How can we increase vertical and horizontal resolution in seismic data acquisition?

The horizontal resolution in seismic data aquisition provides is a function of the trace spacing within the3D data volume. As the separation between adjacent traces decreases, horizontal resolution increases

Are you talking about wavelenght at an acquisition level? Depends of so many factors that is impossible to talk without writing a book. Talking only on an acquisition level, depends on the depth of your target (more depth, less resolution), the kind of source (explosive, vibro, airgun), the receiver type (specifications) and receiver space, the kind of subsurface geology, the offset, the strenght of the signal, the random and coherent noise, the source space and strenght (and arrays), the source depth, the FOLD and the topography. Using aceletometers can help you out to improve your vertical resolution, and you can reduce sources and receiver spacing to improve horizontal resolution, or avoid aliasing if you have step dips. But depends a lot of your target depth, your receiver and your source...and of course the noise and earth dispersion/attenuation/etc. You need to analize the parameters of you old seismic acquisition and trying to improve the things you need to improve: increasing the fold always help a little bit with the resolution and on land seismic, if you get rid of ground roll using receiver arrays you improve a lot the near traces and then resolution, AND MOST IMPORTANT: you need to analize the seismic processing steps. Maybe you only need to reprocess your data with more care (mute, filters, noise)...but this is another approach different from acquisition.