coordinate for images

[mengzhibin]

We need images with coordinate such as gps, but I cannot understand the converting function of your api. Is there such dataset?

[janesjanes]

Hey mengzhibin,
this might help answering your question #95

We don't currently have gps in the dataset but you can convert to that pretty easily. The city coordinate we are using is based on UTM system.

"City coordinates can be converted to the UTM (Universal Transverse Mercator) coordinate system by simply adding the city’s origin in UTM coordinates to the object’s city coordinate pose"

Then you can just convert from UTM to lat/long

[johnwlambert]

Thanks for your interest in our work @mengzhibin. As @janesjanes said, the real conversion here is from UTM to GPS: our city coordinate system origin is simply a constant offset from UTM. In the Supplemental Material we refer to the following paper for the math:
J. P. Snyder. Map projections: A working manual. u.s. geological survey professional paper. page 61, 1987.
https://pubs.usgs.gov/pp/1395/report.pdf
pages 57-64

We don't provide a UTM->GPS converter in our API, but there are many other python packages that do.

[mengzhibin]

Thanks for your reply