How to Convert the Projection of a Map in Surfer 9NewsletterHome
There is a new feature in Surfer 9 that allows the user to convert the projection of a dataset from within Surfer’s worksheet window. This tool has proven to be extremely useful to users who incorporate data from multiple sources and would like all of their maps and data to be in the same coordinate system. This new Surfer feature allows for complete data integration. Surfer has more than 1500 pre-defined coordinate systems to choose from, including the most widely used systems in the industry. There is also option to reference coordinate systems that are custom defined by the user. In order to provide a good, working example of how to convert projections in Surfer 9, a free Digital Elevation Model (DEM) of Honolulu was downloaded from the USGS in UTM coordinates. Although this article uses a DEM file, you can use any grid file. This article will show how to create a map of the original DEM file and then walk through the steps necessary to convert the coordinates of the map from UTM to latitude and longitude. If you simply want to convert the data in an XYZ data file, without starting from a map or grid file first, you can start at Step 3. Step 1. Display the Original DEM: It is a good idea to display your data before any conversion process is started to get a feeling of the coordinate units displayed on the X and Y axes. To display the DEM, a contour map and 3D surface layer are generated. Step 2. Convert the DEM to an XYZ Data File: The coordinate conversion process only works on XYZ data in Surfers worksheet window. If you don’t have the source XYZ data file for the grid you are working with, you must convert the grid to an XYZ data file. This is easily done in Surfer, the step are as follows: The coordinate conversion process takes place in Surfer’s worksheet window. To convert the coordinates, follow these steps: The result is a grid file that has a different coordinate system than the original DEM. You can create a contour map and a 3D surface layer, similar to the first image in this article. You will notice that the axis on the map now displays the converted latitude and longitude coordinate units. Thanks To Golden Group and her smart and genius technical team. Keeps doing innovations. We’re following you. Ahmet E. Mengen You know, every time I’ve ever had to re-build a computer, Golden [Software] has always been by far and away the easiest company to deal with. Bradley Joyce GIS Manager I can’t work without your product. Fantastic stuff. Russell L Thomas Jr Senior Geotechnical Engineer Copyright © 2016 Golden Software, LLC. All rights reserved. The names and logos for Surfer, Grapher, Voxler, MapViewer, Didger, Strater and Golden Software are registered trademarks of Golden Software, LLC. Source.