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When using data with different coordinate systems which coordinate system is used when ArcMap Reproject data on the fly?
Projection on the fly ensures that the data draws in the map’s coordinate system (NAD 1983 CSRS Statistics Canada Lambert), even though it is still stored in two other coordinate systems (WGS 1984 and WGS 1984 Web Mercator). ArcGIS will always apply projection on the fly when it’s needed.
How do you change the coordinate of a data frame?
Changing the data frame’s coordinate system
- Right-click the data frame name and choose Properties to bring up the Data Frame Properties dialog box.
- Click the Coordinate System tab and navigate to the desired coordinate system for your map display.
How do I add a second data frame in Arcmap?
On the main menu, click Insert > Data Frame. A new data frame appears on the page layout. Drag the new data frame below the Layers data frame. on the Standard toolbar.
Why is it important to understand your data before projecting it?
It is important for a GIS analyst to have a thorough understanding of map projections and coordinate systems. Without coordinates associated with the geographic data (points, lines, polygons or rasters) ArcMap would not know where to place the different layers in relation to each other.
Is the data frame in the same coordinate system?
In this example I selected as a coordinate system for the data frame, the same coordinate system as the layer “admindivisions” (GCS_GDA_1994). Ideally, when you are working on a GIS project, all your layers and your data frame should be set in the same coordinate system.
Can a data layer be in two different coordinate systems?
However, in most cases you will be working with data layers in different coordinate systems. Every time you load a layer that is in a different coordinate system than your data frame, the program will warn you and ask you whether you want to transform the layer to match the coordinate system of the data frame.
When do you need to use a coordinate system?
In some documentation external to SPICE, this is called a “coordinate frame.” A coordinate systemspecifies a mechanism for locating points within a reference frame. When producing or using state (position and velocity) or orientation (pointing) data, one needs to understand both the reference frame and the coordinate system being used.
How is the data frame able to project on the fly?
By default, the data frame acquires the coordinate system of the first layer added to your table of contents. However the data frame is able to project “on the fly”: to align layers correctly – for visualization purposes only – even though these may differ in DATUM or Coordinate Systems.