OpenStreetMap Spring #Editathon

Posted by & filed under GIS.

Come join us for the OpenStreetmap #editathon in Denver. All over the United States, starting at 10 Mountain time going until 4pm Mountain time, volunteers will be improving the US on OpenStreetMap. You can join us in Denver, or at one of the other locations across the country or virtually on our IRC channel… Read more »

Delaware State High Point: Ebright Azimuth

Posted by & filed under America, GIS, Nature, Playground.

Canadian rockers Moxy Früvous would have you believe that the US state with the lowest highest point is in Delaware. (Moxy Früvous – The Lowest Highest Point from some shady website)  In the beginning of the song, they say that they would expect it to be Florida or Louisiana, and they would have been correct… Read more »

Pennsylvania’s Highest Point: Mount Davis

Posted by & filed under America, GIS.

On our trip back home from Pittsburgh, we decided that an excellent place to stop would be the highest point in Pennsylvania.  I have never been a highpointer, but after my first state high point adventure, I can easily understand how addictive it can be! The Mount Davis high point is located on a mountain… Read more »

ESRI Shapefile Shapes and Parts and KML analogies

Posted by & filed under GIS, Uncategorized.

ESRI shapefiles are split up into “Shapes” which are split further into “Parts”. For example: One could think of a college or corporate campus as a group of buildings.  The individual buildings could be stored as “Parts” and the entire campus could be stored as a group. KML files work in a similar fashion, although… Read more »

Determining if a Polygon is drawn clockwise or counterclockwise

Posted by & filed under GIS, Technology.

According to the ESRI Shapefile Documentation, “The neighborhood to the right of an observer walking along the ring in vertex order is the inside of the polygon”.  Meaning that all normal or “clean” polygons are drawn in a clockwise fashion.  When it comes to holes in the polygons, these are defined by a counterclockwise path delineating… Read more »