Home - General / All posts - Distance between 2 points
 wvayens79 post(s) #07-Jan-22 23:18 Given that I have 2 layers in lat/long, using GeomDistance I'm assuming the result is in degrees. How do I best convert this to feet/miles?Thx.
 oeaulong406 post(s) #08-Jan-22 00:58 Easiest thing to do is to display them in a projected map, then use the Tracker tool to measure their geographic distance as adjusted by the projection units. For SQL analysis, Check out Dimitri's discussion here: https://georeference.org/forum/t153908#153910about the GeomLengthGeo() function.
 lionel916 post(s) #17-Jan-22 00:41 https://georeference.org/forum/t153908#153910 GeomLengthGeo() GeomLengthGeo(, , , ): Given a geom that contains an area or a line object, and values for major axis, eccentricity, and tolerance, returns the geodetic length (computed on the surface of the ellipsoid) of that object, computed using Vincenty's formulae A tolerance of zero means automatic tolerance.The length of an area object is the length of its boundary, that is, the perimeter of the area. The length reported for a branched object is the sum of the lengths of the branches.The geom value must be an area or line in Latitude / Longitude, with X (longitude) and Y (latitude) expressed in degrees. The returned value is in units of the major axis.Looking at the Custom tab of the Base Coordinate System dialog for the WGS84 base used for Latitude / Longitude projection, we can see the major axis is 6378137.01 and the eccentricity is 0.08181919084262149Given a Mexico drawing of provinces as areas in Latitude / Longitude coordinate system, we can write:SELECT GeomLengthGeo([Geom], 6378137.01, 0.08181919084262149, 0) AS [Geodetic Length] FROM [Mexico]; union, doc , APIand most important deepl & keyboard shortcut
 wvayens79 post(s) #17-Jan-22 18:01 Where is the Tracker tool I've seen mentioned a few times. (I'm familiar with it in M8, haven't seen it in M9.) There are a couple of references in the manual, but for the life of me, I can't locate it!
 Sloots581 post(s) #17-Jan-22 18:24 See this topic in the manual. http://www.mppng.nl/manifold/pointlabeler
 wvayens79 post(s) #17-Jan-22 18:46 Thanks!