I am very new to arcGIS and so apologise if this is a really simple question, but it has had me (and what I can find on the internet beat for 2 days now.
I am trying to build a series of layers of data in arcGIS 9.3.1 for a river catchment in Leicestershire, using data from several sources. All data covers at least the area of interest.
I have maps using British_National_Grid and NAD_1983_Albers as the projected co-ordinate system. When projected together one British National Grid layer doesn't all appear with the others. The Alders layers match the majority of the National Grid layers.
As far as I can tell the National Grid layers data (see below) is the same for all.
Data Type: Shapefile Feature Class Shapefile: C:\luke-work\Analysis 2 data\aquatic landscapes\AquaticLandscapes.shp Geometry Type: Polygon
Projected Coordinate System: British_National_Grid Projection: Transverse_Mercator False_Easting: 400000.00000000 False_Northing: -100000.00000000 Central_Meridian: -2.00000000 Scale_Factor: 0.99960127 Latitude_Of_Origin: 49.00000000 Linear Unit: Meter
Geographic Coordinate System: GCS_OSGB_1936 Datum: D_OSGB_1936 Prime Meridian: Greenwich Angular Unit: Degree
The other two projections data are
Data Type: Personal Geodatabase Feature Class Location: C:\luke-work\Analysis 2 data\catchment\catchment.mdb Feature Dataset: Layers Feature Class: DrainageLine Feature Type: Simple Geometry Type: Line
Projected Coordinate System: NAD_1983_Albers Projection: Albers False_Easting: 1500000.00000000 False_Northing: 6000000.00000000 Central_Meridian: -100.00000000 Standard_Parallel_1: 27.50000000 Standard_Parallel_2: 35.00000000 Latitude_Of_Origin: 18.00000000 Linear Unit: Meter
Geographic Coordinate System: GCS_North_American_1983 Datum: D_North_American_1983 Prime Meridian: Greenwich Angular Unit: Degree
Any suggestions on what I am doing wrong would be greatly appreciated.