3 What is the spatial extent of the map Geographic coordinate systems always

3 what is the spatial extent of the map geographic

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3. What is the spatial extent of the map? Geographic coordinate systems always contain 3 components: 1. A datum, which includes a spheroid 2. An angular unit of measure 3. A prime meridian Datum: specifies the spheroid that will be used to give the coordinate system its shape and historically composed of four components: 1. Spheroid 2. Origin 3. Azimuth 4. Orientation Angular Unit of Measure: usually degrees Prime meridian: defines a zero value for longitude NAD 1927 is defined by a local datum, with its origin in Meades Ranch, Kansas. NAD 1983 and WGS 1984 are defined by earth-centered datums Process for 3-parameter Data transformation: 1) Align origins 2) Rotate axes 3) Scale to fit Summary: A projected coordinate system assigns Cartesian coordinates on a flat surface and links those coordinates to a geographic coordinate system. In this exercise, we practiced working with coordinate and projection systems and completed 3 training courses on ESRI about it. There is a lot of good information in here about the different types, datums, geographic coordinate systems, and projections. Exercise 5: 2/12/18 Data Sets: OR_data.gdb Procedures: 1. Export map as pdf a. File -> export map -> make sure the specifications for file type are set to pdf
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2.Digitize a polygon a.Open the catalog and go to the layer you will be fixingb.Right click, point to new, and select Feature Classc.Name it and make sure polygon is selectedd.Select the coordinate system. Click next and accept the defaults until you finishe.Isolate selection of the layerf.Open the edit toolbar and open the snapping toolbarg.Select the straight segment tool on the edit toolbarh.Start by left clicking at a node of the polygoni.To complete the polygon, return to the starting point, right click, and select finish sketch3.Isolate a selectiona.Right click on layerb.Highlight selectionc.Click make this the only selectable featureCommand/Tool Location Function When/Why to use it Define projection Search in toolbox Assign projection a layer Change a coordinate system to align with another data layer Source Tab Layer properties dialogue box Provide information Help discover causes of misaligned data Neatline Under the inset ribbon Add a neatline Making map displays in layout view Legend Under the insert ribbon Add a legend Making map displays in layout view Title Under the insert ribbon Add a title Making a map display in layout view Scale Bar Under the insert ribbon Add a scale Making a map display in layout view North Arrow Under the insert ribbon Add a north arrow Making a map display in layout view Label features Right click on layer Adds labels Labeling features directly on a map instead of
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having to open the attribute table Construction Tools Create features button the editor toolbar Contains tools for digitizing Digitize Reshape tool Editor toolbar Move/add vertices and alter the shape When you have made an error in digitizing something Summary: This exercise was a lot more intense and helpful than the other ones so far. It was great practice that demanded we use all of the map elements we have learned about so far and gave us a chance to actually work with the data using the digitizing feature and trying to create our own professional looking maps.
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  • Winter '18
  • Lorenne Becker
  • Geographic coordinate system, Coordinate system, Raster graphics, data sets

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