|
II.
Land Use
A.
General Land Use Data
Section
Navigation
1. Land Use Data Sources
2.
Hybrid
Land
Use
3. Land Use Change
4. Land Use Change Impacts
1.
Land Use Data Sources
A number of land use layers currently exist within the
Darby Watershed ranging in age from 1992 to 2001.
The creation of accurate land use data is both time consuming and
difficult. Five different land use
layers currently exist for the watershed. The
following figure summarizes the variety of land use data layers that currently
exist for the Darby Watershed.
|
Figure
15: Land Use Data Sources
|
|
Name
|
Comment
|
|
1992-94
National
Land
Cover Dataset
-
U.S.
Geological Survey (USGS)
|
Most
detailed land use data.
21
Land Use classifications
|
|
1994
Land Cover - ODNR
Division
of Real Estate and Land Management
|
Statewide
Dataset
7
Land use classifications
|
|
1997
Forest Cover -
Ohio
EPA
Division
of Surface Water - Modeling Group
|
Created
to analyze forest cover types and percents
4
Forest
Cover Types
|
|
1997
Land Cover - The
Ohio
State
University
Department
of City and Regional Planning
|
Missing
400 acres near Circleville
13
Land use classifications
|
|
1999
Land Cover - The
Ohio
State
University
Department
of City and Regional Planning
|
Least
Detailed data
6
Land Use classifications
|
|
2001
Land Use -
Cincinnati
University
Geography
Department
|
In
progress through contract with OEPA Only
‘Urban’ classification complete
|
|
Hybrid
Land
Use -
Ohio
EPA
Division
of Surface Water - Modeling Group
|
USGS,
Forest Cover, and
Cincinnati
‘Urban’ data.
18
Land use classifications
|
Each of the above datasets was collected through remote
sensing and the use of a digital image processor, the
Landsat Thematic Mapper.
The Thematic Mapper collected electromagnetic radiation reflected from
the earth’s surface in 30 meter by 30 meter grids.
Through a computer analysis each grid is classified into a general land
cover category. A certain amount of
error is assumed when classifying land use in this manner because a 30 meter by
30 meter area, though small, may have overlapping land uses.
When this occurs that 30 meter by 30 meter cell must be analyzed through
other methods to determine the correct classification or labeled as
unclassified. In the case of the
1997 land use, approximately 400 acres were labeled as unclassified and for this
analysis were removed from any calculations or maps.
Section
Navigation
1. Land Use Data Sources
2.
Hybrid
Land
Use
3. Land Use Change
4. Land Use Change Impacts
To get to the Hybrid Landuse section please use above link.
Next will take you to the next section.
 
Back to
Table of Contents | 
