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Add Long/Lat point into the ArcMap   Sharon Cai Oct 01, 2003
Re: Add Long/Lat point into the ArcMap   Melita Kennedy Oct 01, 2003
Re: Add Long/Lat point into the ArcMap   Sharon Cai Oct 02, 2003
Re: Add Long/Lat point into the ArcMap   Paul Finer Oct 02, 2003
Re: Add Long/Lat point into the ArcMap   Sharon Cai Oct 02, 2003
Re: Add Long/Lat point into the ArcMap   Melita Kennedy Oct 02, 2003
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Subject Add Long/Lat point into the ArcMap 
Author Sharon Cai 
Date Oct 01, 2003 
Message I have a text file with a set of Long/Lat number for a point layer. But after I add this point layer into the Map, it does not match with my current layer. I did as the following:

1. Add the existing map layer and set the map frame's coordinae system as the same as this layer.
2. Add The Long/Lat by the Tool-AddXY
3. Export the point layer with the same projection system as the map's frame.

Then they are still not matched.

Thanks
Sharon
 
   
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Subject Re: Add Long/Lat point into the ArcMap 
Author Melita Kennedy 
Date Oct 01, 2003 
Message Did you define the coordinate system for the XY data when you created
it? Did the data line up before you exported it? If it didn't, exporting
it isn't going to help.

If you add just the Long/Lat data to a new map, do the points show
up in the correct geographic locations? Make sure that the proper
columns are assigned to the x and y values. Also confirm that the
long/lat data is in true decimal degrees and not in a packed DMS
format like 40.3015 (40 deg 30 min 15 sec).

Melita 
  Melita Kennedy
ESRI Product Specialist 
   
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Subject Re: Add Long/Lat point into the ArcMap 
Author Sharon Cai 
Date Oct 02, 2003 
Message I defined the coordinate system when I created the XY data. The XY data could be seen when I exported it. But it can't be matched with other layer.

I am not sure the XY's format here. For example. the X here is:
-73918033, the Y is 40844593. I got the data from other company. What information else shall I request except just a set of X,Y data?

Thanks!
Sharon
 
   
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Subject Re: Add Long/Lat point into the ArcMap 
Author Paul Finer 
Date Oct 02, 2003 
Message You gave an example where "the X is -73918033, the Y is 40844593". This sure seems like the longitude is -73.918033 (decimal degrees)and the latitude is 40.844593 since, if it were packed DMS, you'd have minute and second values of 60 or more. 
   
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Subject Re: Add Long/Lat point into the ArcMap 
Author Sharon Cai 
Date Oct 02, 2003 
Message So, if I just have a set of these XY data, can I import it the the Map and to match another layer which has the following coordinate system?

NAD_1983_StatePlane_New_York_Long_Island_FIPS_3104_Feet
Lambert_Conformal_Conic
False_Easting: 984250.000000
False_Northing: 0.000000
Central_Meridian: -74.000000
Standard_Parallel_1: 40.666667
Standard_Parallel_2: 41.033333
Latitude_Of_Origin: 40.166667

GCS_North_American_1983

Thanks!

Sharon

 
   
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Subject Re: Add Long/Lat point into the ArcMap 
Author Melita Kennedy 
Date Oct 02, 2003 
Message ] X here is: -73918033, the Y is 40844593.

I agree with Paul. If you can ask the other company to provide the data
with changes, ask them to do two things.

1) Format the xy values as decimal degrees. ex. -73.918033 40.844593

otherwise, you'll have to do it before you can import it into ArcMap.

2) Ask them to confirm the coordinate system as NAD83 or WGS84 or
something else. It's almost certainly one of these, but better to be sure!

Once you can get this data imported, you can project it on-the-fly to
the Long Island coordinate system.

Melita 
  Melita Kennedy
ESRI Product Specialist