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[ferret_users] Transformation: curvilinear to rectangular issue

Dear Ferreters,
I have interpolated some data from curvilinear coordinates into regular.
First of all I computed the array of coefficients of a transform and then I did transform.
But what I got as a result somehow embarrassed me because on the left bottom side picture I have a blurred data and I don't know why.
I attach two pictures.
The first one that I called INPUT_etopo2 is an input of the transform on curvilinear grid.
The second is a print of interpolated data onto rectangular grid but with a blur.
The region which I concentrated on was
What has caused this smear? What do you think?

Kind regards,
Szymon Roziewski

Attachment: INPUT_Etopo2.gif
Description: GIF image

Attachment: InterpolatedEtopo2_blurred.gif
Description: GIF image

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