Hello,
We’re trying to subset and reproject Sentinel-3 LST data acquired before the PDGS cuts the products in slices. Below an example of such product with the AOI we want to extract
We run this on a computer with 32GB of RAM but we still get the Java heap space Out of Memory exceptions.
We’ve tried subset + reproject and subset alone with gpt.
Is there a way to subset a Sentinel-3 LST Level-2 that will fit on a 32gb of RAM computer?
Hi Fabrice,
can you tell me the product name and the coordinates of the region? Then I could try it with your configuration.
I just tried it and it worked quite good. I have only 16GB RAM in my PC but configured SNAP with only 11GB.
Red is the subset, white the orbit.
Had you selected only the LST band during the subsetting, right? Otherwise SNAP tries to do the subset of the entire product.
I also use it actually with 32GB RAM but I got multiple files simultaneously without major issues.
Hello, here’s the graph used in SNAP that generates the exception
<graph id="Graph">
<version>1.0</version>
<node id="Read">
<operator>Read</operator>
<sources/>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<file>/Users/fbrito/Downloads/S3A_SL_2_LST____20200422T063257_20200422T081356_20200423T193710_6059_057_234______LN2_O_NT_004.SEN3/xfdumanifest.xml</file>
<formatName>Sen3</formatName>
</parameters>
</node>
<node id="Subset">
<operator>Subset</operator>
<sources>
<sourceProduct refid="Read"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<sourceBands/>
<region>0,0,0,0</region>
<referenceBand/>
<geoRegion>POLYGON ((26.016000747680664 -2.1089999675750732, 59.0629997253418 -2.1089999675750732, 59.0629997253418 12.211000442504883, 26.016000747680664 12.211000442504883, 26.016000747680664 -2.1089999675750732, 26.016000747680664 -2.1089999675750732))</geoRegion>
<subSamplingX>1</subSamplingX>
<subSamplingY>1</subSamplingY>
<fullSwath>false</fullSwath>
<tiePointGridNames/>
<copyMetadata>true</copyMetadata>
</parameters>
</node>
<node id="Reproject">
<operator>Reproject</operator>
<sources>
<sourceProduct refid="Subset"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<wktFile/>
<crs>EPSG:4326</crs>
<resampling>Nearest</resampling>
<referencePixelX/>
<referencePixelY/>
<easting/>
<northing/>
<orientation/>
<pixelSizeX/>
<pixelSizeY/>
<width/>
<height/>
<tileSizeX/>
<tileSizeY/>
<orthorectify>false</orthorectify>
<elevationModelName/>
<noDataValue>NaN</noDataValue>
<includeTiePointGrids>true</includeTiePointGrids>
<addDeltaBands>false</addDeltaBands>
</parameters>
</node>
<node id="Write">
<operator>Write</operator>
<sources>
<sourceProduct refid="Reproject"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<file>/Users/fbrito/Downloads/target.dim</file>
<formatName>BEAM-DIMAP</formatName>
</parameters>
</node>
<applicationData id="Presentation">
<Description/>
<node id="Read">
<displayPosition x="37.0" y="134.0"/>
</node>
<node id="Subset">
<displayPosition x="176.0" y="151.0"/>
</node>
<node id="Reproject">
<displayPosition x="326.0" y="144.0"/>
</node>
<node id="Write">
<displayPosition x="455.0" y="135.0"/>
</node>
</applicationData>
</graph>Is the exception the “Java heap space Out of Memory” you mentioned?
Because I remember to get an issue until I have downloaded the last plugins for S3.
I believe you got this already in its latest version, right?
Still, I see you do not select a single band, so this operation requires more memory with respect to select one single band.
Not sure it is useful. Let us know
I’ve updated everything I could so I believe I’m running the latest versions.
Actually the graph builder does bot suggest the band names to select from. Is this showing another issue?
Well… depends.
Sometimes SNAP needs what I call a “refresh” on the graph builder. Try saving and reloading the same graph again.
For me this use to solve this kind of situation.
For future reference, here’s the graph that works:
<version>1.0</version>
<node id="Read">
<operator>Read</operator>
<sources/>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<file>/Users/fbrito/Downloads/S3A_SL_2_LST____20200422T063257_20200422T081356_20200423T193710_6059_057_234______LN2_O_NT_004.SEN3/xfdumanifest.xml</file>
<formatName>Sen3</formatName>
</parameters>
</node>
<node id="Subset">
<operator>Subset</operator>
<sources>
<sourceProduct refid="Read"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<sourceBands/>
<region></region>
<referenceBand/>
<geoRegion>POLYGON ((26.016000747680664 -2.1089999675750732, 59.0629997253418 -2.1089999675750732, 59.0629997253418 12.211000442504883, 26.016000747680664 12.211000442504883, 26.016000747680664 -2.1089999675750732, 26.016000747680664 -2.1089999675750732))</geoRegion>
<subSamplingX>1</subSamplingX>
<subSamplingY>1</subSamplingY>
<fullSwath>true</fullSwath>
<tiePointGridNames/>
<copyMetadata>true</copyMetadata>
</parameters>
</node>
<node id="Reproject">
<operator>Reproject</operator>
<sources>
<sourceProduct refid="Subset"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<wktFile/>
<crs>EPSG:4326</crs>
<resampling>Nearest</resampling>
<referencePixelX/>
<referencePixelY/>
<easting/>
<northing/>
<orientation/>
<pixelSizeX/>
<pixelSizeY/>
<width/>
<height/>
<tileSizeX/>
<tileSizeY/>
<orthorectify>false</orthorectify>
<elevationModelName/>
<noDataValue>NaN</noDataValue>
<includeTiePointGrids>true</includeTiePointGrids>
<addDeltaBands>false</addDeltaBands>
</parameters>
</node>
<node id="Write">
<operator>Write</operator>
<sources>
<sourceProduct refid="Reproject"/>
</sources>
<parameters class="com.bc.ceres.binding.dom.XppDomElement">
<file>/Users/fbrito/Downloads/target.dim</file>
<formatName>BEAM-DIMAP</formatName>
</parameters>
</node>
<applicationData id="Presentation">
<Description/>
<node id="Read">
<displayPosition x="37.0" y="134.0"/>
</node>
<node id="Subset">
<displayPosition x="176.0" y="151.0"/>
</node>
<node id="Reproject">
<displayPosition x="326.0" y="144.0"/>
</node>
<node id="Write">
<displayPosition x="455.0" y="135.0"/>
</node>
</applicationData>
</graph>
Thank you both !What is the crucial difference?
true
Was this parameter not filled by default by SNAP?
Set to false by default