPoints`

property has a value of`0`

. In the previous release, the property had a value of`1`

.When a point has no coordinate data, its

`X`

and`Y`

properties each have a value of`NaN`

. In the previous release, the properties were each empty`double`

values.

These changes make it easier to create and access the properties of
`mappointshape`

arrays when the input coordinates contain missing data. For
example, you can now access the coordinates of a `mappointshape`

array when
the array contains a combination of points with coordinate data
(`NumPoints`

is `1`

) and without coordinate data
(`NumPoints`

is `0`

). In the previous release,
MATLAB^{®} issued an error.

## See Also

### Functions

### Objects

### Topics

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