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I have to overlay 3 different layers called "Bacino Isonzo Perimetro", "Bacini Tributari Isonzo", and "Isonzo" in ArcMap. Layers'properties are shown below.

BACINO ISONZO PERIMETRO

Data Type:  File Geodatabase Feature Class 
Location:   C:\Users\Marco\Documents\ArcGIS\Default.gdb
Feature Class:  CATCHMENTS_Clip1_Dissolve1
Feature Type:   Simple
Geometry Type:  Polygon

Projected Coordinate System:    ETRS_1989_LAEA
Projection: Lambert_Azimuthal_Equal_Area
False_Easting:  4321000
False_Northing: 3210000
Central_Meridian:   10
scale_factor:   
Latitude_Of_Origin: 52
Linear Unit:    Meter

Geographic Coordinate System:   GCS_ETRS_1989
Datum:  D_ETRS_1989
Prime Meridian:     Greenwich
Angular Unit:   Degree

BACINI TRIBUTARI ISONZO

Data Type:  File Geodatabase Feature Class 
Location:   C:\Users\Marco\Documents\ArcGIS\Default.gdb
Feature Class:  CATCHMENTS_Clip1
Feature Type:   Simple
Geometry Type:  Polygon

Projected Coordinate System:    Sphere_Winkel_Tripel_NGS
Projection: Winkel_Tripel
False_Easting:  0
False_Northing: 0
Central_Meridian:   0
scale_factor:   
Latitude_Of_Origin: 50,467
Linear Unit:    Meter

Geographic Coordinate System:   GCS_Sphere
Datum:  D_Sphere
Prime Meridian:     Greenwich
Angular Unit:   Degree

ISONZO

Data Type:  File Geodatabase Feature Class 
Location:   C:\Users\Marco\Documents\ArcGIS\Default.gdb
Feature Class:  CORSI_ACQUALine_Clip
Feature Type:   Simple
Geometry Type:  Line

Projected Coordinate System:    Monte Mario / Italy zone 2
Projection: Transverse_Mercator
False_Easting:  2520000
False_Northing: 0
Central_Meridian:   15
scale_factor:   0,9996
Latitude_Of_Origin: 0
Linear Unit:    m

Geographic Coordinate System:   Monte Mario
Datum:  Monte Mario
Prime Meridian:     Greenwich
Angular Unit:   degree

The first and the third layers seem to be aligned but the second one is not aligned and I can see it only with Full Extent view. I tried to use some ArcToolBox tools to align them, but I have not solved my problem, please help me showing me step by step procedure, thank you very mutch. Marco

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4  
I would say that the projection of the second feature class is incorrect. Please see if this question might be of help: gis.stackexchange.com/questions/7839 Also. your three layers are in three different gcs + datums. It is possible that there might not be datum transformation for all three, which could cause the problem. –  Devdatta Tengshe Dec 27 '12 at 11:55
1  
try not to post many questions about the same subject (gis.stackexchange.com/questions/44797/…) –  A.R Dec 27 '12 at 12:04
    
Thank you very much. Other question is a misprint, sorry –  Mark Dec 27 '12 at 12:20
1  
I thought perhaps there was a datum/GCS issue, but if you can only see #2 at full extent (and it's very far offset from the other two layers), then @DevdattaTengshe is almost certainly correct that there's a problem with #2's coordinate system. If you set the data frame's coordsys to #1 or #2, do #1 and #2 line up? If so, then there could be a datum transformation issue. –  mkennedy Dec 28 '12 at 17:41
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