Actually we have data only at few points. There is no invalid data.

What i'm trying to do is something like resizing a image. Suppose i have a 100x100 image and i want to resize it to 1000x1000.

To be precise, I have a world map, and a dataset for every 1.25 interval along both latitude and longitudes. Now I want to be able to interpolate the existing data, so that i can calculate the data at any point on the map.

Hello Again,

Based on What i'm trying to do is something like resizing a image. Suppose i have a 100x100 image and i want to resize it to 1000x1000. you could use Image::Resize. Sample of code from documentation:

use Image::Resize;
$image = Image::Resize->new('large.jpg');
$gd = $image->resize(250, 250);
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But also Image::Imlib2. Sample of code from Stretch, resize, or thumbnail an image using Perl:

use Image::Imlib2;

# load image from file
my $image = Image::Imlib2->load("in.png");

# get some info if you want
my $width  = $image->width;
my $height = $image->height;

# scale the image down to $x and $y
# you can set $x or $y to zero and it will maintain aspect ratio
my $image2 = $image->create_scaled_image($x,$y);

# save thumbnail to file
$image2->save("out.png");
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