Golden Software Technical Support • Map projections question

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. Please be sure you specified the correct coordinate system for each of the map layers, in addition to the map. The map layers should each be assigned the original coordinate system for the data/grid/base map file used to create the layer. Then, select Map in the Object Manager and change the coordinate system for the map. This is what the map is going to be displayed with in the plot window. It sounds like you want the Map to be set to Stereographic. If the layers and the map are all in Stereographic, then there should not be any change visually to what you see after setting the coordinate system. When the data file is imported unreferenced, it is already in Stereographic coordinate system. Since the layers and the map are all the same, the map doesn't change. You would only see a change if the layers and the map are in different coordinate systems. For example, you could create a contour map, set the Contours layer to UTM (that's the coordinate system for the coordinates in the grid file), and set the Map to Stereographic (that's the coordinate system the map will ultimately be displayed in). After setting the coordinate system for the layer, you would then see quite a difference when changing the coordinate system of the map to Stereographic. I have a base map which in rectangular projection and i need to display it in stereographic projection and post data on it. But assigning projection to it doesn't work. Yes, you can change the map projection to anything you want. But you need to make sure you 1) set a coordinate system for the Base layer (this is the original coordinate system for the file used to create the base layer), and 2) you are changing the coordinate system for the Map, not the Base layer (this is the coordinate system you want the map to be displayed in, Stereographic). So first, make sure the Base layer has a coordinate system assigned to it (this may not be Stereographic). Then, select the Map and change the coordinate system of the map to be Stereographic, and make sure the projection settings (i.e. Central Longitude and Central Latitude) are entered correctly. That will convert the base layer to the stereographic projection of the map. If you want to add an additional post layer to it, you can (Map | Add | Post Layer). Be sure you specify the correct coordinate system for the post layer and the correct X and Y columns in the data file. If this is not working as you expect, please zip and email me the SRF file showing the map that is not working. Also, please tell me the coordinate system of the file used to create the base map, and the coordinate system of the data points in the data file used to create the post layer. Basemap already in WGS84 Unprojected Lat/Lon and when i try to set Map coordinate system to be Stereographic (Predefined-Templates-Stereographic) i get error from Surfer (std exception: ...). I managed to convert my map to Mercator projection (which also needed for my task) but now Lat/Lon axis in some strange units. Is it possible to set degrees values for them? Yes, Surfer 10 did have a problem converting a world map to Stereographic. Usually the Stereographic projection is not used for such a large area (usually it is just for a continent, or the polar regions, not the entire world) and doing so caused some issues. These issues have been fixed in Surfer 11 and Surfer 12. The native units for the Mercator projection are meters. When you convert a map to Mercator, the axes will report meters. The grid lines in meters are different than the lat/long graticule lines you would see. There is not a way to display the lat/long graticule lines on a projected map. I will add your vote to this request on the suggestion file. One workaround is to convert the map to Lat/Long, turn off the map layer (uncheck the layer in the Object Manager), and turn on the grid lines for the axes (so you just see the grid lines), and export to a DXF file. Then convert the map back to whatever projection you want, and turn the map layer back on. Click Map | Add | Bsae Layer and import the DXF file back in. These are the lat/long lines and they'll be curved and spaced appropriate (or not if the projection does not have curved lat/long lines). If you left the axis labels on when you exported to the DXF file, then the lines will have the labels also. I wanted to let you know that Surfer 13 (available today) now supports adding a graticule to your map. If you have a projected map, you can add a lat/long graticule to it, so you have the meters of the projection on the axis labels, and labeled lat/long graticule lines on top. You might want to check out the Source.


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Last Modified: December 30, 2014 @ 12:00 am