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Land Area Table
Filename
{covername}.LAT
Description
The Land Area Table (LAT) contains attributes of the polygon, and attributes which apply to the entire landscape represented by that polygon. All values are in hectares.
Contents
|
Field |
Name |
Width |
Type |
Description |
|
1 |
7 |
I |
(relate key) |
|
|
2 |
8 |
I |
(area applicable to the PAT) |
|
|
3 |
8 |
I |
(area of the entire polygon) |
|
|
4 |
8 |
I |
(area of total water: fresh and ocean) |
|
|
5 |
8 |
I |
(area of fresh water) |
|
|
6 |
8 |
I |
(area of ocean water) |
Relationships
- A record in this file is unique with respect to SL.
- The SL field is used to relate to the PAT.
How the Land Area Table was populated
Area values for the SLC polygons were calculated using the HYDRO coverage. When unioned with the SLC coverage, it provides land, fresh water and ocean water values for each landscape polygon.
Procedure
- projects SLC coverage into Lambert Azimuthal Equal-Area projection
- calculates polygon areas in hectares
- summarizes intersection of ocean, water and land areas to populate the Land Area Table (LAT)
Background
The Land Area Table was developed to simplify the calculation of land and water areas for the SLC polygons, and remove ambiguities in the way water was represented in previous versions. This table was derived from the SLC and HYDRO coverages.
References
Sebert, L.M. and M.R. Munro. 1972. Dimensions and areas of maps of the National Topographic System of Canada. Technical report no 72-1. Surveys and Mapping Branch, Department of Energy Mines and Resources, Ottawa, Ontario. Unpublished Manuscript.
