iGage X90-OPUS, Руководство пользователя

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b. Horizontal and Vertical Datum; Geoid model
choice
c. Survey style: OPUS-Static, OPUS-Rapid Static,
OPUS-Projects
d. Consider FGDC Standards:
http://www.fgdc.gov/standards/projects/FGDC-standards-projects/accuracy
B. Are there passive marks available for control?
a. Will CORS, passive or a combination control
the survey?
b. Are local passive marks recoverable,
undisturbed, sufficient quality, stable and
GPS friendly?
c. Where are the nearby NGS CORS (active)
marks? This will determine ‘Rapid Static’ or
‘Static’ availability.
C. OPUS-Rapid Static Requirements
a. Find the closest 9 CORS sites with available
observations
b. A minimum of 3 CORS stations within 250 KM
are required.
c. Your site must be within 50 km of a polygon
created by the remaining available CORS.
d. If the eligible CORS count is low, check the
past reliability of recent observations to
insure that there is a high probability of
sufficient sites for OPUS-RS to compute a
solution. Use the CORS ‘Data Availability’ to
check for recent observations:
D. Mission Planning: Satellite Availability and Network
Planning