iGage iG4, Руководство пользователя

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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 stations? 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
a. How many receivers will you use for simultaneous observations? If you are using
OPUS-Projects then More = Better.
b. Checkout online ‘Mission Planning’ tools for U.S. satellite availability using reasonable
masks (>15 degrees) during collection periods. If there are any periods with fewer
than 6 SV’s or PDOPS higher than 3, plan on occupying points longer.
E. How long will you observe a site? Again:
F. Are your sites GPS compatible? Are there obstructions higher than 10 degrees?
G. Field Checklist:
o Maps, aerial photography, ingress/egress plans
o Receiver with memory available
o Batteries fully charged plus battery-to-receiver cables with 12V external battery
o Compass for orienting receiver to North, current declination
o Fixed Height Tripods: Bubbles calibrated? Height verified?
o Tripods / Bipods /Tribrachs / Tribrach adaptors: Tribrachs calibrated?
o Tools for adjusting bubbles (the correct Allen wrenches)
o Measure tape for slant measurements
o Digital Camera, batteries, memory: take close ups of cap and 4 horizon shots w/ receiver
o Station information observation log sheets
o Inclinometer for checking and documenting horizon obstructions
o Field Book, Observation Schedule, pencils
o Cell phone