- DIFFERENCE BETWEEN TRANSCAD AND ARCGIS HOW TO
- DIFFERENCE BETWEEN TRANSCAD AND ARCGIS FULL
- DIFFERENCE BETWEEN TRANSCAD AND ARCGIS PRO
The Project tool converts all coordinates from one coordinate system to another by unprojecting the data into geographic coordinates (latitude and longitude). It won’t change the actual coordinate values. It reassigns the coordinate system information in the metadata. The Define Projection tool is used mainly when data has an unknown coordinate system. What’s the Difference between the Define Projection tool and the Project tool? The numbers from these sources don’t overlap, so there’s no need to worry about which authority defined the WKID. The authority for each WKID number will be either Esri or EPSG, which indicates the European Petroleum Survey Group, a now-defunct organization that was absorbed by the Geomatics Committee of the International Association of Oil and Gas Producers in 2005. Once you know this number, it’s a handy way to search for the coordinate system later.
DIFFERENCE BETWEEN TRANSCAD AND ARCGIS PRO
You can find the WKID in the Coordinate Systems Details window by right-clicking the layer in the ArcGIS Pro Contents pane and choosing Properties > Source > Spatial Reference. If you save the projection file (.prj) for any coordinate system and open it in a text editor, you will see its WKT.Ī WKID is a unique number assigned to a coordinate system. WKT is a string that defines all necessary parameters of a coordinate system. Well-known text (WKT) and well-known ID (WKID) both provide ways of identifying coordinate systems, so you can exactly specify parameters. What’s the Difference between WKT and WKID? A projection is not a coordinate system it’s an algorithm that is used to create a PCS. These values can be used to center the PCS on different parts of the world.Īs its name implies, a PCS is a coordinate system.
In addition to a projection, a PCS includes a geographic coordinate system that defines the earth model a unit (often meters) and a set of parameter values, such as false easting, central meridian, or standard parallel, that vary depending on the projection.
DIFFERENCE BETWEEN TRANSCAD AND ARCGIS FULL
All the supported map projections available in ArcGIS are listed in the ArcGIS Pro online help.Ī PCS is the full definition of how a specific round earth model is projected onto a flat map.
DIFFERENCE BETWEEN TRANSCAD AND ARCGIS HOW TO
The projection is the mathematical algorithm that defines how to present the round earth on a flat map. What’s the Difference between a Projection and a Projected Coordinate System?Ī projection is one parameter in a PCS. The datum includes a spheroid, which is defined by its semi-major axis, semiminor axis, and inverse flattening values. In addition to a datum, a GCS includes a prime meridian that specifies the location of 0° longitude and an angular unit, which is often degrees. Since the earth’s surface is not perfectly smooth or round, there are many different datums designed for different parts of the world.Ī GCS is the full definition of how coordinate values are tied to real locations on the earth. It is the part of the GCS that determines which model (spheroid) is used to represent the earth’s surface and where it is positioned relative to the surface. Projected Coordinate Systems.” What’s the Difference between a Datum and a Geographic Coordinate System?Ī datum is one parameter in a GCS.
To learn more, see my ArcGIS Blog post “ Geographic vs. Its units are linear, most commonly meters. It contains a GCS, but it converts that GCS into a flat surface, using math (the projection algorithm) and other parameters.
Its units are angular and are usually degrees.Ī projected coordinate system (PCS) is flat. It’s shaped like a globe, so its spherical. What’s the Difference between a GCS and a PCS?Ī geographic coordinate system (GCS) is a reference framework that defines the locations of features on a model of the earth.