1

I have lat/long and when I convert to UTM, my points are in zones 35 and 36. is it possible to "transform" or "project" (I am not sure which word is used to do this operation) the UTM coordinates from zone 36 to zone 35 ?

Edit: Just to clarify I have those two coordinates.

point 1: is in 35L 460880.04 E 8327740.29 S
point 2: is in 36L 201956.55 E 8375498.52 S

is there any way to say: point 2 is in 35L xxxxxxx E yyyyyy S ?

enter image description here

  • 3
    What GIS software and version are you using? There is a Project tool and a Define Projection tool in ArcGIS. That said, if your lat/long points are actually in UTM 36, you're likely to get some spatial distortion by putting them in UTM 35. Now that also said, every projection has some distortion in area, shape, etc. – recurvata Feb 25 '15 at 17:26
  • If you have a single set of points in lat/long, and you 'convert' them to UTM, they're going to be in a single UTM projection. Some of those points may fall outside the zone, but with a single 'conversion' they're going to be using the same UTM projection. There's no need to change points in one UTM to the other unless you did two conversions originally - the points in 35 zone were projected to that, and the points in 36 to that. The term is project, but if you have lat/long it's probably WGS84 and UTM uses a different datum so you would also need a transformation. – Chris W Feb 25 '15 at 22:14
  • If trying to pick a UTM zone to use, select the one that either has the most points in it or has the least number of points at the farthest distance from the zone boundary. Otherwise, select a different projection (or create a custom one) that includes your entire area of interest. Related: gis.stackexchange.com/questions/136063 – Chris W Feb 25 '15 at 22:17
  • 1
    @ChrisW there are apps that will automatically calculate the correct zone per point (just not any Esri ones!). – mkennedy Feb 25 '15 at 22:57
  • @mkennedy Interesting - does it become an attribute or get split into separate files? While they sound handy in determining zone, as far as I know you can't have a single point file with data in two different (correct) projections at the same time, right? I suppose the distinction is whether we're working with geometry data or just tabular data (ie, you get a list of UTM coordinates for each point, and those coordinates are specific to the correct UTM, but if you loaded them all at once as points it would treat them as the same zone - unless it can read a further zone attribute). – Chris W Feb 25 '15 at 23:18
3

Since you didn't specified which software you re using I'm assuming that is either ArcGIS or QGIS.

ArcGIS: you can change the Later's coordinate system by right-clicking it on the table of contents and choosing another UTM zone, this only changes the view a not the data it self. to change the data's coordinate system use the Project tool under Data Management Tools, DO NOT USE THE DEFINE PROJECTION TOOL IF YOUR DATA ALREADY HAS A PROJECT INFO! (this would mess your data beyond pretty bad) Help Docs

QGIS: right-click the data and open its properties choose a new coordinate reference system. After this just right-click the data again and re-saved it. If you only want to change the view go to Project on the top and open the project's properties, you can choose different coordinate systems there.More info

For the records: next time try to add more info on your question such as which software you are using, etc.

  • I am not using any software, I am developing my own application – Guest2015 Feb 26 '15 at 8:57
2

You can project latitude-longitude coordinates into any UTM zone you want. If you know that you're displaying a map in zone 35 South but there are coordinates that would normally fall within zone 36 South, just project them into 35 South instead.

If your display was in some other coordinate system, "Pseudo-Mercator", EPSG::3857, and the incoming points were UTM 35 South, you would have to reproject them as well.

You could display everything in a single UTM zone or some other projected coordinate reference system, but LABEL the positions with the appropriate UTM coordinates, as you did in your image.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.