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引用对象、向量或矩阵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`	Reference raster postings to geographic coordinates
`refmatToGeoRasterReference`	Convert referencing matrix to geographic raster reference object
`refvecToGeoRasterReference`	Convert referencing vector to geographic raster reference object
`geoloc2grid`	Convert geolocated data array to regular data grid

`geointerp`	地理栅格插值
`georesample`	Resample geographic raster (自 R2025a 起)
`geocrop`	Crop geographic raster
`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`	Fill in regular data grid from seed values and locations

`maprefcells`	将栅格单元定位应到地图坐标
`maprefpostings`	Reference raster postings to map coordinates
`refmatToMapRasterReference`	Convert referencing matrix to map raster reference object

`mapinterp`	Interpolation for planar map raster
`mapresample`	Resample planar map raster (自 R2025a 起)
`mapcrop`	Crop planar map raster
`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`	Fill in regular data grid from seed values and locations

`georasterref`	(Not recommended) Create geographic raster reference object
`maprasterref`	(Not recommended) Create map raster reference object
`refmatToWorldFileMatrix`	Convert referencing matrix to world file matrix

`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.
Types of Data Grids and Raster Display Functions
You can display regular and geolocated data grids in many ways, such as a 2-D indexed image where color represents the data value, or as a 3-D surface with light shading.
Spatially Reference Imported Rasters
When you cannot import spatial referencing information using the readgeoraster function, you can manually reference the raster instead.
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.

Construct a Global Data Grid
This example shows how to store a matrix in a geographic referencing object. Display the matrix on a map, and specify display properties such as the projection, axes labels, and color map.

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.

Data Grids as Logical Variables
You can perform logic tests on data grid variables to create a binary logical grid.

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.