Ca Ira Tide Gauge
18.52499 deg N, 72.65077 deg W
Located at the northern corner of the Ca Ira Orphanage. The photo below shows a group of Ca Ira villagers who assisted in the installation, surrounding the local radio station (Radio Cosmos) engineer, Hilaire Jovaty, who provided considerable help in the installation.
Incoming 15 minute sampled data may be viewed and downloaded at www.datagarrison.com user "geo" password "hobo". The data are displayed in local time with a latency of up to 2 hours.
The Iridium transmitter (box near top of fence) is located inside the sea wall of the orphanage and the cable passes beneath the grass to the beach sand 3.2 m in front of the corner of the sea wall. The exposed coral sand platform to the NW now ponds sea water at most stages of the tide.
Fig 2 Ca Ira microatoll photographed at 11:04 am local time 27 March. The leveling rod was placed on the highest point near the abundant growth of weeds on the recently uplifted coral.
Installation map and datum
Fig 3. The rectangle shows the orientation of the geodetic map above. Spirals indicate tripod turning points, square is transducer, orange circle is a reference bench mark, and blue circles are exposed corals at 18.52588N -72.65102E. The height of the zero of the tide-gauge datum is 1.039 m below the highest point on the exposed, sampled microatoll.
Fig 4 Recent data from the Ca Ira tide gauge
Fig 5 Richard Boyer pointing to the control bench mark located at the center step of the doorway above the sea wall at the northern entrance to the orphanage.