• Listing Transformations for an Area with ArcMap and ArcPy

    A common question asked when working with Coordinate Reference Systems (CRS) in ArcMap is not only how to transform between different CRS but simply what transformations are available between two CRS in a given area? ...
    spk578
    last modified by spk578
  • The Antipodes...finding summer all year long!

    What is an antipode? Any point on the surface of a sphere, in this case the Earth, that lies diametrically opposite from a given point on the same surface, so that a line drawn between the two points through the cente...
    spk578
    last modified by spk578
  • The European Datum: A History (Part 1)

    Introduction Considering the de facto use of the European datum of 1950 (ED50) throughout the oil industry operating in Northern Europe and the North Sea, I thought it would be interesting to explore this datum’...
    spk578
    last modified by spk578
  • Back to basics: NASA explains Geodesy

    Geodesy is defined as the science of accurately measuring and understanding the Earth's geometric shape, orientation in space, and gravity field.  Or, as NASA puts it, it is the study of where you are, where you'...
    spk578
    created by spk578
  • New map projections supported in ArcGIS 10.4

    ArcGIS 10.4 now supports eight small-scale map projections displayed in an animated gif: Compact Miller Patterson Natural Earth Natural Earth II Wagner IV Wagner V Wagner VII Eckert-Greifendorff   The Eckert-Gr...
    BSavric-esristaff
    last modified by BSavric-esristaff
  • Geodetic Integrity...It’s basically like Vitamin C!

    Whilst not a blog written out on this site I thought this link was worth sharing. It discusses geodetic integrity and provides some nice insights into geodesy in the Oil and Gas Industry...positional integrity is so i...
    spk578
    last modified by spk578
  • An easier search for CRS and their details?

    An easier place to search for coordinate systems... If you need a quick and easy to use resource for coordinate systems search try: EPSG.io. This is an open source web-service providing a database based on the officia...
    spk578
    last modified by spk578
  • When should I use the Define Projection tool and the Project tool?

    There are two tools in ArcGIS Desktop associated with using coordinate reference systems that often cause confusion. I believe these confusions are mainly sourced from the semantics surrounding projections and the too...
    spk578
    last modified by spk578
  • Correctly Aligning Features in ArcMap

    "It is vitally important to understand the difference between changing the coordinate reference system (CRS) property of a geographic dataset and converting the feature coordinates of a geographic dataset to a differe...
    spk578
    last modified by spk578
  • Using OGP's EPSG Area Polygons

    The International Association of Oil and Gas Producers (OGP) released EPSG Area Polygons in 2012 as a freely available spatial dataset that accurately defines the applicable extent of the CRSs and transformations in t...
    spk578
    last modified by spk578