Shot Planning Worksheet
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Photographic Shot Planning Worksheet
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Given the position (latitude,longitude) and elevation of a shot location and subject location, compute the bearing, range and elevation angle. Use this in conjunction with an ephemeris to plan the lighting or alignment with Sun/Moon/stars.
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For most purposes, an app such as The Photographers Ephemeris or Photo Pills will be fine and much easier to use. But I've found that the elevation data in TPE is not nearly as precise as what's available from Google Earth. This is significant in some plans.
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Chip Chapin <cchapin@gmail.com>
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Instructions:
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1. Locate your shot position and subject in Google Earth (earth.google.com/web/).
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2. For each one, either copy the "latitude,longitude,elevation" from the first part of the Google Earth URL (it comes after "https://earth.google.com/web/", between the "@" and "a"), OR place a point and look in the property editor. Remember to use 2D mode and update the view "Capture".
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3. Paste the "latititude,longitude,elevation" into the boxes below.
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4. Optional: Enter subject size and lens information to see how big a given subject will appear.
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Enter either the "lat,lon,elevation" from the URL, or separately from point Property Editor:
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Shooting Location:37.33156539,-121.71649342,510.55247654
<<<<< Paste here
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<<< OR Enter here
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Subject Location:37.34110674,-121.64305876,1285.25634598
<<<<< Paste here
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<<< OR Enter here
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Optional:
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Subject Size (m)24
single dimension in meters
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Lens focal length (mm)
1000mm
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Lens crop factor1.0
1.0 for "full-frame 35mm" (36mm sensor width)
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Camera sensor width5760.0pixels
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Results:
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Bearing to subject80.697degrees
Bearing equation: movable-type.co.uk.
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Horizontal Range6.578kilometers
Assumes world is flat
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Actual Range to subject6.624kilometers
Accounts for elevation
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Angle of Elevation6.716degrees
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Apparent subject size0.208degrees
Moon is 0.52 degrees
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Lens Angle of View2.062degreesAOV (width)
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Relative subject size:
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Percent of frame10.1%
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Sensor pixels579.781pixels
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Calculations
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Shot Location ...
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split37.33156539-121.7164934510.5524765
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lat, lon, elevation:37.33156539-121.7164934510.5524765
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radians0.651558731-2.124353564
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Subject Location ...
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split37.34110674-121.64305881285.256346
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lat, lon, elevation:37.34110674-121.64305881285.256346
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radians0.651725259-2.123071888
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Elevation difference =774.7038694meters
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Haversine formula ...
movable-type.co.uk.
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R=6,371,000
Earth's mean radius (meters)
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a =0.000000266547042
Square of half the chord length between the pts.
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c =0.001032563927
Angular distance between the points (radians)
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d =6,578.46
Horizontal Distance (meters)
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