Skills and Experiences:
The consultant must have minimum 5 years of experience in the processing and quality control of Lidar data. The consultant must also be familiar with the use cases of Lidar and Lidar derived products for GIS; and Esri ArcGIS software suite (e.g., ArcGIS Pro) where the County employees use the Lidar data. Certificate: The individuals who possess the following certificates are preferred: The American Society for Photogrammetry and Remote Sensing (ASPRS) Certified Mapping Scientists, Lidar (CMS, Lidar) OR The American Society for Photogrammetry and Remote Sensing (ASPRS) Certified Lidar Technologist (CLT) Education: The individuals who possess bachelor’s degree or higher in the following fields are preferred: Engineering, Geography, Environmental Science, or related fields. Scope:
- Pilot project area review – Estimated duration four weeks. The Pilot Report notes inconsistencies between the Lidar Base Specification and the pilot data delivery.
- The pilot area data to ensure that the delivered data products meet the QL1(Quality Level 1) requirements.
- The pilot data area is expected to be approximately 3 square miles.
- Full LiDAR data review – Estimated duration ten weeks. After County receive the full data, consultant will review the following LiDAR related products/deliverables:
- LiDAR Accuracy Report
- Classified LiDAR Point Cloud File (.LAS format)
- Bare-Earth DEM (Digital Elevation Model) raster files in GeoTiff format
- Hydro-flattening Breaklines in shapefile or file geodatabase format as PolylineZ and PolygonZ feature class, as appropriate.
- Hydro-flattened Bare-Earth DTM (Digital Terrain Model) in GeoTiff format
- First-Return Intensity Rasters in GeoTiff format
- First-Return Digital Surface Model in GeoTiff format
- FGDC Compliant Metadata
- Tile index either in .SHP or .GDB format
- The results of the full LiDAR data review process in Step 2 must be documented and delivered as a LiDAR Quality Report (see “USGS and County LiDAR QAQC report.pdf” as a sample report) that includes the following:
- Documentation for the QA/QC methodology
- Correctly georeferenced in the County specified projection
- List of incorrect classifications of points
- Classified Point Cloud
- Corrupt files ii. Tiles with no data iii. Incorrect GPS time stamp iv. Missing data overlap
- Point density, pulse density, las file statistics, incorrect classification of points, extract header properties. vi. Classification of points required by applicable Lidar Base Specification. vii. Spatial reference system
- DEM (Digital Elevation Model)
- Spatial and geometric accuracy (including breaklines) ii. Breaklines enforcement iii. Incomplete flattening iv. Structure
- Spikes vi. Missing hydro treatment
- Geometric errors of 9 ii. Z-values iii. Waterbodies not encompassed with breaklines iv. Drainage lines not flowing downstream
- Missing breaklines for bridges.
- Must include calibration, collection, and processing methods, are reviewed for accurate information. ii. FGDC compliant XML Metadata
- Status update meetings: County expects to have weekly to bi-weekly status update meetings. Frequency will be adjusted as needed and determined by the County.
- Two (2) training sessions with County staff to explain their QA/QC methodology and LiDAR Quality Report. Training must accompany with the documentation.
- All the meetings and work will be performed remotely.
- High-level estimated project timeline is defined as below
|Salary Range||Not Specified|