Introduction

Objectives

Methodology

Analysis

Error Issues

Results

General:

  Each data set is a 1:250,000 map sheet databases have to be defined accordingly.

The edge pixels are centered on the parallels or meridians, so that when databases are defined, minimums and maximums have to be calculated acccordingly.

  Format:

  The data sets are all 4 byte real (32 bit) data.

There ares no headers on the files.

  Size and resolution:

  Each data set covers 1 degree of latitude and 2 degrees of longitude.

Data sets north of 50 degrees are 1201 pixels by 1201 lines. This results in a cell size of 3 arc secs in latitude and 6 arc seconds in longitude.

Data sets south of 50 degs are 2401 pixls by 1201 lines. This results in a cell size of 3 arc secs in latitude and 3 arc secs in longitude.