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Editing in ArcMap

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1Editing in ArcMap Workshop #9 Many times, the data that you need for your analysis will not be “ready-made” for you. In some cases, you might be the first person interested in some spatial feature that is found only in printed maps, or perhaps you are trying to determine how some “not yet built” feature might affect the landscape you are interested in. In these cases, you are likely to have to create your own features from scratch. Or, you might need to alter or add to already existing data that may not have been updated recently. If any of these are the case, you will need to be familiar with editing in ArcMap. This tutorial will walk you through the very basic skills you will need to proceed with editing in ArcMap. There are many ways to interact with data in the ArcMap Editing Environment, and this tutorial will introduce you to only the very simplest tools. Getting Ready for the Tutorial: 1. Browse to the Map Collection website at: http://www.library.yale.edu/maps 2. Under QUICK LINKS, follow the “Download GIS Workshop Materials.” 3. Scroll down to the “Editing in ArcGIS” workshop materials and click on the Data link to download the materials. 4. Download the Data file to an initials folder (a folder with your initials as the folder name) in the C:\Temp\ folder of your harddrive. 5. Unzip the contents of the file to the initials folder. Creating an Empty Shapefile 1. Browse into the resulting folder 09_Editing_in_ArcMap_Data and find the map document, New_Haven_Sanborn_Editing.mxd, and open it by double-clicking. 2. Click on the ArcCatalog Button to launch ArcCatalog. 3. In the TreeView of ArcCatalog, browse to the .\Data\Shapefile\ folder of the tutorial dataset.24. Right-click on the .\Shapefile\ folder and select >New>Shapefile, to open the Create New Shapefile Dialog Box. 5. Name the new shapefile Hydrants_New_Haven_1901. 6. Leave the Feature Type as Point. 7. Click on the “Edit…” button, under the Spatial Reference Description to open the Spatial Reference Properties Dialog. You will use the spatial reference from a shapefile in the tutorial dataset to reference this data. 8. Click on the Import Button to browse to the .\Data\Shapefile\ folder and select the Wall_York_Grove_High_New_Haven_1901 shapefile. 9. Click Add. 10. Click OK to accept the imported Spatial Reference Properties. 11. Click OK to create the new shapefile. Add Attribute Fields to Fire Hydrants Point Shapefile 1. In ArcCatalog, Right-Click on the new Hydrants_New_Haven_1901 shapefile and open the Properties Dialog. 2. Select the Fields Tab. 3. Click in the first blank Field Name cell to place the cursor. Name the field HYD_TYPE. 4. Click in the Data Type cell next to the new HYD_TYPE Field Name to activate the drop-down menu. Select Short Integer as the Data Type.35. Click OK to write the new field to the empty Hydrants_New_Haven_1901 shapefile. Drawing Features in an Empty Shapefile The Editing Toolbar 1. Return to ArcMap and use the Add Data Button to add the empty Hydrants_New_Haven_1901 shapefile to the map document. 2. Click on the Editor Toolbar Button to open the Editor Toolbar. Dock the toolbar somewhere convenient, if necessary. 3. Click on the Editor Button and select “Start Editing” to begin an editing session. 4. Make sure that the “Task:” is set to Create New Feature, and the “Target:” is set to Hydrants_New_Haven_1901. 5. Use the Zoom & Pan Tools to focus on the upper right corner of the scanned map image in the map document 6. Click on the Sketch Tool on the Editor Toolbar to enable it. 7. Click on the D.H. (Double Hydrant) symbol to place a point on it.48. Click on the Attributes Button to open the Editor Toolbars Attributes Window. 9. Place the cursor in the Value cell for your HYD_TYPE field. Place a value of 2 in the cell, since you have digitized a double-hydrant. 10. Repeat Steps 5-9 for the remainder of the hydrants in the extent of the Wall_York_Grove_High_New_Haven_1901 layer, until you have digitized points and edited the HYD_TYPE field for all of the hydrants (there are 6). Right-click on the layer in the Table of Contents and select “Zoom to Layer” to zoom to its extent. 11. When you have finished digitizing all 6 hydrants, click Editor>Save Edits on the Editor Toolbar. 12. Save your work. Creating New Polygon Features Create Printshop at 351 York Street 1. In the ”Target:” Dropdown on the Editor Toolbar, change the target layer to the Wall_York_Grove_High_New_Haven_1901 layer. 2. Select the Sketch Tool from the Editor Toolbar and place the first vertex of the new polygon by clicking once on any of the four corners of the Print Shop footprint. 3. Place each subsequent vertices (moving sequentially, clockwise or counter-clockwise) by clicking once5on each of the footprint corners. 4. When you have placed the fourth corner vertex, right-click anywhere in the map view and select “Finish Sketch.” 5. If you do not already have the Attributes Editor open, open it from the Attributes Button on the Editor Toolbar. 6. Use the values shown to the right to fill in the attributes for the Print Shop. 7. Select Editor>Save Edits on the Editor Toolbar to save the new feature and its attributes to the shapefile permanently. 8. Save your work. Deleting, Modifying, Splitting & Merging Features Deleting 246 Grove Street 1. In the Main Menu, go to View>Bookmarks>250 Grove. Note that there is a feature that does not correspond to a building footprint present in the reference image. 2. On the Editor Toolbar, change the “Task:” to “Modify Feature.” 3. Activate the Edit Tool . 4. Using the Edit Tool, click once in the “orphan” feature to select it. 5. Right-click in the selected feature and select “Delete.” 6. Select Editor>Save Edits on the Editor Toolbar. 7. Save Your Work.6 Split 250 Grove Street 1. On the Editor Toolbar, go to Editor>Snapping… to open the Snapping Environment Panel. 2. Check all three checkboxes, next to the Wall_York_Grove_High_New_Haven_1901 layer. 3. Close the Snapping Environment Panel. 4. Change the Editing “Task:” to “Cut Polygon Features.” 5. Activate the Editing Tool and use it to select the footprint polygon at 250 Grove Street. 6. Activate the Sketch Tool and hover it near the undigitized line in the footprint of 250 Grove


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