<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">Hello</div><div dir="ltr" data-setdir="false">I have a geotiff file of sea ice concentration.</div><div dir="ltr" data-setdir="false">When I use gdal_info it gives a series of values like:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><div><p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> Metadata:</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> COLORINTERP=Palette</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> Color Table (RGB with 65536 entries)</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 0: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 1: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 2: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 3: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 4: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 5: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 6: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 7: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 8: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 9: 9,60,112,255</p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;"> 10: 9,60,112,255</p><div dir="ltr" data-setdir="false">etc...</div></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">When I use gdal_translate to convert to netcdf:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><span><div>gdal_translate -of netCDF test.tif test.nc</div><div><br></div><div dir="ltr" data-setdir="false">and I look at the values in the test.nc file </div></span></div></div><div dir="ltr" data-setdir="false"><div><div dir="ltr" data-setdir="false"><br></div></div><div dir="ltr" data-setdir="false">...</div><div dir="ltr" data-setdir="false"><p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">3662500 4187500 2540 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">3687500 4187500 2540 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">3712500 4187500 2540 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">3737500 4187500 2540 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3837500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3812500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3787500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3762500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3737500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3712500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-3687500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1762500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1737500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1712500 4212500 16 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1687500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1662500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1637500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1612500 4212500 36 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1587500 4212500 48 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1562500 4212500 2530 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1537500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1512500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1487500 4212500 0 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1462500 4212500 48 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1437500 4212500 104 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1412500 4212500 120 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1387500 4212500 168 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1362500 4212500 216 </p>
<p style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;">-1337500 4212500 316 </p>
<div>...</div><div><br></div><div dir="ltr" data-setdir="false"><span>My question is: when gdal_translate convert to netcdf what does the value in the third column represent?</span><br></div><div dir="ltr" data-setdir="false">Points that are equal to 2540 seem to be land cells, while points with 0 value are ocean cells</div><div dir="ltr" data-setdir="false">Are points with value rating from 0 to 1000 (where sea ice concentration exists) in per thousands? (i.e 100 = 10% sea ice concentration, 1000 = 100%?)</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Tony</div></div></div></div></body></html>