I'm getting from GPS data in the form of NMEA. There I'm getting positive latitude and longitude values('N' and 'E').
How do I convert the negative latitude and longitude values('S' and 'W') into decimal degree format.
[GIS] How to convert negative NMEA latitude and longitude values (‘S’ and ‘W’)
gpslatitude longitudenmea
Related Solutions
Your coordinates are likely in UTM (Universal Transverse Mercator) Eastings and Northings.
You can convert UTM coordinates to lat/long online using many different sites. Here in one. You can also perform this calculation in excel or inside of a database if you can work out the formula. Alternatively you can perform the conversion inside of a GIS such as QGIS or ArcGIS.
Before you can convert coordinates to lat/long you will need to know which UTM zone your coordinates fall in.
Here is an example for North America:
In this example, most of Florida falls within the UTM zone 17N.
I came across this page by searching 'batch convert UTM to lat/long'.
This is giving you the lat/long for your geometry, but it looks like your data is in some sort of feet-based projection like state plane. If you're wanting to display the coordinates in a system that's readable by Google Maps, you'll need to transform the point. Not sure about the syntax for SDE in Oracle, but in PostGIS it's something similar to:
select st_astext(st_transform(shape, 4326))
For additional information see the help page.
Best Answer
Have a look at this tutorial. It may be able to help you out. Also, depending on how you are getting the data, you may have built in ways to convert it. For instance, if you're reading the NMEA stream via something like a Trimble SDK, they usually have converters in there.
I also remember that if you're using a .NET program, there were numerous converters out there as open source. For my application build in .NET, I ended up just writing my own algorithm to convert NMEA streams to decimal degrees.
This post outlines some programming parts to it. If you're not looking to use a programmatic method to convert it, there are converters online such as this one from the US FTC.