Why are my polygons automatically simplified/generalised when merging them in ArcMap 10.2?

How do I merge polygons in Arcmap?

Note:

1. Click the Edit tool. on the Editor toolbar.
2. Click the features you want to merge. The features must be from the same layer.
3. Click the Editor menu and click Merge.
4. Click the feature that the features will be merged into and will supply the attributes for the merged feature.
5. Click OK.

How do I merge overlapping polygons in ArcGIS?

Merge existing features

1. On the Edit tab, in the Features group, click Modify .
2. Expand Construct and click Merge .
3. Click the Existing Feature tab.
4. Click Select.
5. In the pane, add or remove features from the selection.
6. Configure the attributes fields and field values for the merged feature.
7. Click Merge.

How do you merge polygons?

Procedure

1. Display the polygon coverage to edit in Edit Tools.
2. On the Edit Polygons menu, click Merge.
3. Select two adjacent polygons. The new polygon has the attributes of the last polygon selected.

How do I merge shapefiles in Arcmap?

Merging Shapefiles in ArcGIS Desktop

1. Add two or more shapefiles in ArcGIS Desktop.
2. Select Geoprocessing.
3. Select Merge.
4. See Merge Tool screen.
5. Add the two or more shapefiles in Input Datasets.
6. Save the Output Dataset.
7. Name the Output shapefile.
8. Press OK.

What is the difference between merge union and dissolve?

How is the Merge Tool different from the Dissolve Tool? The Merge Tool puts all the items from multiple datasets into a single dataset. But it maintains the boundaries between features. This is different from the Dissolve Tool, which melts boundaries from one or more datasets into a common border.
 

What is the difference between merge and union in ArcGIS?

There are two ways to combine existing features and create a new feature in ArcMap: Merge and Union. Merge combines two or more features from the same layer into one. Union creates a new feature from two or more selected features of the same geometry type.
 

How do you fix overlapping polygons?

Removing overlaps from existing polygons

1. Select the polygon feature whose border you want to maintain. The other polygon will be clipped back to match it.
2. Click the Editor menu and click Clip.
3. Set the buffer distance to 0 and choose to discard the area that intersects.
4. Click OK.

How do you know if a polygon is overlapping?

Start ArcMap. On the main menu, click Customize > Toolbars > Data Reviewer. Click the Select Data Check drop-down arrow on the Data Reviewer toolbar, click the plus sign (+) next to Feature on Feature Checks, then click Polygon Overlap/Gap is Sliver Check.

What is spatial join?

A spatial join involves matching rows from the Join Features to the Target Features based on their relative spatial locations. By default, all attributes of the join features are appended to attributes of the target features and copied over to the output feature class.

How do I merge two images in ArcMap?

To use this function, you need to open the attribute table and select the rows in the table representing one image, then right-click the Footprint layer and click Selection > Merge Selected Items. The selected items will be converted from individual items into one new item (row) in the mosaic dataset’s attribute table.

What does the merge tool do in ArcMap?

Combines multiple input datasets into a single, new output dataset. This tool can combine point, line, or polygon feature classes or tables.

How do I merge multiple layers in ArcMap?

In the Manage Data group, click Merge. The Geoprocessing pane appears with the parameters for the Merge tool. This tool combines multiple input layers into a single, new output layer.