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swri-robotics / gps_umd

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what's the scale between UTM odom and real distance? #36

Closed Tengyun-Mo closed 2 years ago

Tengyun-Mo commented 4 years ago

When I use utm_odometry_node, it tells 0.823 that I moved,but actually I moved about 9 meters.So,what's the scale between UTM odom and real distance?

kriskozak commented 4 years ago

The scale varies over each UTM zone, but it is close to 1:1, and it should be within 0.1% of actual within entire UTM zones (see https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system#UTM_zone or http://geokov.com/education/utm.aspx). I suspect you are seeing some other problem with that large of a difference.