This page last changed on Jul 03, 2006 by cholmes.
This is a multistep process.
- Loading TIGER basedata and QA/QC
- writes the TIGER data to a PostGIS database
- Loading TIGER polygons and QA/QC
- builds the simple TIGER polygons and writes them to the PostGIS database
- Loading TIGER landmarks
- creates the polygon_landmarks and point_landmarks dataset
- Loading TIGER water
- creates the water_polygon, water_line, and water_shoreline datasets
- Loading TIGER roads
- creates the TIGER roads and railroads datasets
- Loading TIGER roads major
- creates the TIGER Interstate/US Highway/State Highway/Major Roads (including generalizations)
- Loading TIGER high-level polygon
- creates the TIGER high level polygon datasets (state polygons, county polygon, zipcode polygons, zipcode+4 polygons, economic polygons, cenus polygons, etc...)
- Loading TIGER Geocoder
- setup a simple WFS-R that does TIGER-based geocoding (geocoder.us)
| More Info about TIGER
The offical TIGER 2005fe manual is attached here. This 350 page .pdf goes into great detail about the TIGER dataset. |
| Did you know?
The TIGER 2005fe dataset contains:
count |
type |
dataset name |
53,235,019 |
lines |
completechain |
15,941,828 |
polygons |
pip,poly2 |
310,275 |
area (polygon) landmarks |
poly_landmarks |
264,253 |
point landmarks (57,070 named) |
point_landmarks |
1,667,674 |
water polygons |
water_polygon |
7,880,932 |
(river) lines |
water_lines |
2,593,665 |
shoreline lines |
water_shorelines |
35,809,110 |
road lines |
roads |
788,487 |
railroad lines |
railroads |
|
| Projection
We assume that the entire TIGER dataset is in lat/long NAD83. In actual fact, its a bit more complex than that:
From the TIGER manual:
For the 48 contiguous states, the District of Columbia, Alaska, Puerto Rico,
and the Virgin Islands, the coordinates in the 1995 and later versions of the
TIGER/Line files are in the North American Datum of 1983 (NAD83). For
Hawaii and the Pacific Island Areas, the Census Bureau used a variety of
sources for building the original digital file in the late 1980s. Neither the
specific identities of each of these sources nor their datums were recorded. |
|