221 reputation
13
bio website amherst.edu/people/facstaff/…
location Amherst, MA
age
visits member for 3 years, 11 months
seen Apr 20 at 14:32

Mathematical and Spatial Technology Specialist; Ph.D., 25 years experience in research, teaching, and using and supporting academic technology in higher education.


Mar
4
comment What is the easternmost point in the US?
Choose a coordinate system whose prime meridian is 180° from the geographic center of the U.S. This would pass through Asia. Then every U.S. territory has a positive longitude, and the easternmost point would be the U.S. Virgin Islands. Or, you can just define your universe better and refer to the “contiguous United States”.
Dec
31
answered Why is ArcGIS called ArcGIS?
Dec
21
answered Adding rows of data to a non-spatial table in ArcMap with a SDE SQL Server for Metadata purposes
Sep
20
awarded  Yearling
Sep
17
awarded  Supporter
Sep
17
answered Are “gridded data” and “raster data” the same thing?
Dec
6
answered Is there a way to draw a straight line on a map which also represents a straight line on the earth surface?
Oct
27
answered Why doesn't the Field Calculator work in ArcGis 10?
Sep
20
answered Effectively displaying demographic data on a printed map
Dec
9
awarded  Precognitive
Aug
4
awarded  Teacher
Aug
3
comment What's the difference between a projection and a datum?
Re: "A datum is a reference ellipsoid together with an offset from the center of the Earth." Just to be complete, it may also include a tilt of the axis of the ellipsoid and a scale factor. Geographic coordinates (latitude and longitude) can be off by hundreds of meters if you use the wrong datum. I have an ArcGIS-oriented overview of projections and datums here: ats.amherst.edu/software/gis/mapping_coordinate_data
Jul
30
answered How do I convert State Plane coordinates to latitude-longitude?