Possibilities For Situating A 1km2 Array

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Possibilities For Situating A 1km2 Array

• Stephen Fegan(UCLA)

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Lessons From Simulations

• Simulations show elevation effect not so large.
• Can compensate with
• Slightly larger dish
• Higher QE
• Construction and operation costs grow
  dramatically with elevation above 3.5km
• ALMA O2 required for all work at 5km
• Construction with portable O2 tanks
• Control building has O2 plumbing
• Consider here viable sites from 3-4km

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Shuttle Radar Topography Mission

• NASA / NGA
• STS-99, Feb 2000, 11 day on Endeavour
• Surface elevation using radar interferometry
• Between latitude of -56 and 60 (80 of world)
• 1 arcsec horizontal accuracy (30m at equator)
• 16m vertical accuracy
• Data publicly available from JPL / USGS / GLCF

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SRTM Data Visualization
From NASA/JPL http//www2.jpl.nasa.gov/srtm/
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SRTM Site Search

• Search SRTM preliminary data set for
• Contiguous circular region
• With radius 720m (980m / 1.6km2)
• At elevation gt2500m
• Flat to 100m
• Ignoring voids in data

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Search Results
Elevation Key gt2500m gt3000m gt3500m
gt4000m gt4500m gt5000m
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Search Results Far West
Elevation Key gt2500mgt3000mgt3500m gt4000m gt4500m gt
5000m
Mexico
Hawaii
Guatemala
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Search Results Near West
Elevation Key gt2500mgt3000mgt3500m gt4000m gt4500m gt
5000m
Colombia
Ecuador
Peru
Bolivia
Chile
Argentina
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Search Results Near East
Elevation Key gt2500mgt3000mgt3500m gt4000m gt4500m gt
5000m
Iran
Nepal China
Uganda
Ethiopia
Congo
Kenya
Tanzania
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Search Results Far East
Elevation Key gt2500mgt3000mgt3500m gt4000m gt4500m gt
5000m
China
Indonesia (Papua)
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Hawaii
NASA Landsat / GLCF / http//landcover.org/
From Yahoo Travel http//travel.yahoo.com/
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Hawaii Mauna Loa
Hawaii Mauna Loa (Active Volcano)
Distance N-S km
NASA SRTM and Landsat data from JPL
http//www2.jpl.nasa.gov/srtm/ GLCF
http//landcover.org/
Distance E-W km
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Mexico Mexico City
Mexico Mexico City (Metro Region)
Distance N-S km
NASA SRTM and Landsat data from JPL
http//www2.jpl.nasa.gov/srtm/ GLCF
http//landcover.org/
Distance E-W km
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Ecuador
Distance N-S km
NASA SRTM and Landsat data from JPL
http//www2.jpl.nasa.gov/srtm/ GLCF
http//landcover.org/
Distance E-W km