orthorectified toa reflectance image

RE: orthorectified toa reflectance image

2012-06-04T08:27:11Z

The solution would be to apply the radiometric correction before the orthorectification, wouldn't it?

RE: orthorectified toa reflectance image

2012-05-31T10:01:34Z

Hi,

if it's not an usual problem, maybe we check.

Actually I've not done that much.

I opened the FR MERIS (MER_FR__1PNUPA20040731_095435_000000982029_00065_12644_0743.N1) product with beam. Then I started the orthorectification tool with the following settings:

save as BEAM-DIMAP

CRS from own DEM
use external DEM GETASSE30
resample BILINEAR

The output dim file looks as follows:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Dimap_Document name="MER_FR__1PNUPA20040731_095435_000000982029_00065_12644_0743.N1_rec.dim">
<Metadata_Id>
<METADATA_FORMAT version="2.11.0">DIMAP</METADATA_FORMAT>
<METADATA_PROFILE>BEAM-DATAMODEL-V1</METADATA_PROFILE>
</Metadata_Id>
<Dataset_Id>
<DATASET_SERIES>BEAM-PRODUCT</DATASET_SERIES>
<DATASET_NAME>MER_FR__1PNUPA20040731_095435_000000982029_00065_12644_0743.N1_rec</DATASET_NAME>
</Dataset_Id>
<Dataset_Use>
<DATASET_COMMENTS>MERIS Full Resolution Geolocated and Calibrated TOA Radiance</DATASET_COMMENTS>
<DATASET_AUTO_GROUPING>radiance</DATASET_AUTO_GROUPING>
</Dataset_Use>
<Production>
<DATASET_PRODUCER_NAME />
<PRODUCT_TYPE>MER_FR__1P</PRODUCT_TYPE>
</Production>

.... missing the <PRODUCT_SCENE_RASTER_START_TIME> and <PRODUCT_SCENE_RASTER_STOP_TIME> sections.

Thanks in advance , Petra

RE: orthorectified toa reflectance image

2012-05-29T08:04:37Z

Hi Petra,

yes, the radiometry correction operator relies on the input products having a start time set, so your workaround is correct.
There may be several reasons why you cannot apply an orthorectification to your TOA reflectance product; if you still need me to figure out why it does not run with your TOA reflectance products, I need some more input.

Best regards,
Thomas

orthorectified toa reflectance image

2012-05-25T10:42:16Z

Hi,

I am using BEAM 4.10 to obtain an orthorectified TOA reflectance product from MERIS Level 1B data. However I cannot apply the radiometry correction module to an orthorectified product (Error Message: A problem occurred during the target product initialization. Type: OperationException Message: Source product must have a start time) and I also cannot apply an orhtorectification to a TOA reflectance product (Error: Product XXX_toaref.dim is not a valid source). Is this a common problem? Maybe there is a work around?

Thanks, Petra

Maybe I've found a work around. I modified the section <Production> in the dim file of the orhtorectified image. There I added the <PRODUCT_SCENE_RASTER_START_TIME> and the <PRODUCT_SCENE_RASTER_STOP_TIME>.