This dataset represents aspect, the horizontal direction the mountain slope faces, for the Northeast, including Canada. The cool aspect represents the North-facing slope and the warm aspect represents the South-facing slope.

This dataset is derived from the following source:

30 meter Digital Elevation Model (DEM) for the Northeast (projected to NAD Albers 83) that was created by mosaicing two datasets:

1. U.S. Geological Survey's (USGS) 30 meter National Elevation Dataset (NED) , ~1 arc-second data that is updated over large areas by integrating the 10 meter or better source data (where available), re-sampled to 1 arc-second.
2. The Canadian Digital Elevation Data, Level 1 (CDED1) The Center of Topographic Information (CTI) jointly produces the CDED with federal, provincial, and territorial government agencies as well as the private sector. The CDED consists of an ordered array of ground or reflective surface elevations, recorded in meters, at regularly spaced intervals. Time period (1980-03-01 to 2006-04-18)
The CDED1 was 24 meter cells aggregated to 30 meter cells to match the U.S.G.S. NED.

-The Northeast region was extracted from the grid and aspect was calculated (ArcMap geoprocessing tool "aspect")

-No Data cells were excluded