Are the external servers very loaded for US NED Data?

exploretheworld

Are the external servers very loaded for downloading US NED Data using Global Mapper? I have only been able to download small areas the last day. I tried using the USGS Seamless Map website for downloading but I cannot find the options to use an import file of my own or NAD 27.
Does it have these options? If so, where I can find them. I tried downloading an area using NAD83 but I couldn't even download that map anyway. It gave me some error message. Do you
if traffic will go down soon on the external servers for NED Data?

global_mapper

The JPL server from which the NED, SRTM, and Landsat7 data served using the File->Download Online Imagery menu command has become very overloaded lately. There isn't anything that we can do about that. Hopefully they will increase capacity at some point, or perhaps the recent spike in demand will level off.

You should be able to get an Arc Grid or GeoTIFF file from the USGS Seamless Map web site for NED data from your area and then load that into Global Mapper. It doesn't matter what datum that you get from the seamless site as you can always convert the datum in Global Mapper to what you need.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

exploretheworld

I downloaded an entire county from USGS Seamless and have converted to my preferred datum.
When I export an xyz grid from Global Mapper I usually have a line or set of lines which each contain a set of stations and coordinates. From this big chunk of land I have downloaded, can I use Global Mapper to pick a set or sets of stations and coords to create a file and use it to extract the elevations from xyz grid I have already downloaded?

global_mapper

If you have terrain loaded (like a DEM file from USGS Seamless) and your set of stations loaded as points, you can then export them to several formats under the File->Export Vector command and choose to have elevations automatically added. This includes CSV, Simple ASCII, Shapefile, and DXF.

Another option is to simply select your points using the Digitizer Tool, then right click and choose to have elevation values added using the loaded terrain. You can then export those new 3D points to any supported vector format.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

exploretheworld

Using Vector data option, how do we connect both the file with the stations and the file with elevations?

global_mapper

If you are doing a vector export, just check the box on the export options dialog to include elevations with each feature. There should be an option like this on the CSV, DXF, Shapefile, and Simple ASCII exports.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com

exploretheworld

Should I have both station file and elevation file from USGS open at the same time in Global Mapper or not? Can you walk me step by step. Thanks I would appreciate it.

global_mapper

Yes, you need to open them both. Just do the following:

1) Load both the elevation file and the station points
2) Select the File->Export Vector->Export Simple ASCII Text File (or whatever other format that you want) menu command
3) Check the box to include elevations for each vertex, then press OK to export the new file.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Support
support@globalmapper.com