Using the Map

While the map is largely intuitive, there are some quirks which are useful to know about.


Top of Map, Left Side

Zoom In / Out

The map is very responsive to mouse or finger movements. The opening view is of Nelson (our area of study) but the map will expand to a much larger area, since it is based on GIS technology. If the map zooms out of control, simply press the home key to return to the original view.

Magnifying glass, dark: This is a search function, specific to the Lot ID. The lot ID’s are indicated at any of the articles which are tagged for the building site project.

Clock: Clicking this activates the timeline, which appears at the bottom of the map. The timeline runs at two speeds (you can select).

It starts as a single moving point in time, but you can manipulate it to create a span of years.


Activate the looking glass. This gives you a movable circle which reveals the Lidar (topography) underneath.


Magnifying glass, light: This allows you to search by current street address.


Top of Map, Right Side



The map is set to a default view which reveals the area of the subject matter. In the more densely settled areas this puts the cellar hole icons close together, and not all of them are visible. However if you zoom out (using the + – tool, or using mouse or finger movement (on tablets) those will be revealed. Clicking on the icon will give you information about that site. If you click on an icon and there are others “underneath” it, the additional information may be revealed in the pop-up box.


The Location ID is our internal reference, based on a commonly used grid format. The Struthers and Wadsworth IDs refer to the two main sources we have for this information – you can read more about that here.  In many cases we have a short article about the location, which you can reach through the More Info link.


Map Facts

The roads and cellar holes indicated on the map contain two areas which are no longer part of Nelson. In the southwest, some land in the current town of Roxbury was part of Packersfield (an earlier name for Nelson). This became part of Roxbury in 1812, therefore the information provided on the map and related documents is only prior to this time – we did not continue to track activity. The town of Harrisville was formed out of the southern part of Nelson and the northern part of Dublin. It was incorporated in 1870, making it one of the younger towns in New Hampshire. Roads and cellar holes in this area are therefore document until that time, but again, we did not track anything after that time.

Research for this project has been going on since 2002, led by Rick Church and Dave Birchenough. But it remains a work in progress, with further exploration and serendipitous revelations continuing to yield new data. Users of this site who have information that could supplement this effort can direct correspondence to Rick.