How to create MASK from "image.tiff"?

Hi Everybody,

I tried to MASK the shapefile of my study area but the matrix of the MASK is only NaN data. so please I need your help. I have attached the script_MASK.

Thank you in advance.

Reyadh

Answer 1

[Image Analyst]

What are the values of your tiff file? It's probably in the range 0-255 so most values will be set to nan because you set all values more than 1 to nan. You might want to set the to nan only if they're outside the range 0-255, or use im2double() to change the range of your image from 0-255 to 0-1.

[reyadh Albarakat]

Hi Image Analyst,

The values of the tiff file are NDVI(Normalized Difference Vegetation Index) the range must be from -1 to +1. then I would like to take values from 0 to 1 in range. Now I'm confused. what should I do?

Thank you so much

Reyadh

[Image Analyst]

If you pass an array into mat2gray() it will scale it to the 0-1 range.

[reyadh Albarakat]

Thank you so much

I have question I want to save the output images.tiff in same name of the original images. suppose the names of files are 1981_07_15.n07-VI3g and 1981_07_16.n07-VI3g respectively SO how can I save outputs in same names of inputs.

Thank you

Reyadh

if true
  for i=1:length(Ii)
  set(0,'DefaultFigureRenderer','zbuffer')
  [Plg,Plt]=meshgrid(lg,lt);
  LATLIMS=[30.952 32.01];
  LONLIMS=[47.09 47.818];
  m_proj('Equidistant Cylindrical','lon',LONLIMS,'lat',LATLIMS);
  img=Ii{i}.*MASK;
   map=m_pcolor(Plg,Plt,img);
  a=colormap(jet);
%     a=fliplr(a);
  set(gcf,'colormap',a);
  shading flat;
  m_grid('linewi',2,'tickdir','out');
  str=num2str(i);
 saveas(map,str,'tif');
end