Senior Geographical Information System Consultant

Decca Recruiting

Full Time
Santa Clara, CA
Posted 11 months ago

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
  • Breaklines
  • Geometric errors of 9 ii. Z-values iii. Waterbodies not encompassed with breaklines iv. Drainage lines not flowing downstream
  • Missing breaklines for bridges.
  • Metadata
  • 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

Job Features

Salary RangeNot Specified

Apply Online