<div class="gmail_quote">Hi</div><div class="gmail_quote"><br></div><div class="gmail_quote">From memory the l1b driver doesn't use enough points to get proper geolocation because it sub-samples the 51 which are provided in the l1b file. The best solution (that recommended by NOAA) is to use lagrange interpolation across the 51 points. A lagrange algorithm has been provided in the ticket you referenced but nobody has added it to gdal. I think at the moment you could consider the l1b driver broken.</div>
<div class="gmail_quote"><br></div><div class="gmail_quote">Andrew</div><div class="gmail_quote"><br></div>