Hello,

I have some polygon shapefiels.

Each of them are composed of more than one polygon.

I would like to ask how to get

1. the latitude of the north boundary of the northmost polygon in each shapefiles.

2. the latitude of the south boundary of the southmost polygon in each shapefiles.

Thanks.

Elaine

I have some polygon shapefiels.

Each of them are composed of more than one polygon.

I would like to ask how to get

1. the latitude of the north boundary of the northmost polygon in each shapefiles.

2. the latitude of the south boundary of the southmost polygon in each shapefiles.

Thanks.

Elaine

Here's a crazy idea. It will require an ArcInfo license. If you don't have an Info license, there may be another way around but I'd have to think about it.

1. Run the Minimum Bounding Geometry GP tool on your polygon shapefile.

Use the RECTANGLE_BY_AREA type and set the group option to ALL.

This will give you a single polygon which encompasses all of your polygons. Theoretically, the top and bottom of this polygon should be the numbers you're looking to obtain.

2. Run the Feature Vertices to Points GP tool on the output from step 1.

Use the point type of ALL.

3. Run the Add XY Coordinates GP tool on the output from step 2.

4. Run the Summary Statistics GP tool on the point shapefile which you just added XY coordinates to.

You will need to add the POINT_Y field twice to the "Statistics Field(s)" section. For the statistic type, choose "MIN" for one and "MAX" for the other.

You'll end up with a table that contains two fields, one containing the northern latitude of the extent of the shapefile and another containing the southern latitude of the extent of the shapefile.

Just a thought.