SAMPLES
Impervious Surface Delineation using LiDAR Intensity Data and Orthophotos
One of i-TEN Associates first projects was to provide Clackamas County Oregon, Water Environment Services (WES), detailed Impervious Surface Delineation using their existing ½' pixel orthophotos and LiDAR Intensity data. The project covered a 56 square mile area of which approximately 33 sq. miles were urbanized and 23 sq. miles were rural. Some benefits of this approach for WES included:
- Faster than field methods
- Eliminates on-site property access
- Collection of data under tree canopy
- Data enhancement and integration with legacy data
- Aid in analysis of future urbanization
- Refine surface runoff billing
- More accurate hydrology and water quality modeling
A paper entitled “Using LiDAR for Surface Water Management and Impervious Surface Delineation” was presented in October of 2005 at both the National URISA conference held in Kansas City, MO and the ASPRS - Pecora-16 Symposium held in Sioux Falls, SD., which describes this project in detail
For a copy of the above paper please contact: marcus.glass@i10assoc.com
GIS Pavement Management Application
Another project completed was to link a county's existing Pavement Management System (PMS) database with ArcGIS 8.3cGIS. Application was developed using ArcObjects, ArcGIS 8.3 and Access database. This application has user interface - user can choose from any desired queries and get the result graphically in ArcGIS.
The second task of this project was to provide up to five standard queries producing thematic GIS maps that graphically illustrate results of pavement management analysis. For example, one map may show the present pavement condition and another map may show conditions in five years based upon a set of assumptions. This was to provide the following standard queries:
- Functional Class Network
- PCI Range Network
- Maintenance Treatment History
- Needs Sections Selected for Treatment
- Scenario Sections Selected for Treatment
All data analysis is to be performed within MTC's PMS. GIS will be used solely as a mapping tool to display the results.
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