<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Dear Sir</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I need informations or reference, concerning Bessel spatial interpolation (interpolation on geographic grille)</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">where I can found a Formula if it is possible<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Cordialy</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Abdelhak Rezagui</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><br></div></div></body></html>