Questionnaire Results on Hydrosphere Products

Within the hydrosphere research topic of the EDA Alliance five higher-level image products were specified which are listed in the following table. In general, the interest of the users at the soil moisture product was quite high. In total, of the 101 respondents who took part in the survey, 39 were interested in “Soil Moisture” products, 8 in “Ocean Surface Currents”, 10 in “Coastal Area Change” and 9 in the “Wind Speed Velocity Map”.

Product Scale Spatial Resolution Accuracy Temporal Resolution
Soil Moisture Local 50 m x 50 m 5 - 10 [vol%] 1 - 2 times per week
Soil Moisture Change Local 50 m x 50 m 5 - 10 [vol%] 1 - 2 times per week
Ocean Surface Current Coastal regions (worldwide) 50 m x 50 m 5 cm/s every 5 days
Coastal Area Change Coastal regions (worldwide) 50 m x 50 m 10 cm yearly
Wind Speed Velocity Map Coastal regions (worldwide) 4 km x 4 km or 20 km x 20 km 2 cm/s for surface winds between 2 m/s and 20 m/s <= 5 days

The conformance of the user requirements with the specified product parameters is shown in the following figure. It can be observed that most of the users were satisfied with the product specifications. In case of the “Soil Moisture and Change” products a small number of respondents were asking for a better spatial resolution and a higher accuracy. Concerning the spatial resolution it is the goal to generate the soil moisture products with a pixel spacing of 20 x 20 m. However, a higher accuracy can currently not be promised due to system specifications.

Conformance of the user requirements with the product specifications (Spatial Resolution, Accuracy, and Temporal Resolution) for the hydrosphere products.

Regarding the product availability, the next figure shows the distribution of the corresponding user requests. As expected, most of the respondents require the products quite fast. Approximately 27% of the users need the products within one day after image acquisition and 37% within one week. Currently, a latency of 4 days is indicated for the specified hydrosphere products which meet at least the requirements of the majority of the users.

Indicated time frame for the hydrosphere product availability after image acquisition.

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