DefineX,Y, andZas data for a sphere and view the data as a surface. Define the colors for the surface,C.

[X,Y,Z] = sphere; C = Z; surf(X,Y,Z,C)

Values ofCare in the range[1]. Values ofCnear -1 are assigned the lowest values in the colormap. Values ofCnear 1 are assigned the highest values in the colormap.

Map the top half of the surface to the highest value in the color table by setting the maximum color limit to 0.

caxis([-1,0])

Reset the axis scaling back to its default range.

caxisauto

Return the values of the current color limits.

v = caxis

v =-1 1

Load thecapefile which contains the image data,X, and the colormap,map, for Cape Cod, Massachusetts.

loadcape

Display the image withCDataMappingset toscaled, and use themapcolormap.

figure image(X,'CDataMapping','scaled') colormap(map)

The color limits span the range of the image data, which is 1 to 192. The blue color of the ocean is the first color in the colormap and is mapped to the lowest data value, 1. You can effectively move sea level by changing the lower color limit value usingcaxis.

Display the image data using four different color limit values.

loadcapefigure colormap(map) subplot(2,2,1) image(X,'CDataMapping','scaled') title('caxis = [1 192]') subplot(2,2,2) image(X,'CDataMapping','scaled') caxis([4,192])% change caxistitle('caxis = [4 192]') subplot(2,2,3) image(X,'CDataMapping','scaled') caxis([7,192])% change caxistitle('caxis = [7 192]') subplot(2,2,4) image(X,'CDataMapping','scaled') caxis([10,192])% change caxistitle('caxis = [10 192]')