Of such magnitude (之大/之高…)

Structure Noun + 之 + degree adjective (大/高/深/广/众) +（assessment）

之 + adjective nominalizes the DEGREE of a noun to exclaim how enormous it is: the noun comes first and 之+adjective follows, working like an abstract noun ("the magnitude of…"). 影响之大，前所未有 = "the magnitude of its impact is unprecedented". It covers 之广 (the breadth), 之众 (how numerous), 之深 (the depth). It belongs to journalism and learned essays, almost always capped by an assessment (前所未有, 令人震惊, 难以想象). Don't confuse it with 之极/之至, which cap an adjective at its utmost: 之大 measures the magnitude of a NOUN.

Examples

这zhè场chǎng改gǎi革gé影yǐng响xiǎng之zhī大dà，前qián所suǒ未wèi有yǒu。
The magnitude of this reform's impact is unprecedented.
事shì件jiàn涉shè及jí范fàn围wéi之zhī广guǎng，令lìng人rén震zhèn惊jīng。
The breadth of the affair's reach is staggering.
这zhè部bù著zhù作zuò影yǐng响xiǎng之zhī深shēn，难nán以yǐ估gū量liáng。
The depth of this work's influence is hard to gauge.
参cān与yù人rén数shù之zhī众zhòng，远yuǎn超chāo预yù期qī。
The sheer number of participants far exceeded expectations.

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