Bob and I have been discussing this, but I thought it would be of general interest. These two maps are quite different from the other NJGIN maps since they only cover selected areas, and the "wetlands" title is misleading. But if you look at the map metadata, you'll see that they were created for a very specific purpose. Here's the 1970 metadata and a selected quote that helps explain what they were created for https://www.arcgis.com/sharing/rest...adata/metadata.xml?format=default&output=html "This set of photo-basemaps was originally produced to support the "Wetlands Act of 1970 ", (N.J.S.A. 13:9A-1, ET. SEQ). Although identified as the 1970 Wetlands Basemaps, the aerial photographs used to generate the basemaps were actually taken in several years; 1971, 1972, and 1977." "These basemaps include the original delineations of the wetlands species vegetation used to map the tidal wetlands for the act. Also included is the delineation of the Upper Wetlands Boundary (UWB)." And here is the 1977 metadata and a quote https://www.arcgis.com/sharing/rest...adata/metadata.xml?format=default&output=html The photo-basemaps were originally produced to support the "Tidelands Act" (N.J.S.A. 12:3). The original basemaps were mylar photo-images at a scale of 1:2400 (1 inch = 200 feet), and were the base on which the state's riparian land holdings were mapped. For the purposes of the act, riparian lands are defined as all areas that are now or formerly flowed at mean high tide by a natural waterway. [ . . . . ] Although identified as the 1977 Tidelands Basemaps, the aerial photographs used to generate the basemaps were actually taken over the course of two years, 1977 and 1978. So, the bottom line is that the 1970 imagery is called "wetlands" because it was produced to support the "Wetlands Act of 1970" and the 1977 imagery is called "tidelands" because it supports the "Tidelands Act". Also note that the so-called 1970 imagery was actually shot in 1971, 1972 and 1977.