How to align "pages of floats" to the top margin?

If I include [p] in the placement specifier of a \begin{figure} environment, figure floats may be placed on a dedicated page. However, at 开发者_StackOverflowleast in the "book" document class, floats are centered vertically on those pages.

How do I force all "pages-o-floats" to be aligned to the top margin (just like normal text pages)?

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I believe your answer is in the UK TeX FAQ:

\@fptop defines the distance from the top of the page to the top of the first float

The simple fix is to reset \@fptop in your preamble:

\makeatletter
\setlength{\@fptop}{0pt}
\makeatother

However, you might find that this is a bit too high, so you might want something like 5pt instead. (Anyway, the FAQ entry is well worth reading; it explains in more depth what's going on than I am here.)

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can you not use the [t] specifier instead of [p]?