栅格数据

对网格化数据进行地理配准、分析和转换

栅格数据（也称为数据网格）将地图数据以矩阵形式存储。常规数据网格需要一个参考对象来描述数据点的采样和位置。地理定位数据网格明确标识所有行和列的经纬度坐标。

函数

`georefcells`	将参考栅格单元转换为地理坐标
`georefpostings`	将栅格数据与地理坐标关联
`refmatToGeoRasterReference`	Convert referencing matrix to geographic raster reference object
`refvecToGeoRasterReference`	Convert referencing vector to geographic raster reference object
`geoloc2grid`	将带地理定位的数据数组转换为规则数据网格

`geointerp`	地理栅格插值
`georesample`	Resample geographic raster (自 R2025a 起)
`geocrop`	裁剪地理栅格
`georesize`	Resize geographic raster
`mergetiles`	Merge adjacent raster tiles (自 R2024a 起)
`contains`	Determine if geographic or map raster contains points
`geopeaks`	Generate synthetic data set on sphere
`imbedm`	Encode data points into regular data grid
`filterm`	Filter latitudes and longitudes based on underlying data grid
`findm`	Latitudes and longitudes of nonzero data grid elements
`changem`	替换数组中的值
`encodem`	根据初始值和位置填充规则的数据网格

`maprefcells`	将栅格单元关联到地图坐标
`maprefpostings`	将栅格数据与地图坐标关联
`refmatToMapRasterReference`	Convert referencing matrix to map raster reference object

`mapinterp`	平面地图栅格数据的插值
`mapresample`	Resample planar map raster (自 R2025a 起)
`mapcrop`	裁剪平面地图栅格
`mapresize`	Resize planar map raster
`mergetiles`	Merge adjacent raster tiles (自 R2024a 起)
`contains`	Determine if geographic or map raster contains points
`mapoutline`	Outline of georeferenced image or data grid
`changem`	替换数组中的值
`encodem`	根据初始值和位置填充规则的数据网格

`georasterref`	(Not recommended) Create geographic raster reference object
`maprasterref`	(Not recommended) Create map raster reference object
`refmatToWorldFileMatrix`	将参考矩阵转换为世界文件矩阵

`GeographicCellsReference`	将参考栅格单元转换为地理坐标
`GeographicPostingsReference`	Reference raster postings to geographic coordinates
`MapCellsReference`	Reference raster cells to map coordinates
`MapPostingsReference`	Reference raster postings to map coordinates

Raster Geodata
Raster geodata represents map data in matrix format.
Georeferenced Raster Data
Each element of georeferenced raster data corresponds to a defined quadrangle of territory on a planet.

Reference Raster Data Using Geographic or World Limits
When your raster data file does not contain referencing information, you can convert the geographic or world limits of the data into a raster reference object.
Reference Regularly Spaced Raster Data Using Coordinates
Convert raster data represented by regularly-spaced coordinates into an array and a raster reference object. (自 R2026a 起)
Reference Scattered Raster Data Using Interpolation
Convert scattered raster data into an array and a raster reference object by interpolating the data. (自 R2026a 起)
Merge Multiple Raster Tiles Using Datastore
Merge multiple raster tiles from data sets such as DTED, GTOPO30, or GLOBE DEM by using a custom datastore.

Geolocated Data Grids
A geolocated data grid is defined by three matrices giving latitude and longitude coordinates and indices associated with the mapped region.
Geographic Interpretations of Geolocated Grids
The dimensions of a map matrix and associated latitude and longitude matrices determines the interpretation of the geographic map data.

Combine an elevation data grid and an attribute data grid that cover the same region but are gridded differently.

Register an image to an earth coordinate system and create a new georeferenced image (requires Image Processing Toolbox™).

How to convert a USGS DEM into a regular latitude-longitude grid having comparable spatial resolution.