GSC Sentinel-2 PDGS OCD - Emits - ESA

Table 4-5 Radiometric image quality requirements.
GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 101 of 350
Geometric image quality
requirement
Performance
Ground processing
hypothesis
A priori accuracy of image location 2km max (3) No processing
Accuracy of image location
Accuracy of image location
Multitemporal registration
Multispectral registration for any
couple of spectral bands
20m (2)
After image processing
without control points
12.5m (2) After image processing
with control points
3m (2) for 10m bands
6m (2) for 20m bands
18m (2) for 60m bands
3m (3) for 10m bands
6m (3) for 20m bands
18m (3) for 60m bands
Table 4-6 Geometric image quality requirements.
4.4.4.2 Prototype Level-2A Quality Baseline
After image processing
with control points
After image processing
with control points
Prototype Level-2A products are those related to the correction of the atmospheric and
topography influences in order to derive radiometric measurements at surface level.
The target accuracy for the bottom-of-atmosphere (BOA) reflectance is 5% relative. For water
vapour a relative accuracy of 10% is aimed for in the range between 0.1 and 4 g/cm 2 . The
target aerosol optical depth (AOD) accuracy is 10% relative for the range between 0.05 and
3. Being a prototype product, the above quality levels will be monitored and fine-tuned during
the mission lifetime.
4.4.5 PRODUCT TIMELINESS
The product characteristics in terms of timeliness will be settled in the HLOP based on the
choice of the CGS network and priority rules. As such, they will directly cascade from the
high-level mission operation principles outlined in section 4.5.1.5 on this matter and further
detailed in section 4.5.4.2. According to the above, product timeliness will be observed as
falling into three classes with their association with GSCDA timeliness denominations defined
in [AD-02]:
○ Real-Time (RT), corresponding to the product on-line availability no later than 100
minutes after data sensing. As all data will be processed “on-the-flow” from datareception
it is anticipated that a large part of RT products will match the NRT1h
timeliness denomination of the GSCDA;
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