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When you begin editing, if you receive a warning message about the coordinate system of the data layer not matching the data frame, you can change the coordinate system of the data frame: The coordinate system of the data frame does not change the coordinate systems of the individual data layers. Rather, it changes how the data are displayed on the screen. You may see your data stretch and distort as you change the coordinate system of the data frame. : Use a flat, 2D surface and units are in meters, miles, etc. Area, length, direction, or angles will be distorted. When transforming data from geographic to projected, choose a map projection centered where your data are located to minimize distortion. Use this tool to assign a projection to a data layer that does not have one (no .prj file) or fix an incorrect projection. You need to know the correct projection for your data: look at the metadata, the website where you got the data, etc. If you are looking for data from a specific location, search for a town/county/state/country GIS organization and contact them. Do this manually by picking a distinct point on your image and indicating where this point aligns with a data layer on your map. Once you click 'Update Georeferencing' the map projection information is permanently stored in .jgw and .xml files. The image will open in the proper location in a new ArcMap document, however other programs (such as QGIS) may not be able to read these projection files. This tutorial will guide you through how to change the display of your data in ArcMap, including colors, symbols, and re-categorizing the data to make a meaningful map. Test out various color schemes for your map. Click Export at the bottom of the map to download a color tool that can be used in ArcMap. about the coordinate system of the data layer not matching the data frame, you can change the coordinate system of the data frame: does not change the coordinate systems of the individual data layers. Rather, it changes how the data are displayed on the screen. You may see your data stretch and distort as you change the coordinate system of the data frame. Source.


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Last Modified: April 23, 2016 @ 3:07 am