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Draw geometries accross 180

KyleRotte

Add the ability to visualize geometries that cross the 180 when in WGS84.

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Status: Abrir

Comentários

MicahWilliamson

Wow, i am going to promote this because i never knew you couldn't. I don't need this functionality, but i see how it would be invaluable for those who do.

DouglasRidenour

Krotte, you can visualize geometries across the 180 degree meridian in desktop if you use a custom projection on top of the WGS84 datum. We used this when doing buffers across the meridian in USFK. I liked to use the World Plate Carree projection because it looks nice on briefings and is pretty close to the WGS Geographics Default most use (although this works for other projections like web mercator as well). To do this put your data frame in a Projected Coordinate Systems > Plate Carree (World). Next modify the projection by changing the centeral meridian to 180 degrees. This will center your data frame on the Pacific. One thing to keep in mind is that if you use data layers in another projection they will have a line through them at the 180 degree longitude. To get around this do buffers and other created geometries in the modified projection directly and you'll get no line.

GrantHerbert

+1 for this one

GraemeChamberlain

This is real problem for those of us in New Zealand

KyleRotte

Yes, we have used the Plate Caree projection. But when you are in WGS84 a geometry crossing the 180 should be drawn on both sides of the map.

thomaslepkowski

If this inability is not a huge embarrassent to ESRI, it should be. How are we expected to show a flight from Japan to California?

ArcMap is on a computer, not a piece of paper!

Chris Fox

Thank you for posting the idea. I am hoping I might get clarification from everyone who promoted this idea on what they are specifically looking for. As indicated by DougR, if you are looking to display the world in such a way that the 180 degree meridian is displayed in the center of the data frame when viewing the full extent of the world you can do this by customizing the data frame spatial reference. I have taken a screenshot of my map document with this setting applied. Is this the result everyone is looking to accomplish within ArcMap?
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KyleRotte

This works fine if you have a few geometries in a specific area but it if you have them all over the world it is not acceptable to keep changing the properties on your projection. Right now if you have a geometry that crosses the 180 it just falls off the world. A way to fix this would be to do a continuous wrap on the map. This would allow the user to just scrol to the area and have the geometries displayed correctly.

MignonWells2

More than a year since the last post and there still doesn't appear to be a resolution to this problem. You cannot work in area specific coordinate systems when working with a global database and falling off the world is very dark ages.

NickMorgan

Need a continuous wrap of geometries just tried to display a netcdf file with extent from -180.070313 tp 179.929688 . Fine in 2D with the Map properties set to wrap. But can't do the same in 3D globe so I get a stripe at 180. Would help sell ArcGIS Pro for us.

PhilScadden

In dark age of Arc Info 4, ESRI said they would have this solved in "next" version. Waiting... there are partial solutions depending on projections that can take your geometry (often has to be 0:360) and transform into a continuous xy coordinates. Working with actual -180:180 coordinates and recognizing that a line going from 179.99 to -179.34 probably doesnt want to be drawn right around the planet is still not happening. Our homemade software was doing this on a PDP-11 in 1981 so I dont think there is a fundamental problem.

So what do we want? Be able to store geometry in -180:180 including for lines/polygons crossing the the 180. Be able to draw this on 3D globe or in projection of choice (including global projections like mercator) and be able to do spatial calculations and visualizations without worrying about the 180 line.

SteveLewis

You can always change the dataframe to an Albers type projection rather

than its default as Web Mercator. It'll work then

PhilScadden

Nice to know that but really this should work with any projection of users choice. If your map is bringing in tile sets as well then you want to work with the raster projection.

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