Notes for

Project 6PVA Pro 9000

Problem Definition

The PVA Pro 9000 is a software application to support the estimation of acreage from aerial photographs or maps of geographical regions. The program provides the following functions:

Open an aerial photo or map image.

Set the scale of the image (e.g. pixels per unit distance).

Permit the user to define a boundary around a region (e.g. a field).

Compute the area contained in the defined boundary.

Select a boundary for edit or deletion.

Save the Image and the associated boundaries.

this distance = 200 meters

user clicks on image to draw a polygonal boundary

program uses boundary points and scale factorto compute an estimate of the acreage of theenclosed area.

Image, scale, and polygons will be saved so that they canbe opened as a unit and edited.

Include options for opening image only or complete session