Problems using the imagesc command

I have three vectors: latitude (size 12005x1), longitude (size 12005x1), and H (size 201x12005).

I would like to plot a map of them, so I used the imagesc function. However, what I get are streaks or stripes rather than getting a map.

What I used was this:

imagesc(lon,lat,H);axis('xy');colorbar

Could someone tell me how I can fix this?Did I have to have done any manipulation in the data before to get a map?

Thanks.

[Adam]

We've no idea what is in H, but judging from your code, what is in H is what you see in your figure. Although I don't know quite why you have shown two plots as you only seem to be doing one imagesc call.