## Construct a Global Data Grid

Imagine an extremely coarse map of the world in which each cell represents 60°. Such a map matrix would be 3-by-6.

1. Create a 3-by-6 grid:

```miniZ = [1 2 3 4 5 6; 7 8 9 10 11 12; 13 14 15 16 17 18]; ```
2. Now make a referencing object:

```miniR = georasterref('RasterSize', size(miniZ), ... 'Latlim', [-90 90], 'Lonlim', [-180 180]) ```

```miniR = GeographicCellsReference with properties: LatitudeLimits: [-90 90] LongitudeLimits: [-180 180] RasterSize: [3 6] RasterInterpretation: 'cells' ColumnsStartFrom: 'south' RowsStartFrom: 'west' CellExtentInLatitude: 60 CellExtentInLongitude: 60 RasterExtentInLatitude: 180 RasterExtentInLongitude: 360 XIntrinsicLimits: [0.5 6.5] YIntrinsicLimits: [0.5 3.5] CoordinateSystemType: 'geographic' AngleUnit: 'degree'```
3. Set up an equidistant cylindrical map projection:

```figure('Color','white') ax = axesm('MapProjection', 'eqdcylin'); axis off setm(ax,'GLineStyle','-', 'Grid','on','Frame','on') ```
4. Draw a graticule with parallel and meridian labels at 60° intervals:

```setm(ax, 'MlabelLocation', 60, 'PlabelLocation',[-30 30],... 'MLabelParallel','north', 'MeridianLabel','on',... 'ParallelLabel','on','MlineLocation',60,... 'PlineLocation',[-30 30]) ```
5. Map the data using `geoshow` and display with a color ramp and legend:

```geoshow(miniZ, miniR, 'DisplayType', 'texturemap'); colormap('autumn') colorbar ```

Note that the first row of the matrix is displayed at the bottom of the map, while the last row is displayed at the top.

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