Finally: Using the FocalLength in FME

Thanks to Graeme’s fantastic optical writeup I finally created a Workbench in FME. (Actually “Workspace” is the correct expression but rarely used…..)

* For distance to the picture I decided to go with Graeme’s formula “(@Value(jpeg_exif_focallength) * 659.065) / 1000”

* However, I did implement a formula “(4.1-0.0330*@Value(jpeg_exif_focallength))” for the width of the picture.

* The result is a pretty big (29 Mb KMZ-file)     http://bbox.me/pub/gps_cam_1.kmz

* Here is a screenshot:

Finally running it all through FME producing a kmz-file

Looking pretty good! It really is pretty accurate.

/Ulf Mansson

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