bounds
Syntax
Description
Examples
Calculate Bounds of Shape in Geographic Coordinates
Calculate the bounds of shapes in geographic coordinates. When you pass geographic shapes to the bounds
function, the function calculates latitude and longitude limits.
Read a shapefile of US states into the workspace as a geospatial table. The table represents the states using polygon shapes in geographic coordinates. Extract the polygon shapes.
states = readgeotable("usastatehi.shp");
geoshp = states.Shape
geoshp=51×1 geopolyshape array with properties:
NumRegions: [51x1 double]
NumHoles: [51x1 double]
Geometry: "polygon"
CoordinateSystemType: "geographic"
GeographicCRS: [1x1 geocrs]
⋮
Find the bounds of each polygon shape. By default, the function returns a set of latitude and longitude limits for each shape object.
[latlim,lonlim] = bounds(geoshp);
Store the latitude and longitude limits in the geospatial table by creating new table variables.
states.LatitudeLimits = latlim; states.LongitudeLimits = lonlim;
View the first eight rows of the table. Note that each shape object has a corresponding set of latitude and longitude limits.
head(states)
Shape Name LabelLat LabelLon LatitudeLimits LongitudeLimits ____________ _____________ ________ ________ ________________ __________________ geopolyshape "Alabama" 32.283 -86.921 30.221 35.008 -88.473 -84.889 geopolyshape "Alaska" 64.61 -152.46 51.217 71.333 -187.54 -130.03 geopolyshape "Arizona" 34.345 -112.07 31.332 37.004 -114.81 -109.04 geopolyshape "Arkansas" 34.835 -91.886 33.004 36.499 -94.618 -89.645 geopolyshape "California" 36.822 -119.66 32.535 42.01 -124.41 -114.13 geopolyshape "Colorado" 39.03 -105.54 36.992 41.003 -109.06 -102.04 geopolyshape "Connecticut" 41.511 -72.763 40.986 42.05 -73.728 -71.787 geopolyshape "Delaware" 39.107 -75.494 38.452 39.838 -75.789 -75.049
Calculate Bounds of Shape in Planar Coordinates
Calculate the bounds of shapes in planar coordinates. When you pass planar shapes to the bounds
function, the function calculates xy-limits.
Read hydrography data for an area in Concord, MA as a geospatial table. The table represents the states using polygon shapes in planar coordinates. Extract the polygon shapes.
hydro = readgeotable("concord_hydro_area.shp");
mapshp = hydro.Shape
mapshp=98×1 mappolyshape array with properties:
NumRegions: [98x1 double]
NumHoles: [98x1 double]
Geometry: "polygon"
CoordinateSystemType: "planar"
ProjectedCRS: [1x1 projcrs]
⋮
Find the bounds of each polygon shape. By default, the function returns a set of xy-limits for each shape object.
[xlimits,ylimits] = bounds(mapshp);
Store the xy-limits in the geospatial table by creating new table variables.
hydro.XLimits = xlimits; hydro.YLimits = ylimits;
View the first eight rows of the table. Note that each shape object has a corresponding set of xy-limits.
head(hydro)
Shape AREA PERIMETER XLimits YLimits ____________ __________ _________ ________________________ ________________________ mappolyshape 2456.4 289.22 2.0759e+05 2.0763e+05 9.1336e+05 9.1349e+05 mappolyshape 1.2685e+05 11264 2.0748e+05 2.1032e+05 9.1101e+05 9.1344e+05 mappolyshape 2075.4 207.37 2.0763e+05 2.0767e+05 9.1321e+05 9.133e+05 mappolyshape 814.05 117.55 2.0927e+05 2.0931e+05 9.1325e+05 9.1329e+05 mappolyshape 10754 633.93 2.0861e+05 2.0882e+05 9.1309e+05 9.1326e+05 mappolyshape 5894.2 370.54 2.1023e+05 2.1032e+05 9.1309e+05 9.1323e+05 mappolyshape 48368 3378.7 2.0657e+05 2.0743e+05 9.1241e+05 9.1318e+05 mappolyshape 27673 1650.6 2.0707e+05 2.0746e+05 9.1272e+05 9.1318e+05
Calculate Bounds Over All Shapes
By default, when you pass multiple shapes to the bounds
function, the function calculates a set of bounds for each shape object. Calculate the bounds over all the shapes by using the "all"
option.
Read a shapefile containing the coordinates of locations in Boston as a geospatial table. The table represents the locations using point shapes in geographic coordinates. Extract the point shapes.
places = readgeotable("boston_placenames.gpx");
geoshp = places.Shape
geoshp = 13x1 geopointshape array with properties: NumPoints: [13x1 double] Latitude: [13x1 double] Longitude: [13x1 double] Geometry: "point" CoordinateSystemType: "geographic" GeographicCRS: [1x1 geocrs]
Find the bounds over all the point shapes.
[latlim,lonlim] = bounds(geoshp,"all")
latlim = 1×2
42.3459 42.3668
lonlim = 1×2
-71.0995 -71.0495
Input Arguments
geoshp
— Shape in geographic coordinates
geopointshape
, geolineshape
, or
geopolyshape
object | vector of geopointshape
, geolineshape
, or
geopolyshape
objects
Shape in geographic coordinates, specified as a geopointshape
,
geolineshape
, or
geopolyshape
object or as a vector of geopointshape
, geolineshape
,
or geopolyshape
objects. When you specify an array, you can include a
combination of point, line, and polygon shape objects.
mapshp
— Shape in planar coordinates
mappointshape
, maplineshape
, or
mappolyshape
object | vector of mappointshape
, maplineshape
, or
mappolyshape
objects
Shape in geographic coordinates, specified as a mappointshape
,
maplineshape
, or
mappolyshape
object or as a vector of mappointshape
, maplineshape
,
or mappolyshape
objects. When you specify an array, you can include a
combination of point, line, and polygon shape objects.
Output Arguments
latlim
— Latitude limits
two-column matrix
Latitude limits, returned as a two-column matrix. The first column of the matrix contains the northern latitude limits, and the second column of the matrix contains the southern latitude limits. For each row of the matrix, the first limit is less than or equal to the second limit.
When you do not specify the "all"
option, the number of rows in
the matrix matches the number of shapes in geoshp
. When you do
specify the "all"
option, the matrix has one row.
The units of latlim
match the units of
geoshp
. If the GeographicCRS
property of
geoshp
contains a geocrs
object,
you can find the units by querying the AngleUnit
property of the
geocrs
object, for example
geoshp.GeographicCRS.AngleUnit
.
lonlim
— Longitude limits
two-column matrix
Longitude limits, returned as a two-column matrix. The first column of the matrix contains the western longitude limits, and the second column of the matrix contains the eastern longitude limits. For each row of the matrix, the first limit is less than or equal to the second limit.
When you do not specify the "all"
option, the number of rows in
the matrix matches the number of shapes in geoshp
. When you do
specify the "all"
option, the matrix has one row.
The units of lonlim
match the units of
geoshp
. If the GeographicCRS
property of
geoshp
contains a geocrs
object,
you can find the units by querying the AngleUnit
property of the
geocrs
object, for example
geoshp.GeographicCRS.AngleUnit
.
xlimits
— x-limits
two-column matrix
x-limits, returned as a two-column matrix. The first column of the matrix contains the lower x-limits, and the second column of the matrix contains the upper x-limits. For each row of the matrix, the first limit is less than or equal to the second limit.
When you do not specify the "all"
option, the number of rows in
the matrix matches the number of shapes in mapshp
. When you do
specify the "all"
option, the matrix has one row.
The units of xlimits
match the units of
mapshp
. If the ProjectedCRS
property of
mapshp
contains a projcrs
object,
you can find the units by querying the LengthUnit
property of the
projcrs
object, for example
mapshp.ProjectedCRS.LengthUnit
.
ylimits
— y-limits
two-column matrix
y-limits, returned as a two-column matrix. The first column of the matrix contains the lower y-limits, and the second column of the matrix contains the upper y-limits. For each row of the matrix, the first limit is less than or equal to the second limit.
When you do not specify the "all"
option, the number of rows in
the matrix matches the number of shapes in mapshp
. When you do
specify the "all"
option, the matrix has one row.
The units of ylimits
match the units of
mapshp
. If the ProjectedCRS
property of
mapshp
contains a projcrs
object,
you can find the units by querying the LengthUnit
property of the
projcrs
object, for example
mapshp.ProjectedCRS.LengthUnit
.
Version History
Introduced in R2024b
See Also
Functions
Objects
Topics
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