Pennsylvania Spatial Data Access

Abstract:

Change in the District of Columbia’s tree canopy estimated from 2011 leaf-on imagery and 2006 leaf-on imagery in conjunction with 2008 leaf-off LiDAR. This layer consists of three classes of tree canopy: 1) no change, 2) loss, and 3) gain. No change indicates that the tree canopy has not changed substantially from 2006 to 2011. Loss indicates that tree canopy was removed from 2006 to 2011. Gain indicates that new tree canopy was established between 2006 and 2011.The method for producing this layer was based on the object fate analysis technique developed by Schopfer and Lang. The principal goal was to insure that estimates of tree canopy change were due to actual change and not due to differences in the 2006 and 2011 imagery. As such tree canopy mapping was done at the individual tree level. A combination of automated and manual techniques were employed using 2006 Quickbird imagery, 2008 LiDAR, and 2011 National Agricultural Imagery Program (NAIP) data. Extensive quality assurance and quality control methods were employed. This dataset has been independently reviewed by two separate organizations.

Purpose:

The purpose of this dataset is to provide an estimate of tree canopy change in the District of Columbia from 2006 to 2011.

Use_Constraints:

The publishers of this dataset do not provide any warranty of the item whatsoever, whether express, implied, or statutory, including, but not limited to, any warranty of merchantability or fitness for a particular purpose or any warranty that the contents of the item will be error-free.This dataset is distributed under the Creative Commons Share Alike 3.0 license. As such, you are free to share and adapt this work, but you transform, alter, or build upon this work you may distribute the resulting work only under the same or similar license.

Address:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Data_Set_Credit:

University of Vermont Spatial Analysis Laboratory

Logical_Consistency_Report:

Toplogy has been checked for overlaps.

Source_Contribution:

2006 leaf-on Quickbird satellite imagery.

Source_Contribution:

2008 leaf-off LiDAR data

Source_Contribution:

2011 leaf-on National Agricultural Imagery Program data.

Process_Description:

Automated feature extraction

Address:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Process_Description:

Quality assurance and quality control

Address:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Process_Description:

Topology check

Address:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Attribute_Definition:

Internal feature number.

Attribute_Definition_Source:

Esri

Attribute_Definition:

Feature geometry.

Attribute_Definition_Source:

ESRI

Attribute_Definition:

Area of feature in internal units squared.

Attribute_Definition_Source:

ESRI

Address:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Distribution_Liability:

This dataset is distributed under the Creative Commons Share Alike 3.0 license.  As such, you are free to share and adapt this work, but you transform, alter, or build upon this work you may distribute the resulting work only under the same or similar license.

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:

University of Vermont

Address:

81 Carrigan Drive

Address:

Aiekn Room 205

Tree Canopy Change, Washington DC, 2006 - 2011 (DRAFT)