Next / Previous / Contents / TCC Help System / NM Tech homepage

1. Introduction

The Christmas Bird Count of the National Audubon Society is a unique resource for ornithological researchers: a continent-wide survey of early winter bird numbers going back to 1900. Each published census is a count of all the birds in a 15-mile-diameter circle on one day between mid-December and early January.

This document describes the implementation of a Web-based application to display a report showing the history of a given circle or combination of circles.

This system is built on top of a number of existing layers that are documented elsewhere.

Click here to generate reports using this system.