# Workshop: Finding and Georeferencing an Historical Map Explore one of the databases discussed in the presentation and download an historical map of interest (or use one of your own if you already have one!). Then, using the MapWarper online tool, georeference your map with at least 4 points. ### Possible Mapping Geodatabases * **David Rumsey Map Collection (**[**https://www.davidrumsey.com/**](https://www.davidrumsey.com/)**)** * **Library of Congress Map Collection (**[**https://www.loc.gov/maps/**](https://www.loc.gov/maps/)**)** * **USGS Historical Topographic Map Explorer (**[**https://livingatlas.arcgis.com/topoexplorer/index.html**](https://livingatlas.arcgis.com/topoexplorer/index.html)**)** ### **Redlining Map Option** * To look at your data against an historical Boston redlining map, we recommend using one of the ["Residential Security Maps"](https://collections.leventhalmap.org/search/commonwealth:00000x52b) from the Boston Public library. Georeferenced version of the redlining map: ``` https://mapwarper.net/maps/tile/65580/{z}/{x}/{y}.png ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bcds.gitbook.io/learn/digital-scholarship-incubator/topics/mapping-and-gis/an-introduction-to-raster-data-and-georeferencing-historical-maps/workshop-finding-and-georeferencing-an-historical-map.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.