I'm trying to find elevation data for the whole globe for a simple mapping application and I'm not having any luck. I really don't want anything fancy, just something like a 4000x2000 raster of elevation values across the globe would be fine. I plan to colormap and interpolate it myself. Does anyone know where I might find something like this?
You might consider the Shuttle Radar Topography Mission (SRTM) 30 product, which is a coarse resolution near-global 30-arcsecond DEM. You can download the data at the following FTP site:
There is also the GTOPO30 elevation data set that is commonly used for these applications.
The GTOPO30 dataset has been replaced by the Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010), available here, which uses a combination of available elevation data sources (e.g. SRTM, Canadian elevation data, SPOT) to create a multi-source global dataset. Credit goes to Vince for pointing this out.