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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:37.40734144,-121.80212936,579.3444429
<<<<< Paste here
SV Parking Lot:37.40885208,-121.80121228,618.87780061
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<<< OR Enter here
Cattle trough:
37.40725643,-121.80292872,588.60184566
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Subject Location:37.34110674,-121.64305876,1290
<<<<< Paste here
Hill above trough
37.40706098,-121.80379817,587.52335669
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<<< OR Enter here
Above SV2
37.40734144,-121.80212936,579.3444429
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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 subject117.604degrees
Bearing equation: movable-type.co.uk.
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Horizontal Range15.869kilometers
Assumes world is flat
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Actual Range to subject15.885kilometers
Accounts for elevation
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Angle of Elevation2.564degrees
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Apparent subject size0.087degrees
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 frame4.2%
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Sensor pixels241.766pixels
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Calculations
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Shot Location ...
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split37.40734144-121.8021294579.3444429
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lat, lon, elevation:37.40734144-121.8021294579.3444429
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radians0.6528812725-2.125848193
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Subject Location ...
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split37.34110674-121.64305881290
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lat, lon, elevation:37.34110674-121.64305881290
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radians0.651725259-2.123071888
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Elevation difference =710.6555571meters
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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 =0.000001551026161
Square of half the chord length between the pts.
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c =0.002490804659
Angular distance between the points (radians)
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d =15,868.92
Horizontal Distance (meters)
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