The objective for this project is to compile a Digital Terrain Model (DTM) using LiDAR of the area from Lock 7 Lock 15 as shown on the attached map to aid in the understanding and management of the floodplain in this region.

The LiDAR data acquisition and processing will be performed by AAMHATCH Pty Ltd. Data acquisition is to take place in June 2007 using an Optech ALTM system. The raw data will then be processed and supplied as both thinned ground DTM (redundant ground points removed) in ESRI shapefile format and as a 1m grid in ESRI gridfile format. Contours at 0.5m will also be supplied in ESRI shapefile vector format.

Process

The major technical processes to be employed in this LIDAR solution are summarised below:

• LIDAR data will be acquired using an Optech ALTM system.

• The emitted point spacing will be satisfactory for defining all relevant changes of grade.

• In order to classify the data into “ground” and “non-ground” strikes an automatic classification will be applied, followed by a manual checking and editing.

• Contours will be generated subsequent to data classification and calibration.

• Data will be provided in MGA coordinates relative to published base station coordinates.

• DTM accuracies will be checked and reported on by comparisons with field calibration points and available data from previous surveys.

• Data will be supplied as both thinned ground DTM (redundant ground points removed) in ESRI shapefile format and as a 1m grid in ESRI gridfile format. Contours at 0.5m will also be supplied in ESRI shapefile vector format.

• All data will be accompanied by corresponding metadata documentation.

Specifications

• Vertical point accuracy of 0.15m (at one sigma on clear ground)

Total Project Area

The total project covers an area of over 1410 sq km

The objective for this project is to compile a Digital Terrain Model (DTM) using LiDAR of the area from Lock 7 Lock 15 as shown on the attached map to aid in the understanding and management of the floodplain in this region.

The LiDAR data acquisition and processing will be performed by AAMHATCH Pty Ltd. Data acquisition is to take place in June 2007 using an Optech ALTM system. The raw data will then be processed and supplied as both thinned ground DTM (redundant ground points removed) in ESRI shapefile format and as a 1m grid in ESRI gridfile format. Contours at 0.5m will also be supplied in ESRI shapefile vector format.

Process

The major technical processes to be employed in this LIDAR solution are summarised below:

• LIDAR data will be acquired using an Optech ALTM system.

• The emitted point spacing will be satisfactory for defining all relevant changes of grade.

• In order to classify the data into “ground” and “non-ground” strikes an automatic classification will be applied, followed by a manual checking and editing.

• Contours will be generated subsequent to data classification and calibration.

• Data will be provided in MGA coordinates relative to published base station coordinates.

• DTM accuracies will be checked and reported on by comparisons with field calibration points and available data from previous surveys.

• Data will be supplied as both thinned ground DTM (redundant ground points removed) in ESRI shapefile format and as a 1m grid in ESRI gridfile format. Contours at 0.5m will also be supplied in ESRI shapefile vector format.

• All data will be accompanied by corresponding metadata documentation.

Specifications

• Vertical point accuracy of 0.15m (at one sigma on clear ground)

Total Project Area

The total project covers an area of over 1410 sq km