How do I display a particular section of a map using Latitude and Longitude values in MATLAB 7.4 (R2007a) ?

I have a map which is in a geostruct format and I would like to display a particular region based on the Latitude and Longitude of the area.

Answer 1

[MathWorks Support Team]

The VIEWMAP0DATA function returns a structure or an array of a structure which contains information about different values pertaining to geographical data.

To view only a particular region of this map do the following:

1) Use the UPDATEGEOSTRUCT to save the output of VMAP0DATA function

land = viewmap0data('...');

st = updategeostruct(land);

VIEWMAP0DATA returns a geostruct. The updategeostruct function changes this structure to geostructure v2.

2) Use The SHAPEWRITE function to store the data in a shape file format on the disk

3 ) Use the SHAPEREAD function to read only the part of the map that you need to view. The SHAPEREAD function allows you to specify a bounding box to limit the data that you want to read, this bounding box can be in terms of Latitude and Longitude values.

Now use the GEOSHOW function to display the map.

The MAPEXGSHHS which is a built in example in the mapping toolbox shows how to use the above functions.