Goodbye NAD 83 and NAVD 88

Back in 2015 I wrote about the planned retirement of NAD 83 and NAVD 88.  Well, it’s almost here.  The new replacement datums are coming in 2022.

To improve the National Spatial Reference System (NSRS), NGS will replace the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88) with a new geometric reference frame and geopotential datum in 2022.

The new reference frames Continue reading

Whale Mapping

Most of us using GIS today do not get to do much mapping of whales, but back in the mid 19th century the American whaling trade was big business and you needed to know where the whales were.

Check out this innovative map from 1851 showing the distribution of several different species of whales, identifying each with a combination of color and pictorial symbols.  The map shows at that time that the Pacific Ocean was the primary habitat for whales.  The Atlantic Ocean was not because the whale resources there had been terribly depleted.  Check it out!