If you hold your locations as WGS84 lat/lon (which you probably do), make sure to use doubles, to make sure you don’t get rounding errors. Modern civilian gps devices are more accurate than what the single type can represent as lat/lon.
However, this deviation looks much larger than the issues you’d get with singles. I didn’t look at the app. Does it place the marker at your location, or to a hard coded location.
Also, using google, if you ask for lat/lon of an area (e.g. city), you’ll get “some” center point, which might differ from other systems.
If you hold your locations as WGS84 lat/lon (which you probably do), make sure to use doubles, to make sure you don’t get rounding errors. Modern civilian gps devices are more accurate than what the single type can represent as lat/lon.
ReplyDeleteHowever, this deviation looks much larger than the issues you’d get with singles. I didn’t look at the app. Does it place the marker at your location, or to a hard coded location.
Also, using google, if you ask for lat/lon of an area (e.g. city), you’ll get “some” center point, which might differ from other systems.
Yes itu cause by rounding format 5,2,, i replace with floattostr and working
ReplyDeleteIrwanto Irwanto good to hear!
ReplyDelete