Site Information for Stolwijk

STWK (Stolwijk IGRS)

Marker ID: 13551M001
Operator: TU Delft
Log file: stwk00nld_20240423.log

Receiver

Installed	week/d doy	Removed	week/d doy	Receiver type	S/N	Firmware
2024-05-21T07:30Z	2315/2 142			SEPT POLARX5	3080230	5.5.0

Antenna

Installed	week/d doy	Removed	week/d doy	Antenna type	Dome	S/N	Height	Antenna calibration
2024-04-23T14:00Z	2311/2 114			SEPCHOKE_B3E6	SPKE	5889	0.0000

External Frequency

Installed	week/d doy	Removed	week/d doy	Ext. Frequency type
2024-05-21T07:30Z	2315/2 142			INTERNAL

Notes

2024-04-16T14:00Z 2310/2 107 - 2024-04-23T16:00Z 2311/2 114

The IGRS was mounted on the concrete plate but without properly alligning the corner reflectors and without the GNSS antenna installed. The InSAR data for the CR is not reliable for this period. The whole assembly is mounted on a 35 cm thick concrete block fixed to 3 steel/grouted 13 m long foundation piles, with a diameter of 16.7 cm, to a sub-surface sand deposit. On top of the sand layer is a 11.5 m peat toplayer.

2024-04-23T14:00Z 2311/2 114 -

The GNSS instrument mechanically connected to two 90 cm trihedral corner reflectors for co-locating (In)SAR ascending and descending radar observations. The GNSS monument itself consists of a SECO mount, on top of a 2.5 m heigh 8 cm diameter stainless steel pipe, with a 35 cm square strudded footplate. On each side, a 90 cm corner reflector for ascending and descending InSAR tracks is attached. 1.412 m below the GNSS monument a GCP for LIDAR measurements (the top plate of the IGRS) is present. The top plate of the IGRS is 1.126 meter above the concrete block, the GNSS monument is 1.412 m above the top-plate (LIDAR GCP).