CORS Guidelines Giovanni Sella Goal Upgrade the quality

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CORS Guidelines Giovanni Sella

CORS Guidelines Giovanni Sella

Goal Upgrade the quality of CORS data and accuracy of associated meta data Why

Goal Upgrade the quality of CORS data and accuracy of associated meta data Why Now? -The network is mature ~ 1 site every 150 km - Quality versus quantity - L 2 C is here and L 5 is coming - Galileo on its way

National CORS Coverage 50 km 25 km 100 km 150 km

National CORS Coverage 50 km 25 km 100 km 150 km

CORS network is 98% volunteer i. e. non-NGS How - Changes must be consistent

CORS network is 98% volunteer i. e. non-NGS How - Changes must be consistent with the needs of both NGS and the site operators - Guidelines must accommodate a diverse group of site operators and data users

Stability Monument and Environment Monument - Must be able to maintain a consistent 3

Stability Monument and Environment Monument - Must be able to maintain a consistent 3 -D position NOT affected by short term surface motion or monument motion Environment - The space around the antenna should not change No vegetation growth, additional structures, etc.

Equipment Antennas and Receivers Antennas - currently L 1 + L 2 will soon

Equipment Antennas and Receivers Antennas - currently L 1 + L 2 will soon require L 2 C and L 5 - radomes NOT recommended - oriented to true North - mark to ARP constant (Change ant. same coord. ) Receivers - programmed with accurate meta-data - cutoff angle 5º required and 0º preferred - collect data from satellites with “unhealthy” status - collect hourly files, not daily - National CORS must receive raw, not RINEX, files

Meta-data Site Log and Photographs Site Log - Written record of all equipment ever

Meta-data Site Log and Photographs Site Log - Written record of all equipment ever used and contact info for a site Including: firmware, antenna cables, new obstructions, removed obstructions Photographs - Visual record of equipment and monument

Implementation Site Selection Team - Assess all new CORS based on current guidelines and

Implementation Site Selection Team - Assess all new CORS based on current guidelines and requests changes if needed Data quality check - Revamping all meta-data via NGS Integrated Database Same standards National - less dense, ~100 km, checked frequently, NGS distributes and permanently archives data Cooperative - high density, checked less frequently, site operator distributes and archives data for at least 30 days

CORS Metrics Individual site quality assessment is based on a comparison to the network

CORS Metrics Individual site quality assessment is based on a comparison to the network as a whole, not an arbitrary standard The worst performing sites will be encouraged to upgrade and may be dropped from the CORS network if a newer better site is available Guidelines available at www. ngs. noaa. gov/CORS/Articles/CORS_guidelines. pdf

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