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 the readgeoraster function, you can manually reference the raster instead.

Mosaic Spatially Referenced Raster Tiles

To analyze data spread across several raster tiles, first combine the tiles into a single raster.

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.