Choose a historical sector, check the evidence gap, and generate a practical field-verification brief.
Three clear answers: what we know, what remains unknown, and what to request next.
A published 2005 field study documented six coastal infrastructure sectors. A separate CSEM GPS-derived station series spans 2010–2021.
Meaning: these are references worth reviewing—not current measurements on a selected asset.
Review historical recordsExact sector geometries and current on-asset measurements are unavailable in this prototype. Independent BAKO multi-GNSS QC cannot validate CSEM movement or port safety.
Meaning: no live alert, structural verdict, or asset risk ranking.
See geographic referencesSelect a documented sector, confirm its authoritative geometry, arrange suitable updated measurements, then have qualified specialists review them.
Output: a sector-specific verification brief with source history and missing-data requirements.
See the verification outcomeThe report records what is known, what cannot be concluded, and which checks should be requested for the selected sector.
The six-sector field measurements are from 2005. BMKG listed Semarang's coast in a rob-potential bulletin for 1–6 November 2026. That window has passed; it is not an active alert and does not establish asset movement.
Historical settlement: published cumulative measurements in 2005, not 2026 asset conditions or a yearly rate.
CSEM GPS: historic station coordinates from 2010–2021. A regional station is not an instrument on the selected port structure.
BAKO multi-GNSS: authentic observation-quality data from Cibinong in 2025, not a Semarang movement calculation.
WGS84 / EPSG:4326: coordinates and approximate distances provide geographic context, not a coastal exposure or engineering hazard model.
Explore authentic historical GPS positions and independent multi-GNSS observation quality.
Historical GPS station positions · Semarang
Verified observation QC · Cibinong · 41 epochs
If you have authorized local CSEM/CSMG QC data, inspect daily epoch coverage and missing station-days. The public demo does not distribute these private station files.
No station QC loaded. Choose a local summary to see the comparison; this page does not upload or save the file.
The plot compares time coverage and GNSS pseudorange observation presence, not millimetre positioning accuracy. Missing files do not prove a receiver outage. CSEM (historic GPS-derived displacement), CSMG and the independent BAKO multi-GNSS QC are not interchangeable station or time series. No site-specific inspection risk or annual subsidence rate is calculated.
BIG/SRGI terms may restrict redistribution of original or derived data. Import locally; check permission before sharing exported screenshots or reports.
Verifying dataset provenance. Historic port measurements, CSEM GPS history, and BAKO multi-GNSS QC are separate sources; none establishes a current asset condition.
Station-level data, not direct asset movement
Historical data · current asset condition unknown · no risk score
Public reference points, not asset measurements.
—Geographic context only.
View original source ↗Only verified reference locations are mapped. The six researched port sectors are listed separately because their exact survey geometries are not available.
Haversine distance from CSEM is approximate geographic separation. It does not validate shared ground movement or asset proximity thresholds.
| REFERENCE | LAT, LON · WGS84 | FROM CSEM | ROLE / SOURCE | EVIDENCE RELATION |
|---|
This plot is geographic context, not an asset survey or hazard map. Sources: BIG InaCORS catalogue, IGS BAKO, OSM port terminal, Semarang GIS.
2005 cumulative settlement · not current asset readings
Select a sector to review its historic evidence.
What the source supports—and what needs checking next.
CSEM historical positions and independent BAKO observation QC answer different questions. Compare local CSEM/CSMG day coverage only when authorized QC files are available.
A historical GPS solution alone is not proof of multi-constellation observations.
Historic CSEM movement and BAKO multi-GNSS QC require separate provenance.
Every output includes provenance, observation coverage, analysis assumptions, station-to-asset relationship and reason codes. Missing evidence remains missing evidence—it is never treated as stability.