Editing 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 to launch ArcCatalog.

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3. In the TreeView of ArcCatalog, browse to the .\Data\Shapefile\ folder of the tutorial dataset.

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4. 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 dropdown menu. Select Short Integer as the Data Type.

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5. 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.

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8. 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 doublehydrant. 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 once 4

on 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

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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.

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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.” and use it to 5. Activate the Editing Tool select the footprint polygon at 250 Grove Street. and hover it 6. Activate the Sketch Tool near the undigitized line in the footprint of 250 Grove Street. Notice how the tool “sticks” to the lines and vertices of the feature as you come within the snapping tolerance of the line. 7. Use the Sketch Tool to create a new line that splits the feature between the two sections shown in the reference image. 8. When you have placed the second vertex of the line, right-click and select “Finish Sketch.” Note that the drawing “flashes” a little bit when you do this. ArcMap has just “Split” the polygon into two features with identical attributes. 9. Use the Editor Tool to select the smaller of the two polygons that you just

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created. 10. Open the Attributes Panel, if it is not already open, and change the values of the polygon as shown on above. 11. Go to Editor>Save Edits. 12. Save

your work.

Modify 351 York 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. In the Main Menu, go to View>Bookmarks>351 York. 5. Note that the digitized line at 351 York does not properly follow the footprint shown in the reference image. 6. Change the Editor “Task:” to “Modify Feature.” 7. Use the Editor Tool to select the feature at 351 York. 8. Place the cursor over the spot on the northern edge of the feature where there needs to be a new vertex (shown in the image above with a red star). 9. Right-click and select “Insert Vertex” to create a new vertex for this corner. 10. Hover over the northwest vertex (shown as a red square in the image above) until the pointer changes to a four arrowed box. Click-hold the vertex and drag it to the appropriate place (as shown at the right). 11. Click outside the feature to deselect it and apply the change.

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12. Go to Editor>Save Edits. 13. Save

your work.

Merge 352-355 York Street 1. On the Main Menu, go to View>Bookmarks>Office. 2. Change the Editor “Task:” to “Modify Feature,” and activate the Editor

Tool.

3. Hold down the shift key and select both polygons that make up the footprint of the building at 353355 York Street. 4. On the Editor Toolbar, select Editor>Merge. 5. You will be prompted to select the “feature with which other features will be merged.” This means that the resulting feature will retain the Attributes of the feature you select. Note that when you select one of the feature names in the list, its corresponding polygon shape flashes in the map document. Select the larger of the two polygons and click OK. The two polygons will merge into one. Note that we will not adjust the attributes in this case, but the field containing measurements of area, perimeter, etc… will no longer be valid and should be recalculated, if needed.

6. Go to Editor>Save Edits. 7. Save

your work.

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