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Shapefile Projection

ABDALLAMOHAMED

Hello.

I have 100 US. metro cities in shapefiles and would like to project them. I would like to know the most suitable projection type for them. Currently they are in Geographic Coordinate System: GCS_North_American_1983
Datum: D_North_American_1983.

Thanks a a lot

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ABDALLAMOHAMED

Okay, i will do that

Thanks a lot for your help. Appreciated.

DanPatterson_Retired

So you should read the help topic first for Global Morans, for instance, because the need to project the data is moot if your geographic coordinate system is within 30 degrees since the calculations will use a chordal distance. Again, check it out before you start doing a whole load of unnecessary work like projecting 50+ pairs of data into different coordinate systems.

ABDALLAMOHAMED

The shapefile has no proper .prj file. I wanted to project them so that I can run global Moran's I and LISA and GWR

ABDALLAMOHAMED

They are in polygons, and I selected two metro cities from each state. So they represent the 50 US states. Currently I'm reading an article talking about UTM is the best one.

RebeccaStrauch__GISP

Also keep in mind, that depending on what you are needing to do with the points (polys?), if if the shapefile has a proper .prj (projection) file and/or if you bring it into a file gdb with the correct projection/cooredinate-system assigned, the data should project-on-the-fly. In otherwords, you don't necessarily need to project them.

DanPatterson_Retired

remember, that the continental scale ones are best for a well spread out set of data... if all your points are on one coast or the other, then you might begin to examine those at a more regional level or even State-based. Good luck... but do check what is used by the various levels of government. Here in Canada, they are pretty specific as to what they use on a country and province wide basis

ABDALLAMOHAMED

Dan,

Let me check them, and let you know which one works

Thanks a lot

DanPatterson_Retired

Currently on PRO, but it is the same for ArcMap.

What is the best, depends on your spatial area coverage. You can begin your journey in many ways, but I find the interface from ArcToolbox the easiest to remember

do some reading, start with what is used in your area, or by the federal gov't etc. There are lots of choices lambert's and Albers variants tend to be recommended depending whether your E/W extent is wider than your N/S.

Others will weigh in with opinions, the above guides you to the 'where are'

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