The phrase "an extensive map" is correct and usable in written English.
You can use it when describing a map that covers a large area or provides a lot of detail.
Example: "The tourist office provided an extensive map of the city, highlighting all the major attractions and hidden gems."
Alternatives: "a comprehensive map" or "a detailed map."
We also maintain an extensive Map Gallery of SEDAC data.
Massively parallel, short-read sequencing of mRNA libraries was used to generate an extensive map of the transcriptome of the adult, murine neural retina.
The navigational capability displayed by the adult cuckoos in this study indicates the existence of an extensive map sense reaching far outside the area normally traversed by individual birds.
Using publicly available information, personal research and data obtained through collaborations with NGOs and Israel's policy and security community, Dan has overseen the development of an extensive map database relating to the West Bank, Gaza Strip and Jerusalem.
First, we generate an extensive map of the distribution and subseafloor depths of the BSRs in the Nankai subduction margin.
ISRIC has a library and an extensive map collection, mainly from developing countries.
Extensive mapping efforts are currently underway for the establishment of comparative genomics between the model plant, Arabidopsis thaliana and various Brassica species.
This paper provides an extensive mapping of the potential and fate of NG2 cells, a proposed cell of origin for glioma.
Yandex is at an advantage because it already had an extensive maps service — like its U.S. counterpart, Google — and it will be contributing that IP to this operation.
That effort has resulted in the building of an extensive mapping product, Google Maps, but also portals like Google Flights for plane ticket searches and Google Finance for financial news and data.
Such an extensive mapping of cortical electrophysiology was clearly beyond the scope of the present work, which was primarily aimed at evaluating, technically, the general level of accuracy of TMS/hd-EEG.
