"Go" analysis of similarities and differences between various merged features (Union, merge, Append, dissolve) in ArcGIS

Turn from: Analysis of similarities and differences between various merged features (Union, merge, Append, dissolve) in ArcGIS

The merging of two feature classes into one feature in ArcGIS is union, dissolve, Append, merge, and so on, with tools in Arctoolbox, but functionally different:

Union: merges the input feature classes into the new feature class.
Graphics: Union can only merge feature classes of type polygon. When two feature classes are merged, the intersecting parts are processed to form multipart features individually, with options to allow gaps (gaps) or gaps to be allowed. If you choose not to allow a gap, the merged gap of the two feature classes will generate features.
Property sheet: There are three options for the Union Merge property sheet: All, No_fid, and Only_fid. All the attribute table fields of the two feature classes are placed in the order of the attribute tables of the output feature class, including the FID. Fields with the same name (except FID) are followed by a number in the field name (FID and feature class name). No_fid fields in the attribute table of the two feature classes are placed in the order of the attribute tables of the output feature class, except for the FID. Only_fid only the FID from the attribute table of the two feature classes into the attribute table of the output feature class, adding the feature class name to differentiate after the FID. Union does not do field mapping.

Merge : merges input feature classes, tables into new feature classes, tables.
You can combine generic property sheets, merge attributes, or attach properties!
For example: County polygon, only the name attribute, now needs to add his zip code, area code, population, area, code, and so on, and now collect this information, and put in a general attribute database such as access. Property sheets and graphic properties have a common name attribute field that can be joins together and then use the Merge tool to select the desired attribute field and create a new independent feature!

Graphics: Merge can merge feature classes and tables, such as points, lines, and polygons, but must be of the same type. Merge does not process features, it simply places features in a feature class, so the output feature classes may have overlapping or gaps.
Property sheet: When the merge process attribute table, the fields of the same name are synthesized one, and the fields of different names are added to the Output feature class attribute table in the original name and order, and the original FID is discarded. The merge can be field mapped.

append: merges the input feature classes, tables, raster images, and raster catalogs into an existing feature class, table, raster image, and raster catalog.
If the source data has the same field properties, you can use append to merge multiple shapefile files into one.
such as different levels of river Shapefile files can be combined in a shapefile, showing the topic can also be described separately.

When the schema type option is test, the feature class attribute table structure for the input and output must be identical, with the field name, type, and order must be exactly the same, which can be different when the schema type option is No_test.
Graphics: Append can combine feature classes and tables, raster imagery, and raster catalogs, such as points, lines, and polygons, but must be of the same type. Append does not process features, it simply places features in a feature class, so the output feature classes may have overlapping or gaps.
Property sheet: The attribute table of the same output feature class. fields in the Input feature class attribute table will be discarded if not in the Output feature class attribute table, but you can do field mapping to map a field of the input feature class to a field in the Output feature class.

D issolve: Multiple features can be dissolved into one element through the specified attributes (the same attribute value);
For example, the county can be dissolved into a city. Condition: The county element has the common City sign ~!
dissolve/////missing a different property that is not specified

Similarities and differences:merge, Union, append are merged, start, process, result, what is the difference?
Merge and Union are generally for "features" in a feature class, that is, to manipulate a subset of features.
A merge is an operation on a feature in the same feature class, and the original feature disappears after the operation is complete.
The Union is flexible enough to operate on features from different layers, and the new features are generated in the target layer
Append is typically used to merge multiple feature classes. For example, combine data from two provinces into one feature class.

"Go" analysis of similarities and differences between various merged features (Union, merge, Append, dissolve) in ArcGIS