Penn State Data Commons - Full Metadata

Abstract:

A land cover map of the Chesapeake Bay Watershed plus the non-watershed components of counties that intersect the Watershed. The map has 17 cover classses modified from the Anderson Level II system. Landsat remotely sensed data and additional thematic data bases were used to create the map. A decision-tree classification was used, together with ad hoc algorithms to improve local accuracies. Landsat 7 ETM+ data were acquired for three seasons. The spatial accuracy is nominally 30m, but accuracy increases rapidly at larger minimum mapping units and, as a general rule, the map should not be used below 1ha (100m x 100m) resolution. The map extends beyond the watershed but has not been validated outside the watershed boundary and the intersecting counties.

Purpose:

To map land cover of the entire Chesapeake Bay Watershed consistently for large area ecosystem research, land management and land use planning.

Supplemental_Information:

This data targets the following audience(s): scientists.

Currentness_Reference:

ground condition

Use_Constraints:

None

Attribute_Accuracy_Report:

Validated using comparison of land cover in independent validation sites with mapped land cover classes. 4,629,686 validation points, 775,540 excluding water. 98% accuracy with water sites (kappa = 0.92), 86% without water sites (kappa = 0.83).

Logical_Consistency_Report:

N/A

Completeness_Report:

No grid cells missing

Horizontal_Positional_Accuracy_Report:

Better than 0.5 pixel (15m)

Vertical_Positional_Accuracy_Report:

N/A

Source_Contribution:

Multispectral land surface reflectance data

Process_Description:

Landsat 7 ETM+ data acquired for 21 scenes for spring, summer and early winter. Data orthorectified, calibrated and converted to top of the atmosphere reflectance, cloud and cloud shadows removed, normalized to correct for topographic effects on incident solar radiation, and radiometrically normalized relative to overlapping data at scene edges. Corrected Landsat data plus selected digital data(e.g., elevation, road density) classified using multiple decision trees - a hierachical, monothetic, divisive statistical method. Final classes adjusted for user needs using postprocessing steps.

Process_Description:

Metadata imported.

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

ESRI

Entity_and_Attribute_Overview:

Landsat ETM+ satellite data
GDT Dynamap2000 street network file
USGS digital elevation
Land cover data from RESAC field studies, air photo interpretation and collaborator data sets.

Entity_and_Attribute_Detail_Citation:

Standard Landsat data acquired from USGS EDC
GDT Inc.

Address:

RESAC  Geography Department

Address:

University of Maryland

Distribution_Liability:

none provided

Address:

115 Land and Water building

Distribution_Liability:

The USER shall indemnify, save harmless, and, if requested, defend those parties involved with the development and distribution of this data, their officers, agents, and employees from and against any suits, claims, or actions for injury, death, or property damage arising out of the use of or any defect in the FILES or any accompanying documentation. Those parties involved with the development and distribution excluded any and all implied warranties, including warranties or merchantability and fitness for a particular purpose and makes no warranty or representation, either express or implied, with respect to the FILES or accompanying documentation, including its quality, performance, merchantability, or fitness for a particular purpose. The FILES and documentation are provided "as is" and the USER assumes the entire risk as to its quality and performance. Those parties involved with the development and distribution of this data will not be liable for any direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the FILES or any accompanying documentation.

Address:

RESAC  Geography Department

Address:

University of Maryland

Full Metadata

Chesapeake Bay Watershed land use/land cover v105