Project summary – A detailed survey of a square mile property was required to perform environmental remediation followed by an Engineering re-design from an abandoned manufacturing site to modern residential & retail development property.
Company: NV5 / Parsons
Services: Aerial imagery, LiDAR & photogrammetric 3-D planimetric mapping
Date Completed: October 2015
Spatial Intel assisted our client with developing a specification that would leverage the combined efficiencies of airborne and ground based surveys to support an engineering level as-built of the designated property. Determining the level of detail (features / terrain) and accuracy (H/V) required to support in-house CADD & GIS planning / reporting / design was first established. From there required aerial imagery resolution and point spacing of LiDAR were chosen at 4-inch color stereo and 6 points per square meter respectively were established to support delivery of ortho-rectified imagery mosaic’s, bare-earth DTM including break-lines for terrain modelling along with stereo photogrammetry compilation of planimetric feature mapping (down to the paint stripe level of detail).
We struggled a bit to match the aerial data with an existing “localized project coordinate system” for the project, however we did create a solution. The Engineering effort will be completed over the winter months within the confines of a warm office.
(Aerial Photogrammetry and Consulting)
A new client was provided the name of Spatial Intel to assist in evaluating a current bid for airborne LiDAR and digital imagery and provide added assistance in creating a specification to facilitate additional bids and ensure suitable data to support location and design support of a compressor station and other facilities. The project initially encompassed 35 square miles located in Colorado, was later increased to 45 square miles and required the following as a minimum:
Accurate DTM (mass-points and break lines) to support generation of 2-foot contours accurate to one quarter the interval on spots elevations.
High resolution aerial imagery ortho-rectified to the derived DTM, mosaicked, color balanced and tiled to manageable file sizes.
Coordinate with client field crews to place ground control to support orthorectification, detailed planimetrics (of likely candidate sites for design consideration) and independent check points for H/V accuracy validation.
Involve client survey staff in base station operation to support ABGPS and IMU positional control supplementation technology.
Forty-five day turn-around time.
Spatial Intel’s proposal for services resulted in a 55% cost savings over the previous bid received by the client and subsequently awarded the project to map 45 square miles using state of the art Zeiss DMC imaging technology. We proved a highly accurate DTM surface model, planimetrics and 6-inch (and 2-foot re-sampled) color orthorectified imagery. We recommended extending the photography limits from 35 to 45 square miles while in the area to facilitate mapping of expansion as a later date.
In addition to the airborne remote sensing services Spatial Intel assisted in the following disciplines:
Recommend sub surface utility locates technology, pre-qualify contractors and summarize scope of work and provide directly to our client. Those services were provided at no additional cost to our client.
Evaluated hyper-spectral and multi-spectral imaging technology and feature classification tools to assist the potential for land use classification mapping and change analysis to support environmental impact monitoring.
Assisted in client education on how to ingest and manipulate the deliverables to maximize value.
Spatial Intel performed and independent QC of all data and rejected the initial imagery. The imagery was re-captured and the project was completed per the initially agreed upon schedule without any delays.