Frequently Asked Questions

Here a few of the frequently asked questions about the Interactive Maps.

Why does (Agriculture, Forest, Wetlands) Loss not reflect all of the loss?

The "Loss" frame in the animation shows only the lost of either agriculture, forest, or wetlands loss to urbanization. For example, agricultural land transitioning to forest would not be included in the loss. You may also experience that the red "loss" polygons do not reflect the extent of development on the aerial photographs. This is likely due to the fact that the development was underconstruction in 2007 and thus partly "barren or transitional lands" and not urban, thus not reflected.

Why is development on the map not reflected in your data?

In some places, the aerial photography provided by Google is more recent than 2007.

Why don't you use the NJ 2007 aerial photography as your base map?

While using the 2007 aerial photography would match the 2007 LULC data as they are derived from the same source, hosting a tiled version of the 2007 data would have been a significant task for this initial release. We may consider adding the historic NJ aerial photography at a later date.

How can I view Birds Eye view in a larger window?

After clicking on or panning the map to activate Birds Eye View, you can click on the blue plus sign at the top right of the window to launch Birds Eye in a new window. This window will still be linked to the map and will follow your movements.

Why does the Birds Eye show development under construction, while the same area is complete on the aerial photograph?

These maps are truly mashups, in that we are incorporating technology and data from several data sources. On occasion, the Birds Eye view may be significantly dated in comparison to the map's aerial photography.

What are your source data sets?

For all of the land use/land cover derived data, the DEP LULC data for the time period was used. Some of the data (agriculture, forest, wetlands) was rasterized for the analysis.

Watershed boundaries are the HUC11 boundaries. Rivers are from the stateriv.shp DEP dataset.

The open space datasets included the NJDEP, federal and state preserved open space layers and additional open space data developed at CRSSA. This includes farmland preservation parcels as of 2009 acquired from the NJ Department of Agriculture (NJSADC FPP 2010).

Do you have a question not answered here? Please contact us.

© Geospatial Research Lab, Rowan University