[Solved] Position.interpolate how to use correctly

[bako]

Hi all.
who use Position.interpolate? the use is:
Position.interpolate(percent, position1, position2)
where percent is from 0 to 1. right?

so, if i i've a position (only latlon, not elevation) between position1 and position2 how can i calculate the correct percent?

[patmurris]

Use LatLon.greatCircleDistance() and compare distances from your LatLon to pos1 and pos2. Note that interpolate does not follow great circle lines though.

[nlneilson]

latp = lat1 + perc*(lat2-lat1)
Works good.

[bako]

latp = lat1 + perc1*(lat2-lat1)
Works good.

what's that formula?

latp stay for? perc1?

i use the interpolation to discover the elevation of some point.

[nlneilson]

To find the latlon 20% (or any percent) between latlon1 and latlon2 do this for lat and lon.
Checking with the Vincenty Inverse and Direct formula it's OK.

[nlneilson]

Using two GPS loggers, one as base and roaming, from the Gov. survey markers, often referred to as brass caps, which is a brass cap on a concrete monument, the positions are stored on the loggers.

Processed by Python code with the concept provided here
latp = lat1 + perc*(lat2-lat1)
to divide a section (approx. one square mile) into 1/2, 1/4, 1/8 and 1/16 the resulting latlon positions are reasonably close (within the accuracy of the GPS receivers with DGPS) and the Roaming corrected to the Base I can get to about 1 foot of positions obtained by a Total Station Survey Laser Transit.

This is the way GPS surveying is done to an accuracy of about 1 cm with systems starting at about $20,000.

WWJ is a good app to display this data.

[bako]

Use LatLon.greatCircleDistance() and compare distances from your LatLon to pos1 and pos2. Note that interpolate does not follow great circle lines though.

thanks, it's works as i expected.

[western19]

Interpolation does not follow great circle lines though. Chicago Popcorn Ceiling Removal

[bahamianiridescent]

Be aware, however, that interpolate does not adhere to great circle paths. demolition contractors

[sirbills]

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