Raster Data
Georeference, analyze and transform gridded data
Raster data, also known as data grids, stores map data as matrices. Regular data grids require a referencing object, vector, or matrix that describes the sampling and location of the data points. Geolocated data grids explicitly identify the latitude and longitude coordinates of all rows and columns.
Functions
Objects
GeographicCellsReference | Reference raster cells to geographic coordinates |
GeographicPostingsReference | Reference raster postings to geographic coordinates |
MapCellsReference | Reference raster cells to map coordinates |
MapPostingsReference | Reference raster postings to map coordinates |
Topics
Introduction to Geodata in Raster Format
- 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 thereadgeoraster
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.
Regular Data Grids
- 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
- 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.
Applications of Gridded Geodata
- Data Grids as Logical Variables
You can perform logic tests on data grid variables to create a binary logical grid.