How to define different color for NaN values than that assigned by colormap in geoshow?

I'm trying to create a plot of gridded data using geoshow() and assigned colors to the plot using colormap() command. The data has NaN values for few grid points. The color assigned to these grid point is that of the bottom most strip of colorbar. I want the color of these grid points with NaN to be different (preferably white) from the color assigned by colormap(). The code, sample data and plot generated with code have been attached. I have tried different ways to do it but couldn't succeed. Please help me to find a way out. Thanks is advance.

%----- Code used for generating spatial plots---

latlim = ([19 23.75]);
lonlim = ([80 87]);

lat = latlim(1):0.25:latlim(2);

lon = lonlim(1):0.25:lonlim(2);
[lat, lon] = meshgrid(lat, lon);

Param = csvread('Reg_PCPTOT.csv');

Shapeloc = 'Mahanadi_basin.shp';

[S, a] = shaperead(Shapeloc, 'UseGeoCoords', true);

figure('Color','white','PaperPosition', [0.25 0.25 16 16], 'PaperUnits', 'inches');

ax = worldmap(latlim, lonlim);

t = geoshow(lat, lon, Param, 'displaytype', 'texturemap');

colormap('jet');

geoshow([S.Lat], [S.Lon],'LineWidth',2,'Color','black');

setm(ax,'FontName','calibrilight','FontSize',14);

title('pcptot','FontSize',18, 'FontWeight','bold');

hcb = colorbar('eastoutside');

print('Reg_PCPTOT','-dtiff','-r300')

[jonas]

There is nothing attached.. Don't forget the shp

[Lalit Pal]

Oops! Here jonas, I have attached it here.

Answer 1

[KSSV]

t = geoshow(lat, lon, Param, 'displaytype', 'surface');

Use surface as displaytype instead of texturemap.

OR

t = geoshow(lat, lon, Param, 'displaytype', 'texturemap');
colormap('jet');
t.AlphaDataMapping = 'none'; % interpet alpha values as transparency values
t.FaceAlpha = 'texturemap'; % Indicate that the transparency can be different each pixel
alpha(t,double(~isnan(Param))) %

[Lalit Pal]

I tried with 'surface' but the plot I'm getting (attached with) is not good or I should say correct. Please see the plot attached.

[Lalit Pal]

The Second option worked!! Thank you so much!

Can you please also tell me how can I bring the xticklabel closer to the map xaxis in this plot itself.

[Francisco Javier Alvial Vásquez]

Great!!