Hi,
If you have co-ordinates in degrees, then what you have is
Longitude/Latitude (WGS84), as UTM (Universal Transverse Mercator) system
is exclusively a metre grid system. If you wish to convert from
Longitude/Latitude (WGS84) degree to UTM metres, here is one way you can do
it. First create a table with your point or points, as longitude and
latitude, the "projection" for this table must be Longitude/Latitude
(WGS84).
Like this say:
Point is Character (5), Lon and Lat are Decimal (9,5) Easting and
Northing are Decimal (10,1)
Leave Easting and Northing columns empty.
Point Lon Lat
Easting Northing
A 01.000 deg E 57.000 deg N
B ------- -------
C ------- -------
Open a map window, and a browser with your table (WGS.tab for example)
Then select Table:Create Points
In the dialogue "create points", select your table, and set "get X co-or
dinates from column" to Lon column, set "get Y co-ordinates from column" to
Lat column. Click OK. Your points will be created from the Lon and Lat
values you have entered.
Next, use File: Save Copy As to save a copy of your table, but set the
projection as "UTM Zone 18, Northern Hemisphere (WGS 84)" if that's what
you wish. Call this copy UTM.tab maybe.
Open the new table, and then select Table:Update Column.
In the Update Column dialogue, the Table to update is UTM.tab , Column to
Update is Easting, Get Value from table is also UTM.tab. For Value, click
Assist, and select CentroidX from functions. Click OK, this will enter the
UTM easting in the Easting column.
Then select Table:Update Column again.
In the Update Column dialogue, the Table to update is UTM.tab , Column to
Update is Northing, Get Value from table is also UTM.tab. For Value, click
Assist, and select CentroidY from functions. Click OK, this will enter the
UTM northing in the Northing column.
To do the opposite, start off with a table with UTM easting and northings
entered, empty columns for Lon & Lat, and projection set as "UTM Zone 18,
Northern Hemisphere (WGS 84)", create the points, then save the copy as
Longitude/Latitude (WGS84). And update Lon and Lat columns.
Does this all make sense?
One thing to confirm before you start is that the coordinates you have are
definitely WGS84 ellipsoid for both the Longitude/Latitude and UTM.
Regards,
Andy
-----Original Message-----
From: Jiang yuwu [SMTP:[EMAIL PROTECTED]]
Sent: 30 March 2000 16:38
To: [EMAIL PROTECTED]
Subject: MI HOW TO CONVERT "DEGREE" TO "METER"
<< File: ATT00002.txt; charset = gb2312 >> << File: ATT00003.htm; charset
= gb2312 >>
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