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Incorrect MSRG bounding boxes at UTM zone boundaries? #22

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gregsadetsky opened this issue Oct 17, 2018 · 0 comments

gregsadetsky commented Oct 17, 2018

Bounding boxes for MSRG 100km grid zones near UTM zone boundaries seem incorrect.

For instance, calling USNGtoLL with the grid zone identifiers 16RGV and 17RKQ returns bboxes which overlap.

Visual demonstration:
https://gregsadetsky.github.io/mgrs-usng-js-libs-overlap/demonstrations/codice-usng/dist/

the red (overlapping) polygons' coordinates are generated using USNGtoLL
the green (non-overlapping) polygons are coming from the reference 16R / 17R shapefiles from the NGA.

Demonstration code:
https://github.com/gregsadetsky/mgrs-usng-js-libs-overlap/blob/master/demonstrations/codice-usng/app.js

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